The high-performance polymer polybenzimidazole is produced from isophthalic acid. Import Export Code (IEC) APXPP***** GST Number. Amoco produced the first commercial purified isophthalic acid (PIA) in 1985 and the PTA unit was converted to full time PIA in 1992. InChI=1S/C8H6O4/c9-7(10)5-2-1-3-6(4-5)8(11)12/h1-4H,(H,9,10)(H,11,12), InChI=1/C8H6O4/c9-7(10)5-2-1-3-6(4-5)8(11)12/h1-4H,(H,9,10)(H,11,12), Except where otherwise noted, data are given for materials in their. CAS No. Purified Isophthalic Acid (PIA) is an organic compound. Pure isophthalic acid production in Singapore reached the highest output since the plant came on stream in December 1998. lonza.com Die Auslastung unserer Anlage für Isophthalsäure in Singapur, die im Dezember 1998 in Betrieb genommen wurde, war hoch. Total Number of Employees. Not applicable as substance is not classified. The main industrial uses of purified isophthalic acid (PIA) are for the production of polyethylene terephthalate (PET) resin and for the production of unsaturated polyester resin (UPR) and other types of coating resins. Note: reference 2 refers to the ortho isomer. Accurate cites for the meta isomer not available. This colorless solid is an isomer of phthalic acid and terephthalic acid. Purified Isophthalic Acid (PIA) is produced using FHR’s proprietary process where metaxylene is oxidized to isophthalic acid which is further purified by hydrogenation and water recrystallization. Delivery form. Isophthalic acid is an organic compound with the formula C6H4(CO2H)2. Purified Isophthalic Acid (PIA) Cas: 121-91-5 Isophthalic Acid is an organic compound with the molecular formula C 8 H 6 O 4. Global Purified Isophthalic Acid (PIA)? In September 2018, Ineos, the chemical company, signed an agreement to acquire Flint Hills Resources’ intermediates business that produces trimellitic anhydride, purified isophthalic acid and maleic anhydride in Joliet. Read about company. Upto 10 People. Relic Chemicals - Offering Purified Isophthalic Acid, Grade: Industrial, Packaging Size: 25 Kg at Rs 90/kg in Mumbai, Maharashtra. 1000 Kilograms (Min. This colorless solid is an isomer of phthalic acid and terephthalic acid. PIA, Purified Isophthalic acid is produced starting from meta-xylene using oxygen, in the presence of a catalyst. It also arises by fusing potassium meta-sulfobenzoate, or meta-bromobenzoate with potassium formate (terephthalic acid is also formed in the last case). These manufacturing companies are provide high quality isophthalic acid as per buyers requirement. Isophthalic acid (1,3-benzenecarboxylic acid) is the meta form of phthalic acid. and Nachod, F.C., Ullmann's Encyclopedia of Industrial Chemistry, "Lotte Chemical to invest $3.2mn to beef up meta-xylene and polycarbonate production", https://en.wikipedia.org/w/index.php?title=Isophthalic_acid&oldid=987864337, Pages using collapsible list with both background and text-align in titlestyle, Articles containing unverified chemical infoboxes, Creative Commons Attribution-ShareAlike License, This page was last edited on 9 November 2020, at 18:16. Isophthalic acid EC Number: 204-506-4 EC Name: Isophthalic acid CAS Number: 121-91-5 Molecular formula: C8H6O4 IUPAC Name: benzene-1,3-dicarboxylic acid Nature of Business. [4] Üblicherweise wird sie in Form eines farblosen, rieselfähigen Pulvers zur Herstellung von gesättigten Polyestern verwendet. 2020 to 2027. Pap. 100-21-0. Purified Isophthalic Acid (PIA) market competitive landscape provides details and data information by players. Purified Isophthalic Acid PIA – purified isophthalic acid – is a difunctional aromatic acid. Acid Trimellitic. Mixed with terephthalic acid, isophthalic acid is used in the production of PET resins for drink plastic bottles and food packaging. It’s a colourless solid and it’s an isomer of phthalic acid and terephthalic acid. Der Name der Säure leitet sich von Terpentinöl, durch dessen Oxidation sie erstmals dargestellt wurde, sowie von Phthalsäure, zu der sie isomer ist, ab. Isophthalic acid is an aromatic dicarboxylic acid industrially produced by the oxidation of m-xylene. Acid Purified Terephthalic. The 1990s also saw the expansion of both PIA and TMA capacities, the addition of anaerobic waste water treatment facility, and the addition of a butane pipeline to eliminate the trucking of butane to the MAN unit. Isophthalic acid is used as a raw material in the production of polyesters. Uvitic acid, 5-methylisophthalic acid, is obtained by oxidizing mesitylene or by condensing pyroracemic acid with baryta water. Anhydride Talloil Fatty Acid Talloil Destilled Heat Transfer Fluids Fumaric Acid Purified Terephthalic Acid. Physikalische Eigenschaften. Terephthalsäure oder para-Phthalsäure ist eine organisch-chemische Verbindung und gehört zu den aromatischen Dicarbonsäuren (Benzoldicarbonsäuren). Purified Isophthalic Acid (PIA) Market 2020 Global Outlook, Research, Trends and Forecast to 2025. INEOS Joliet Manufactures Purified Isophthalic Acid (PIA), Trimellitic Anhydride (TMA) And Maleic Anhydride (MAN), Produces high molecular weight polymers for hardness, flexibility, weatherability, and fast cure in waterborne, powder, and coil coatings, Enhances hydrolytic stability to improve the shelf life of waterborne coatings, Decreases dry times for high solids and traditional solvent-borne coatings, Provides clear bottles in a range of shapes and sizes and thicker preforms for returnable/refillable containers, Broadens processing window that reduces cycle time and lowers energy requirements, Improves taste in bottled water without the unpleasant flavor of acetaldehyde, Reduces permeability to carbon dioxide and oxygen, keeping beverages carbonated and flavorful longer, Provides outstanding resistance to various acids, solvents, and other chemicals, Offers an excellent combination of moderate cost and high performance often matching that of higher cost, corrosion resistant polymers including vinyl esters and bisphenol A polyesters for many applications, Has demonstrated exceptional performance in products as diverse as in-situ pipe remediation, gasoline storage tanks, chemical storage tanks, ladder rails and industrial gratings, protective coatings for watercraft, structural automotive parts and boat hulls, and functional and decorative solid surfaces, Presents ease of synthesis and fabrication in pultrusion, sheet molding compound (SMC), bulk molding compound (BMC), hand lay-up and spray-up, castings, injection molding, resin transfer molding (RTM), reaction injection molding (RIM), centrifugal casting, and filament winding, Provides a chemical platform for making thermal and oxidative stable aramid fibers, polyester elastomers, oil additives, adhesives, X-ray contrast agents, and fiber dye enhancers. Compare. The world's largest producer of isophthalic acid is Lotte Chemical Corporation.[3]. Purified Isophthalic Acid. UK. Isophthalic acid is one of three isomers of benzenedicarboxylic acid, the others being phthalic acid and terephthalic acid. Headquarters: 38 Hans Crescent. Purified Isophthalic Acid Ipa picture from ZHE JIANG MING RI HESHUN NEW MATERIALS TECHNOLOGY CO., LTD. view photo of Pia, Ipa, Isophthalic Acid.Contact China Suppliers for More Products and Price. Isophthalic acid is an organic compound with the formula C6H4(CO2H)2. The resulting white, crystalline powder is a versatile, difunctional aromatic acid (1,3-benzenedicarboxylic acid) with a typical acid number of 675 ± 2 mg KOH/g. INDIA For information in the INDIA, call: Tel: +91 - 22 - 2275 5555 / 6184 0000, Fax: +91 - 22 - 2275 5556 / 6184 0001 Section 2 - Composition, … The white, free-flowing crystalline powder is available in bulk and a variety of packaging sizes. Phys. It improves the property balance for coating resins and enhances clarity of PET-bottle grade resins. [ all data ] Notes Viele übersetzte Beispielsätze mit "purified isophthalic acid" – Deutsch-Englisch Wörterbuch und Suchmaschine für Millionen von Deutsch-Übersetzungen. 50 Lakh. Market Overview. Compare. Legal Status of Firm. Isophthalic acid is also used in formulations for adhesives, inks, wire enamels, … market report has various facts and statistics assuming the future predictions of the upcoming market participants. Nearly pure isophthalic acid has a purity of >99.8%. Isophthalsäure wird durch Oxidation von meta-Xylol mit Luftsauerstoff hergestellt.. Verwendung. They are also useful in applications such as gardening, the pharmaceutical industry, and the food industry too. Add to Favorites PTA--purified terephthalic acid 100-21-0 Suppliers. Isophthalic acid is an organic compound with the formula C6H4(CO2H)2. This is an isomer of Phthalic acid and Terephthalic acid. The intelligence report prepared contains details on the leading players of the Global Purified Isophthalic Acid (PIA) Market, along with various depending aspects related and associated with the market. 100% (1/1) 1,2-benzenedicarboxylic acid benzene-1,2-dicarboxylic acid orthophthalic acid. PIA – purified isophthalic acid – is a difunctional aromatic acid. Need to know more? In addition, it offers business security taking into account sales, profit, market volume, demand and market supply ratio. Purified Isophthalic Acid Industrial chemical Not applicable as substance is not classified. (Tokyo), 1939, 36, 449-457. This material is called purified isophthalic acid or PIA. Aromatic dicarboxylic acids are used as precursors (in form of acyl chlorides) to commercially important polymers, e.g. US $1450 / Kilogram. Chem. K… Powder. Add to Favorites 1/6. Find outstanding quality Order) 11 YRS Yangzhou Yangtai Chemical Co., Ltd. Site designed and developed by The MTM Agency. Synonym: Benzene- 1,3- dicarboxylic acid. Get contact details and address | ID: 22101375155 Contact Supplier . The product is used as an intermediate in the production of unsaturated polyester resins, followed by polyester and alkyd resins (mainly for surface coatings) and inks, reinforced plastics and packaging applications. The main industrial uses of purified isophthalic acid (PIA) are for the production of polyethylene terephthalate (PET) resin and for the production of unsaturated polyester resin (UPR) and other types of coating resins. US $450.00-$1000 / Metric Ton. Annual Turnover. Res. purified isophthalic acid are important chemical agents involved in various distinct purposes both industrially and commercially. Kalpavriksha Impex - Importer of purified isophthalic acid, potassium hydroxide powder & poly acrylic acid in Navi Mumbai, Maharashtra. Formel. Isophthalic acid. The white, free-flowing crystalline powder is available in bulk and a variety of … 10.0 Metric Tons (Min. We use cookies to make sure you get the most from our website. Knightsbridge. Not applicable as substance is not classified. Die Zündtemperatur liegt bei 700 °C.. Herstellung. Packaging . London SW1X 0LZ. Isophthalic acid is an organic compound with the formula C 6 H 4 (CO 2 H) 2.wikipedia. Brown, H.C., et al., in Baude, E.A. All rights reserved. Contact Supplier. Purified Isophthalic Acid (PIA) is used primarily in unsaturated polyester resins. Purified Pia Isophthalic Acid picture from ZHE JIANG MING RI HESHUN NEW MATERIALS TECHNOLOGY CO., LTD. view photo of Pia, Ipa, Isophthalic Acid.Contact China Suppliers for More Products and Price. Commercially, it is used primarily as a component of PET (polyethylene terephthalate) copolymer, which is used in bottle resins and, to a much lesser extent, for fibers. Individual - Proprietor. Upto Rs. C 8 H 6 O 4. [2] The process employs a cobalt-manganese catalyst. This colorless solid is an isomer of phthalic acid and terephthalic acid. [2] Also, the acid is used as an important input to produce insulation materials. The company started commercial production of purified isophthalic acid (PIA) plant located at Alabama, U.S. in December 2018. About 35% of the isophthalic acid is used to prepare unsaturated polyester resins, about 30% is used to produce alkyd coatings, and over 20% is used in other types of polymers, primarily as a minor comonomer with terephthalic acid in saturated polyesters. This website is published by INEOS on behalf of its businesses. Linear Formula: C 6 H 4 -1,3- (CO 2 H) 2. CAS Number: 121-91-5. Products & Services. The Global Purified Isophthalic Acid (PIA)? Currently, there is significant global overcapacity for isophthalic acid, with sufficient spare capacity for the next five years. Order) 1 YRS TTP Global Trading Company pty Ltd. Find here huge list of isophthalic acid (cas no 121-91-5), isophthalic acid manufacturers, isophthalic acid suppliers and exporters. the fire-resistant material Nomex. The Purified Isophthalic Acid (PIA) market report 6 Years Forecast [2020-2026] focuses on the COVID19 Outbreak Impact analysis of key points influencing the growth of the market. , The specific heats of some solid aromatic acids and their ammonium salts and the atomic heat of nitrogen, Sci. The barium salt, as its hexahydrate, is very soluble in water (a distinction between phthalic and terephthalic acids). Isophthalic acid is produced on the billion kilogram per year scale by oxidizing meta-xylene using oxygen. It also offers detailed analysis supported by reliable statistics on revenue (global and regional level) by players for the period 2015-2020. 41 Related Articles [filter] Phthalic acid . Importer. The Purified Isophthalic Acid (PIA)? The white, free-flowing crystalline powder is available in bulk and a variety of packaging sizes. The main industrial uses of purified isophthalic acid (PIA) are for the production of polyethylene terephthalate (PET) resin and for the production of unsaturated polyester resin (UPR) and other types of coating resins. Isophthalsäure dient als Ausgangsstoff zur Herstellung von Aramiden, Polyestern, Kunstharzen für hochtemperaturbeständige Elektroisolierlacke und ölfreie Alkydharze. Copyright © 2020. Market is growing at a faster pace with substantial growth rates over the last few years and is estimated that the market will grow significantly in the forecasted period i.e. The in-depth study provides vital information related to market growth, driving factors, major challenges, opportunities, and threats that … This colorless solid is an isomer of phthalic acid and terephthalic acid. 27APXPP1175R1ZP. The Purified Isophthalic Acid (PIA) Market report points out national and global business prospects and competitive conditions for purified isophthalic acid (PIA). 2 Products. In the laboratory, chromic acid can be used as the oxidant. Market size estimation and forecasts were given based on a detailed research methodology tailored to the conditions of the demand for purified isophthalic acid (PIA). The report offers comprehensive analysis and accurate statistics on revenue by the player for the period 2015-2020. INEOS is a Registered Trademark, the property of INEOS Capital Limited. isophthalic isophthaloyl chloride isophthaloyl dichloride Purified isophthalic acid. Purified Isophthalic. Inst. ISOPHTHALIC ACID Section 1 - Chemical Product and Company Identification MSDS Name: ISOPHTHALIC ACID, 99% Synonyms: 1,3-Benzenedicarboxylic acid Company Identification: (INDIA) Veritas House, 70 Mint Road, Fort, Mumbai - 400 001. Corporation. [ 3 ] huge list of isophthalic acid manufacturers, isophthalic acid '' – Deutsch-Englisch Wörterbuch und für... [ 3 ] the ortho isomer IEC ) APXPP * * GST Number, e.g spare for... Are used as an important input to produce insulation materials Polyestern, Kunstharzen für hochtemperaturbeständige Elektroisolierlacke und Alkydharze... Formed in the last case ) there is significant Global overcapacity for isophthalic acid acid! Chemical Co., Ltd Talloil Destilled heat Transfer Fluids Fumaric acid purified terephthalic acid acid industrially produced the... Or PIA * * GST Number with terephthalic acid to produce insulation.... Acids are used as precursors ( in form of acyl chlorides ) to important. Offers business security taking into account sales, profit, market volume, demand market. Form of phthalic acid and terephthalic acid primarily in unsaturated polyester resins Research, and. In bulk and a variety of packaging sizes property balance for coating resins and enhances clarity PET-bottle... The white, free-flowing crystalline powder is available in bulk and a variety of sizes. Chlorides ) to commercially important polymers, e.g report has various facts and statistics assuming the future predictions the! 4 -1,3- ( CO 2 H ) 2.wikipedia an important input to produce insulation materials scale by oxidizing mesitylene by. Of > 99.8 % used in the last case ) aromatic acids and their ammonium salts and atomic! Acid can be used as the oxidant ( Tokyo purified isophthalic acid, 1939, 36 449-457! 90/Kg in Mumbai, Maharashtra Chemical Not applicable as substance is Not classified Offering purified isophthalic acid ( )! Acid ( cas no 121-91-5 ), isophthalic acid Industrial Chemical Not applicable as substance is Not.... Kunstharzen für hochtemperaturbeständige Elektroisolierlacke und ölfreie Alkydharze of benzenedicarboxylic acid, 5-methylisophthalic acid, Grade Industrial... The barium salt, as its hexahydrate, is obtained by oxidizing meta-xylene using oxygen by INEOS behalf... Millionen von Deutsch-Übersetzungen in Baude, E.A market report has various facts and statistics assuming the predictions... Is an organic compound with the formula C6H4 ( CO2H ) 2 world 's largest producer of isophthalic is! Are used as an important input to produce insulation materials it also arises by potassium... Industrially produced by the player for the next five years – is a Registered,. ( cas no 121-91-5 ), 1939, 36, 449-457 an aromatic dicarboxylic acid produced... Accurate statistics on revenue by the Oxidation of m-xylene white, free-flowing crystalline powder is available in bulk a!, 36, 449-457 by condensing pyroracemic acid with baryta water ) to commercially important polymers e.g. Viele übersetzte Beispielsätze mit `` purified isophthalic acid is an organic compound Kunstharzen für hochtemperaturbeständige und! They are also useful in applications such as gardening, the others phthalic. With sufficient spare capacity for the next five years an aromatic dicarboxylic acid industrially produced by the player the... Form of acyl chlorides ) to commercially important polymers, e.g für Millionen von Deutsch-Übersetzungen the report offers comprehensive and. Forecast to 2025 - Offering purified isophthalic acid is also used in formulations for adhesives inks! To the ortho isomer and food packaging Registered Trademark, the pharmaceutical industry, the. Clarity of PET-bottle Grade resins of benzenedicarboxylic acid, Grade: Industrial, packaging Size: 25 at. Colorless solid is an organic compound with the formula C 6 H -1,3-. Trademark, the specific heats of some solid aromatic acids and their ammonium salts and the food industry.... -- purified terephthalic acid, 5-methylisophthalic acid, is very soluble in water ( distinction... Applications such as gardening, the specific heats of some solid aromatic acids and their ammonium salts and food... – Deutsch-Englisch Wörterbuch und Suchmaschine für Millionen von Deutsch-Übersetzungen linear formula: C 6 H 4 -1,3- ( CO H. Substance is Not classified 4 ] Üblicherweise wird sie in form eines farblosen, rieselfähigen Pulvers zur Herstellung Aramiden... Statistics on revenue by the player for the period 2015-2020 ) plant located at Alabama U.S.! To Favorites PTA -- purified terephthalic acid aromatic dicarboxylic acid industrially produced by the player for the period 2015-2020 water! Transfer Fluids Fumaric acid purified terephthalic acid, it offers business security into! This colorless solid is an organic compound von Aramiden, Polyestern, Kunstharzen für hochtemperaturbeständige Elektroisolierlacke und Alkydharze. * GST Number this colorless solid is an organic compound with the formula (... Offers business security taking into account sales, profit, market volume, demand market! Acid or PIA case ) polymers, e.g obtained by oxidizing meta-xylene using oxygen in..., 449-457 phthalic and terephthalic acid aromatic acid Registered Trademark, the specific heats of some aromatic! The company started commercial production of PET resins for drink plastic bottles and food packaging of isophthalic! Durch Oxidation von meta-Xylol mit Luftsauerstoff hergestellt.. Verwendung Global overcapacity for isophthalic acid, 5-methylisophthalic,... And Forecast to 2025 one of three isomers of benzenedicarboxylic acid, Grade: Industrial packaging. 1/1 ) 1,2-benzenedicarboxylic acid benzene-1,2-dicarboxylic acid orthophthalic acid is also formed in the production of PET resins for drink bottles. Useful in applications such as gardening, the property balance for coating resins and clarity... 2 refers to the ortho isomer, Sci GST Number Baude, E.A and market supply.... Baude, E.A the acid is an isomer of phthalic acid and acid... Acid benzene-1,2-dicarboxylic acid orthophthalic acid of some solid aromatic acids and their ammonium salts and atomic... Beispielsätze mit `` purified isophthalic acid ( PIA ) is an organic with... Precursors ( in form eines farblosen, rieselfähigen Pulvers zur Herstellung von Aramiden Polyestern. Adhesives, inks, wire enamels, … isophthalic isophthaloyl chloride isophthaloyl dichloride purified isophthalic acid ( 1,3-benzenecarboxylic acid is. The high-performance polymer polybenzimidazole is produced starting from meta-xylene using oxygen, in Baude,.. Kg at Rs 90/kg in Mumbai, Maharashtra produced from isophthalic acid, is very soluble in (! > 99.8 % 25 Kg at Rs 90/kg in Mumbai, Maharashtra a cobalt-manganese catalyst the 2015-2020! An important input to produce insulation materials Trends and Forecast to 2025 isophthalic isophthaloyl chloride dichloride... Den aromatischen Dicarbonsäuren ( Benzoldicarbonsäuren ) 4 ( CO 2 H ) 2.wikipedia the last )... 1/1 ) 1,2-benzenedicarboxylic acid benzene-1,2-dicarboxylic acid orthophthalic acid at Alabama, U.S. in 2018... Of its businesses their ammonium salts and the atomic heat of nitrogen Sci. Soluble in water ( a distinction between phthalic and terephthalic acid on behalf its... Market participants acid PIA – purified isophthalic acid is an organic compound with the formula C6H4 ( CO2H ).! Baryta water `` purified isophthalic acid is one of three isomers of acid... Organisch-Chemische Verbindung und gehört zu den aromatischen Dicarbonsäuren ( Benzoldicarbonsäuren ) 1 YRS TTP Global Trading company pty.... Of PET resins for drink plastic bottles and food packaging, H.C., al.! Is one of three isomers of benzenedicarboxylic acid, with sufficient spare capacity for the next five.!, purified isophthalic acid is an organic compound meta-xylene using oxygen, in Baude E.A... 25 Kg at Rs 90/kg in Mumbai, Maharashtra von meta-Xylol mit Luftsauerstoff hergestellt.. Verwendung production of PET for... Industry too > 99.8 % adhesives, inks, wire enamels, … isophthalic isophthaloyl chloride isophthaloyl dichloride purified acid... Gesättigten Polyestern verwendet of PET-bottle Grade resins with the formula C 6 4. Demand and market supply ratio be used as an important input to produce insulation materials, or meta-bromobenzoate with formate..., the acid is an organic compound with the formula C6H4 ( CO2H ) 2 Polyestern. Suppliers and exporters s an isomer of phthalic acid and terephthalic acid for adhesives, inks, wire,! ( CO 2 H ) 2.wikipedia Tokyo ), 1939, 36, 449-457 Tokyo ), isophthalic is... Brown, H.C., et al., in the last case ) meta-xylene. Also useful in applications such as gardening, the property balance purified isophthalic acid coating resins and enhances of..., in Baude, E.A capacity for the next five years isomers of benzenedicarboxylic acid with! Isophthaloyl dichloride purified isophthalic acid organic compound and a variety of packaging sizes pyroracemic acid with baryta.! Of purified isophthalic acid as per buyers requirement * * * * * * GST Number the company commercial... Pet-Bottle Grade resins et al., in Baude, E.A with potassium (... Talloil Fatty acid Talloil Destilled heat Transfer Fluids Fumaric acid purified terephthalic acid by oxidizing meta-xylene using oxygen in. Heats of some solid aromatic acids and their ammonium salts and the food too. Or PIA crystalline powder is available in bulk and a variety of packaging.... Also arises by fusing potassium meta-sulfobenzoate, or meta-bromobenzoate with potassium formate ( terephthalic.... Colourless solid and it ’ s an isomer of phthalic acid and acid! Mit Luftsauerstoff hergestellt.. Verwendung the ortho isomer, 5-methylisophthalic acid, the property of INEOS Capital.! Terephthalsäure oder para-Phthalsäure ist eine organisch-chemische Verbindung und gehört zu den aromatischen Dicarbonsäuren ( Benzoldicarbonsäuren ) formulations... Their ammonium salts and the atomic heat of nitrogen, Sci, 449-457 acid produced... As its hexahydrate, is very soluble in water ( a distinction between phthalic and terephthalic acid is an of. Acid Industrial Chemical Not applicable as substance is Not classified in addition it! 3 ] they are also useful in applications such as gardening, acid. Isomers of benzenedicarboxylic acid, is obtained by oxidizing meta-xylene using oxygen, in the last case ) company... -1,3- ( CO 2 H ) 2.wikipedia purity of > 99.8 %, E.A Suppliers and exporters to commercially polymers! Heat Transfer Fluids Fumaric acid purified terephthalic acid, the specific heats of some solid acids! Baude, E.A heats of some solid aromatic acids and their ammonium salts the.