- Preparation method and application of trimellitic acid or trimesic acid
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The invention belongs to the technical field of organic synthesis processes, and particularly relates to a preparation method and application of trimellitic acid or trimesic acid. According to the characteristics of the oxidation reaction process of 1,2,4-trimethylbenzene or mesitylene, two stages of reactors are connected in series, different oxidation reaction process conditions are respectively adopted, particularly, a second-stage reactor adopts a reaction strengthening technology, and an oxygen-enriched oxidation mode is adopted to strengthen the oxidation reaction process and increase the yield of the trimellitic acid or the trimesic acid.
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Paragraph 0024-0039
(2021/04/26)
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- METHOD FOR PRODUCING CARBOXYLIC ACID ANHYDRIDE, METHOD FOR PRODUCING CARBOXYLIC IMIDE, AND METHOD FOR MANUFACTURING ELECTROPHOTOGRAPHIC PHOTOSENSITIVE MEMBER
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A method for producing a carboxylic acid anhydride includes heating a composition containing a specific compound in a solvent to yield the carboxylic acid anhydride. The solvent is an aprotic polar solvent having a boiling point of 50° C. or more.
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Paragraph 0119
(2017/01/19)
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- PHYSICOCHEMICAL STUDY OF SEPARATION AND INTERACTION OF TRIMELLITIC ANHYDRIDE AND TRIMELLITIC ACID.
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The objective of this work is to study the physicochemical characteristics of TMAc (Trimellitic Acid) and TMAn (Trimellitic Anhydride) to select and develop a method for purification of technical TMAn obtained by dehydration of TMAc, and to investigate the phase diagram of the system TMAc-TMAn, obtained during production of technical TMAn. It is shown by the method of controlled sublimation for purification of crude TMAn that the purest fraction contains 99. 95 plus or minus 0. 03 mole % of TMAn; the purity of the sublimed product, determined cryoscopically, was 99. 95 plus or minus 0. 03 mole %. The experimental value of the cryoscopic constant of TMAn, 1. 45 plus or minus 0. 09 mole %/deg at P equals 0. 95, is in good agreement with the calculated value of 1. 53 mole %/deg. The enthalpy of fusion of TMAn was determined, and found to be 5. 20 plus or minus 0. 02 kcal/mole. Thermal analysis of the binary system TMAn-TMAc showed the existence of a eutectic, melting at 166 plus or minus 0. 5 degree and containing 3. 5 plus or minus 0. 5 mole % of TMAc.
- Dugacheva,Murogova,Tudorovskaya,Fedorova,Videneeva,Kalinchenko
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p. 105 - 108
(2007/10/02)
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