05-03-2015 дата публикации
Номер: US20150065747A1
Принадлежит:
A solid terephthalic acid composition and a process for producing terephthalic acid from para-xylene. The process comprises forming a mixture comprising the para-xylene, a solvent, a bromine source, and a catalyst; and oxidizing the para-xylene by contacting the mixture with an oxidizing agent at oxidizing conditions to produce a solid oxidation product comprising terephthalic acid, para-toluic acid, 4-carboxybenzaldehyde. The solvent comprises a carboxylic acid having from 1 to 7 carbon atoms and an dialkyl imidazolium ionic liquid; and the catalyst comprises at least one of cobalt, titanium, manganese, chromium, copper, nickel, vanadium, iron, molybdenum, tin, cerium, and zirconium. The solid terephthalic acid composition comprises, less than about 4,000 ppm-wt 4-carboxybenzaldehyde content, and more than about 2,000 ppm-wt a para-toluic acid. 1. A process for producing terephthalic acid from para-xylene , the process comprising:forming a mixture comprising the para-xylene, a solvent, a bromine source, a catalyst and optionally ammonium acetate; andoxidizing the para-xylene by contacting the mixture with an oxidizing agent at oxidizing conditions to produce a solid oxidation product, the solid oxidation product comprising terephthalic acid, 4-carboxybenzaldehyde, and para-toluic acid;wherein the solvent comprises a carboxylic acid having from 1 to 7 carbon atoms, a dialkyl imidazolium ionic liquid, and optionally water; and the catalyst comprises at least one of cobalt, titanium, manganese, chromium, copper, nickel, vanadium, iron, molybdenum, tin, cerium, and zirconium.2. The process of wherein the carboxylic acid comprises acetic acid.3. The process of wherein the oxidizing agent is a gas comprising oxygen.4. The process of wherein the solvent has a ratio of ionic liquid to carboxylic acid ranging from about 1:10 to about 10:1 by weight.5. The process of wherein the oxidizing conditions comprise a pressure ranging from about 0 MPa(g) to about 6 MPa(g).6. The ...
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