TH8132B - "Processes and equipment for producing aromatic carboxylic acids" - Google Patents

Abstract

The aim of this invention is to produce high quality aromatic carbonic acid by Liquid phase oxidation of alkylbenzene in contact with oxygen-rich gases. Destroys containing small aliphatic carboxylic acids. Under the exclusion of any acceleration of decay Of solvent molecules and the dangers of explosion accidents. The process for producing aromatic carboxylic acids is based on this invention by oxidation phase. Liquid of alkylbenzene by contact with alkylbenzene with oxygen-containing gas, There is a small aliphartic carboxylic acid. Giving alkylbenzene and solvent to reactor Giving as a molecular oxygen gas Oxygen-rich gases that contain oxygen The molecules at higher concentrations are present in the air to the reactor. Recirculation of at least part of the reactor exhaust gas in such a condition Or after being separated from their condensate to the inner fluid layer Reactor and By which oxidizing alkylbenzene to aromatic carboxylic acid

Claims (8)

1. Process for producing aromatic carboxylic acid by means of liquid phase oxidation of alkyl benzene. (alkylbenzene) with gas with oxygen molecules in solvents (solvent) containing aliphatic carboxylic acid (aliphatic carboxylic acid) small containing Dispensing alkylbenzene and solvent to reactor Supply gas with a high oxygen content, as a gas with that oxygen molecule, at a concentration of 20-100% by volume to the reactor. reactor Circulate the part of the excreted gas from the reactor back to the liquid layer in the reactor. Reactors and oxidizing alkylbenzene to aromatic carboxylic acid. Click by that way 2. Process according to claim 1, where aromatic carboxylic acid is terephthalic acid. (terephthalic acid) 3.Process for the production of aromatic carboxylic acids by the oxidation of the phases of Liquid of alkylbenzene with gas with oxygen molecules in solvents containing aliphatic acid. A small carboxylic containing Dispensing alkylbenzene and solvent to reactor Dispensing gas with high oxygen content, as a gas with oxygen molecules, at a concentration of 23-100% by volume to the reactor. Circulating the part of the gas that is expelled from the reactor after it is brought under the Removes condensable components back to the liquid layer in the Reactors and oxidizing alkylbenzene to aromatic carboxylic acid. Click by this method 4. Process according to claim 3, where the expelled gas portion is returned to the layer of The liquid in the reactor is not greater than 3/4 of the total depth of the fluid layer. Constant from the level of constant liquid 5.Process according to claim 3, where aromatic carboxylic acid is terephthalic acid. 6.Process for the production of aromatic carboxylic acids by phase oxidation. Of liquids of alkylbenzene with gas with oxygen molecules in solvents containing amorphous acids. Small liphatic carboxylic Containing Dispensing of alkyl benzene and solvent to reactor. Distribution of oxygen-rich gas mixtures. With oxygen molecules, as a gas that There are oxygen molecules, at a concentration of 23-100 percent by volume, and the gas that is excreted from The reactor goes to the reactor and oxidizes the alkylbenzene to Into aromatic carboxylic acid 7. Process according to claim 6, where the mixture of gases with high oxygen content and Expelled from the reactor, which is introduced under the removal of its condensable components, is used as a gas containing oxygen molecules. 8. Process according to claim 6, where aromatic carboxylic acid is terephthalic acid.