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Recovering device for oxidization low pressure end gas in process of preparing terephthalic acid

A technology for recovering terephthalic acid and tail gas, which is applied in the fields of organic chemistry, carboxylate preparation, carboxylate preparation, etc., can solve the problems of unreliable operation status of tail gas compressor system, large liquid entrainment, and inability to cool, etc. Achieve significant economic benefits, improved recycling rate, and reliable operation.

Active Publication Date: 2009-08-12
SINOPEC YIZHENG CHEM FIBER
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Problems solved by technology

[0005] The actual operation shows that the oxidation low-pressure tail gas system in the production of terephthalic acid has a large flow rate, a fast flow rate, and a large amount of liquid entrainment. The existing recovery device cannot sufficiently cool the liquid entrained in the tail gas to form a condensate. Unreliable, the organic matter such as PX and methyl acetate contained in the tail gas can only be partly emptied, and part of the condensate is formed in the suction section cooler and sent to the waste water treatment device for treatment, which is wasted

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  • Recovering device for oxidization low pressure end gas in process of preparing terephthalic acid
  • Recovering device for oxidization low pressure end gas in process of preparing terephthalic acid
  • Recovering device for oxidization low pressure end gas in process of preparing terephthalic acid

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Embodiment Construction

[0018] The invention aims at the defects of the low-pressure tail gas recovery device in the oxidation stage of the terephthalic acid production in the prior art, abandons the complex and unreliable tail gas compressor system, and completely solves the serious failure of the compressor caused by a large amount of liquid entrainment into the compressor and cannot operate normally To solve the problem, the PX and methyl acetate in the tail gas can be effectively recovered, and the unit consumption of raw materials of the whole device can be reduced.

[0019] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.

[0020] Such as figure 1 As shown, in the oxidation low-pressure tail gas recovery device in the production of terephthalic acid, the low-pressure tail gas 1 from the condensing tank of the acetic acid dehydration tower in the oxidation stage of the terephthalic acid production enters the high-effic...

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Abstract

The invention discloses a recycling device of p-xylene and methyl acetate, which comprises the following parts: high-effective condenser, which quenches gas p-xylene and methyl acetate into liquid; oil-water separator, which separates p-xylene and methyl acetate from water automatically. The invention solves the problem of tail gas with liquid as well as the problem of separation and recycling.

Description

technical field [0001] The invention relates to a device used in the oxidation stage in the terephthalic acid production process, especially a recovery device for the low-pressure tail gas in the above-mentioned oxidation stage, especially a device for recovering the above-mentioned low-pressure tail gas by using static equipment, and belongs to the technical field of terephthalic acid production . Background technique [0002] Purified terephthalic acid (PTA) is an important intermediate product in industrial production, and it is the main raw material for polyester production. The production process of PTA mainly includes two stages of oxidation and refining. In the oxidation stage, acetic acid is used as a solvent, and an oxidation reaction occurs from p-xylene (PX) and oxygen in the air under the combined action of a certain temperature, pressure and catalyst to form Crude terephthalic acid. Crude terephthalic acid is refined and purified to obtain refined terephthalic...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C63/26C07C51/255C07C15/08C07C7/09C07C69/14C07C67/52B01D53/46
Inventor 仲军实沈向阳朱雪灵周海平薛月霞董学军陈志明
Owner SINOPEC YIZHENG CHEM FIBER
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