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Method for processing solvent and byproducts in aromatic carboxylic acid production

A technology for aromatic carboxylic acids and by-products, which is applied in the field of comprehensive treatment of solvents and by-products in the production of aromatic carboxylic acids, which can solve problems such as high heat of vaporization, high energy consumption of devices, and large amount of steam, so as to reduce consumption and reduce acetic acid Unit consumption, the effect of increasing economic value

Active Publication Date: 2010-08-04
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the water content in the feed of the azeotropic distillation tower is high, due to the high vaporization heat of water, if the azeotropic distillation process is directly used, the required amount of steam will be large, resulting in high energy consumption of the device

Method used

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  • Method for processing solvent and byproducts in aromatic carboxylic acid production
  • Method for processing solvent and byproducts in aromatic carboxylic acid production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A. 35000kg / h of acetic acid mixed solution from the water extraction process (containing 14070kg / h of acetic acid, 20265kg / h of water, 665kg / h of methyl acetate), and 3435kg / h of dilute solution from the hydrolysis device of methyl acetate (containing 1305kg of acetic acid / h, water 2130kg / h) enters from the top of the packing section of the extraction tower, 54300kg / h in the organic phase after decanter stratification (containing isobutyl acetate 50499kg / h, water 1955kg / h, methyl acetate 1846kg / h h) It enters from the bottom of the packing section of the extraction tower, contacts in countercurrent in the extraction tower, and obtains a raffinate phase of 11563kg / h (containing acetic acid 2kg / h, isobutyl acetate 48kg / h, water 11466kg / h, methyl acetate ester 47kg / h), the tower top obtains extract phase 81172kg / h (containing acetic acid 15373kg / h, isobutyl acetate 50451kg / h, water 12884kg / h, methyl acetate 2464kg / h);

[0027] B. Extraction tower overhead extraction phase...

Embodiment 2

[0033] A. Acetic acid mixed solution 35689kg / h (containing acetic acid 13148kg / h, water 21947kg / h, methyl acetate 594kg / h) from the water extraction process, and dilute solution 5231kg / h (containing acetic acid 942kg / h, water 4289kg / h) enters from the top of the packing section of the extraction tower, 109720kg / h in the organic phase after decanter stratification (containing propyl acetate 87776kg / h, water 17555kg / h, methyl acetate 4389kg / h ) enters from the bottom of the packing section of the extraction tower, contacts in countercurrent in the extraction tower, and obtains the raffinate phase 25252kg / h (containing acetic acid 2kg / h, propyl acetate 218kg / h, water 24886kg / h, methyl acetate 146kg / h), tower top obtains extraction phase 125388kg / h (containing acetic acid 14088kg / h, propyl acetate 87558kg / h, water 18905kg / h, methyl acetate 4837kg / h);

[0034] B. the extraction tower overhead extraction phase 125388kg / h in the step A (containing acetic acid 14088kg / h, propyl acet...

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Abstract

The invention relates to a method for processing a solvent and byproducts in aromatic carboxylic acid production. The processed raw materials comprise a solvent, namely acetic acid and byproducts, namely methylacetate and water in the aromatic carboxylic acid production; and an extraction column, an azeotropic distillation column, a solvent recovery column, a catalytic distillation column and a four-element component separating column are involved in the whole process flow. In the method, the methylacetate of little value can be hydrolyzed into the acetic acid and methanol, so the single consumption of the acetic acid can be reduced in a PTA production process and the economic value of the device is improved; the water used in the methylacetate hydrolysis is taken from the waste water generated from acetic acid concentration, so water resource is effectively utilized, treatment capacity of the waste water is reduced, and the production cost is lowered; and besides, the using amount ofthe entrainer is reduced and the consumption is correspondingly reduced, so the method has the characteristics of high efficiency, energy conservation and the like.

Description

technical field [0001] The invention relates to a method for comprehensively treating solvents and by-products in the production of aromatic carboxylic acids. Background technique [0002] Purified terephthalic acid (PTA) is the main raw material for producing polyester fiber. Its main production process is to use p-xylene as raw material, acetic acid as solvent, cobalt acetate and manganese as catalyst, and hydrobromic acid as accelerator. React with oxygen in the air under pressure to generate crude terephthalic acid, and then refine it to get PTA. In order for the oxidation reaction to proceed normally, the solvent dehydration unit must remove the water produced by the oxidation reaction, the water entrained by the compressed air, and the water added to the oxidation tail gas from the system in time, and at the same time recover acetic acid from the water as much as possible to reduce the consumption of acetic acid . In the process of p-xylene oxidation, the incomplete ...

Claims

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Application Information

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IPC IPC(8): C07C63/26C07C51/42C07C53/08C07C51/09C07C31/04C07C29/09
CPCY02P20/52Y02P20/10
Inventor 管国锋万辉白新伟
Owner NANJING UNIV OF TECH
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