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System and method for acetic acid dehydration

A kind of technology of acetic acid and distillation system, applied in the field of chemical process of distilling industrial chemicals

Inactive Publication Date: 2008-11-26
AMT INT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method must be cost-effective, energy-efficient and fit into existing terephthalic acid manufacturing facilities

Method used

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  • System and method for acetic acid dehydration
  • System and method for acetic acid dehydration
  • System and method for acetic acid dehydration

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0043] This example illustrates several benefits of the present technology using an extraction column compared to traditional distillation and azeotropic acetic acid dehydration techniques that do not use an extraction column. In particular, all three technologies are integrated in a typical 350,000 MTA terephthalic acid manufacturing facility to determine their different operational requirements and efficiencies. In this example, all distillation columns had 90 trays; conventional and azeotropic distillation columns were operated at ambient pressure. Various design and general operating parameters are given below.

[0044] Parameters Conventional Distillation Azeotropic Distillation Invention

[0045] azeotrope no yes yes

[0046] Extraction solvent no no yes

[0047] Number of trays in dehydration distillation column 90 90 90

[0048] System steam consumption (tons / hour) 60 42 36

[0049] Acetic acid sent to wastewater treatment (WWT)

[0050] ...

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PUM

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Abstract

Disclosed is a distillation system and method for recovering acetic acid from a feed stream containing acetic acid and water stream generated during terephthalic acid production. The invention includes a liquid-liquid extraction column and a dehydration distillation column utilizing azeotropic distillation or conventional to recover the acetic acid. The liquid-liquid extraction column is installed upstream from the dehydration distillation column. The liquid-liquid extraction column produces an extract of an extraction solvent and acetic acid which is sent to the dehydration distillation column to separate the extraction solvent and acetic acid. The dehydration distillation column may be used with or without a condenser system to recover the energy. The condenser system is a steam generator that condenses the vapor into a concentrated acetic acid stream while generating a low pressure steam. Any remaining acetic acid in water is sent to a waste water recycling facility.

Description

technical field [0001] The present invention generally relates to a chemical process for distilling industrial chemicals, and more particularly to a distillation system and method for recovering acetic acid from water. The present invention is particularly suitable for the recovery of acetic acid in the manufacture of terephthalic acid. Background technique [0002] Terephthalic acid is used in a variety of industrial applications and chemical processes. For example, terephthalic acid is a raw material used to make polyesters such as DACRON polyesters used in textiles and packaging. Commercially available MYLAR's polyethylene terephthalate (PET) is a very tough polyester material and is used in a range of industrial and consumer products, including beverage containers and clamshell packaging. Purified terephthalic acid (PTA) is a high-grade terephthalic acid suitable for refining industrial applications. [0003] Terephthalic acid is produced by the reaction of oxygen mol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/46B01D3/36C07C51/48C07C63/26
CPCC07C51/46B01D3/146B01D3/40C07C51/48Y02P20/50Y02P70/10C07C63/26B01D3/36C07B63/00
Inventor 蒋季勇吴光宇
Owner AMT INT INC
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