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Systems and methods for production of aromatic carboxylic acids

A reactor, primary oxidation technology, applied in chemical instruments and methods, methods of chemically changing substances by using atmospheric pressure, separation/purification of carboxylic acid compounds, etc.

Active Publication Date: 2012-08-29
INVISTA TEKSTAJLS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this approach requires a capital outlay for the compressor

Method used

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  • Systems and methods for production of aromatic carboxylic acids
  • Systems and methods for production of aromatic carboxylic acids
  • Systems and methods for production of aromatic carboxylic acids

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0041] In Table 1, a calculated comparison of equivalent duty with a significant reduction in the total surface area of ​​the primary heat recovery heat exchanger is given, which shows that the costly, durable An astonishing reduction in the amount of etched material.

[0042] Table 1 Comparison of Process Equipment Items

[0043] Example 1 comparative example Primary heat recovery heat exchanger area (m 2 ) 6913 9106 Heat exchanger pressure drop (bar) 0.93 0.41 steam scrubber 1 2 steam scrubber drain lead to energy recovery Gateway to Energy Recovery and Atmosphere

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Abstract

This invention relates to systems and methods to recover heat and scrub the off-gas from oxidation reactors in a process to produce aromatic carboxylic acids, such as terephthalic acid.

Description

field of invention [0001] The present invention relates to systems and methods for recovering heat and scrubbing off-gases from oxidation reactors in the production of aromatic carboxylic acids. [0002] Cross References to Related Applications [0003] This application claims the benefit of priority to US Provisional Application 61 / 286957, filed December 16, 2009. Background of the invention [0004] Purified terephthalic acid (PTA) can be produced using a two-stage process. In the first stage, crude terephthalic acid (CTA) is produced by air oxidation of p-xylene using a homogeneous catalyst in a solvent such as acetic acid and water in an oxidation plant. The temperature range of the reaction is about 150-210°C. The oxidation reaction is usually carried out in one, two or three vessels in series, and multiple parallel reactors may be employed for each step. The reactor vessel is typically a stirred vessel, wherein the agitation is achieved by a combination of mechani...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/265C07C63/26C07B41/08B01J3/00
CPCB01J19/0013B01J2219/00006C07C51/265C07C51/42Y02P20/50C07C63/26
Inventor A.P.J.林巴赫R.J.奥布赖恩J.A.特纳
Owner INVISTA TEKSTAJLS