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High-pressure condensate generation in manufacture of purified aromatic carboxylic acids

An aromatic carboxylic acid, high-pressure condensation technology, used in the preparation of carboxylate, the separation/purification of carboxylic acid compounds, organic chemistry, etc.

Pending Publication Date: 2020-11-10
英力士美国化学公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Despite this energy generation, the fuel costs associated with producing the high pressure steam contribute to the overall variable cost of the process for making the purified aromatic carboxylic acid

Method used

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  • High-pressure condensate generation in manufacture of purified aromatic carboxylic acids
  • High-pressure condensate generation in manufacture of purified aromatic carboxylic acids

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Embodiment Construction

[0016] As a general introduction, the present invention relates to a process for the manufacture of purified aromatic carboxylic acids utilizing efficient heat exchange configurations in the preheating of crude aromatic carboxylic acids prior to purification. Prior to purification of the crude aromatic carboxylic acid, the crude aromatic carboxylic acid is heated in a preheating zone using high pressure steam. At least a portion of the high pressure condensate resulting from condensation of the high pressure steam in the preheating zone may be recycled to provide at least a portion of the boiler feed water from which the high pressure steam is generated. The method avoids depressurizing the high pressure condensate, resulting in fuel savings and a reduction in overall energy costs compared to prior art systems. The method also avoids the capital expenditure of condensate flash drums required in some prior art systems for generating steam at various lower pressure steam levels....

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Abstract

Processes for manufacturing purified aromatic carboxylic acids include: generating high-pressure steam from boiler feed wafer supplied to a boiler; heating a crude aromatic carboxylic acid using the high-pressure steam, whereby the high pressure steam is condensed to form a high-pressure condensate; and purifying the crude aromatic carboxylic acid to form a purified aromatic carboxylic acid. The boiler feed water includes at least a portion of the high-pressure condensate and makeup boiler feed water from at least one additional source. Compared with a conventional system for reducing the pressure of the high-pressure condensate, the method has the advantage that the energy cost can be comprehensively reduced.

Description

[0001] This application is a divisional application of the international application PCT / US2014 / 015833 that entered the Chinese national phase on June 28, 2016, with the application number 201480071477.7, and the title of the invention "High-pressure condensate generation in the manufacture of purified aromatic carboxylic acids" . [0002] Cross-References to Related Applications [0003] This application claims the benefit of priority to US Provisional Application No. 61 / 922,234, filed December 31, 2013. technical field [0004] The present teachings relate to methods of making purified aromatic carboxylic acids, and in particular, methods of preheating crude aromatic carboxylic acids with high pressure steam prior to purification. Background technique [0005] Terephthalic acid (TA) and other aromatic carboxylic acids can be used to make polyesters (eg, via their reaction with ethylene glycol and / or higher alkylene glycols). Polyester in turn can be used to make fibers, ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/265C07C51/42C07C63/26
CPCC07C51/43C07C51/487C07C63/26C07C51/265C07C51/42
Inventor 弗雷德·T·克拉克托马斯·M·巴托斯阿伦·P·纳尔逊
Owner 英力士美国化学公司