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Using pressurized wet gas lines to avoid fouling in purified terephthalic acid (PTA) filters and lines

A technology for filters and hydrogenation reactors, applied in chemical instruments and methods, mobile filter element filters, separation/purification of carboxylic acid compounds, etc., can solve the problems of increased fouling of filters and wet gas pipelines, increased evaporation, etc.

Active Publication Date: 2019-12-13
英力士美国化学公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Heating the inert gas and/or scrubbing fluid entering the filter unit can also lead

Method used

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  • Using pressurized wet gas lines to avoid fouling in purified terephthalic acid (PTA) filters and lines
  • Using pressurized wet gas lines to avoid fouling in purified terephthalic acid (PTA) filters and lines

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Embodiment Construction

[0014] As a general introduction, a method for recovering purified aromatic carboxylic acid according to the present invention comprises: contacting crude aromatic carboxylic acid with hydrogen in the presence of a catalyst in a hydrogenation reactor to form purified aromatic carboxylic acid; The purified aromatic carboxylic acid is crystallized to form a solid / liquid mixture comprising purified carboxylic acid solids; the solid / liquid mixture is filtered in a rotary pressure filter device to remove the liquid filtrate; used in a rotary pressure filter device washing the solid / liquid mixture with a washing fluid to form a washed solid / liquid mixture; and drying the washed solid / liquid mixture with an inert gas in a rotary pressure filter apparatus to form a solid comprising purified aromatic carboxylic acid filter cake and moisture flow. The method also includes withdrawing the wet gas stream from the rotary pressure filter apparatus while maintaining the wet gas stream at a p...

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Abstract

Processes for recovering a purified aromatic carboxylic acid include contacting a crude aromatic carboxylic acid with hydrogen in the presence of a catalyst in a hydrogenation reactor to form a purified aromatic carboxylic acid; crystallizing the purified aromatic carboxylic acid to form a solid/liquid mixture comprising purified aromatic carboxylic acid solids; filtering the solid/liquid mixturein a rotary pressure filter apparatus to remove a liquid filtrate, washing the solid/liquid mixture in the rotary pressure apparatus with a wash fluid to form a washed solid/liquid mixture, and dryingthe washed solid/liquid mixture in the rotary pressure apparatus with an inert gas to form a filter cake comprising purified aromatic carboxylic acid solids and a wet gas stream; withdrawing the wetgas stream from the rotary pressure filter apparatus while maintaining the wet gas stream at a pressure above ambient; and recovering the purified aromatic carboxylic acid solids from the filter cake.

Description

technical field [0001] The present teachings relate generally to methods for making aromatic carboxylic acids, and in particular, to methods for purifying crude aromatic carboxylic acids. Background technique [0002] 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). Polyesters, in turn, can be used to make fibers, films, containers, bottles, other packaging materials, molded articles, and the like. [0003] In commercial practice, aromatic carboxylic acids have been prepared by liquid phase oxidation of methyl-substituted benzene and naphthalene feedstocks in aqueous acetic acid solvent. The position of the methyl substituent corresponds to the position of the carboxyl group in the aromatic carboxylic acid product. Air or other sources of oxygen (eg, typically in a gaseous state) have been used as oxidants in the presence of bromine-promoted catalysts cont...

Claims

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Application Information

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IPC IPC(8): C07C51/42C07C51/47C07C51/487C07C63/04C07C63/26C07C63/15
CPCC07C51/42C07C51/487C07C51/47C07C63/26C07C63/15C07C63/04C07C51/43C07C51/255B01D33/68B01D33/06B01D33/60B01D33/62B01D2009/0086
Inventor 蒂莫西·H·凯斯托马斯·巴托斯
Owner 英力士美国化学公司