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Process for production of aromatic carboxylic acids with improved water removal technique

An aromatic, monocarboxylic acid technology, applied in the preparation of organic compounds, the preparation of carboxylate salts, chemical instruments and methods, etc.

Inactive Publication Date: 2004-10-13
GRUPO PETROTEMEX DE C V
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, direct distillation often requires additional heat input

Method used

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  • Process for production of aromatic carboxylic acids with improved water removal technique
  • Process for production of aromatic carboxylic acids with improved water removal technique
  • Process for production of aromatic carboxylic acids with improved water removal technique

Examples

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Embodiment

[0057] exist image 3 The method provided by the invention shown in will be further illustrated in the following examples. All parts and percentages in the examples are by weight unless otherwise specified.

[0058] Aqueous acetic acid solution containing dissolved catalyst was fed to reactor 12 through line 10 at a rate of about 30 parts / hour and p-xylene at a rate of about 1000 parts / hour. The reactor used was a vertical bubble column with a height to diameter ratio of 12:1. Air containing 0.5% water is fed through line 14 at a rate of about 4900 parts air / hour. The oxidation reaction medium is filled to approximately 85% of the reactor capacity. The temperature of the vigorously stirred reaction medium is about 140-160° C., and the pressure is controlled at about 5.9 bara (85 psia).

[0059] A reaction off-gas stream containing oxygen-depleted process gas, acetic acid and water is continuously withdrawn through an outlet located in the upper part of the reactor and sent...

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Abstract

Disclosed is an improved process for the continuous production of aromatic carboxylic acids by the liquid-phase oxidation of an alkyl aromatic compound with an oxygen-containing gas in the presence of oxidation catalyst which results in reduced wastewater generation, reduced condensing capacity requirements, and, optionally, increased power recovery, and. The process effectively utilizes the heat of reaction in the process of removing excess water generated from the reaction and minimizes the loss of solvent used as the carrier for the reaction catalyst by removing reactor off-gas directly into a water removal column for distillation. A portion of the overhead aqueous vapors are removed from the top of the water removal column as a vapor distillate, with the remaining overhead aqueous vapors being condensed then subsequently refluxed to the fractionating zone of the water removal column. In a preferred embodiment, the combined vapor distillate and oxygen-depleted process gas are reduced to a low pressure through a power recovery device for improved process efficiency, and then fed to a pollution control device for the destruction of organic compounds before exiting the process.

Description

technical field [0001] The present invention relates to an improved process for the continuous production of aromatic carboxylic acids by liquid-phase oxidation of alkylaromatics with molecular oxygen in the presence of an oxidation catalyst or catalyst system, wherein the exhaust gas from the oxidation unit consists mainly of water vapor and small amount of organic components, the exhaust gas is treated in a pollution control device. The effluent from the pollution control device is then removed from the production system. More specifically, the present invention relates to such a process utilizing oxidation energy in a columnar oxidation reactor equipped with means capable of efficiently removing the water produced during the reaction with only a small loss of solvent, The waste stream from the dehydration unit is sent to the pollution control unit, and the waste liquid from the pollution control unit is then removed from the production system. Background technique [00...

Claims

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Application Information

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IPC IPC(8): C07C51/265
CPCC07C51/265C07C63/26C07C63/24
Inventor H·D·小米勒R·林M·德弗雷德
Owner GRUPO PETROTEMEX DE C V
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