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Integrated Process for Recovery of Metal Catalysts in the Production of High Purity Terephthalic Acid

A production process and catalyst technology, applied in the field of integrated technology, can solve problems such as corrosion

Inactive Publication Date: 2016-08-17
RELIANCE INDUSTRIES LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, strong acids can cause corrosion throughout the process

Method used

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  • Integrated Process for Recovery of Metal Catalysts in the Production of High Purity Terephthalic Acid
  • Integrated Process for Recovery of Metal Catalysts in the Production of High Purity Terephthalic Acid
  • Integrated Process for Recovery of Metal Catalysts in the Production of High Purity Terephthalic Acid

Examples

Experimental program
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Effect test

example 1

[0055] example 1:

[0056] in the attached figure 1 In a typical device, methyl acetate and water are added to the reaction tower where oxalic acid exists in a weight ratio of 1:5 and stirred. The reaction was continued at 65°C for 30 minutes. After the reaction was complete, the whole mixture was distilled and the oxalic acid was isolated by cooling. The percentages of acetic acid and methanol formed were 55 and 45, respectively.

example 2

[0058] in the attached figure 2 A typical equipment in a is divided into a methyl acetate hydrolysis section and a catalyst recovery unit for a high-purity terephthalic acid (PTA) process. This example follows the steps of Example 1. The 10% oxalic acid solution containing acetic acid is separated by a cooling process and sent to the high purity terephthalic acid catalyst recovery unit where cobalt and manganese are separated as oxalate.

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Abstract

The present disclosure provides a process for recovering a PTA oxidation catalyst during the production of PTA (high purity terephthalic acid) using an acid catalyst containing a reactant stream obtained by hydrolysis of an organic ester.

Description

[0001] This application is a Patent Supplement to Indian Patent Application 1585 / MUM / 2011 filed on May 27, 2011, the entire contents of which are hereby expressly incorporated by reference. technical field [0002] The present invention relates to an integrated process involving the recovery of metal catalysts in the production of high purity terephthalic acid (PTA) utilizing an acid catalyst containing a reactant stream obtained from the hydrolysis of an organic ester. Background technique [0003] Methyl acetate is produced in large quantities as a by-product of high-purity terephthalic acid (PTA) production plants and polyvinyl alcohol (PVA) production plants. Since methyl acetate is a low-value solvent, methyl acetate is either sold at a low price, or hydrolyzed into methanol and acetic acid with higher value, and a conventional distillation process is required after the hydrolysis reaction. The hydrolytic conversion is not easy to reach equilibrium, and the large amount...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C51/09C07C51/265C07C51/41C07C51/43C07C53/08C07C55/07C07C63/26C07C63/24
CPCC07C51/09C07C51/265C07C51/412C07C51/43C07C53/08C07C63/24C07C63/26C07C55/07Y02P20/10
Inventor P·V·乌帕拉P·阿杜里T·马修U·拉特纳帕克希A·夏尔马T·乌基尔R·S·加德奇
Owner RELIANCE INDUSTRIES LIMITED
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