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Crude terephthalic acid mother solution replacing method

A technology for crude terephthalic acid and p-xylene, applied in separation methods, chemical instruments and methods, liquid displacement, etc., can solve problems such as unstable operation, complex equipment structure, low replacement efficiency, etc., and achieve fast settling speed , Simple equipment structure and high replacement efficiency

Active Publication Date: 2014-03-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is that there are problems of low replacement efficiency, unstable operation and complex equipment structure in the existing crude terephthalic acid mother liquor replacement technology, and a new crude terephthalic acid mother liquor replacement method is provided

Method used

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  • Crude terephthalic acid mother solution replacing method
  • Crude terephthalic acid mother solution replacing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] according to figure 1 The equipment shown is used in a terephthalic acid plant to conduct experiments with crude terephthalic acid slurry (including 92% acetic acid, 7.7% water and a small amount of oxidation catalyst) as the raw material. refer to figure 1 with 2 , this replacement tower 17 is divided into three sections, wherein the clarification section area 18 is 150 millimeters high and the circular cross-section diameter is 80 millimeters, and the displacement section area 19 is 900 millimeters high and 60 millimeters in diameter, and the clarification section and the displacement section cross-sectional area ratio are 1.78: 1, the tower The area 20 of the solid stockpiling section at the lower part of the body is an inverted conical design, and the height of the cone is 60 mm; a main shaft 8 is installed in the tower, and 10 sieve plates 9 distributed in the area of ​​the replacement section are connected to the shaft, and the spacing between the plates is 90 mm...

Embodiment 2～5

[0022] Repeat Example 1, except that the diameter of the clarification section is changed, that is, the ratio of the cross-sectional area of ​​the clarification section to the replacement section, the number of sieve plates and the spacing between the plates, and the results are listed in Table 1. The experimental results fully meet the requirements of the subsequent hydrorefining section, and the operation is stable.

[0023] Table 1

[0024] Example number

Embodiment 6～7

[0026] Repeat Example 1, the difference is to change the raw slurry feed temperature, pressure, the results are listed in Table 2. The experimental results fully meet the requirements of the subsequent hydrorefining section, and the operation is stable.

[0027] Table 2

[0028] Example number

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Abstract

The invention relates to a crude terephthalic acid mother solution replacing method which mainly solves the problems of low replacement efficiency, unstable operation and complicated equipment structure in the existing crude terephthalic acid mother solution replacing technology. In the invention, the crude terephthalic acid obtained by liquid phase oxidation of paraxylene in an acetic acid solvent is used as an original slurry, and water is used as a replacing solution for carrying out contact replacement in a replacing tower, so that the acetic acid in the slurry is replaced, wherein the replacing tower comprises a settling section, a replacing section, a stacking section, a slurry inlet, a slurry outlet, a replacing solution inlet and a replacing solution outlet; a main shaft is connected with a sieve plate positioned in the replacing section; the slurry inlet is positioned at the upper part of the replacing section, and the slurry outlet is positioned at the lower part of the solid stacking section; the replacing solution inlet is positioned at the lower part of the solid stacking section and below the slurry outlet; the replacing solution outlet is positioned at the upper part of the settling section; the ratio of the sectional area of the settling section to the sectional area of the replacing section is (1.01-4):1; and the solid stacking section is in an inverted cone shape. The technical scheme better solves the problems and can be used in production by the crude terephthalic acid mother solution replacing process.

Description

technical field [0001] The invention relates to a method for replacing the mother liquor of crude terephthalic acid, more specifically, the invention relates to a method for replacing the mother liquor of acetic acid in the crude terephthalic acid slurry with water. Background technique [0002] Terephthalic acid is usually obtained by liquid-phase oxidation of p-xylene in acetic acid solvent with cobalt, manganese and bromine as catalysts. The crude terephthalic acid obtained by the above method needs to be further purified by hydrotreating to remove 4-CBA, PT acid, BA acid and some colored impurities to obtain purified terephthalic acid. Before hydrofining, the acetic acid in the crude terephthalic acid slurry must be removed to prepare a terephthalic acid aqueous slurry. The traditional process is to remove the mother liquor in the crude terephthalic acid with a combination of centrifugal filtration and drying equipment, and then beat with water to obtain a terephthalic ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C63/26C07C51/48B01D12/00
Inventor 龚海燕畅延青陈大伟张海涛
Owner CHINA PETROLEUM & CHEM CORP