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Method of replacing dispersion medium

A dispersion medium and replacement tank technology, applied in separation methods, chemical instruments and methods, crystallization separation, etc., can solve problems such as difficult operation and distributor blockage

Inactive Publication Date: 2009-07-01
MITSUBISHI GAS CHEM CO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the usual type of distributor with many fine holes is clogged, making it difficult to operate stably for a long period of time

Method used

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  • Method of replacing dispersion medium
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  • Method of replacing dispersion medium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0050] Examples are given below to describe the embodiment of the present invention in more detail. However, the present invention is not limited to these Examples.

reference example 1

[0052] use for observation Figure 5 In the experimental apparatus of the dispersion state shown, the dispersion state in the tank 1 (diameter 2m, height 4m) was examined. A water slurry (concentration of sand: 35% by weight) of sand with adjusted particle size (average particle size: 95 μm) was used as the raw slurry. The raw slurry is put into the tank 1, and in order not to accumulate sand at the bottom, the circulating pump 2 is used to circulate the raw slurry to the raw slurry supply port 5 through the electromagnetic flowmeter 4 and the flow regulating valve 3.

[0053] The circulating raw slurry is supplied to the swirl nozzle 6, and flows out into the tank 1 while maintaining a circular motion for dispersion. The structure of swirl nozzle 6 is as Figure 6 shown. The raw pulp supply part 11 is connected to the cylindrical part 10, and supplies raw pulp from the tangential direction of the cylindrical part 10. An opening 8 (opening diameter 0.58 m) and an opening 9...

Embodiment 1

[0061] Use with Figure 9 A device with the same structure was replaced with a dispersion medium. As the replacement tank, a closed container made of stainless steel with an inner diameter of 30 cm and a height of 100 cm was used.

[0062] A stainless steel airtight container was filled with water at 100° C., and the raw slurry containing 30% by weight of terephthalic acid and using water as the first dispersion medium was supplied to the same swirl nozzle as in Example 1 at 770 kg / h. Water as a second dispersion medium was supplied at a rate of 560 kg / h from the lower part of the substitution tank. The replacement slurry containing terephthalic acid crystals and the second dispersion medium is mainly taken out from the lower part of the replacement tank, and the first dispersion medium is mainly taken out from the upper part of the replacement tank. Dispersion medium replacement was carried out continuously for one week, and problems such as clogging did not occur.

[0063...

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Abstract

A method of replacing the first dispersion medium of a raw slurry composed of a first dispersion medium and crystal terephthalic acid with a second dispersion medium. The raw slurry is fed to a vertically extending cylindrical part of cyclone-shaped nozzle disposed in a superior portion of replacement vessel of dispersion medium replacing apparatus from its tangential direction and undergoes circular motion along the inner wall surface of the cylindrical part. The raw slurry in circular motion is discharged from an opening disposed in a vertically inferior portion of the cylindrical part and dispersed in a second dispersion medium fed from an inferior portion of the replacement vessel. The slurry after replacement composed mainly of crystal terephthalic acid and the second dispersion medium is drawn out from the inferior portion of the replacement vessel, while the first dispersion medium is drawn out from the superior portion of the replacement vessel.

Description

technical field [0001] The present invention relates to a method for replacing the first dispersion medium in the raw slurry containing the first dispersion medium and terephthalic acid crystals with the second dispersion medium. More specifically, it relates to the raw slurry containing the first dispersion medium and terephthalic acid crystals obtained through liquid-phase oxidation reaction or obtained through catalytic hydrogenation treatment or recrystallization treatment of crude terephthalic acid, which contains many impurities A dispersion medium replacement method in which the first dispersion medium is efficiently replaced by the second dispersion medium, and this method is suitable for the preparation of high-purity terephthalic acid. Background technique [0002] Terephthalic acid is produced by liquid-phase oxidation of p-phenylene compounds such as p-alkylbenzene represented by p-xylene. Usually using acetic acid as a solvent, in the presence of a catalyst suc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/47B01D12/00C07C63/26
CPCB01D9/0045C07C51/47C07C51/43B01D9/004C07C63/26B01D12/00C07C63/15
Inventor 稻荷雅人在间文哉
Owner MITSUBISHI GAS CHEM CO INC
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