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The extraction method of antimony triacetate

A technology of antimony triacetate and extraction method, which is applied in the chemical industry, and can solve the problems of multi-box storage space, affecting use, and difficulty in controlling the particle size of antimony triacetate crystals.

Active Publication Date: 2020-05-22
MATRIX GUANGZHOU CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the particle size of the product is too small, the product volume is large, and more packaging box storage space is required, and the powder product is easy to agglomerate during storage, which affects the use
If the product particles are too thick, it will be difficult to dissolve or dissolve for a long time, which will also affect the use
Therefore, in industrial production, there is a problem that the crystal particle size of antimony triacetate is difficult to control

Method used

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  • The extraction method of antimony triacetate
  • The extraction method of antimony triacetate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The extraction process of the antimony triacetate of the present embodiment is specifically as follows:

[0043] Put the toluene solution of antimony triacetate at a temperature of 113.5°C in a crystallization kettle with an absolute pressure of 760mmHg. Start the scheduled crystallization program on the PLC, reduce the pressure of the crystallization tank at a rate of 5mmHg / min under the control of the crystallization program, and at the same time reduce the temperature of the toluene solution of antimony triacetate in the crystallization tank until the temperature of the crystallization tank drops to 98°C, absolute pressure It is 415.5mmHg, and the preset program is automatically adjusted to reduce the crystallization kettle pressure at a speed of 2mmHg / min, while the temperature of the toluene solution of antimony triacetate in the kettle continues to decrease. Until there is obvious crystallization exotherm in the kettle, the temperature of the toluene solution of a...

Embodiment 2

[0045] The extraction process of the antimony triacetate of the present embodiment is specifically as follows:

[0046] Put the toluene solution of antimony triacetate at a temperature of 118°C in a crystallization kettle with an absolute pressure of 783.75mmHg. Start the scheduled crystallization program on the PLC, reduce the pressure of the crystallization tank at a rate of 6mmHg / min under the control of the crystallization program, and at the same time reduce the temperature of the toluene solution of antimony triacetate in the crystallization tank until the temperature of the crystallization tank drops to 99°C, absolute pressure 431.25mmHg, the preset program is automatically adjusted to reduce the pressure of the crystallization kettle at a speed of 2.5mmHg / min, while the temperature of the toluene solution of antimony triacetate in the kettle continues to decrease. Until there is obvious crystallization exotherm in the kettle, the temperature of the toluene solution of ...

Embodiment 3

[0048] The extraction process of the antimony triacetate of the present embodiment is specifically as follows:

[0049] Put the toluene solution of antimony triacetate at a temperature of 115.2°C in a crystallization kettle with an absolute pressure of 768.6mmHg. Start the predetermined crystallization program on the PLC, and reduce the pressure of the crystallization tank at a speed of 5.5mmHg / min under the control of the crystallization program, and at the same time, the temperature of the toluene solution of antimony triacetate in the crystallization tank decreases accordingly, until the temperature of the crystallization tank drops to 98.5 °C, absolutely The pressure is 423.5mmHg, and the preset program is automatically adjusted to reduce the pressure of the crystallization kettle at a speed of 2.3mmHg / min, while the temperature of the toluene solution of antimony triacetate in the kettle continues to decrease. Until there is obvious crystallization exotherm in the kettle,...

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Abstract

The invention relates to an extraction method of antimony triacetate. The extraction method of antimony triacetate comprises steps as follows: a toluene solution of antimony triacetate at the temperature of 113.5-118 DEG C is depressurized at the first speed, so that the temperature of the toluene solution of antimony triacetate is reduced to 98-99 DEG C; the toluene solution of antimony triacetate is continuously depressurized at the second speed until crystals release heat, and thermal insulation and pressure maintaining are performed for 15-20 min; the toluene solution of antimony triacetate is continuously depressurized at the third speed until the temperature of the toluene solution of antimony triacetate is 40-50 DEG C, and antimony triacetate is obtained through cooling and filtration, wherein the first speed is larger than the second speed, and the second speed is larger than the third speed. The antimony triacetate product obtained with the method has moderate granularity andcan be conveniently packaged and stored and rapidly dissolved during use.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a method for extracting antimony triacetate. Background technique [0002] Antimony triacetate is widely used in PET polyester production and other chemical production, requiring stable performance and convenient storage. Especially as a catalyst in the production process of PET polyester products, it requires fast dissolution and good dispersibility. Antimony triacetate products are generally produced by reacting antimony oxide with acetic anhydride in toluene solvent. Antimony triacetate is dissolved in toluene solvent. During the production process, antimony triacetate crystals need to be extracted from toluene solvent. [0003] The size of the crystal particles has an impact on the packaging, storage and use of the product. If the particle size of the product is too small, the product volume will be large, and more packaging box storage space is required, and the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C51/41C07C51/43C07C53/10
Inventor 易立群姚生蓬肖飞陈秀林
Owner MATRIX GUANGZHOU CHEM CORP