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Extraction method of antimony triacetate

A technology of antimony triacetate and an extraction method, applied in the field of chemical industry, can solve the problems of large product volume, difficulty in controlling the particle size of antimony triacetate crystals, storage space in multiple packaging boxes and the like

Active Publication Date: 2018-01-26
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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  • Extraction method of antimony triacetate
  • Extraction method of antimony triacetate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The extraction process of antimony triacetate in this embodiment is specifically as follows:

[0043] The toluene solution of antimony triacetate at a temperature of 113.5°C was placed in the crystallization kettle with an absolute pressure of 760mmHg. Start the predetermined crystallization program on the PLC. Under the control of the crystallization program, reduce the pressure of the crystallization kettle at a speed of 5mmHg / min. At the same time, the temperature of the toluene solution of antimony triacetate in the crystallization kettle will decrease until the temperature of the crystallization kettle is reduced to 98℃, absolute pressure It is 415.5mmHg, the predetermined program is automatically adjusted to reduce the pressure of the crystallization kettle at a rate 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 t...

Embodiment 2

[0045] The extraction process of antimony triacetate in this embodiment is specifically as follows:

[0046] The toluene solution of antimony triacetate at a temperature of 118°C was placed in the crystallization kettle with an absolute pressure of 783.75 mmHg. Start the predetermined crystallization program on the PLC. Under the control of the crystallization program, reduce the pressure of the crystallization kettle at a speed of 6mmHg / min. At the same time, the temperature of the toluene solution of antimony triacetate in the crystallization kettle will decrease until the temperature of the crystallization kettle is reduced to 99℃, absolute pressure 431.25mmHg, the predetermined program is automatically adjusted to reduce the pressure of the crystallization kettle at a rate 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 th...

Embodiment 3

[0048] The extraction process of antimony triacetate in this embodiment is specifically as follows:

[0049] A toluene solution of antimony triacetate at a temperature of 115.2°C was placed in a crystallization kettle with an absolute pressure of 768.6 mmHg. Start the predetermined crystallization program on the PLC. Under the control of the crystallization program, reduce the pressure of the crystallization kettle at a speed of 5.5 mmHg / min. At the same time, the temperature of the toluene solution of antimony triacetate in the crystallization kettle will decrease until the temperature of the crystallization kettle is reduced to 98.5°C. Press 423.5mmHg, the predetermined program is automatically adjusted to reduce the pressure of the crystallization kettle at a rate of 2.3mmHg / min, while the temperature of the toluene solution of antimony triacetate in the kettle continues to decrease. Until a significant crystallization exotherm occurs in the kettle, the temperature of the tolu...

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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 engineering, 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, fast dissolution and good dispersibility are required. Antimony triacetate products are generally prepared by reacting antimony oxide with acetic anhydride in toluene solvent. Antimony triacetate is dissolved in toluene solvent. In the production process, the antimony triacetate crystals need to be extracted from the 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 and the product volume is large, more storage space in the packaging box is required, and th...

Claims

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Application Information

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IPC IPC(8): C07C51/41C07C51/43C07C53/10
Inventor 姚生蓬肖飞易立群陈秀林
Owner MATRIX GUANGZHOU CHEM CORP
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