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Catalyst system for preparing polyoxymethylene and preparation method of catalyst system

A technology of catalyst and polyoxymethylene, which is applied in the preparation of polyoxymethylene catalyst system and its preparation field. It can solve the problems of instability, pipeline blockage, polymerization, and precipitation, and achieve the effects of stable polymerization index, controllable flow rate and saving investment.

Active Publication Date: 2014-12-17
XINGTAI RISUN COAL CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the above problems, the present invention provides a catalyst system for preparing polyoxymethylene, which can avoid problems such as oily substance precipitation, pipeline blockage and polymerization instability during storage.

Method used

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  • Catalyst system for preparing polyoxymethylene and preparation method of catalyst system
  • Catalyst system for preparing polyoxymethylene and preparation method of catalyst system
  • Catalyst system for preparing polyoxymethylene and preparation method of catalyst system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The water content of the dioxane monomer was measured by JF-5 coulometric trace water analyzer to be 20ppm, and the purity of dioxane was measured by Agilent 7890A gas chromatograph to be 99.995%. Accurately weigh 100 g of dioxane on an electronic balance, and place the dioxane and boron trifluoride diethyl ether at the same time in the freezer, and adjust the temperature to -5 to 0°C for storage for 1 hour. Take the cooled boron trifluoride ether and dioxane out of the freezer, place them in a nitrogen-sealed glass cover, adjust the volume of the adjustable pipette to the position of 0.2g to extract boron trifluoride ether And added dropwise to the dioxane monomer. After the preparation is completed, the catalyst should be fully shaken evenly, and placed in the freezer (adjust the temperature to -10~-5°C) and normal temperature (15~25°C) respectively. The time taken to observe the change in fluidity of the catalyst solution.

[0033] Polymerization process: Blend the...

Embodiment 2

[0039]The JF-5 coulometric trace water analyzer is used to measure the trace water content to be 80ppm, and the Agilent 7890A gas chromatograph is used to measure the purity of dioxane to be 99.99%. Accurately weigh 100 g of dioxane on an electronic balance, and place the dioxane and boron trifluoride diethyl ether at the same time in the freezer, and adjust the temperature to -5 to 0°C for storage for 1 hour. Take the cooled boron trifluoride ether and dioxane out of the freezer, place them in a nitrogen-sealed glass cover, adjust the volume of the adjustable pipette to the position of 0.2g to extract boron trifluoride ether And added dropwise to the dioxane monomer. After the preparation is completed, the catalyst should be fully shaken evenly, and placed in the freezer (adjust the temperature to -10~-5°C) and normal temperature (15~25°C) respectively. The time taken to observe the change in fluidity of the catalyst solution.

[0040] The storage time and indicators of the...

Embodiment 3

[0045] The JF-5 coulometric trace water analyzer is used to measure the trace water content to be 20ppm, and the Agilent 7890A gas chromatograph is used to measure the purity of dioxane to be 99.995%. Accurately weigh 100 g of dioxane on an electronic balance, and place the dioxane and boron trifluoride diethyl ether at the same time in the freezer, and adjust the temperature to -5 to 0°C for storage for 1 hour. Take the cooled boron trifluoride ether and dioxane out of the freezer, place them in a nitrogen-sealed glass cover, and adjust the volume of the adjustable pipette to the position of 1.0g to extract boron trifluoride ether And added dropwise to the dioxane monomer. After the preparation is completed, the catalyst should be fully shaken evenly, and placed in the freezer (adjust the temperature to -10~-5°C) and normal temperature (15~25°C) respectively. The time taken to observe the change in fluidity of the catalyst solution.

[0046] The storage time and indicators ...

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Abstract

The invention relates to a catalyst system for preparing polyoxymethylene and a preparation method of the catalyst system. The catalyst system for preparing the polyoxymethylene comprises boron trifluoride diethyl etherate as a catalyst and dioxolane as a solvent, wherein the purity of dioxolane is larger than 99.99 percent, and the water content of dioxolane is below 80ppm. According to the catalyst system, based on 100 weight parts of dioxolane, the content of boron trifluoride diethyl etherate is 0.2-1 part; in addition, the catalyst system is stored at the temperature ranging from 10 DEG C below zero to 5 DEG C below zero.

Description

technical field [0001] The invention relates to a catalyst system and a preparation method thereof, in particular to a catalyst system for preparing polyoxymethylene and a preparation method thereof. Background technique [0002] The catalyst used in the production of polyformaldehyde is usually boron trifluoride ether complex. Since the amount of catalyst boron trifluoride ether is very small during the preparation process, the general amount is 30-150ppm of the polymerized monomer, which cannot be directly added to the reaction. used in the system. At present, cyclohexane is generally used as a solvent and boron trifluoride ether to prepare a catalyst solution, and there are trace impurities such as benzene, cyclohexene, and easily charred substances in cyclohexane, and cyclohexene in cyclohexane and boron trifluoride ether The boron trifluoride diethyl ether will undergo a chemical reaction, the ring of cyclohexene will be opened directly, and the chain growth will occur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G2/22C08G2/06
Inventor 张英伟吕新哲段胜利牛建波王成杨洪庆韩占一白冰石志哲王科
Owner XINGTAI RISUN COAL CHEM IND