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Method for simultaneously preparing polytetramethylene ether glycol with various specifications

A technology of polytetramethylene ether glycol and specifications, which is applied in the field of preparation of polytetramethylene ether glycol, can solve the problems of inability to produce PTMEG of various specifications at the same time, reduce waste of transition materials and improve The effect of production efficiency

Active Publication Date: 2019-06-07
杭州三隆新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for simultaneously preparing polytetramethylene ether glycol of multiple specifications, which solves the problem that the existing polytetramethylene ether glycol preparation method cannot simultaneously produce PTMEG of multiple different specifications. Defects

Method used

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  • Method for simultaneously preparing polytetramethylene ether glycol with various specifications
  • Method for simultaneously preparing polytetramethylene ether glycol with various specifications
  • Method for simultaneously preparing polytetramethylene ether glycol with various specifications

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Effect test

Embodiment 1

[0034] As shown in accompanying drawing 01, the present invention discloses a method for simultaneously preparing polytetramethylene ether glycol of various specifications, comprising:

[0035] 1) Add tetrahydrofuran with a liquid level of about 30% into the reactor R1, and then add a certain amount of heteropoly acid catalyst. The amount of catalyst added is based on actual needs, and the amount of catalyst can be controlled at 20% of the entire reaction liquid. When adding the heteropolyacid catalyst and tetrahydrofuran into R1, tetrahydrofuran should be added first, and then the catalyst should be added, and the catalyst should be added while stirring. The temperature of the reaction kettle was controlled at 50°C; the catalyst was stirred for 3 hours to completely dissolve the catalyst.

[0036] 2) When the stirring is stopped, the catalyst settles in the lower part of the reactor R1, forming an obvious lower catalyst phase and an upper organic phase. Replace the organic p...

Embodiment 2

[0043] The invention discloses a method for simultaneously preparing polytetramethylene ether glycol of various specifications, comprising:

[0044] 1) Add tetrahydrofuran with a liquid level of about 30% into the reaction kettle R1, and then add a certain amount of heteropoly acid catalyst. The amount of catalyst added is based on actual needs. In this example, the amount of catalyst is controlled at 33% of the entire reaction liquid . When adding the heteropolyacid catalyst and tetrahydrofuran into R1, tetrahydrofuran should be added first, and then the catalyst should be added, and the catalyst should be added while stirring. The temperature of the reaction kettle was controlled at 55° C. and stirred for 5 hours to completely dissolve the catalyst.

[0045] 2) When the stirring is stopped, the catalyst settles in the lower part of the reactor R1, forming an obvious lower catalyst phase and an upper organic phase. Replace the organic phase in the reactor R1 with tetrahydro...

Embodiment 3

[0051] The invention discloses a method for simultaneously preparing polytetramethylene ether glycol of various specifications, comprising:

[0052] 1) Add tetrahydrofuran with a liquid level of about 30% into the reactor R1, and then add a certain amount of heteropoly acid catalyst. The amount of catalyst added is based on actual needs, and the amount of catalyst can be controlled at 45% of the entire reaction liquid. When adding the heteropolyacid catalyst and tetrahydrofuran into R1, tetrahydrofuran should be added first, and then the catalyst should be added, and the catalyst should be added while stirring. The temperature of the reaction kettle was controlled at 50° C.; it was stirred for 4 hours to completely dissolve the catalyst.

[0053] 2) When the stirring is stopped, the catalyst settles in the lower part of the reactor R1, forming an obvious lower catalyst phase and an upper organic phase. Replace the organic phase in the reactor R1 with tetrahydrofuran (moisture...

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Abstract

The invention discloses a method for simultaneously preparing polytetramethylene ether glycol with various specifications. The method comprises the following steps: 1) adding tetrahydrofuran, then adding a heteropolyacid catalyst, and carrying out stirring and mixing for a reaction for 3-5 hours; 2) stopping stirring, carrying out standing to obtain a lower-layer catalyst phase and an upper-layerorganic phase, and replacing the upper-layer organic phase by tetrahydrofuran with a water content of less than 0.1%, so that the specific gravity of the heteropolyacid catalyst in the organic phase is adjusted to 1.8-2.0 g / cm<3>; 3) continuously introducing tetrahydrofuran, and after the reaction kettle is full of the polymerization liquid in, feeding the polymerization liquid into a sedimentation separation tank; 4) carrying out sedimentation for 1-3 hours in the sedimentation separation tank, and inputting the reaction liquid subjected to sedimentation separation into a tetrahydrofuran distillation tower; 5) adding an extracting agent and the reaction liquid subjected to sedimentation separation into a tetrahydrofuran distillation tower for carrying out mixing extraction; and 6) conveying the mixed liquid subjected to extraction to a polymer separator for separation. According to the preparation method disclosed by the invention, polytetramethylene ether glycol with different specifications can be prepared at a same time.

Description

technical field [0001] The invention relates to the field of preparation methods of polytetramethylene ether glycol, in particular to a method for simultaneously preparing polytetramethylene ether glycol of various specifications. Background technique [0002] Polytetramethylene ether glycol (PTMEG), also known as polytetrahydrofuran, tetrahydrofuran homopolymer, etc., is a widely used main raw material for the manufacture of elastomer materials such as case fibers, TPU, and microfibers. PTMEG is present as a soft segment of the aforementioned elastomeric material. Regarding the preparation method of PTMEG, there are many methods disclosed at present, and the route mainly includes 1. Fluorosulfonic acid method. 2. Acetic anhydride-perchloric acid method. 3. Concentrated sulfuric acid method. 4. Clay method. 5. Solid acid method. 6. Heteropoly acid algorithm, etc. [0003] For example, Chinese Patent No. CN00811571.0 discloses a polyoxytetramethylene glycol and a produc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/20C08G65/30
CPCY02P20/584
Inventor 易杰施可彬
Owner 杭州三隆新材料有限公司
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