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Purification method of polyether polyol with low degree of unsaturation

A polyether polyol and purification method technology, which is applied in the directions of ether separation/purification, ether preparation, organic chemistry, etc., can solve the problems of adverse effects of polyether polyols in later storage, influence on polyurethane products, and adverse polyurethane synthesis, and achieve adsorption Better results, simpler and more practical techniques, less time spent

Inactive Publication Date: 2013-05-08
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The added substances that can precipitate the catalyst, especially the alkaline substances, are extremely unfavorable to the synthesis of polyurethane in the later stage. They will react strongly with isocyanate and affect the quality of polyurethane products, and their residues will also bring harm to the later storage of polyether polyols. Negative Effects
Moreover, the separation process is more complex and cumbersome

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] (1) 60g of polyether polyols containing bimetallic catalysts are added into a three-necked flask;

[0015] (2) adding thereto again with the polyether polyol mass ratio in the there-necked flask is the functional fiber and activated clay mixture of 0.03;

[0016] (3) Place the three-neck flask containing the mixture of polyether polyol, functional fiber and activated clay adsorbent in a constant temperature water bath, heat it to 60°C under stirring with a D25-2 electric mixer, and adsorb at a constant temperature for 2 hours;

[0017] (4) Take the three-neck flask out of the water bath, pour its contents into the centrifuge rotor after cooling to room temperature, and centrifuge to obtain the target product of high-purity polyether polyol.

[0018] The separated product was detected by plasma emission spectrometry for the removal of the bimetallic catalyst in the polyether polyol by the adsorbent. The result was that the zinc content in the polyether polyol was 0.54×10...

Embodiment 2

[0020] Process step is identical with embodiment 1, difference is that the adsorbent that adds in (2) is the mixture of 1.2g functional fiber and 2.4g active carbon fiber, the mass ratio of adsorbent mixture and polyether polyol in step (1) is 0.06.

[0021] The separated product was detected by plasma emission spectrometry for the removal of the bimetallic catalyst in the polyether polyol by the adsorbent. The result was that the zinc content in the polyether polyol was 0.78×10 -6 , cobalt content is 0.60×10 -6 .

Embodiment 3

[0023] Process step is identical with embodiment 1, and difference is that the adsorbent that adds in (2) is the mixture of 3g activated clay and 3g activated carbon fiber, and the mass ratio of adsorbent mixture and polyether polyol in step (1) is 0.1 .

[0024] The separated product was detected by plasma emission spectrometry for the removal of the bimetallic catalyst in the polyether polyol by the adsorbent. The result was that the zinc content in the polyether polyol was 2.65×10 -6 , cobalt content is 1.24×10 -6 .

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PUM

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Abstract

The invention discloses a method for removing residual bimetallic catalyst in a polyether polyol product with low degree of unsaturation, which is characterized by adopting the adsorption method to remove the catalyst, and can greatly simplify the process flow, reduce impurities introduced into the product, realize high purification rate, improve the stability of late-stage storage of the polyether polyol with low degree of unsaturation, improve the product quality and be widely applied in the purification of the polyether polyol with low degree of unsaturation.

Description

technical field [0001] The invention relates to a separation method for removing residual catalysts in polyether products in the chemical industry, in particular to a method for purifying polyether polyols with low unsaturation. Background technique [0002] Low unsaturation polyether polyols generally use double metal cyanide complexes (DMC) as catalysts, polyols with a certain molecular weight as initiators, and are polymerized from propylene oxide or ethylene oxide. Although the amount of DMC catalyst used to produce low-unsaturation polyether is much less than that of traditional base-catalyzed processes, if not removed, the remaining catalyst will cause volatility of polyether polyol products during storage and transportation. substances, and cause side reactions when polyols react with isocyanic acid to produce polyurethane products. For example, the remaining catalyst promotes the formation of a large amount of allophanate, causing crosslinking or branching of the pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G65/30C07C43/11C07C41/36
Inventor 马卫华钟秦戚莉杨柳陈迁乔
Owner NANJING UNIV OF SCI & TECH
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