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Process for rapid activation of double metal cyanide catalysts

A catalyst and epoxide technology, which is applied in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems such as increase in reaction temperature, and achieve the effect of low viscosity and low unsaturation

Inactive Publication Date: 2000-07-12
科思创股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, an increase in the reaction temperature can only be carried out in a marginal range without detrimental effects on the quality of the polyol

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-12

[0027] Improved effect of stripping on catalyst activation

[0028] These examples show that the use of an inert gas in combination with vacuum stripping is more effective for activating double metal cyanide catalysts than conventional vacuum stripping or no stripping at all. The method of the present invention is very suitable for the activation of various DMC catalysts described in the prior art. For example, the method can handle complexing agents (glyme, tert-butanol) in various catalysts as well as polyether-containing catalysts. The method can also handle powder catalysts and paste catalysts. The results are shown in Table 1.

Embodiment 13-16

[0030] Improved stripping effect on initial catalyst activity

[0031] As shown by the results in Table 2, stripping under vacuum with a nitrogen purge had a significant effect on the initial catalyst activity. This effect is almost equivalent to 400 mol.wt. diol or 700 mol.wt. triol feedstock.

Embodiment 17-17

[0033] Improving the effect of steam stripping on polyol properties

[0034] These examples show that the use of an inert gas in combination with vacuum stripping results in polyols having improved physical properties compared to polyols prepared using conventional vacuum stripping or no stripping at all. As shown in the results in Table 3, vacuum stripping assisted by nitrogen purge resulted in faster initiation of the catalyst, lower polyol viscosity, narrower molecular weight distribution (M w / M n ) and lower unsaturation.

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PUM

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Abstract

The invention discloses a method for activating double metal cyanide catalysts. The polyol feedstock or polyol feedstock / catalyst mixture is heated under vacuum under conditions effective to achieve improved stripping over that achievable by conventional vacuum stripping methods. Combining vacuum stripping with an inert gas purge or stripping in the presence of an organic solvent results in a feedstock / catalyst mixture that is usually rapidly activated in epoxide polymerization. Rapid activation results in more reliable starts and reduces cycle times. The polyols obtained by this process have lower viscosity, lower polydispersity and lower unsaturation for better polyurethanes.

Description

field of invention [0001] This invention relates to double metal cyanide (DMC) catalysts. More particularly, the present invention relates to a process for stripping a polyol starter or a mixture of a polyol starter and a DMC catalyst to prepare a catalyst for epoxide polymerization. Improved stripping methods allow rapid catalyst activation and / or improve polyols and polyurethanes. Background of the invention [0002] Double metal cyanide (DMC) complexes are well known catalysts for the polymerization of epoxides and the synthesis of polyether polyols. This catalyst was discovered in the 60's (see US Patents 3,278,459 and 3,829,505). In recent years, due to the commercial production of polyether polyols, improvements in DMC catalysts have been noticed (see US Pat. Nos. 5,158,922, 5,426,081, 5,470,813 and 5,482,908). Compared with conventional KOH catalysts, DMC catalysts allow rapid polymerization of epoxides, thereby reducing cycle times for polyol production. In addit...

Claims

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Application Information

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IPC IPC(8): C08G65/10B01J27/26C08G65/26
CPCC08G65/2663B01J27/26C08G65/2696
Inventor J·E·哈耶斯L·J·郎斯多尔夫B·H·伊萨尔斯F·J·阿梅利尼
Owner 科思创股份有限公司
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