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Preparation of bimetal cyanide catalyst using acid treating metal salt

A technology of double metal cyanide and metal salt, which is applied in the field of acid treatment of metal salt to prepare double metal cyanide complex catalyst, can solve problems such as harm and does not involve downstream polyurethane products and the like

Inactive Publication Date: 2005-03-09
中国石化集团天津石油化工公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But how to deal with ZnCl with high alkalinity 2 It does not make any discussion, nor does it refer to ZnCl 2 Reasons for high alkalinity and the harm caused by high alkalinity to the quality of downstream polyurethane products

Method used

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  • Preparation of bimetal cyanide catalyst using acid treating metal salt
  • Preparation of bimetal cyanide catalyst using acid treating metal salt
  • Preparation of bimetal cyanide catalyst using acid treating metal salt

Examples

Experimental program
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example 1

[0042] Take industrial product ZnCl 2 330.1 grams, add 180.2 grams of deionized water, stir to dissolve, and make ZnCl 2 The aqueous solution was filtered to remove solid impurities, and its concentration was analyzed to be 63.40wt.%. Take the ZnCl 2 8.071 grams of aqueous solution, carry out potentiometric titration with 0.1N hydrochloric acid, use graph method to obtain equivalence point (PH=3.7), use the volume of dehydrochloric acid to be 23.60ml, measure its alkalinity value to be 1.88wt.%, this value On the high side and needs adjustment.

[0043] After setting the adjusted ZnCl 2 The alkalinity value of the aqueous solution is 0.60 wt.%. Take 450.5 grams of this solution, and calculate according to formula-1 that 9.40 ml of hydrochloric acid with a concentration of 9.6N needs to be added. Slowly add hydrochloric acid to the ZnCl with stirring 2 In the aqueous solution, stir evenly for 3 to 5 minutes after adding, take a sample and analyze the alkalinity to be 0.5...

example 2～4

[0046] The method preparation concentration by example 1 is that 62.3wt.% alkalinity 0.89wt.%, concentration are three kinds of ZnCl that 60.9wt.% alkalinity 1.6wt.% and concentration are 61.3wt.% alkalinity 1.9wt.% 2 aqueous solution. Prepare DMC-2 with the technique that example 1 adopts # 、3 # 、4 # catalyst. In the process of preparing the DMC catalyst, use the above three kinds of ZnCl with high basicity 2 When the aqueous solution is mixed with water and tert-butanol to prepare the reaction raw material liquid, different degrees of white precipitates are produced. with DMC-2 # 、3 # 、4 # Catalyst synthesis of PPG-3000, the method is the same as Example 1, the reaction data of PO are listed in Table-4, the catalyst activation time and the performance of the synthesized PPG-3000 are listed in Table-5.

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Abstract

A process for preparing high-activity bimetal cyanide as complexing catalyst from zinc chloride features that as said zinc chloride has higher basicity, it is treated by acid to regulate its basicity to optimal value and then is used to prepare said catalyst with higher activity, resulting in high quality of catalyzed product.

Description

technical field [0001] The invention belongs to a process method for preparing a double metal cyanide complex catalyst by treating a metal salt with an acid. Background technique [0002] Double metal cyanide (DMC) complex catalysts have been widely used in the polymerization of epoxides. Compared with alkali catalysts, DMC catalysts inhibit the disproportionation of propylene oxide (PO), and catalyze the synthesis of polyether polyols with low unsaturation, low unit alcohol content, and narrow molecular weight distribution, which improves the quality of downstream polyurethane products. The activity of DMC catalyst is extremely high, and the usage amount is about 25ppm. It is not necessary to remove it from the product polyol, and eliminates the post-treatment procedures such as neutralization and filtration in the alkali-catalyzed process, simplifies the production process, and reduces the product cost. [0003] Since the American General Rubber Company first applied for ...

Claims

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Application Information

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IPC IPC(8): B01J27/26C08G65/00
Inventor 张岱山陆杲胡慧明王凤琴张筱媛
Owner 中国石化集团天津石油化工公司
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