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Bimetallic catalyst, preparation method and application thereof

A bimetallic catalyst and solvent technology, applied in the field of bimetallic catalyst and its preparation, can solve the problems of artificial addition, dust pollution, low functionality, etc., and achieve the effects of low unsaturation, narrow molecular weight distribution, and high catalytic efficiency

Inactive Publication Date: 2017-09-01
于天荣
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The polyether polyol prepared by using DMC bimetallic catalyst overcomes the disadvantages of wide molecular weight distribution and low functionality of general-purpose polyether prepared by traditional alkali catalyst. At present, the production technology of this new type of polyether catalyst in foreign countries has matured, and there are products on the market.
In recent years, research in this area has also started in China, but DMC catalysts are all solid, and they need to be added manually during the production process, resulting in dust pollution

Method used

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  • Bimetallic catalyst, preparation method and application thereof
  • Bimetallic catalyst, preparation method and application thereof
  • Bimetallic catalyst, preparation method and application thereof

Examples

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preparation example Construction

[0052] The preparation method of the above-mentioned bimetallic catalyst, the zinc raw material and the alkali are fully stirred and mixed uniformly in proportion, the cobalt raw material is added and the cobalt raw material is fully stirred and mixed uniformly, filtered and cleaned, the obtained solid is added to the ligand and stirred at a high speed, left standing, and added The solvent is fully stirred and dispersed uniformly to obtain a bimetallic catalyst.

[0053] The preparation method of the bimetallic catalyst of the invention has simple process, low energy consumption and is suitable for large-scale production.

[0054] In a preferred embodiment of the present invention, the stirring time for fully stirring and mixing the zinc raw material and the alkali is more than 10 minutes, preferably 15-30 minutes, and more preferably 20 minutes.

[0055] In a preferred embodiment of the present invention, the stirring time for the cobalt raw material to be fully stirred and m...

Embodiment 1

[0070] A preparation method of bimetallic catalyst, comprising:

[0071] Stir and drop the zinc chloride aqueous solution containing 20g of zinc chloride into the sodium hydroxide aqueous solution containing 0.5g of sodium hydroxide, and stir for 15min;

[0072] Then dropwise add potassium hexacyanocobaltate aqueous solution containing 20g potassium hexacyanocobaltate, and stir for 10min;

[0073] After vacuum filtration and cleaning, the obtained solid was added to 60 g of tert-butanol, and stirred for 30 min at a stirring rate of 6000 r / min;

[0074] After standing still for 24 hours, add 700g polyether 204, stir and shear emulsify for 10 minutes;

[0075] Dry and dehydrate under vacuum at 50°C to obtain a liquid bimetallic catalyst.

Embodiment 2

[0077] A preparation method of bimetallic catalyst, comprising:

[0078] Stir and drop the zinc chloride aqueous solution containing 40g of zinc chloride into the sodium hydroxide aqueous solution containing 5g of sodium hydroxide, and stir for 30min;

[0079] Then dropwise add the potassium hexacyanocobaltate aqueous solution containing 40g potassium hexacyanocobaltate, and stir for 30min;

[0080] After vacuum filtration and cleaning, the obtained solid was added to 80 g of tert-butanol, and stirred at 9000 r / min for 10 min;

[0081] After standing still for 60h, add 1000g polyether 305, stir and shear emulsify for 15min;

[0082] Dry and dehydrate under vacuum at 60°C to obtain a liquid bimetallic catalyst.

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Abstract

The invention provides a bimetallic catalyst, a preparation method and application thereof. According to the invention, a cobalt raw material, a zinc raw material and a ligand at a specific usage ratio are adopted for preparing a cobalt and zinc bimetallic catalyst, and furthermore, a solvent is adopted for preparing a liquid-phase bimetallic catalyst. The bimetallic catalyst provided by the invention is a liquid catalyst, can be conveniently added into a reaction system, can more effectively disperse in the reaction system and can fully promote the catalytic efficiency. The preparation method for the bimetallic catalyst provided by the invention is simple in process, low in energy consumption and suitable for large-scale production. The bimetallic catalyst provided by the invention is suitable for the preparation of polyether polyol; a polyether polyol product with narrow molecular weight distribution, low unsaturation degree and high molecular weight can be acquired; the dosage of the required bimetallic catalyst is less; the yield of the acquired polyether polyol product is high; the bimetallic catalyst provided by the invention need not be recycled and will not influence the property of the acquired polyether polyol product and subsequently prepared polyurethane product.

Description

technical field [0001] The invention relates to the technical field of industrial catalysis, in particular to a bimetallic catalyst and its preparation method and application. Background technique [0002] Polyether polyols are important raw materials for the polyurethane industry. There are three main types of catalysts for polyether production, anionic catalysts, cationic catalysts, and metal complex catalysts. Among them, the double metal cyanide complex catalyst (ie DMC bimetallic catalyst) has been a research hotspot in recent years because of its excellent performance. The polyether polyol prepared by using DMC bimetallic catalyst overcomes the shortcomings of wide molecular weight distribution and low functionality of the general-purpose polyether prepared by traditional alkali catalyst. At present, the production technology of this new polyether catalyst in foreign countries has matured, and there are products on the market. In recent years, research in this area ha...

Claims

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Application Information

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IPC IPC(8): C08G65/26
CPCC08G65/2651C08G65/266C08G65/2663
Inventor 于天荣张海菊
Owner 于天荣
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