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Method for preparing glyceryl polyether glycol

A technology of glyceryl polyether and polyol, which is applied in the field of preparation of polyether polyol for polyurethane foam, can solve problems such as difficulty in direct utilization and poor sales, and achieve the effects of cheap raw materials, good product performance and simple method

Inactive Publication Date: 2010-08-11
JURONG NINGWU CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the expansion of biodiesel production scale, more and more by-product glycerol is obtained. Since this type of glycerin contains more NaCl and water, it is difficult to use directly, so it is not only cheap, but also has a poor market.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Refined glycerol 33%, sorbitol 67% as co-initiator, catalyst is dimethylamine (40% aqueous solution) is 3% of co-initiator total amount, add in the reactor together, heat up, when temperature reaches 95 ℃ Begin to add propylene oxide, the addition of propylene oxide is 2.8 times of the total weight of co-initiator, because of exothermic reaction, control temperature must not exceed 135 ℃, and pressure is controlled below 0.5MPa. After adding propylene oxide, keep the reaction temperature for 2 hours to make the reaction fully proceed, then degas for 20 minutes, and filter to obtain glycerol-sorbitol polyoxypropylene ether with an average molecular weight of 500.

Embodiment 2

[0026] With refined glycerin 5%, sucrose 60%, propylene glycol 25%, toluenediamine 10% as co-initiator, trimethylamine (40% aqueous solution) as catalyzer, the amount of catalyzer is 5% of co-initiator total amount, add In the reactor, when the temperature rises to 100°C, start to add propylene oxide. The amount of propylene oxide added is 3 times the total weight of the co-initiator. Due to the exothermic reaction, the temperature must not exceed 155°C, and the pressure should be controlled below 0.5MPa . After the addition of propylene oxide, keep the reaction temperature for 1.5 hours to fully proceed the reaction, then degas for 3 hours, and filter to obtain glycerol-sucrose polyoxypropylene ether with an average molecular weight of 600.

Embodiment 3

[0028] Refined glycerin is used as initiator, and potassium hydroxide is used as catalyst, and the amount of catalyst is that 0.2% of the total amount of initiator is added in the reactor, the temperature rises, and when the temperature reaches 100° C., propylene oxide is added, and the amount of propylene oxide added is 2 times the total weight of the starter, due to the exothermic reaction, the controlled temperature shall not exceed 135°C, and the pressure shall be controlled below 0.5MPa. After the addition of propylene oxide, keep the reaction temperature for 2 hours to make the reaction fully proceed, then refine and filter to obtain glycerin polyoxypropylene ether with an average molecular weight of 200.

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Abstract

The invention discloses a method for preparing glycerol-based polyether polyol. Firstly, crude glycerol, a by-product of biodiesel, is refined to obtain refined glycerol which is used as an initiator together with other low-molecular-weight polyol and amines or used as the initiator alone; and with the existence of an alkaline catalyzer, the refined glycerol is reacted with oxidized alkene to obtain the polyether polyol. In the invention, the crude glycerol, the by-product of the biodiesel, is used as the raw material for producing the polyether polyol, thus having low cost, good product properties and being capable of meeting the requirements of producing polyurethane materials.

Description

technical field [0001] The invention relates to a method for preparing polyether polyol for polyurethane foam, in particular to a method for preparing glycerin-based polyether polyol by using crude glycerol, a by-product of biodiesel preparation. Background technique [0002] With the increasingly serious global energy shortage and environmental deterioration, controlling the exhaust emissions of fuel vehicles and protecting the natural environment has become an urgent problem for human beings to solve. Biodiesel is an oxygen-containing clean fuel. As a substitute for high-quality diesel oil, it is an environmentally friendly green fuel with far-reaching economic and social benefits. Therefore, it has attracted more and more attention from all countries in the world, and its output has also increased sharply. [0003] The most widely used biodiesel production method today is the alcoholysis of vegetable oils, and the main by-product produced in the alcoholysis process is gly...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G65/28C08G18/48
Inventor 应军翟洪金应珏
Owner JURONG NINGWU CHEM
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