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Method for preparing polyether glycol by liquefying starch

A polyether polyol and starch liquefaction technology, applied in the direction of organic chemistry, can solve the problems of low yield of liquefied products, high pressure resistance requirements of equipment, corrosion of metal reactors, etc., to solve environmental pollution and equipment corrosion and liquefaction. The effect of high rate and mild reaction conditions

Inactive Publication Date: 2013-07-10
CHANGCHUN UNIV OF TECH
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  • Application Information

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Problems solved by technology

In terms of catalysts, most of the catalysts currently use sulfuric acid or alkaline catalysts, which will cause serious corrosion to the metal reactor and pollute the environment. Some liquefaction processes need to be carried out under high temperature and high pressure, which consumes a lot of energy and requires equipment to withstand pressure. High, the yield of liquefied products is not high

Method used

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  • Method for preparing polyether glycol by liquefying starch
  • Method for preparing polyether glycol by liquefying starch
  • Method for preparing polyether glycol by liquefying starch

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 5-8

[0041] Example 5-8: Preparation of polyether polyols at different times

[0042] The raw material of embodiment 5-8 uses cornstarch, and all the other are respectively with embodiment 1-4. The liquefaction results are listed in Table 2.

[0043] serial number time / min Liquefaction % Hydroxyl value / mgKOH / g Example 5 20 97.5 180.1 Example 6 30 98.2 360.0 Example 7 35 97.8 240.6 Example 8 40 97.1 137. 5

[0044] Note: the obtained polyether polyol characterization method is exactly the same as that of Example 1-4, so it is omitted here.

Embodiment 9-13

[0045] Example 9-13: Preparation of polyether polyols with different ratios of liquefiers

[0046] Mung bean starch was used as the raw material in Examples 9-13, and the mass ratios of PEG200 and glycerin in the liquefier were 9:1, 7:3, 5:5, 3:7, and 1:9. The liquefaction results are listed in Table 3.

[0047] serial number PEG200: Glycerin Liquefaction % Hydroxyl value / mgKOH / g Example 9 9:1 96.2 124.5 Example 10 7:3 98.2 360.0 Example 11 5:5 97.4 123.4 Example 12 3:7 97.3 126.2 Example 13 1:9 97.1 128.5

[0048]Note: the obtained polyether polyol characterization method is exactly the same as that of Example 1-4, so it is omitted here.

Embodiment 14-16

[0049] Example 14-16: Preparation of polyether polyols with different amounts of liquefiers

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Abstract

The invention provides a method for preparing polyether glycol by liquefying starch. The method is a new process for preparing the polyether glycol by taking the starch as a raw material, mixed polyhydric alcohol as a liquefying agent and methanesulfonic acid as a catalyst. According to the invention, the environment-friendly catalyst methanesulfonic acid is firstly adopted; the liquefaction ratio achieves 98.2%, the hydroxyl value is 360.0 mgKOH / g and the viscosity is 725 mpa.s at the liquefaction temperature of 150-170 DEG C; and the prepared polyether glycol is suitable for preparing a foaming polyurethane material. The method provided by the invention has the characteristics of simple preparation process, low cost and available raw material, moderate reaction condition, low cost and the like and is a clean process for preparing the polyether glycol through the recyclable raw material starch.

Description

technical field [0001] The invention relates to a method for preparing polyether polyol by liquefaction of starch. Background technique [0002] Polyether polyol is an important chemical raw material, and its biggest use is to synthesize polyurethane resin products, such as polyurethane foam, polyurethane adhesive, polyurethane adhesive, polyurethane elastomer, etc. In addition, it can also be used as a nonionic surfactant, lubricant, etc. At present, the raw materials for producing polyether polyols are petrochemical products with strong toxicity and corrosiveness. In recent years, due to the rise of petroleum prices, the preparation cost of polyether polyols has also increased accordingly. At the same time, with the increasing shortage of petroleum resources and the increasingly serious environmental pollution, actively exploring renewable biomass as a raw material to replace petroleum resources is one of the effective ways to solve the problem, and it is being paid more ...

Claims

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Application Information

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IPC IPC(8): C08G65/36C08G18/48C07D455/03
Inventor 张龙刘杨郭志强
Owner CHANGCHUN UNIV OF TECH
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