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Production method of low molecular weight polyether polyol

A low-molecular-weight polyether, production method technology, applied in ether preparation, alkylene oxide preparation ether, organic chemistry and other directions, can solve the problems of pollution, low product yield, etc., and achieve the effect of improving the ammoniation rate

Active Publication Date: 2018-12-11
扬州晨化新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] When polyether polyols with low molecular weight (the molecular weight of 2 hydroxyl groups are 220-240, and the molecular weight of 3 hydroxyl groups are 420-440) are prepared by this method, due to the wide molecular weight distribution, there will be polyether polyols with a lower molar number. ; and because there is a chain break when low molecular weight polyetheramine is synthesized, polyether polyols with lower molar numbers will be removed after hydrogenation, which will not only cause pollution, but also cause low product yield

Method used

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  • Production method of low molecular weight polyether polyol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Polyether polyol synthesis:

[0024] Put 1000kg of propylene glycol and 30kg of catalyst polyetheramine D-230 into a clean external circulation reactor, and dehydrate at 80°C and -0.098MPa. Propylene oxide is then polymerized at a temperature of 130-140°C and a pressure of ≤0.2MPa. After the addition of 2026kg of propylene oxide is completed, it is aged for 1 hour and then cooled to below 60°C. A hydroxy polyether polyol.

[0025] (2) Application:

[0026] The polyether polyol containing 2 hydroxyl groups prepared in the above Example 1 (gas chromatography detection: content of dipropylene glycol 0.82%; content of tripropylene glycol and tetrapropylene glycol 89.52%, other components 9.66%) and liquid ammonia After spraying and mixing evenly, it is mixed with hydrogen, and then undergoes hydrogenation reaction in a fixed-bed reactor containing a skeleton nickel catalyst to obtain polyetheramine D-230. The amine value of polyetheramine D-230 was detected to be 8.3...

Embodiment 2

[0028] (1) Polyether polyol synthesis

[0029] Put 1000kg of propylene glycol and 450kg of catalyst polyetheramine D-230 into a clean external circulation reactor in sequence, dehydrate under the conditions of 80°C and -0.098MPa, when the moisture content is ≤0.05%, replace with nitrogen three times, and add propylene oxide continuously Polymerization is carried out at a temperature of 110-120°C and a pressure of ≤0.2MPa. After adding 2026kg of propylene oxide, after aging for 1 hour and then cooling down to below 60°C, the material is discharged to directly obtain a polyether polyol with a molecular weight of 230 and containing 2 hydroxyl groups. .

[0030] (2) Application

[0031] The polyether polyol containing 2 hydroxyl groups obtained in the above-mentioned Example 2 (gas chromatography detection: content of dipropylene glycol 0.91%; content of tripropylene glycol and tetrapropylene glycol 86.11%, other components 12.98%) and liquid ammonia After spraying and mixing ev...

Embodiment 3

[0033] (1) Synthesis of 3 hydroxyl polyether polyols

[0034] Put 642kg of glycerol and 150kg of catalyst polyetheramine T-403 into a clean external circulation reactor in turn, dehydrate under the conditions of 80°C and -0.098MPa, when the moisture content is ≤0.05%, replace with nitrogen three times, and continuously add epoxy Propane is polymerized at a temperature of 120-130°C and a pressure of ≤0.2MPa. After adding 2358kg of propylene oxide, after aging for 1 hour and then cooling down to below 60°C, the material is discharged to directly obtain a polyether polyether compound with a molecular weight of 430 and containing 3 hydroxyl groups. alcohol.

[0035] (2) Application

[0036] The polyether polyol containing 3 hydroxyls and liquid ammonia prepared in the above example 3 are uniformly mixed by spraying and then mixed with hydrogen, and then hydrogenation reaction occurs in a fixed-bed reactor containing a skeleton nickel catalyst to obtain polyetheramine T-403. The...

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Abstract

The invention relates to a method for producing low molecular weight polyether polyol, and belongs to the technical field of synthesis of polyether compounds in organic chemistry. The method comprises the following steps: putting propanediol, glycerol or trimethylolpropane and low molecular weight polyether amine into a reaction kettle, replacing with a nitrogen gas for three times after dehydration, and then adding propylene oxide; then subjecting to a polymerization reaction; after the reaction is finished, discharging after aging and cooling to obtain the low molecular weight polyether polyol. The low molecular weight polyetheramine is used as a catalyst, so the problem that hazardous wastes containing inorganic salts are generated by refining crude products in the production of traditional polyether polyol is avoided. The low molecular weight target product polyetheramine is used as the catalyst of the raw material polyether polyol, so that the residual catalyst in the polyether polyol does not affect the further amination of the polyether polyol in the production of polyetheramine and helps increase the amination rate of the polyether polyol.

Description

technical field [0001] The invention belongs to the technical field of synthesis of polyether compounds in organic chemistry, and in particular relates to the preparation technology of polyether polyol suitable for preparing low-molecular-weight polyetheramine. Background technique [0002] Polyetheramine (PEA) is a kind of polymer whose main chain is polyether structure and the terminal active functional group is amine group. Polyetheramine is obtained by ammoniation of polyether polyol as raw material under high temperature and high pressure. By selecting different polyoxyalkylene structures, a series of properties such as reactivity, toughness, viscosity and hydrophilicity of polyetheramine can be adjusted, and the amine group provides the possibility of polyetheramine reacting with various compounds. [0003] A series of amine compounds can be prepared by subjecting polyether polyols containing terminal hydroxyl groups to hydrogenation (amine) reaction, which can be wid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C43/13C07C41/03
CPCC07C41/03C07C43/135
Inventor 董晓红房连顺张秀英郝大举
Owner 扬州晨化新材料股份有限公司
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