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Reaction system and method for preparing polyether polyol

A technology of polyether polyol and reaction system, which is applied in the field of reaction system and preparation of polyether polyol synthesized by alkali-catalyzed process, can solve the problems of many residual small molecular substances, low conversion rate of raw materials, wide molecular weight distribution, etc., and achieve reduction The side reaction occurs, the effect of increasing the reaction rate and reducing the degree of unsaturation of the product

Active Publication Date: 2019-03-01
WANHUA CHEM GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is to solve the problems of long reaction period, low conversion rate of raw materials, many residual small molecular substances in the product, high degree of unsaturation and wide molecular weight distribution in the base-catalyzed synthesis of polyether polyol, and provide a polyether polyol The reaction system and preparation method of

Method used

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  • Reaction system and method for preparing polyether polyol
  • Reaction system and method for preparing polyether polyol
  • Reaction system and method for preparing polyether polyol

Examples

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Effect test

Embodiment 1

[0090] The volume of the reaction kettle is 8L, the Monel 600 mixed with 400ppm cerium oxide is sprayed inside the selected static mixer, the height a=9 of the nozzle of the liquid phase jet mixer at the bottom of the tank, degrees, θ=15 degrees.

[0091] (1) inject respectively the aqueous potassium hydroxide solution of 197g glycerol and 30g49wt% of reactor from starter feed port 8 and catalyst feed port 9;

[0092] (2) Close the feed valve, feed nitrogen to 0.2MPa from the nitrogen feed port 12, then evacuate to -0.08MPa from the vacuum outlet 10, and replace 3 times;

[0093] (3) After the replacement is completed, open the external circulation pump 2 and begin to circulate through the external circulation pipeline 15 on the top of the kettle. The flow rate of the external circulation pump 2 is 75L / h, and it is heated through the heating heat exchanger 4. Nitrogen feed port 12 is fed with nitrogen gas at 50mL / min, vacuum is drawn from vacuum outlet 10 to -0.08MPa, the te...

Embodiment 2

[0101] The volume of the reaction kettle is 8L, the Monel 600 mixed with 400ppm cerium oxide is sprayed inside the selected static mixer, the height a=6 of the nozzle of the liquid phase jet mixer at the bottom of the tank, degrees, θ=20 degrees.

[0102] (1) inject respectively the aqueous potassium hydroxide solution of 197g glycerol and 30g49wt% of reactor from starter feed port 8 and catalyst feed port 9;

[0103] (2) Close the feed valve, feed nitrogen to 0.2MPa from the nitrogen feed port 12, then evacuate to -0.08MPa from the vacuum outlet 10, and replace 3 times;

[0104] (3) After the replacement is completed, open the external circulation pump 2 and begin to circulate through the external circulation pipeline 15 on the top of the kettle. The flow rate of the external circulation pump 2 is 80L / h, and it is heated through the heating heat exchanger 4. Nitrogen feed port 12 feeds nitrogen gas at 70mL / min, vacuumizes to -0.09MPa from vacuum outlet 10, and maintains the...

Embodiment 3

[0112] The volume of the reaction kettle is 8L, the Monel 600 mixed with 800ppm cerium oxide is sprayed inside the selected static mixer, the height a=7 of the nozzle of the liquid phase jet mixer at the bottom of the tank, degrees, θ=10 degrees.

[0113] (1) inject respectively the aqueous potassium hydroxide solution of 197g glycerol and 30g49wt% of reactor from starter feed port 8 and catalyst feed port 9;

[0114] (2) Close the feed valve, feed nitrogen to 0.2MPa from the nitrogen feed port 12, then evacuate to -0.08MPa from the vacuum outlet 10, and replace 3 times;

[0115] (3) After the replacement is completed, open the external circulation pump 2 and begin to circulate through the external circulation pipeline 15 on the top of the kettle. The flow rate of the external circulation pump 2 is 68L / h, and it is heated through the heating heat exchanger 4. Nitrogen feed port 12 feeds nitrogen gas at 30mL / min, vacuumizes to -0.08MPa from vacuum outlet 10, and maintains the...

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Abstract

The invention discloses a reaction system and method for preparing polyether polyol. The reaction system comprises a reaction kettle main body and a static mixer, wherein a kettle top distributor anda kettle bottom liquid-phase jet mixer are mounted in a reaction kettle; preferably, the inner surface of the static mixer is sprayed with a Monel alloy doped with 1 to 1000 ppm of cerium oxide. A flow ratio of the kettle top distributor and the kettle bottom liquid-phase jet mixer in a reaction process is controlled, so that the gas-liquid mixing effect is enhanced, the impurity removal efficiency is improved and the reaction speed is increased; the problems of a current process of catalytically synthesizing the polyether polyol through alkali that the reaction period is long, the conversionrate of raw materials is low, more small molecular substances are remained in a product, the unsaturation degree is high and the molecular weight distribution is wide are solved; the production safetyis improved.

Description

technical field [0001] The invention relates to a reaction system and a preparation method for preparing polyether polyols, in particular to a reaction system and a preparation method for synthesizing polyether polyols by an alkali-catalyzed process. technical background [0002] Polyether polyol is an important chemical raw material, which is widely used in printing and dyeing, synthetic leather, coating, polyurethane and nonionic surfactant and other fields. Especially in the polyurethane industry, as people's requirements for the performance of polyurethane products continue to improve, the market's requirements for the performance of polyether polyols are also getting higher and higher. And with the continuous narrowing of the price gap between raw material propylene oxide and polyether polyol and the continuous improvement of environmental protection requirements, the conversion rate of propylene oxide (ethylene) required for the synthesis of polyether polyol is also ge...

Claims

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Application Information

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IPC IPC(8): C08G65/28
CPCC08G65/2609C08G65/2696
Inventor 陈迎来叶建初张坤徐丹张宏科华卫琦
Owner WANHUA CHEM GRP
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