Preparation method of propylene glycol polyoxypropylene ether

A technology of propylene glycol polyoxypropylene ether and propylene glycol, which is applied in the field of preparation of polyoxypropylene ether, can solve the problems of difficulty in increasing the molecular weight, increase of unsaturation, poor refining effect, etc., and achieve small molecular weight distribution coefficient and narrow molecular weight distribution , good viscosity controllability

Inactive Publication Date: 2020-02-18
ZHEJIANG HUANGMA NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, under alkaline and high temperature conditions, propylene oxide will undergo a chain transfer reaction to produce 2-propenol or 1-propenol with unsaturated double bonds, thereby increasing the degree of unsaturation, and the obtained produ...

Method used

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  • Preparation method of propylene glycol polyoxypropylene ether
  • Preparation method of propylene glycol polyoxypropylene ether

Examples

Experimental program
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Effect test

Embodiment 1

[0026] A kind of preparation method of propylene glycol polyoxypropylene ether, comprises the steps:

[0027] S1: Add 200g of anhydrous propylene glycol to the reactor, BF 3 4.6g and 1.22g deionized water, pass N 2 After completely replacing the air in the closed reactor, close the reactor and then raise the temperature;

[0028] S2: Put 1129g of propylene oxide into the reaction kettle, and continue to heat up, wait until the temperature in the reaction kettle rises to 70°C, keep warm and carry out the reaction, until the pressure in the reaction kettle drops to the point where it cannot be lowered;

[0029] S3: Connect the vacuum pump to the reactor, turn on the vacuum pump to evacuate, remove the low boilers in the reactor, and obtain the propylene glycol oligomer intermediate.

[0030] S4: In another reactor, add 500g of the propylene glycol oligomer intermediate that S2 makes, DMC catalyst 0.08g, logical N 2 Replace the air in the reactor until the vacuum in the react...

Embodiment 2

[0032] A preparation method of propylene glycol polyoxypropylene ether, comprising the following steps:

[0033] S1: Add 200g of anhydrous propylene glycol and BF to the reactor 3 1.8g, through N 2 After completely replacing the air in the closed reactor, close the reactor and then raise the temperature;

[0034] S2: Put 1642g of propylene oxide into the reaction kettle, and continue to heat up, wait until the temperature in the reaction kettle rises to 70°C, keep warm for the reaction, and wait until the pressure in the reaction kettle drops to the point where it cannot be lowered;

[0035] S3: Connect the vacuum pump to the reactor, turn on the vacuum pump to evacuate, remove the low boilers in the reactor, and obtain the propylene glycol oligomer intermediate.

[0036] S4: In another reactor, add 700g of propylene glycol oligomer intermediate that S2 makes, DMC catalyst 0.10g, logical N 2 Replace the air in the reactor until the vacuum in the reactor is ≤-0.095MPa, clos...

Embodiment 3

[0038] A preparation method of propylene glycol polyoxypropylene ether, comprising the following steps:

[0039] S1: Add 200g of anhydrous propylene glycol, SbCl 5 3.7g and Ph 3 CCl 3.5g, through N 2 After completely replacing the air in the closed reactor, close the reactor and then raise the temperature;

[0040] S2: Put 1642g of propylene oxide into the reaction kettle, and continue to heat up, wait until the temperature in the reaction kettle rises to 30°C, keep warm and carry out the reaction, until the pressure in the reaction kettle drops to the point where it cannot be lowered;

[0041] S3: Connect the vacuum pump to the reactor, turn on the vacuum pump to evacuate, remove the low boilers in the reactor, and obtain the propylene glycol oligomer intermediate.

[0042] S4: In another reactor, add 500g of the propylene glycol oligomer intermediate that S2 makes, DMC catalyst 0.13g, logical N 2 Replace the air in the reactor until the vacuum in the reactor is ≤-0.095M...

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Abstract

The invention provides a preparation method of propylene glycol polyoxypropylene ether. The preparation method comprises the following steps: preparing a propylene glycol oligomer intermediate from propylene glycol, and reacting the propylene glycol oligomer intermediate with propylene oxide to prepare the high-quality propylene glycol polyoxypropylene ether. Tthe preparation method can effectively reduce the color and luster of the product, shorten the production period, improve the transparency of the product and reduce the molecular weight distribution.

Description

technical field [0001] The invention relates to the technical field related to the preparation of polyoxypropylene ether, in particular to a preparation method of propylene glycol polyoxypropylene ether. Background technique [0002] Propylene glycol polyoxypropylene ether is widely used in the modern chemical industry and food processing industry. For example, propylene glycol polyether modified polyurethane materials with low unsaturation are often used in industry, and are often used in surfactants and demulsifiers. In the preparation of food processing industry, the United States took the lead in using the hydrophobicity of propylene glycol polyoxypropylene ether to enhance the loose taste and shelf life of bread. [0003] The one-step method commonly used in the industry to prepare propylene glycol polyoxypropylene ether with a molecular weight greater than 2000 molecular weight is to use a basic catalyst to catalyze the preparation of propylene glycol polyoxypropylene ...

Claims

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Application Information

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IPC IPC(8): C08G65/28
CPCC08G65/2609C08G65/2654C08G65/266C08G65/2663C08G65/2684C08G65/269C08G65/2696
Inventor 刘鹏飞马定连金一丰宿颜彬王俊
Owner ZHEJIANG HUANGMA NEW MATERIALS TECH CO LTD
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