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Continuous synthesis method for polyether

A polyether and low molecular weight polyether technology, applied in the field of continuous synthesis of polyethers, can solve the problems of loss of activity, large tailing of small molecules, decreased activity of DMC, etc. The effect of low molecular tailing

Active Publication Date: 2014-03-26
LIMING RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this method just mixes DMC catalyst and initiator, and when using conventional small molecular alcohol initiator such as water, propylene glycol, glycerin etc., DMC contacts with it and easily causes the activity of DMC to reduce, even lose activity
Moreover, the method is a single-pot single-point feeding process, and the tailing of small molecules is relatively large

Method used

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  • Continuous synthesis method for polyether
  • Continuous synthesis method for polyether
  • Continuous synthesis method for polyether

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] In 5 liters of reactors 1, add the initiator 204 polyethers of 400g (the polyoxypropylene diol of two-functionality molecular weight 400, the same below) and 0.060gDMC catalyst, vacuum dry, slowly add 80g propylene oxide after drying completes, Maintain 130°C for induction reaction. When the temperature keeps rising and the pressure keeps falling, it indicates that the catalyst has been induced to activate. After the induction was completed, 1420 g of propylene oxide was continuously added to the reaction kettle 1 at a temperature of 0.2 MPa while maintaining 130° C. Then feed propylene oxide at a speed of 4500g / h, and simultaneously add 204 polyether and DMC catalyst in a ratio of 4:15:0.0006 by weight ratio of 204 polyether / propylene oxide / DMC. After the reactor 1 is full, the materials enter the reactor 2, maintain the temperature of the reactor 2 at 130° C., and the pressure at 0.2 MPa, and add propylene oxide to the reactor 2 at a feeding rate of 300 g / h. After t...

Embodiment 2

[0022] Add 800 g of initiator butyl polyether (molecular weight: 400) and 0.060 g of DMC catalyst to 5 liters of reactor 1, vacuum dry, slowly add 80 g of propylene oxide after drying, and maintain 120°C for induction reaction. When the temperature keeps rising and the pressure keeps falling, it indicates that the catalyst has been induced to activate. After the induction was completed, 720 g of propylene oxide was continuously added at 0.1 MPa while maintaining 120°C. Then pass into propylene oxide according to the speed of 1815g / h, be 0.74:7.26:0.0003 ratio to add n-butanol and DMC catalyst simultaneously by n-butanol / propylene oxide / DMC weight ratio. After the reactor 1 is full, the material enters the reactor 2, maintains the temperature at 120° C. and the pressure at 0.1 MPa, and feeds propylene oxide into the reactor 2 at a feed rate of 500 g / h. After the reactor 2 is full, the material is discharged continuously to obtain the butyl polyether product. The hydroxyl valu...

Embodiment 3

[0024] Add 400 g of allyl polyether (molecular weight: 400) and 0.060 g of DMC catalyst into 5 liters of reactor 1, vacuum dry, slowly add 80 g of propylene oxide after drying, and maintain 110° C. for induction reaction. When the temperature keeps rising and the pressure keeps falling, it indicates that the catalyst has been induced to activate. After the induction was completed, 1420 g of propylene oxide was continuously added at 0.3 MPa while maintaining 110°C. Then pass into propylene oxide according to the speed of 1842g / h, be 0.58: 18.42: 0.0006 ratio to add allyl alcohol and DMC catalyst simultaneously by allyl alcohol / propylene oxide / DMC weight ratio. After the reactor 1 is full, the material enters the reactor 2, maintains the temperature at 110°C and the pressure at 0.3MPa, and feeds propylene oxide into the reactor 2 at a rate of 100g / h. After the reactor 2 is full, the material is discharged continuously to obtain the allyl polyether product. The hydroxyl value o...

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Abstract

The invention discloses a continuous synthesis method for polyether. A double-kettle two-point mode is used to feed continuously, a reaction kettle 1 and a reaction kettle 2 are connected in series, a feed point is arranged on each of the two reaction kettles, an initiator, a DMC catalyst and an epoxyalkane compound are continuously added into the feed point of the reaction kettle 1 to synthesize the polyether with the molecular weight accounting for 50%-99% of the designed molecular weight, then the materials are continuously transferred to the reaction kettle 2 from the reaction kettle 1, the epoxyalkane compound is continuously added into the reaction kettle 2 to synthesize the polyether with the designed molecular weight. According to a product produced through the method, the macromolecule trailing is reduced, the low-molecular-weight trailing phenomenon is also remarkably improved, and the narrow molecular weight distribution is obtained.

Description

technical field [0001] The invention relates to a method for continuously synthesizing polyether, in particular to continuously preparing polyether with narrow molecular weight distribution by using a high-activity double metal cyanide complex catalyst. Background technique [0002] The process of continuously synthesizing polyether using double metal cyanide complex (DMC) catalyst is a new polyether synthesis process that continuously adds alkylene oxide compound, initiator and catalyst, and continuously derives polyether products. [0003] Patent document CN 1310998C discloses a continuous preparation method of polyethers. It is characterized in that it adopts the reaction device of multi-stage stirring and mixing tank to achieve the purpose of continuously synthesizing polyether polyol. But this method exists that the required reaction equipment is a multistage stirring mixing tank, and the reaction device is complicated. [0004] Patent document CN 101302287B discloses...

Claims

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Application Information

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IPC IPC(8): C08G65/28
Inventor 王文浩李新豪贾利亚高宝柱周集义姜万军刘锐杨宝山樊建璞牛胜男高雅谭世鼎张庆秋贾新岳超马少锋张宏伟罗海洲
Owner LIMING RES INST OF CHEM IND
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