A kind of continuous synthesis method of polyether

A synthesis method and polyether technology are applied in the field of continuous synthesis of polyethers prepared from small molecular alcohols as starting agents, and can solve problems such as wide molecular weight distribution of polyethers

Active Publication Date: 2016-06-01
LIMING RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a wide molecular weight distribution of polyether, and it is necessary to use low molecular weight polyether polyol as a starter

Method used

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  • A kind of continuous synthesis method of polyether
  • A kind of continuous synthesis method of polyether

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Add 600g of 204 polyether and 0.09g of DMC catalyst into a 5L reaction kettle with an external circulation feeding pipe, replace with nitrogen three times, vacuumize and raise the temperature to 130°C, then pressurize to 0.000MPa and feed 120g of propylene oxide until the pressure drops significantly 1. When the temperature rises rapidly, it indicates that the DMC catalyst has been induced, and when the pressure drops below 0.003MPa, it indicates that the induction is over. Keep the temperature of the reactor at 140° C., and then continuously feed 2280 g of propylene oxide. Then continuously add the mixture of propylene glycol and propylene oxide (propylene glycol / propylene oxide weight ratio=72: 1928) in the reactor with the speed of 5000g / h, simultaneously DMC catalyst and 220 polyether carrier (in terms of carrier DMC concentration is 1500ppm ) is added continuously through the external circulation pipeline at a speed of 100g / h. Keep the pressure of the reactor at 0...

Embodiment 2

[0028] Add 400g of butyl polyether (molecular weight: 400) and 0.06g of DMC catalyst to a 5L reaction kettle with an external circulation feeding pipe, replace with nitrogen three times, vacuumize and raise the temperature to 110°C, then pressurize to 0.000MPa and pass through 80g of ring Propylene oxide, when the pressure drops significantly and the temperature rises rapidly, it indicates that the DMC catalyst has been induced, and when the pressure drops below 0.003MPa, it indicates that the induction is over. Keep the temperature of the reactor at 110° C., and then continuously feed 1520 g of propylene oxide. Then add the mixture of n-butanol and propylene oxide (n-butanol / propylene oxide=74: 1926) continuously in the reactor with the speed of 10000g / h, simultaneously DMC catalyst and butyl polyether (molecular weight 2000) carrier ( DMC concentration (15000ppm in terms of carrier) is continuously added through the external circulation pipeline at a speed of 20g / h. Keep th...

Embodiment 3

[0030] Add 600g of butyl polyether (molecular weight: 2000) and 0.09g of DMC catalyst to a 5L reaction kettle with an external circulation feeding pipe, replace with nitrogen three times, vacuumize and raise the temperature to 120°C, then pressurize to 0.000MPa and pass through a 120g ring Propylene oxide, when the pressure drops significantly and the temperature rises rapidly, it indicates that the DMC catalyst has been induced, and when the pressure drops below 0.003MPa, it indicates that the induction is over. Keep the temperature of the reactor at 120° C., and then continuously feed 2280 g of propylene oxide. Then add the mixture of n-butanol and propylene oxide (n-butanol / propylene oxide=74:9928.4) continuously in the reactor with the speed of 4000g / h, simultaneously DMC catalyst and butyl polyether (molecular weight 2000) carrier ( DMC concentration (3000ppm in terms of carrier) is continuously added through the external circulation pipeline at a speed of 40g / h. Keep th...

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Abstract

The invention discloses a continuous synthesis method of polyether. The continuous synthesis method comprises the following steps: adding low molecular weight polyether into a reaction kettle, adding a DMC (Dimethyl Carbonate) catalyst, ventilating an alkyleneoxide compound after nitrogen gas displacement, and carrying out induced reaction, wherein the DMC catalyst is indicated to be induced when pressure is obviously lowered and temperature is quickly increased; and then, with small molecule alcohol as an initiator, continuously adding the alkyleneoxide compound into the reaction kettle after mixing with the initiator, and continuously adding the DMC catalyst by an external circulating pipeline to continuously synthesize out the polyether product. According to the continuous synthesis method disclosed by the invention, the applied initiator is low in price, and the obtained polyether product is wide in molecular weight range, high in construction ratio and narrow in molecular weight distribution..

Description

technical field [0001] The invention relates to a method for continuously synthesizing polyether, in particular to a method suitable for preparing polyether with small molecule alcohol as a starting agent. Background technique [0002] The double metal cyanide complex (DMC) catalyst full continuous polyether synthesis process is a synthesis method that continuously adds alkylene oxide compounds, initiators and catalysts, and continuously derives polyether products. [0003] The small molecular alcohol initiators used in the conventional synthesis of polyether, such as methanol, allyl alcohol, propylene glycol, glycerin, etc., are likely to cause DMC poisoning in the general production process, so it is generally necessary to use low molecular weight alcohols with a molecular weight of several hundred Polyether is used as an initiator to initiate the polymerization of alkylene oxide, which makes the "construction ratio" of the prepared polyether lower, which affects productio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G65/28
Inventor 王文浩高宝柱贾利亚李新豪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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