Method for dehydrating polyether initiator

A starter and polyether technology, applied in the chemical field, can solve the problems of restricting the application and development of polyether, high water content of starter, affecting the quality of polyether, etc., achieve significant market application value, high dehydration efficiency, and improve dehydration efficiency effect

Active Publication Date: 2018-08-10
眉山海螺新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing starter dehydration process all adopts the traditional vacuum distillation process to remove water. The traditional vacuum distillation dehydration process has the disadvantages of poor removal effect and high water content in the starter after removal, which affects the polymerization process. The quality of ether also restricts the application and development of polyether

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 500Kg glycerin and 10KgNaOH into the reactor, control the temperature to 110°C, pressure to -0.090MPa, turn on the circulation pump, and control the circulation volume to 20m 3 / h, the initiator is atomized in the reactor through the spray system to form atomized particles, the average particle size of the droplets is 500um; dry nitrogen is blown from the bottom of the reactor (purity is 99.95%, pressure dew point -52°C) , the nitrogen flow rate is 3.0m 3 / h, use nitrogen to take away the moisture in the initiator to realize the dehydration of the initiator. Dehydrate for 30 minutes, and take a sample to detect that the water content in the initiator is 0.05%.

Embodiment 2

[0025] Add 500Kg propylene glycol and 10KgKOH to the reactor, control the temperature at 100°C, the pressure at -0.080MPa, turn on the circulation pump, and control the circulation volume at 25m 3 / h, the initiator is atomized in the reactor through the spray system to form atomized particles, the average particle size of the droplets is 400um; dry nitrogen is blown from the bottom of the reactor (purity is 99.97%, pressure dew point -55 ℃) , the nitrogen flow rate is 2.0m 3 / h, use nitrogen to take away the moisture in the initiator to realize the dehydration of the initiator. Dehydration was performed for 30 minutes, and the water content in the initiator was detected by sampling to be 0.03%.

Embodiment 3

[0027] Add 500Kg triethanolamine and 6KgNaOH into the reactor, control the temperature at 130°C, the pressure at -0.092MPa, turn on the circulation pump, and control the circulation volume at 22m 3 / h, the initiator is atomized in the reactor through the spray system to form atomized particles, the average particle size of the droplets is 600um; dry nitrogen is blown from the bottom of the reactor (purity is 99.93%, pressure dew point -53°C) , the nitrogen flow rate is 3.5m 3 / h, use nitrogen to take away the moisture in the initiator to realize the dehydration of the initiator. Dehydration was performed for 30 minutes, and the water content in the initiator was sampled and detected to be 0.06%.

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PUM

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Abstract

The invention relates to the field of chemistry, in particular to a method for dewatering a polyether initiator. The method for dewatering the polyether initiator, provided by the invention, comprises the following steps: spraying the polyether initiator into fog drops through arranging a spraying system at the top of a reactor, introducing nitrogen from the bottom of the reactor, enabling the polyether initiator fog drops and the nitrogen to form a uniform gas-liquid dispersion system taking the nitrogen as a continuous phase and taking away water generated by the reaction of the polyether initiator with a base catalyst from the top of the reactor through the dry nitrogen, so that the dewatering of the polyether initiator is realized. Compared with a traditional vacuum distillation method, the method for dewatering the polyether initiator, provided by the invention, has the advantages of being high in dewatering efficiency and lower in moisture content of the dewatered initiator.

Description

technical field [0001] The invention relates to the chemical field, in particular to a method for dehydrating a polyether initiator. Background technique [0002] Polyether is prepared by polyaddition reaction between an initiator containing active hydrogen and ethylene oxide, propylene oxide, butylene oxide, etc. in the presence of a catalyst. The polyether with the largest yield is the reaction of glycerol (glycerol) as the initiator, alkali as the catalyst and epoxide (generally propylene oxide and ethylene oxide together), by changing the propylene oxide and ethylene oxide Various general-purpose polyether polyols can be produced according to the specific feeding method (mixing or separate feeding), dosage ratio, feeding sequence and other conditions. Polyether polyol is an important derivative of propylene oxide and one of the main raw materials for the synthesis of polyurethane. It can be used as functional additives such as emulsifiers, wetting agents, defoamers, dem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C31/22C07C29/74C07C29/76C07C31/20C07C31/24C07C215/12C07C213/10C07B63/00
CPCC07B63/00C07C29/74C07C29/76C07C213/10C07C31/225C07C31/205C07C31/245C07C215/12
Inventor 曾君张大康吴建越龙卫红李健吴小波
Owner 眉山海螺新材料科技有限公司
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