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Glycerol alkyl ether production method and production device based on heterogeneous catalysis

A technology of glycerin alkyl ether and production method, which is applied in the fields of dehydration of hydroxyl-containing compounds to prepare ether, ether preparation, organic chemistry, etc., and can solve problems such as large labor input, reduced conversion rate of raw materials, unfavorable environmental protection, and efficient utilization of resource recycling , to achieve the effect of prolonging the service life and improving the reaction conversion rate

Active Publication Date: 2017-12-01
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this type of process are: firstly, it belongs to batch-type batch reaction, with large labor input and many influencing factors, so it is not suitable for large-scale continuous industrial production; secondly, due to the large amount of water generated in the reaction process cannot be removed from the reaction system in time, The chemical balance shifts to the left, the conversion rate of raw materials decreases, which is not conducive to the formation of products, and the existence of excess water will also lead to rapid catalyst deactivation, which limits production efficiency; third, the separation efficiency is low, and the three wastes are generated more, which is not conducive to environmental protection and environmental protection. Resource recycling and efficient utilization
According to existing reports, whether it is the "gas phase reaction" of continuous fixed-bed gas phase catalysis, or the "batch reaction" of intermittent high-pressure stirred tank closed catalysis, more than 60% of the products are glycerol monoalkyl ethers, glycerol dialkyl ethers, and glycerol dialkyl ethers. The content of ether and trialkyl glycerol ether does not exceed 20%, which is very limited for the improvement of oil quality and performance

Method used

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  • Glycerol alkyl ether production method and production device based on heterogeneous catalysis
  • Glycerol alkyl ether production method and production device based on heterogeneous catalysis
  • Glycerol alkyl ether production method and production device based on heterogeneous catalysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] The structure of glycerol alkyl ether production plant is as follows figure 1 , mainly composed of glycerin storage tank 1, low-carbon alcohol storage tank 2, bubble column reactor 6, flash distillation column 11 and rectification column 13 and so on.

[0055] The upper part of the bubble column reactor 6 is provided with a packing reflux demister 8, the middle and lower part is a reaction zone, and a gas distributor 7 is set at the bottom of the tower; the packing reflux demister 8 is filled with regular or bulk packing, and the reaction zone is The solid alcohol dehydration catalyst is filled with a liquid level sensor 9, which is electrically connected to the glycerol feed pump 3 through a liquid level controller 10; Below the foamer, a gas-phase feed port is arranged at the bottom of the reactor, communicated with the gas distributor, and a reaction material outlet is arranged at the top of the reactor.

[0056] The liquid glycerin storage tank 1 is connected to th...

Embodiment 2

[0060] The production device is the same as that of Example 1. The reactor was filled with catalyst MCM-22 with a particle size of 200 meshes. The ethanol and glycerol were pumped into the reactor according to the liquid volume flow ratio of 5:1, and the mass space velocity of ethanol was controlled to be 3h. -1 . Among them, ethanol is preheated to 79 ℃ through a heat exchanger and then gasified before entering the reactor, and glycerol is directly fed into the reactor. The reaction temperature in the reactor was set to 225°C and the pressure was 0.3Mpa; the feed temperature of the flash tower was 220°C and the flash pressure was 0.3Mpa; the feed temperature of the rectification tower was 115°C and the reflux ratio was 3. The experimental results are shown in Table 1.

Embodiment 3

[0062] The production device is the same as that of Example 1. The reactor was filled with catalyst MCM-41 with a particle size of 200 meshes. Turn on the liquid feed pump in turn, pump n-propanol and glycerol into the reactor according to the liquid volume flow ratio of 5:1, and control the mass space velocity of n-propanol to be 3h -1 . The n-propanol is preheated to 98 ℃ through a heat exchanger and then gasified before entering the reactor, and the glycerol is directly fed into the reactor. The reaction temperature in the reactor was set to 245°C and the pressure was 0.3Mpa; the feed temperature of the flash tower was 230°C and the flash pressure was 0.3Mpa; the feed temperature of the rectification tower was 130°C and the reflux ratio was 5. The experimental results are shown in Table 1.

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Abstract

The invention discloses a glycerinum alkyl ether production method based on heterogeneous catalysis.Liquid glycerinum enters a tower through the upper middle portion of a bubble tower reactor to make reverse contact with lower alcohol which enters through the bottom of the tower after being gasified and is dispersed through a gas distributor, glycerinum alkyl ether is generated through heterogeneous reaction under the action of a catalyst and passes through a return despumation area upwards to be removed out of the reactor, and the finished glycerinum alkyl ether product is obtained through flash separation.The production method has the advantages that conversion rate is high, energy consumption is low, the service life of the catalyst is long, and the molar concentration of glycerinum dialkyl ether and glycerinum trialkyl ether in reaction products is 66% or more.

Description

technical field [0001] The invention relates to a production method of glycerol alkyl ether, in particular to a continuous production method for preparing glycerol alkyl ether by utilizing glycerol and low-carbon alcohol heterogeneous catalysis. Background technique [0002] In order to reduce the excessive dependence on fossil energy, mankind has begun to attach great importance to the development of the biodiesel industry. However, for every ton of biodiesel produced, about 100 kilograms of glycerol will be by-produced, which directly leads to the oversupply of glycerin in the market, and the price continues to fall. Converting glycerol into other high value-added products has become an important research and development direction. In recent years, low-carbon alcohol products, including methanol and ethanol, have also shown a trend of overcapacity and falling prices. Therefore, the development of downstream industrial chains around low-carbon alcohols has also become a hot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C41/09C07C43/10C07C43/13
CPCC07C41/09C07C43/10C07C43/135
Inventor 贾广信李霞马文林贺贝贝孙一凡邢丽霞谢龙李飞飞
Owner ZHONGBEI UNIV
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