Glycerinum alkyl ether production method and device based on heterogeneous catalysis

A technology of glycerol alkyl ether and production method, which is applied in the direction of dehydration of hydroxyl-containing compounds to prepare ether, ether preparation, organic chemistry, etc. It can solve the problems of reduced conversion rate of raw materials, large labor input, and limited production efficiency, so as to improve reaction conversion efficiency and prolong service life

Active Publication Date: 2016-07-06
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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  • Glycerinum alkyl ether production method and device based on heterogeneous catalysis
  • Glycerinum alkyl ether production method and device based on heterogeneous catalysis
  • Glycerinum alkyl ether production method and device based on heterogeneous catalysis

Examples

Experimental program
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Effect test

Embodiment 1

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

[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 It is filled with a solid alcohol dehydration catalyst, and is equipped with a liquid level sensor 9, which is electrically connected to the glycerin feed pump 3 through a liquid level controller 10; Below the froth, the gas phase feed port is set at the bottom of the reactor and communicated with the gas distributor, and the reaction material outlet is set at the top of the reactor.

[0056] The liquid glycerin storage tank 1 is co...

Embodiment 2

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

Embodiment 3

[0062] The production device is the same as in Example 1. The reactor is filled with catalyst MCM-41 with a particle size of 200 mesh. Turn on the liquid feed pump in turn, pump n-propanol and glycerin 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°C through a heat exchanger to be vaporized before entering the reactor, and the glycerin is directly sent into the reactor. The reaction temperature in the reactor is set at 245°C and the pressure at 0.3Mpa; the feed temperature of the flash tower is 230°C and the flash pressure is 0.3Mpa; the feed temperature of the rectification tower is 130°C and the reflux ratio is 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 heterogeneous catalysis of glycerin and low-carbon alcohol. Background technique [0002] In order to reduce the excessive dependence on fossil energy, human beings have begun to attach great importance to the development of biodiesel industry. However, for every ton of biodiesel produced, about 100 kilograms of glycerol will be produced as a by-product, which directly leads to an oversupply in the glycerin market and a continuous decline in prices. Converting glycerin 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 become a curr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C41/09C07C43/10C07C43/13
CPCC07C41/09C07C43/10C07C43/135
Inventor 贾广信李霞邢丽霞李飞飞
Owner ZHONGBEI UNIV
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