Device and processing method for synthesis of ethylene glycol monobutyl ether through reactive distillation

A technology of ethylene glycol monobutyl ether and reactive distillation, which is applied in the fields of ether preparation, chemical industry, and alkylene oxide preparation ether, etc., which can solve the problems of easy side reactions, difficulty in improving production efficiency, and difficulty in large-scale continuous production and other problems to achieve the effect of solving unstable product quality

Active Publication Date: 2015-07-22
TIANJIN PULAI CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The patents of Hu Xiannian et al. and Guo Dengfeng et al. are for the synthesis of ethylene glycol monobutyl ether by a batch reaction process, which is difficult to improve production efficiency and large-scale continuous production; although the patents of Qin Xudong et al. can be produced continuously, the reaction temperature is high and the operation is difficult. The pressure is high, the requirements for equipment and pipelines are high, and the investment in equipment is large
In addition, the synthesis of ethylene glycol monobutyl ether by the above various processes, the reaction residence time is too long, and side reactions are prone to occur, and ethylene glycol monobutyl ether is easy to continue to react into diethylene glycol monobutyl ether and triethylene glycol monobutyl ether

Method used

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  • Device and processing method for synthesis of ethylene glycol monobutyl ether through reactive distillation

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Experimental program
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Effect test

Embodiment 1

[0039] The reaction section of the reactive distillation column is 20 trays (reactive distillation trays); the first stripping section is 15 trays, the upper feed port of the reaction section corresponds to the third tray, and the lower feed port of the reaction section corresponds to The 18th tray; the rectification section of the ethylene glycol monobutyl ether refining tower has 12 trays, and the second stripping section has 5 trays.

[0040] N-butanol and ethylene oxide enter the reactor through preheating, and after preheating, the temperature of n-butanol and ethylene oxide reaches 45°C when entering the reactor. The feed molar ratio of ethylene oxide and n-butanol was 1:2. The reaction temperature in the reactor is 120° C., and the reaction pressure is 0.5 MPa (gauge pressure). In the reactive distillation tower, the reaction temperature is 100°C, the operating pressure is 0.1 MPa (gauge pressure), and the top of the tower is total reflux. When the reactor of the reac...

Embodiment 2

[0043] The reaction section of the reactive distillation tower is a 22-layer tray (reactive distillation tray); the first stripping section is a 12-layer tray, the upper feed port of the reaction section corresponds to the 4th tray, and the lower feed port of the reaction section corresponds to The 18th tray; the rectification section of the ethylene glycol monobutyl ether refining tower has 10 trays, and the second stripping section has 6 trays.

[0044] N-butanol and ethylene oxide enter the reactor through preheating, and after preheating, the temperature of n-butanol and ethylene oxide reaches 45°C when entering the reactor. The feed molar ratio of ethylene oxide and n-butanol was 3:1. The reaction temperature in the reactor is 100° C., and the reaction pressure is 0.1 MPa (gauge pressure). In the reactive distillation tower, the reaction temperature is 120° C., the operating pressure is 0.01 MPa (gauge pressure), and the top of the tower is total reflux. When the reacto...

Embodiment 3

[0047] The reaction section of the reactive distillation column is 25 trays (reactive distillation trays); the first stripping section is 14 trays, the upper feed port of the reaction section corresponds to the 4th tray, and the lower feed port of the reaction section corresponds to The 18th tray; the rectification section of the ethylene glycol monobutyl ether refining tower has 10 trays, and the second stripping section has 7 trays.

[0048] The n-butanol and ethylene oxide enter the reactor through preheating, and after preheating, the temperature of n-butanol and ethylene oxide reaches 100°C when entering the reactor. The feed molar ratio of ethylene oxide and n-butanol was 8:1. The reaction temperature in the reactor is 30° C., and the reaction pressure is 0.01 MPa (gauge pressure). In the reactive distillation tower, the reaction temperature is 40° C., the operating pressure is 0.5 MPa (gauge pressure), and the top of the tower is total reflux. When the reactor of the ...

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Abstract

The invention provides a device and technological process for synthesis of ethylene glycol monobutyl ether through reactive distillation. The device comprises a reactor, a reactive distillation tower, a treating tower, a condenser, a reboiler, a heat exchanger, a return tank, a kettle outlet tank, a pump and a pipeline. In the technological process, the reactive distillation tower is combined with the reactor and the treating tower. Acidic cation exchange resin or alkali anion exchanger is selected for being used as a catalyst. Preheated ethylene oxide and butanol enter into a reactor for reaction, and unreacted materials pumped into the reactive distillation tower react or are rectified on a tower plate or a filling material on the section; materials flowing down after passing through the reaction section are rectified through a stripping section; total reflux is conducted at the tower top of the reactive distillation tower; materials discharged from the tower kettle of the reactive distillation tower are pressurized to enter into the treating tower for rectification; the ethylene glycol monobutyl ether with the purity higher than 99.9 percent is obtained from the tower top of the treating tower, the yield is greater than 97 percent, and the diethylene glycol monobutyl ether is obtained from the tower kettle of the rectification tower. The device solves the problems that ethylene glycol monobutyl ether produced intermittently is not stable in product quality, the yield is relatively low, the loss of the catalyst is high, and sewage treatment is difficult.

Description

technical field [0001] The invention belongs to a device and a process method for preparing ethylene glycol monobutyl ether, in particular to a device and a process method for preparing ethylene glycol monobutyl ether by reactive distillation of ethylene oxide and n-butanol. Background technique [0002] Ethylene glycol monobutyl ether contains hydroxyl groups and ether linkages, so it is a solvent that is both hydrophilic and lipophilic. It is widely used in coatings, inks, cleaning agents, antifreeze, brake fluid, etc. [0003] The reaction of ethylene oxide and n-butanol to produce ethylene glycol monobutyl ether usually uses liquid acid or liquid base as a catalyst. Liquid acid is used as a catalyst. Although it has high catalytic activity, it has serious corrosion on equipment, and the waste liquid is polluted and difficult to handle. Liquid alkali is used as a catalyst, which has many side reactions and poor selectivity. Hu Xiannian et al. (Chinese Patent Applicatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C41/03C07C43/13
CPCC07C41/03C07C41/42C07C43/13Y02P20/10
Inventor 孙立军李柏春巢飞
Owner TIANJIN PULAI CHEM TECH
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