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Method for preparing dimethyl ether by dehydration of methanol

A methanol dehydration and dimethyl ether technology, applied in the dehydration of hydroxyl-containing compounds to prepare ether, ether preparation, organic chemistry, etc., to achieve the effects of reducing the amount of use, increasing the temperature of the outlet material, and saving energy and resources

Active Publication Date: 2011-10-26
CHNA ENERGY INVESTMENT CORP LTD +3
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However, their shortcomings are that there is room for further improvement in terms of energy saving and environmental protection.

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  • Method for preparing dimethyl ether by dehydration of methanol
  • Method for preparing dimethyl ether by dehydration of methanol

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Embodiment Construction

[0033] A specific embodiment of a method for producing dimethyl ether by methanol dehydration is given below in conjunction with the accompanying drawings, but it should be pointed out that the implementation of the present invention is not limited to the following embodiments.

[0034] A method for producing dimethyl ether by dehydration of methanol, its technological process is:

[0035] (1) Send the raw material methanol from the outside (methanol tank farm) into the methanol buffer tank (101) and mix it with the methanol from the top of the methanol rectification tower (302) to form methanol raw material;

[0036] (2) Methanol raw material is preheated by No. 1 methanol preheater (209), No. 2 methanol preheater (210) and No. 3 methanol preheater (201), and then enters the methanol vaporization tank (102) for vaporization;

[0037] (3) The vaporized methanol vapor passes through the feed and discharge heat exchanger for superheating reaction to a temperature of 250-260°C, a...

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Abstract

The invention discloses a method for preparing dimethyl ether by dehydration of methanol, belonging to the field of chemicals. The process flow for the method comprises the following steps that: (1) extraneous methanol is sent to a methanol buffer tank to mix with the methanol from the top of a methanol rectifying tower into the raw material methanol; (2) the raw material methanol enters into a methanol vaporization tank for vaporization after preheated in methanol preheaters; (3) vaporized methanol steam enters into a reactor after a thermal reaction, reaction gas after the reaction undergoes heat exchange in a charging discharging heat exchanger, a methanol heat exchanger, a methanol tower gas reboiler, and a dimethyl ether tower charging cooler sequentially and enters into a dimethyl ether tower charging stock tank for condensation into a gas phase and a liquid phase, and the gas phase and the liquid phase respectively enter into a dimethyl ether rectifying tower; (4) steam in the dimethyl ether rectifying tower enters into a dimethyl ether tower condenser from the top of the tower for condensation and flows back to the rectifying tower, dimethyl ether products are produced in side strippers through a dimethyl ether product storage tank, and waste water in the bottom of the rectifying tower is discharged after having changed heat with the raw material methanol in one methanol preheater. The beneficial effects of the invention are as follows: the process flow and the construction of the reactor used in the invention are simple and recovery of the heat of the reaction gasis more effective, enabling upsizing of equipment.

Description

technical field [0001] The invention relates to the technical field of chemical reaction equipment, in particular to a method for preparing dimethyl ether by dehydrating methanol. Background technique [0002] At present, there are two methods for producing dimethyl ether from methanol dehydration: liquid-phase method and gas-phase method. Distillation process. The production of dimethyl ether from methanol gas phase dehydration is the most mature and widely used production method of dimethyl ether in industry. [0003] Chinese patent document (patent application number 201010287747.1) discloses "a method for producing dimethyl ether from methanol", which is characterized in that: methanol first enters the vaporization and separation tower, removes high boiling point substances and impurities, reacts in a reactor, and dehydrates The product enters the packed rectification column for rectification to obtain dimethyl ether products with different purity. [0004] Chinese pa...

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Application Information

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IPC IPC(8): C07C43/04C07C41/09
Inventor 应卫勇张海涛马宏方房鼎业罗春桃潘强颜蜀雋林彬彬曹立英曹发海李涛张梁白孜杨任立军宋彩霞马军
Owner CHNA ENERGY INVESTMENT CORP LTD
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