Method for preparing dimethyl ether by liquid phase compression

A technology of dimethyl ether and liquid phase, which is applied in the field of pressurized production of dimethyl ether in liquid phase, which can solve the problems of high energy consumption, high reaction temperature, and high catalyst cost, so as to save power consumption, improve processing capacity, and reduce energy consumption Effect

Inactive Publication Date: 2007-03-07
水煤浆气化及煤化工国家工程研究中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of method has the disadvantages of high catalyst cost, complicated preparation method, high reaction temperature, high energy consumption, and low single-pass conversion and selectivity in the reaction process.

Method used

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  • Method for preparing dimethyl ether by liquid phase compression
  • Method for preparing dimethyl ether by liquid phase compression
  • Method for preparing dimethyl ether by liquid phase compression

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] First put the concentrated sulfuric acid into the bubble column reactor, then heat the concentrated sulfuric acid to 120°C with 0.6Mpa steam, and then feed methanol with a content of 92% (wt) at a rate of 20t / h through the methanol feed pump. Continuously add to the bubble column reactor until the reaction temperature is controlled at 120°C and the reactor pressure rises to 0.3Mpa, open the top control valve of the bubble column reactor, and the gas phase passes through the heat exchanger, gas-liquid separator, and drying After the condenser and the condenser, a liquid dimethyl ether product with a content greater than 98.5% is obtained.

Embodiment 2

[0036] First put the concentrated sulfuric acid into the bubble column reactor, then heat the concentrated sulfuric acid to 130°C with 1.2Mpa steam, and then feed the methanol with a content of 99% (wt) at a speed of 15t / h through the methanol feed pump. Continuously add to the bubble column reactor until the reaction temperature reaches 380°C and the reactor pressure rises to 3.5Mpa, open the top control valve of the bubble column reactor, and the gas phase passes through the heat exchanger, gas-liquid separator, and dryer And after the condenser, a liquid dimethyl ether product with a content greater than 98.5% is obtained.

Embodiment 3

[0038] First put the concentrated sulfuric acid into the bubble column reactor, then heat the concentrated sulfuric acid to 120°C with 1.0Mpa steam, and then feed the methanol with a content of 95% (wt) at a speed of 18t / h through the methanol feed pump. Continuously add to the bubble column reactor until the reaction temperature reaches 220°C and the reactor pressure rises to 0.8Mpa, open the top control valve of the bubble column reactor, and the gas phase passes through the heat exchanger, gas-liquid separator, and dryer And after the condenser, a liquid dimethyl ether product with a content greater than 98.5% is obtained.

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Abstract

The invention discloses a manufacturing method of dimethyl ether through liquid-phase pressurizing method, which comprises the following steps: adopting carbinol as raw material; loading in the bubbling tower reactor with 20% concentrated sulfuric acid and phosphoric acid based on methanesulfonic acid or fluorosulfuric acid as catalyst; controlling the temperature at 120-380 deg.c and pressure at 0.3-3.5Mpa; dehydrating; separating the gas; drying; condensing to obtain the product.

Description

Technical field: [0001] The invention relates to the field of chemical technology, in particular to a method for producing dimethyl ether under pressure in liquid phase Background technique: [0002] Dimethyl ether (CH 3 OCH 3 ) is a colorless gas or compressed liquid with a slight ether odor, non-toxic and non-corrosive. [0003] As a substitute for liquefied petroleum gas, dimethyl ether is used alone as a civil fuel. It has the advantages of high oxygen content, short carbon chain, sufficient combustion, no black smoke, no residual liquid, and combustion tail gas in line with national standards. . [0004] Dimethyl ether (DME) can be added to liquefied petroleum gas with a volume content of 25%-50%, which can not only increase the C 5 The gasification efficiency, but also increase the C 3 、C 4 with C 5 mutual solubility between them, thereby eliminating the residual liquid in the liquefied petroleum gas cylinder; dimethyl ether is easy to compress, and the storage ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C43/04C07C41/09
Inventor 郭宝贵褚宏春吕运江吴章韩飞孙岩
Owner 水煤浆气化及煤化工国家工程研究中心
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