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Absorption process for directly preparing dimethyl ether and methanol water solution from synthetic raw material gas

A methanol aqueous solution and dimethyl ether technology, which is applied in the preparation of ether from alkylene oxide, ether preparation, organic chemistry, etc., can solve the problems of high operating costs, achieve the effects of reducing rectification energy consumption, improving utilization rate, and reducing consumption

Inactive Publication Date: 2002-06-05
WUHUAN ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses absorption to remove methanol, and extracts dimethyl ether with ethanol or water, and the operating cost is relatively high.

Method used

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  • Absorption process for directly preparing dimethyl ether and methanol water solution from synthetic raw material gas
  • Absorption process for directly preparing dimethyl ether and methanol water solution from synthetic raw material gas

Examples

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Effect test

Embodiment 1

[0024] Adopt attached figure 1 Shown is the direct preparation of dimethyl ether methanol aqueous solution absorption process flow from synthetic raw material gas, the raw material gas (H 2 +CO>50%, the rest is CO 2 , N 2 , Ar, CH 4 , O 2 ) Compressed by compressor 1 to 3.0~7.0MPa and mixed with the circulating gas from the circulating gas compressor 2, it enters the heat exchanger 3, exchanges heat with the synthesis gas from the reactor, and then enters the synthesis reactor 4. (Copper-based dimethyl ether synthesis catalyst produced by Zhejiang University or copper-based synthesis dimethyl ether catalyst produced by Dalian Institute of Chemical Physics) In the isothermal reactor, at a pressure of 3.0~7.0MPa and a temperature of 180-320℃, hydrogen and Carbon monoxide reacts to produce dimethyl ether. The hot synthesis gas from the reactor first exchanges heat with the raw material gas and then enters the cooler 6 to cool to 40°C, and then passes through the condenser 8 to cool t...

Embodiment 2

[0028] The demonstration test device of a chemical fertilizer plant uses the same process and equipment as in Example 1, and the synthesis reaction conditions are the same as in Example 1. The outlet temperature of the dimethyl ether condenser is 10°C. A methanol aqueous solution with a concentration of 95% is used as the absorbent, and the volume ratio of methanol aqueous solution / syngas is 0.01.

[0029] In the pre-rectification tower, under the operating conditions of pressure 1.0~2.0MPa, bottom temperature 60-160℃, and top condenser temperature -30~10℃, the solubility in dimethyl ether solution can be well reduced The gas is separated from the dimethyl ether.

[0030]In the main distillation tower, the concentration of dimethyl ether at the top of the tower can reach above 99.5% under the operating conditions of a pressure of 0.3-1.0 MPa, a temperature of the bottom of the tower 60-200°C, and a temperature of the condenser at the top of the tower 0-45°C.

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Abstract

The present invention puts forward an absorption process for preparing dimethyl ether-methanol water solutino from synthetic feed gas. The process includes synthesis of dimethyl ether, separation and absorption of dimethyl ether from synthetic gas and fractionation of dimethyl ether-contained solution of prepare high purity dimethyl ether. The process features that synthetic gas is first cooled to -20 to 10 deg.C and condensed to separated partial dimethyl ether and then absorbed with water solution of methanol to absorb un-condensed dimethyl ether, and the water solution containing dimethyl ether and methanol is fractioned to produce dimethyl ether product with concentration over 99.5 wt%. Methanol may be reused to lower production cost.

Description

Technical field [0001] The invention relates to a process method for directly preparing dimethyl ether from a raw material gas whose main components are hydrogen and carbon monoxide. Background technique [0002] Dimethyl ether is a fine chemical product with high added value. It has many unique uses in medicine, dyes, pesticides and other industries. It can be used as a methyl alkylating agent, as well as a solvent, leaching agent, refrigerant, fuel and spray. [0003] The largest market for dimethyl ether currently is for aerosol products. Because dimethyl ether is an excellent aerosol spray carrier, it is widely used in the manufacture of pesticides, cosmetics, and daily chemicals. [0004] Studies have shown that adding a mixture containing dimethyl ether to gasoline or diesel can effectively increase the octane number of gasoline or the cetane number of diesel, so that gasoline and diesel have good combustion economic performance and can increase engine power by 10 -15%; bec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C41/01C07C41/02C07C43/04
Inventor 李仕禄严学安王留书郑振安王发坤
Owner WUHUAN ENG
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