Method for producing dimethyl ether

A technology of dimethyl ether and methane, which is applied in the field of dimethyl ether production, can solve problems such as hydrogen supplementation, and achieve the effects of improving utilization rate, promoting energy saving and emission reduction, and facilitating operation and management

Active Publication Date: 2015-09-30
SEDIN ENG
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0009] The production method of the present invention can make full use of the characteristics of coke oven gas with more hydrogen and less carbon, and coal-based synthesis gas with more carbon and less hydrogen, and complement each other's advantages, and mix them in a certain proportion to meet the hydrogen-carbon ratio for synthesizing dimethyl ether. Solve the shortcomings of using coke oven gas alone to produce dimethyl ether that need to supplement carbon or using coal-based syngas to produce dimethyl ether that requires hydrogen supplementation, and at the same time can by-produce LNG (liquefied natural gas) or CNG (compressed natural gas)
It can also react carbon dioxide gas produced in the production process of synthetic dimethyl ether with liquid ammonia to produce synthetic urea, so as to improve the utilization rate of raw material gas and overcome the shortcomings of the existing one-step production process of dimethyl ether

Method used

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  • Method for producing dimethyl ether

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Experimental program
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Effect test

Embodiment 1

[0036] The coke oven gas produced by the tamping coke oven (volume percentage is composed of H 2 : 58%, CH 4 : 21%, CO+CO 2 :15%, N 2 : 6%) and coal-based syngas produced by Lurgi furnace (volume percentage composition is CO: 51%, H 2 : 24%, CO 2 : 14%, CH 4 : 11%, H 2 S: 0.2%) is passed into the gas cabinet at a volume ratio of 0.4:1 and fully mixed to form a mixed gas, accounting for 95% of the mixed gas volume. The gas is in Ni / γ-Al 2 o 3 Catalyst, the space velocity is 20000h -1 , reforming at a temperature of 580°C and a pressure of 2.0MPa. The reformed gas is compressed together with the remaining gas mixture to form a hydrogen-carbon molar ratio H 2 / C=0.91 meets the crude raw material gas of dimethyl ether synthesis;

[0037] Crude raw gas is compressed and washed with methanol at low temperature to remove H at -45°C and 4.5MPa 2 S and other impurities, get H 2 The S content is less than 0.1ppm in the feed gas, the hydrogen sulfide removed is desulfurized a...

Embodiment 2

[0039] The coke oven gas produced by the top-loading coke oven (volume percentage composition is H 2 : 60%, CH 4 : 23%, CO+CO 2 :11%,N 2 : 6%) and coal-based synthesis gas produced by space furnaces (volume percentage composition is CO: 54%, H 2 : 26%, CO 2 : 10%, CH 4 : 14%, H 2 S: 0.21%) is passed into the gas cabinet at a volume ratio of 0.9:1 and fully mixed to form a mixed gas, accounting for 40% of the mixed gas. The gas is in Ni / γ-Al 2 o 3 Catalyst, space velocity is 26000h -1 , reforming at a temperature of 600°C and a pressure of 3.0 MPa. The reformed gas is compressed together with the remaining gas mixture to form a hydrogen-carbon molar ratio H 2 / C=1.30 meets the crude raw material gas of dimethyl ether synthesis;

[0040] The crude raw material gas is purified by thermal alkali method after being compressed, and H is removed under the conditions of pressure 1.5MPa and temperature 98°C 2 S and other impurities, get H 2 The S content is less than 0.1ppm...

Embodiment 3

[0042] The coke oven gas produced by the tamping coke oven (volume percentage is composed of H 2 : 55%, CH 4 : 26%, CO+CO 2 :14%,N 2 : 5%) and coal-based synthesis gas produced by pressurized gasification of crushed coal (volume percentage composition is CO: 53%, H 2 : 24%, CO 2 : 12%, CH 4 : 10%, H 2 S: 0.28%) into the gas cabinet at a volume ratio of 1.5:1 and fully mixed to form a mixed gas, accounting for 80% of the mixed gas in Ru / γ-Al 2 o 3 Catalyst, space velocity is 31000h -1 , reforming at a temperature of 630°C and a pressure of 3.6MPa. The reformed gas is compressed together with the remaining gas mixture to form a hydrogen-carbon molar ratio H 2 / C=1.49 meets the crude raw material gas of dimethyl ether synthesis;

[0043] The crude raw material gas is purified by NHD method after being compressed, and H is removed at a pressure of 2.5MPa and a temperature of 3°C. 2 S and other impurities, get H 2 S content is less than 0.1ppm raw material gas, the hydr...

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Abstract

A method for producing dimethyl ether comprises the steps that coke oven gas and coal-based synthesis gas are fed into a gas holder to form a gas mixture, reforming is conducted on one part of the gas mixture through methane, the reformed gas mixture is mixed with the rest of the gas mixture to form crude feed gas, purification is conducted on the compressed crude feed gas, desulphurizing and recycling are conducted on removed hydrogen sulfide, methane separation is conducted on the purified crude feed gas to obtain net feed gas, separated methane is made into liquefied natural gas products, dimethyl ether synthesis is conducted on the net feed gas to obtain the dimethyl ether, separation is conducted on purge gas produced after the dimethyl ether synthesis is conducted through pressure swing adsorption, separated CO and H2 return to the purification process, and urea synthesis is conducted on separated CO2 and liquid ammonia to obtain urea. The method for producing the dimethyl ether has the advantages that products are diversified, the utilization rate of the feed gas is increased, and the production cost of the dimethyl ether is reduced.

Description

technical field [0001] The invention belongs to a method for producing dimethyl ether. technical background [0002] Dimethyl ether is an important chemical product with excellent combustion performance and can be used as a substitute fuel for diesel to achieve clean combustion. DME is known as "the clean fuel of the 21st century". The traditional DME production technology is to first synthesize methanol from syngas, and then convert methanol to DME by dehydration, which is the so-called two-step DME process. With the advancement of technology, a new technology for the direct production of dimethyl ether from synthesis gas, that is, a one-step dimethyl ether production process, has been developed. The two reactions of methanol synthesis and methanol dehydration are carried out in the same reactor without intermediate processes. , directly synthesize dimethyl ether from synthesis gas. Since there are two reactions of methanol synthesis and methanol dehydration in the reacti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C43/04C07C41/01C07C273/04C10L3/08
CPCC07C41/01C07C273/04C10L3/08C07C43/043Y02P20/141
Inventor 曹会博李晓杨在建崔晓曦
Owner SEDIN ENG
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