Process for production of dimethyl ether and combined production of natural gas and urea from coal-based synthetic gas and coke oven gas

A technology for coal-based synthesis gas and coke oven gas, which is applied in the dehydration of hydroxyl-containing compounds to prepare ethers, the preparation of organic compounds, and the preparation of ethers, etc., can solve problems such as hydrogen supplementation, achieve strong absorption capacity, improve utilization rate, and increase circulation capacity. small effect

Active Publication Date: 2015-10-14
SEDIN ENG
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AI Technical Summary

Problems solved by technology

[0009] The production method of the present invention can make full use of the characteristics that coke oven gas has more hydrogen and less carbon, while the syngas has more carbon and less hydrogen, and complements the advantages of the two, and mixes them in a certain proportion to meet the hydrogen-carbon ratio of synthesizing dimethyl ether, so as to solve the problem of separate The use of coke oven gas to produce dimethyl ether requires carbon supplementation or the use of coal-based synthesis gas alone to produce dimethyl ether requires hydrogen supplementation. At the same time, it 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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  • Process for production of dimethyl ether and combined production of natural gas and urea from coal-based synthetic gas and coke oven gas

Examples

Experimental program
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Effect test

Embodiment 1

[0034] The coke oven gas produced by the tamping coke oven (volume percentage is composed of H 2 : 53%, CH 4 : 26%, CO+CO 2 :15%, N 2 : 6%) and coal-based syngas produced by Lurgi furnace (volume percentage composition is CO: 52%, H 2 : 23%, CO 2 : 14%, CH 4 : 11%, H 2 S: 0.2%) is passed into the gas cabinet at a volume ratio of 0.7:1 and fully mixed to form a hydrogen-carbon molar ratio H 2 / C=0.99 meets the crude raw material gas of dimethyl ether synthesis;

[0035] Crude raw material gas is compressed and washed with methanol at low temperature to remove H at -42°C and 4.0MPa 2 S and other impurities, get H 2 The raw material gas with S content less than 0.1ppm, the hydrogen sulfide desulfurization and recovery after removal, the purified crude raw material gas adopts the cryogenic separation technology of American Chemtex and Berkeley Weiqi Company, and enters the cryogenic separation, at a temperature of -156°C , the pressure is 4.0MPa to separate methane to mak...

Embodiment 2

[0037] The coke oven gas produced by the tamping coke oven (volume percentage is composed of H 2 : 61%, CH 4 : 23%, CO+CO 2 :11%,N 2 : 5%) and coal-based synthesis gas produced by pressurized gasification of crushed coal (volume percentage composition is CO: 59%, H 2 : 20%, CO 2 : 12%, CH 4 : 9%, H 2 S: 0.23%) is passed into the gas cabinet at a volume ratio of 1:1 and fully mixed to form a hydrogen-carbon molar ratio H 2 / C=1.24 meets the crude raw material gas of dimethyl ether synthesis;

[0038] Crude raw gas is compressed and washed with methanol at low temperature to remove H at -46°C and 4.5MPa 2 S and other impurities, get H 2 The raw material gas with S content less than 0.1ppm, the hydrogen sulfide desulfurization and recovery after removal, the purified raw material gas adopts the cryogenic separation technology of American Chemtex and Berkeley Weiqi Company, and enters the methane cryogenic separation, at a temperature of -152 ℃, pressure 4.5MPa to separat...

Embodiment 3

[0040] The coke oven gas produced by the top-loading coke oven (volume percentage composition is H 2 : 52%, CH 4 : 27%, CO+CO 2 :16%,N 2 : 5%) and the coal-based synthesis gas produced by Texaco coal-water slurry gasifier gasification (volume percentage composition is CO: 58%, H 2 : 20%, CO 2 : 9%, CH 4 : 13%, H 2 S: 0.21%) is passed into the gas cabinet at a volume ratio of 1.8:1 and fully mixed to form a hydrogen-carbon molar ratio H 2 / C=1.39 meets the crude raw material gas of dimethyl ether synthesis;

[0041] The crude raw material gas is compressed and then enters into the NHD method for purification. Under the conditions of pressure 2.5MPa and temperature 2°C, impurities such as H2S are removed to obtain H 2 For raw material gas with S content less than 0.1ppm, the hydrogen sulfide removed is desulfurized and recovered, and the purified crude raw gas enters supercritical methane separation, and the methane is separated in a supercritical state with a pressure of...

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Abstract

The invention provides a process for production of dimethyl ether and combined production of natural gas and urea from coal-based synthetic gas and coke oven gas. The process comprises the following steps: introducing coke oven gas and coal-based synthetic gas into a gasometer and carrying out uniform mixing to form crude raw material gas; carrying out compression and then purification and recovering removed hydrogen sulfide after removal of sulfur; and subjecting purified crude raw material gas to cryogenic separation so as to obtain clean raw material gas, preparing liquefied natural gas or compressed natural gas products from separated methane, synthesizing dimethyl ether from the clean raw material gas and subjecting purge gas produced after synthesis of the dimethyl ether to pressure-variable adsorption and separation, wherein separated CO and H2 are returned and purified, and separated CO2 and liquefied ammonia enter a urea synthesis apparatus for synthesis of urea. The process has the advantages of diversification of products and capacity of adjusting excess production power, facilitating energy conservation and emission reduction, regulating energy structure, increasing the utilization rate of raw material gas and reducing production cost for dimethyl ether.

Description

technical field [0001] The invention belongs to a process for producing dimethyl ether from coal-based synthesis gas and coke oven gas and co-producing natural gas and urea. 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. Sin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C43/04C07C41/09C10L3/08C07C273/04
CPCC07C41/09C07C273/04C10L3/08C07C43/043
Inventor 曹会博李晓杨在建马英民王贵
Owner SEDIN ENG
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