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Method for concurrently producing dimethyl ether, liquefied natural gas and urea

A technology for liquefied natural gas and dimethyl ether, applied in chemical instruments and methods, preparation of organic compounds, preparation of ether, etc., can solve problems such as emission loss and waste of coal resources, and achieve the effects of saving investment, realizing economy, and simple process

Inactive Publication Date: 2008-11-26
SHENGHE RESOURCES HLDG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, a large amount of carbon does not participate in the reaction of methanol, but the greenhouse gas CO 2 Emissions are lost, and the ratio of carbon in coal to methanol is only 37%, resulting in a huge waste of coal resources

Method used

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  • Method for concurrently producing dimethyl ether, liquefied natural gas and urea

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Experimental program
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Effect test

Embodiment 1

[0033] In the process of coal gasification, the coal is pre-treated and sprayed into the ash fusion gasification furnace at a temperature of 1000 ° C and a pressure of 1.0 MPa to chemically react with water vapor and pure oxygen from air separation to generate CO, H 2 , CO 2、H 2 O and a small amount of CH 4 、H 2 Water gas with S, COS and other components. The water gas containing a small amount of dust and impurities is initially purified. Due to the dusty water gas from gasification, it still contains acid gas after being washed, dedusted and cooled by Venturi scrubber and carbon scrubber. In order to protect the compressor, desulfurization by tannin extract method is also used. Make H 2 S content is less than 30mg / Nm 3 , the pre-purified water gas is compressed to a pressure of 5.7MPa, and then deeply purified. Deep purification adopts polyethylene glycol dimethyl ether (NHD) method for desulfurization and decarburization. Removed H 2 S gas desulfurization recovery...

Embodiment 2

[0038] In the coal gasification process, the coal is pre-treated to make 65% coal-water slurry and sprayed into the Texaco gasifier at a temperature of 1450°C and a pressure of 6.5Mpa to form pure oxygen with gasified water vapor and air separation. Carry out a chemical reaction to produce CO, H 2 , CO 2 、H 2 O and a small amount of CH 4 、H 2 Water gas with S, COS and other components. The gasified dusty water gas, after being washed, dedusted and cooled by Venturi scrubber and carbon washing tower, enters deep purification, in which low-temperature methanol washing process is used for desulfurization and decarbonization. Removed H 2 S gas desulfurization recovery unit recovers sulfur and removes CO 2 To urea synthesis. The purified water gas is mixed with the hydrogen gas compressed to 5.7MPa pressure produced by pressure swing adsorption of coke oven gas to form methanol synthesis gas, H 2 S content≤0.1ppm, hydrogen-to-carbon ratio mole=(H 2 -CO 2 ) / (CO+CO 2 )=2.0...

Embodiment 3

[0043] In the coal gasification process, the coal is pre-treated to make 65% coal-water slurry and sprayed into the Texaco gasifier at a temperature of 1450 ° C and a pressure of 6.0 MPa to form pure oxygen with gasified water vapor and air separation. Carry out a chemical reaction to produce CO, H 2 , CO 2 、H 2 O and a small amount of CH 4 、H 2 Water gas with S, COS and other components. The gasified dusty water gas, after being washed, dedusted and cooled by Venturi scrubber and carbon washing tower, enters deep purification, in which low-temperature methanol washing process is used for desulfurization and decarbonization. Removed H 2 S gas desulfurization recovery unit recovers sulfur and removes CO 2 To urea synthesis. The purified water gas is mixed with hydrogen gas compressed to 5.2MPa pressure produced by pressure swing adsorption of coke oven gas to form methanol synthesis gas, H 2 S content≤0.1ppm, hydrogen-to-carbon ratio mole=(H 2 -CO 2 ) / (CO+CO 2 )=2.09...

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Abstract

The invention is a method of simultaneously producing dimethyl ether, liquefied natural gas and urea, primarily and deeply purifying the water gas obtained by raw coal gasification, and mixing the purified water gas with a part of H2 produced by variable pressure absorption of coke-oven gas, synthesizing methanol, synthesizing the dimethyl ether with methanol, where the coke-oven gas is purified and desulfurized and makes variable pressure absorption to extract H2, a part of H2 used as methanol synthesis supplement and the other part of H2 and N2 are mixed and synthesized into ammonia, the synthetic ammonia and the CO2 obtained from first condensation are mixed and synthesized into urea; the CO2 extracted from the first condensation of the coke-oven gas after variable pressure absorption and desorption is used for urea synthesis, and the remaining gas is processed by second condensation so that LNG and CO-N2 mixed gas are produced. And it has advantages of zero greenhouse gas exhaust, and high efficency unitilzation of effective composition in the raw materials, etc.

Description

technical field [0001] The invention belongs to a method for simultaneously producing dimethyl ether, liquefied natural gas and urea through coke oven gas and coal gas. technical background [0002] Urea is currently the most used nitrogen fertilizer. Dimethyl ether is not only an important chemical raw material, but also a clean fuel to replace gasoline, diesel and natural gas. Liquefied natural gas (LNG) is a relatively scarce clean fuel in my country (currently, domestic demand is strong and there is a large gap. ). Coke oven gas and coal can be used to produce dimethyl ether and urea by relying on the existing technology, but there are no related reports on the production of liquefied natural gas. At present, natural gas is mostly used as raw material for liquefied natural gas. [0003] Coke oven gas is a by-product in the process of coal carbonization into coke, the main components are: H 2 58-66%; CH 4 21-25%; CO 5-8%; CmHn 1.6-2.0%; CO 2 1.9-2.3%;N 2 2-6%. To...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C43/04C07C41/09C07C273/04C10L3/08
Inventor 谢克昌杜文广刘守军程加林何小刚
Owner SHENGHE RESOURCES HLDG CO LTD
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