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Method for preparing liquefied natural gas by utilizing relief gas of methanol

A technology of methanol degassing and liquefied natural gas, which is applied in the direction of gas fuel, petroleum industry, fuel, etc., can solve the problems of inability to use gas, poor economic benefits, and inability to be fully utilized, so as to save energy, protect the environment, and increase products. The effect of diversity

Active Publication Date: 2012-10-17
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among these two methods, the economic benefit of the former is poor, and the latter cannot fully utilize most of the gas in the purge gas at the same time, and CH 4 and CO 2 underutilized

Method used

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  • Method for preparing liquefied natural gas by utilizing relief gas of methanol

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Experimental program
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Embodiment 1

[0038] Such as figure 1 As shown, the method for preparing synthetic natural gas alkane by utilizing coal-to-methanol purge gas in this embodiment includes the following main steps:

[0039](1) The composition of the coal-to-methanol purge gas is shown in Table 1. The coal-to-methanol purge gas was decompressed to 3.0 MPa, and the heat was exchanged to about 250°C.

[0040] (2), one-stage methanation reaction: the coal-to-methanol purge gas and the recycle gas generated later are mixed and heated and then enter the first-stage methanation furnace, and the molar ratio of the recycle gas to the purge gas entering the first-stage methanation furnace is 1 : 1, under the action of nickel-based catalyst, carry out one-stage methanation reaction; After one-stage reaction, the temperature of reactor outlet is 610 ℃, and wherein nickel-based catalyst is 20% NiO; 70% Al 2 o 3 And 20% MgO, all are mass ratio;

[0041] (3) Second-stage methanation reaction: the synthesis gas after the ...

Embodiment 2

[0044] In this embodiment, the method for synthesizing methane by using coal-to-methanol purge gas includes the following main steps:

[0045] (1) The composition of the coal-to-methanol purge gas is shown in Table 1. The coal-to-methanol purge gas is decompressed to 4.0MPa and heat exchanged to about 320°C;

[0046] (2), one-stage methanation reaction: coal methanol purge gas and circulating gas are mixed and heated and then enter the first-stage methanation furnace, and the molar ratio of the recycle gas and the purge gas entering the first-stage methanation furnace is 4:1, , under the action of a nickel-based catalyst, a first-stage methanation reaction is carried out; after the first-stage reaction, the temperature at the outlet of the reaction furnace is 427°C; the nickel-based catalyst is 10% NiO; 50% Al 2 o 3 And 40% MgO, all are mass ratio;

[0047] (3) Second-stage methanation reaction: the synthesis gas after the first-stage methanation reaction is cooled to 400°C ...

Embodiment 3

[0050] In this embodiment, the method for synthesizing methane by using coal-to-methanol purge gas includes the following main steps:

[0051] (1) The composition of the coal-to-methanol purge gas is shown in Table 1. The coal-to-methanol purge gas is decompressed to 5.0MPa, and the heat is exchanged to about 290°C;

[0052] (2), one-stage methanation reaction: coal-based methanol purge gas and circulating gas are mixed and heated, mixed with water vapor and then enter the first-stage methanation furnace, and the molar ratio of the recycle gas to the purge gas entering the first-stage methanation furnace is 2:1, under the action of a nickel-based catalyst, a first-stage methanation reaction is carried out; after the first-stage reaction, the temperature at the outlet of the reaction furnace is 475°C, wherein the nickel-based catalyst is 5% NiO; 45% Al 2 o 3 And 50% MgO, all are mass ratio;

[0053] (3) Second-stage methanation reaction: the synthesis gas after the first-stag...

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Abstract

The invention discloses a method for preparing a liquefied natural gas by utilizing a relief gas of methanol, particularly the relief gas of coal methanol. The method comprises the following steps of: regulating the pressure of the relief gas, heating the mixed gas of the relief gas and a recycle gas, performing methanation reaction under the action of a methanation catalyst to react hydrogen with carbonic oxide and carbon oxide in the relief gas to generate methane and obtain the mixed gas mainly containing the methane, and obtaining the product gas, namely, the liquefied natural gas containing over 95 volume percent of methane by utilizing cryogenic separation technology. The method of the invention has the advantages of obtaining the liquefied natural gas with high methane content, no impurities and high calorific value, making for environmental protection, saving energy sources and blazing a new way for clean energy.

Description

technical field [0001] The invention relates to an application technology of methanol purge gas, in particular to a method for preparing liquefied natural gas from methanol purge gas. Background technique [0002] my country's fossil energy is limited. Among the world's proven reserves, natural gas accounts for only 0.9%, oil accounts for 2.7%, and coal accounts for 15%. At present, my country's natural gas resources are about 54 trillion cubic meters, and the recoverable resources are 10-12 trillion cubic meters. According to the population statistics in 2002, the remaining recoverable reserves of natural gas per capita in my country is only equivalent to 6% of the world average level. [0003] On the other hand, my country's methanol production uses coal as the main raw material. According to data from the Petrochemical Association, there were 177 methanol production enterprises in my country in 2007, with a total production capacity of 16.394 million tons. The latest st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L3/08C10L3/10
Inventor 李泽军张新波杨宽辉
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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