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Absorption liquid for removing CO2 from LNG feed gas

A technology for absorbing liquid and raw gas, applied in the direction of fuel, gas fuel, gas treatment, etc., to achieve the effect of obvious utility and high decarbonization rate

Inactive Publication Date: 2020-01-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CO 2 The choice of removal process depends on many factors, not only the characteristics of the method itself, but also the entire process flow, combined with raw material routes, processing methods, public works costs, etc., and no one method can be applied to various condition

Method used

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  • Absorption liquid for removing CO2 from LNG feed gas

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0022] Solution composition: 20% wt of methyldiethanolamine, 5% wt of diethanolamine, 15% wt of N-hydroxyethylpiperazine, 5% wt of morpholine, 0.01% wt of simethicone, 0.005% wt of tributyl phosphate, and the rest for water. Pressure 1.5MPa, raw material gas 1%, purified gas CO 2 35ppm.

example 2

[0024] Solution composition: methyldiethanolamine 15% wt, monoethanolamine 5% wt, N-hydroxyethylpiperazine 15% wt, aminoethylpiperazine 5% wt, simethicone 0.020% wt, tributyl phosphate 0.020% wt, the rest is water. Pressure 1.5MPa, raw material gas 1%, purified gas CO 2 35ppm.

example 3

[0026] Methyldiethanolamine 10%wt, monoethanolamine 15%wt, diethanolamine 10%wt, N-hydroxyethylpiperazine 15%wt, piperazine 5%wt, simethicone 0.020%wt, tributyl phosphate 0.035% wt, the rest is water. Pressure 1.5MPa, raw material gas 5.0%, purified gas CO 2 50ppm.

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Abstract

The invention belongs to the technical field of gas purification, and relates to absorption liquid for removing CO2 from LNG feed gas. The absorption liquid for removing the CO2 from the LNG feed gasis prepared from alkylol amine, sterically hindered amine, defoamers and water. By adopting the absorption liquid for removing the CO2 from the LNG feed gas, the CO2 in the LNG feed gas can be effectively removed. Under the conditions that the LNG feed gas pressure is 1.5-6.0 MPa, the temperature is 20-40 DEG C and the CO2 content is between 1% and 5%, after purification, the CO2 in purified gas is less than or equal to 50 ppm, and an LNG purification index is reached.

Description

technical field [0001] The invention belongs to the field of gas purification, in particular to a method for removing CO from LNG raw material gas 2 of the absorbent. Background technique [0002] LNG is the cleanest energy among all fossil fuels, with a high ratio of hydrogen to carbon and CO emissions 2 And the advantages of less pollutants can make outstanding contributions to the reduction of the earth's greenhouse effect and air pollution. Due to the increasing energy demand in our country and stricter environmental protection requirements, the development of natural gas in our country is increasing, and the efficient treatment of LNG gas is also very important. There is an urgent need to find a method for removing CO from LNG gas 2 The absorption liquid is used to adapt to the new national natural gas purification standard. [0003] The alkanolamine method has always been the mainstream method for natural gas purification. In recent decades, the continuous develop...

Claims

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Application Information

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IPC IPC(8): C10L3/10B01D53/78B01D53/62
CPCB01D53/62B01D53/78B01D2252/20405B01D2257/504C10L3/104Y02C20/40
Inventor 毛松柏宋丽朱道平
Owner CHINA PETROLEUM & CHEM CORP