Kansai Electric Power has been granted a patent for a composite amine absorbent that can effectively absorb CO2 or H2S gases. The absorbent is made by dissolving a linear monoamine, a diamine, and a propylene glycol alkyl ether in water. The absorbent has a synergistic effect that enhances its absorbability and releasability of CO2 or H2S during regeneration. Additionally, it reduces the amount of water vapor in the regeneration process. GlobalData’s report on Kansai Electric Power gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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Composite amine absorbent for co2 and h2s absorption
A recently granted patent (Publication Number: US11772041B2) discloses a composite amine absorbent for removing carbon dioxide (CO2) or hydrogen sulfide (H2S) from gas streams. The absorbent is obtained by dissolving a linear monoamine, a diamine, and an ether bond-containing compound in water. The ether bond-containing compound is represented by chemical formula (I), where R1 is a hydrocarbon group with 2 to 4 carbon atoms, R2 is a propylene group, R3 is hydrogen, and n is 1 to 3.
In one embodiment, the ether bond-containing compound is propylene glycol alkyl ether, with alkyl ether options including ethyl ether, propyl ether, and butyl ether. Another embodiment involves using an ether bond-containing compound represented by chemical formula (II), where R4 is an acetyl group, R5 is an ethylene group, R6 is an alkyl group, and n is 1. In this case, the ether bond-containing compound is ethylene glycol alkyl ether acetate, with methyl ether and ethyl ether as options for the alkyl ether.
The composite amine absorbent can include various types of linear monoamines, diamines, and ether bond-containing compounds. The total concentration of the linear monoamine and diamine in the absorbent is 40 to 60% by weight based on the total weight of the absorbent. The mixing ratio of the diamine and ether bond-containing compound to the linear monoamine is 0.35 to 1.1, and the weight ratio of the ether bond-containing compound to the diamine is 0.99 to 7.8.
The patent also describes a method for removing CO2 or H2S from gas streams using the composite amine absorbent. The method involves bringing the gas into contact with the absorbent in an absorber to remove CO2 or H2S, and then removing the absorbed CO2 or H2S from the rich solution to obtain a lean solution in an absorbent regenerator. The lean solution can be reused to remove CO2 or H2S from the gas in the absorber. The temperature in the absorber during contact with the gas is 30 to 80°C, and the temperature for obtaining the lean solution in the regenerator is 110°C or higher. The CO2 partial pressure at the absorber's inlet is a low partial pressure of 0.003 to 0.1 MPa.
Overall, this patent presents a composite amine absorbent and a method for efficiently removing CO2 or H2S from gas streams. The disclosed absorbent composition and process parameters offer potential improvements in CO2 and H2S removal technologies, which can have significant applications in industries such as natural gas processing and carbon capture.
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GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.
