Selective H2S Absorption Using the Mixture of NaOH-NaHCO3-Na2CO3 Buffer Solvent Solution

IF 0.9 Q3 ENGINEERING, MULTIDISCIPLINARY

Journal of Engineering and Technological Sciences Pub Date : 2022-09-16 DOI:10.5614/j.eng.technol.sci.2022.54.5.13

A. Raksajati, Hadi Purwanto, A. N. Baskoro, A. Indarto, D. Ariono

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引用次数: 1

Abstract

Acid gas enrichment unit (AGEU) involves selective separation of H2S from acid gas mixture, for example using absorption with an NaOH solvent solution. Sodium carbonate (Na2CO3) and sodium bicarbonate (NaHCO3) buffer addition to NaOH solution suppresses CO2 absorption, thereby increasing the selectivity of H2S absorption. This study evaluated the effect of buffer addition to increase H2S absorption selectivity using an NaOH solution. It was shown that both buffer addition and L/G ratio decrease could increase H2S selectivity by limiting CO2 absorption. Based on the simulation results, in the 0.006 to 0.030 L/G ratio range and NaOH solvent concentration greater than 2%-mass, the addition of NaHCO3 with mass ratio greater than 1.5:1 to NaOH and the addition of Na2CO3 at 1.26 times NaHCO3’s mass increased H2S absorption selectivity up to 17.3%. The combination of an L/G ratio of 0.006 and solvent with a composition of 5%-mass NaOH, 15%-mass NaHCO3, and 18.9%-mass Na2CO3 produced the highest H2S selectivity of 23.1 (379.7% H2S selectivity increase).

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NaOH-NaHCO3-Na2CO3缓冲溶剂溶液选择性吸收H2S

酸性气体富集装置(AGEU)涉及从酸性气体混合物中选择性分离H2S，例如使用NaOH溶剂溶液进行吸收。NaOH溶液中加入碳酸钠(Na2CO3)和碳酸氢钠(NaHCO3)缓冲液抑制CO2吸收，从而提高H2S吸收的选择性。本研究评估了在NaOH溶液中添加缓冲液对提高H2S吸收选择性的影响。结果表明，加入缓冲液和降低L/G比都可以通过限制CO2的吸收来提高H2S的选择性。模拟结果表明，在0.006 ~ 0.030 L/G范围内，NaOH溶剂浓度大于2%-质量，NaHCO3质量比大于1.5:1和Na2CO3质量比为1.26倍的NaHCO3对H2S的吸附选择性提高到17.3%。当L/G比为0.006,NaOH质量为5%，NaHCO3质量为15%，Na2CO3质量为18.9%时，H2S选择性最高，达到23.1 (H2S选择性提高379.7%)。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Engineering and Technological Sciences ENGINEERING, MULTIDISCIPLINARY-

CiteScore

2.30

自引率

11.10%

发文量

审稿时长

24 weeks

期刊介绍： Journal of Engineering and Technological Sciences welcomes full research articles in the area of Engineering Sciences from the following subject areas: Aerospace Engineering, Biotechnology, Chemical Engineering, Civil Engineering, Electrical Engineering, Engineering Physics, Environmental Engineering, Industrial Engineering, Information Engineering, Mechanical Engineering, Material Science and Engineering, Manufacturing Processes, Microelectronics, Mining Engineering, Petroleum Engineering, and other application of physical, biological, chemical and mathematical sciences in engineering. Authors are invited to submit articles that have not been published previously and are not under consideration elsewhere.