Abstract
Various novel amine solutions both in aqueous and non-aqueous [monoethylene glycol (MEG)/triethylene glycol(TEG)] forms have been studied for hydrogen sulfide (H2S) absorption. The study was conducted in a custom build experimental setup at temperatures relevant to subsea operation conditions and atmospheric pressure. Liquid phase absorbed H2S, and amine concentrations were measured analytically to calculate H2S loading (mole of H2S/mole of amine). Maximum achieved H2S loadings as the function of pKa, gas partial pressure, temperature and amine concentration are presented. Effects of solvent type on absorbed H2S have also been discussed. Several new solvents showed higher H2S loading as compared to aqueous N-Methyldiethanolamine (MDEA) solution which is the current industrial benchmark compound for selective H2S removal in natural gas sweetening process.
Highlights
Natural gas is considered one of the cleanest forms of fossil fuel
When looking into the amine structure, the results show that an increase in alkyl group decreases the Hydrogen Sulphide (H2 S) loading in an amino-ethanol group, i.e., DMAE > DEAE (DEEA) > DBAE
Various new aqueous and non-aqueous amine blends have been tested for H2 S
Summary
Natural gas is considered one of the cleanest forms of fossil fuel. Its usage in industrial processes and human activities is increasing worldwide, providing 23.4% of total world energy requirement in2017 [1]. Natural gas is half of the price of crude oil and produces 29% less carbon dioxide than oil per unit of energy output [2]. Methane is a major energy providing component in natural gas. It contains other hydrocarbons and a variety of impurities like acid gasses (CO2 and H2 S) and water. Besides reducing the gas energy value, the impurities can cause operational problems such as corrosion in the pipeline and other equipment [3]. Mercaptans and other sulfur components are often found in natural gas and must be removed. It is necessary to remove acid gases, water vapors, and other impurities before the usage of natural gas
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