| A series of compound desulfurizers and physico-chemical compound desulfurizers for liquified petroleum gas were developed and the foaming properties of desulfurizers were studied. Vapour-liquid equilibrium of H2S in aqueous solution of sterically hindered amine was measured and the model of the vapour-liquid equilibrium was developed based on electrolyte solution theory.The composition of compound desulfurizers for liquified petroleum gas was determined by GC-MS and FT-IR. The desulfurization effect of ethanol-amine desulfurizers and compound desulfurizers was examined. The effect of concentration of diisopropanol amine on absorptivity for overall sulfur was investigated. The influence of concentration and operation temperature of physical solvents, such as polyethylene glycol dimethyl ethers, solfolane and N-methyl-2-pyrrolidone, on desulfurization effect was studied. The influence of those physical solvents after regeneration on desulfurization effect was also investigated. The reason that the absorptivity of physical solvents for overall sulfur decreased after regeneration was studied. A measure for prevention oxidation degration of the physical solvents in practical production process was proposed. New type sterically hindered amine desulfurizers, l,8-diazabicyclo-[5,4,0]-undec-7-ene and hexamethylenetetramine were developed based on desulfurization mechanism of sterically hindered amine. The influence of concentration and operation temperature of l,8-diazabicyclo-[5,4,0]-undec-7-ene and hexamethylenetetramine on desulfurization effect was studied.The effect of addition of diethanolamine, triacetamide, diisopropanol or 1,8-diazabi-cyclo-[5,4,0]-undec-7-ene on absorptivity of methyldiethanolamine solution for sulfur was investigated. A series of compound desulfurizers were developed.Physical solvents, such as polyethylene glycol dimethyl ethers, solfolane and N-methyl-2-pyrrolidone, replaced water in compound desulfurizers. A series of physico-chemical compound desulfurizers were developed. The influence of operation temperature on desulfurization effect of physico-chemical compound was studied. The result shows that low operation temperature was in favor of physico-chemical compound desulfurizers to keep higher absorptivity for overall sulfur. In order to reduce the cost, the composition of physico-chemical compound desulfurizers obtained was optimized. The influence of the sulfur content fluctuation of feed ondesulfurization effect of optimized physico-chemical compound desulfurizers was also investigated. The purified depth and sulfur load of the optimized physico-chemical compound desulfurizer were higher than YXS-99 compound desulfurizer.The effect of particles size and concentration of Fe(OH)3, FeS and active carbon on foaming property of methyldiethanolamine solution, SDS-1, SDS-3 and SDS-5 desulfurizers was studied. A measure for eliminating the effect of particles on desulfurizers was proposed. The effect of operation temperature and N2 flow rate on foaming property of methyldiethanolamine solution, SDS-1, SDS-3 and SDS-5 was also investigated.Vapour-liquid equilibrium data of H2S in aqueous solution of 1,8-diazabicyclo-[5,4,0]-undec-7-ene was obtained pour-liquid equilibrium model was developed based on the theory of electrolyte. The average deviation of predicted value from experimental value was less than ±40%. |
PDF Full Text Request