A device for continuously removing thermally stable salts in alkanolamine desulfurization solution using double-membrane stack-magnetoelectric dialysis

Abstract

The invention discloses a technology for continuously removing heat steady salts from an alcohol amine desulfurization solution by using a double-membrane reactor-magnetic electrodialysis method. According to the technology, the heat steady salts can be continuously removed from the alcohol amine desulfurization solution in a purification device by using electricity and water. After the alcohol amine desulfurization solution is purified by the technology, the loss is low, the removal rate of the heat stable salts can reach over 86%, and meanwhile, the alcohol amine loss rate is not higher than 0.57w%, so that the corrosion to equipment and pipelines is retarded effectively, the processing capacity of the amine-method purification device is enhanced, the probability that amine liquid foams and even overflows out of a tower is reduced greatly, and meanwhile, the stability and reliability of process operation are improved; and according to the technology, only a certain amount of electric energy and a certain volume of water are required to be consumed, and the frequent regeneration of acids and salts is not required, so that the effective use cycle is long, the current efficiency is high, and the technology is environmental-friendly. An equipment unit is convenient to assemble, small in floor space and high in operating safety, and automation and intelligentization can be realized; and the maintenance and operating costs are low, and the economic benefit is considerable.

Description

technical field [0001] The present invention relates to a process for removing thermally stable salts in alcoholamine desulfurization solutions by magnetoelectric dialysis, and in particular to a process for continuously removing thermally stable salts in alcoholamine desulfurization solutions by using double-membrane stacks-magnetoelectric dialysis Technology. Background technique [0002] Heat stable salt (hereinafter referred to as HSS) refers to the product formed due to factors such as thermal degradation, chemical degradation and oxidative degradation during the recycling of alcohol amine desulfurization solution, and forms a series of amine salts with alcohol amine, such as ammonium hydrochloride and sulfuric acid Amines, ammonium formate, ammonium acetate, ammonium oxalate, ammonium cyanide, ammonium thiocyanate, ammonium thiosulfate and ammonium sulfite, such amine salts are difficult to resolve from the regeneration tower through temperature changes. During the lo...

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Problems solved by technology

Vacuum distillation purification method, although the treatment is thorough, there are phase changes and a large amount of residue in the operation process, and the energy consumption and material consumption as well as the amount of pollutant treatment are large.

The pretreatment electrodialysis process technology of UC DOW (United Carbon) Company in the United States requires stoichiometric addition of sodium hydroxide in advance, and there is a loss of cations containing alcohol amines, and the amine consumption is large; US patent US 6,517,700, Chinese patent CN 200510038208.3 for alcohol The adhesion and pollution between the amine desulfurization solution and the bipolar membrane are not well resolved, and the current efficiency of long-term operation is low; Chinese patent CN 200610059307.4 provides an electrodialysis technology that only uses electrolyzed water and does not require other chemical reagents. The continuous removal of HSS in the alcohol amine desulfurization solution requires high concentration, viscosity and particle size of the alcohol amine desulfurization solution. At the same time, it is electrolysis rather than ionized water, which consumes a lot of energy; Chinese patent CN 201020272514.X membrane method for removal of desulfurization amine solution The heat-stable salt technology in the medium requires a large amount of lye, and the alkali difference between the two sides of the membrane is large, and the acid and alkali resistance of the membrane is high.

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