Separation process for synthesizing mercaptoethanol by using hydrogen sulfide in crude gas

Abstract

The invention discloses a separation process for synthesizing mercaptoethanol by using hydrogen sulfide in crude gas, and relates to a new separation and purification process for synthesizing mercaptoethanol by utilizing hydrogen sulfide in crude gas. The obtained mercaptoethanol is mainly used for telogen such as polyvinyl chloride, polyacrylonitrile, polystyrene and the like. In the separation process, a rectifying tower, a condensation cooler, a front fraction tank, a finished product tank, a buffer tank and a vacuum unit are mainly involved. The process comprises the following steps of: adding a liquid crude product mercaptoethanol with content of about 90 percent into a tower kettle of the rectifying tower, and starting the vacuum unit, the buffer tank, a tower kettle heater and a tower top condenser; and heating the tower kettle of the rectifying tower slowly and continuously, when the vacuum degree of a system is more than or equal to 0.095 MPa and the temperature of the tower kettle reaches 150 DEG C, boiling and gasifying the liquid mercaptoethanol in the tower kettle of the rectifying tower, totally refluxing by the condensation cooler for a certain time, and extracting a finished product at the constant tower top temperature of about 70 DEG C and feeding into the finished product tank. The process is simple, and low in production cost, the product is high in quality and purity; and through detection, the mercaptoethanol content of the product is more than or equal to 99 percent.

Description

technical field [0001] The invention relates to a new separation and purification process for synthesizing mercaptoethanol by using hydrogen sulfide in crude gas. The obtained mercaptoethanol is mainly used as a telogen for polyvinyl chloride, polyacrylonitrile, polystyrene, polyacrylate, etc. Background technique [0002] In coal gasification and coking production, the crude gas produced by gasifiers and coke ovens contains a lot of hydrogen sulfide acid gas, which not only seriously corrodes gas pipelines and equipment, but also produces sulfur dioxide and sulfur trioxide after combustion. It will seriously pollute the environment. If coal gas is used as raw material to produce one-carbon chemical products, the sulfur in it will easily cause catalyst poisoning, so the crude gas must be desulfurized. At present, most of my country's gas plants and coking plants use the Claus sulfur recovery method to convert hydrogen sulfide into sulfur, and the economic return rate is low...

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Problems solved by technology

[0002] In coal gasification and coking production, the crude gas produced by gasifiers and coke ovens contains a lot of hydrogen sulfide acid gas, which not only seriously corrodes gas pipelines and equipment, but also produces sulfur dioxide and sulfur trioxide after combustion. It will seriously pollute the environment. If coal gas is used as raw material to produce one-carbon chemical products, the sulfur in it will easily cause catalyst poisoning, so the crude gas must be desulfurized

At present, most of my country's gas plants and coking plants use the Claus sulfur recovery method to convert hydrogen sulfide into sulfur, and the economic return rate is low. Enterprises urgently need more economical use of waste hydrogen sulfide, so it is potential to develop high value-added hydrogen sulfide conversion products. must do

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