Method for recovering liquid sulfur containing carbon disulfide and hydrogen sulfide

Abstract

The invention relates to a method for recovering liquid sulfur containing carbon disulfide and hydrogen sulfide. The liquid sulfur is recovered after the liquid sulfur is introduced in a sulfur receptor. The invention is characterized in that the liquid sulfur from the sulfur receptor is directly introduced into a Clause system for further recovery; and the liquid sulfur in the sulfur receptor comprises the following components by mass percent: 93.5-96 percent of liquid sulfur, 0.5-4.0 percent of carbon disulfide and 1.0-3.5 percent of hydrogen sulfide. The invention adopts the Clause system to directly recover excessive liquid sulfur containing carbon disulfide and hydrogen sulfide and effectively improves the recovery efficiency and the operation safety of the liquid sulfur. The process flow of the method is simple, the equipment used in the method is less and the cost is effectively reduced. Moreover, by adopting the method of the invention, the total recovery rate of sulfur can reach 99.5 percent and the environmental pollution is hardly caused.

Description

technical field [0001] The invention relates to the separation and recovery of liquid sulfur, in particular to a method for the separation and recovery of liquid sulfur containing carbon disulfide and hydrogen sulfide. Background technique [0002] The preparation of carbon disulfide and hydrogen sulfide by using natural gas and sulfur as raw materials is a widely used production process at present, mainly including low-pressure method and high-pressure method. Regardless of the process method, in order to allow the natural gas to completely react in the actual production process, the proportion of excess sulfur in the raw material ratio is generally 5% to 10%, and the excess liquid sulfur needs to be recovered after the reaction is completed. and reuse. [0003] In the production process of carbon disulfide and hydrogen sulfide, after the reaction of natural gas and sulfur is completed, the excess sulfur is condensed and captured by a condenser and a sulfur trap, and the c...

AI Technical Summary

Problems solved by technology

In the low-pressure process, the separation method is as follows: liquid sulfur enters the liquid sulfur flasher through the sulfur capture carbon trap → sulfur receiver → liquid sulfur flasher, and separates liquid sulfur from carbon disulfide and hydrogen sulfide through flash evaporation; Liquid sulfur is recovered from the bottom of the flash evaporator to the liquid sulfur storage tank for reuse. Carbon disulfide and hydrogen sulfide gas from the flash evaporator pass through the sulfur sinker→cooler→water sealer to recover a small amount of crude carbon disulfide. The remaining tail gas enters the chimney for combustion and is discharged directly. The disadvantage of this separation method is that the process is more complicated, more equipment is required, the separation is incomplete, the liquid sulfur in the liquid sulfur storage tank is often mixed with carbon disulfide gas, which makes the safety not good, and the direct evacuation of a large amount of tail gas combustion is easy to cause air pollution etc.

In the high-pressure process, the liquid sulfur recovery method containing carbon disulfide and hydrogen sulfide is as follows: a stream of high-temperature gas is introduced from the Clause system into the liquid sulfur equipment, and liquid sulfur is separated from carbon disulfide and hydrogen sulfide by flash evaporation. Recycling from the bottom of the equipment, carbon disulfide and hydrogen sulfide are introduced into the Clause system to be converted into sulfur for recycling; the liquid sulfur recovery method of the high-pressure method for preparing carbon disulfide and hydrogen sulfide is ingenious, the equipment and operation method are simple, and the safety is high, but its main The problem is that the investment cost is high

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