Method and device for recycling carbon disulfide from hydrogen sulfide tail gas during preparation of carbon disulfide

Abstract

The invention discloses a method and device for recycling carbon disulfide from hydrogen sulfide tail gas during preparation of carbon disulfide. The method comprises the steps that the hydrogen sulfide tail gas containing carbon disulfide is introduced into a waste gas collector during preparation of carbon disulfide; the hydrogen sulfide tail gas which contains carbon disulfide and is contained in the waste gas collector is fed into a hydrogen sulfide compressor, the pressurized hydrogen sulfide tail gas containing carbon disulfide is fed into a condenser for condensation, liquid hydrogen sulfide is recycled, and gas hydrogen sulfide is conveyed into a hydrogen sulfide conveyance pipe to enter the hydrogen sulfide treatment process. The device comprises the waste gas collector, the compressor, the condenser, a carbon disulfide collector and the hydrogen sulfide conveyance pipe. According to the whole technology system, waste and sewage are not generated, so that carbon disulfide industrial production meets technological conditions of totally clean production, and production consumption is reduced to the maximum extent.

Description

technical field [0001] The invention relates to the technical field of recovering carbon disulfide in hydrogen sulfide gas, in particular to a method for recovering carbon disulfide from hydrogen sulfide tail gas containing carbon disulfide in the process of utilizing natural gas to prepare carbon disulfide. Background technique [0002] Carbon disulfide is an indispensable heavy chemical raw material for viscose production. With the rapid development of my country's chemical fiber industry, the demand for carbon disulfide production capacity is also increasing. However, the existing carbon disulfide production process will produce a large amount of harmful gases, such as sulfur dioxide and water pollution. Carbon disulfide-producing countries have specially formulated relevant industry standards for the purpose of monitoring or reducing work related to environmental pollution. [0003] In the production process of carbon disulfide, the tail gas from multiple system units suc...

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Problems solved by technology

[0003] In the production process of carbon disulfide, the tail gas from multiple system units such as carbon disulfide separation, desulfurization, and fine retention in the preparation process contains CS 2 Hydrogen sulfide tail gas, the existing technology is to adopt water sealer to collect CS 2 The recovery of carbon disulfide by the water sealer will produce sewage. Gas hydrogen sulfide contains a large amount of water after contact with water, which is not conducive to compression recovery, and the water content of hydrogen sulfide is highly corrosive. The by-product hydrogen sulfide produced by carbon disulfide is sent through the system pressure. Until the sulfur is recycled into sulfur by the Claus process, the exhaust gas in the preparation process has basically no pressure or the gauge pressure is close to 0, so it cannot be sent to Claus for recovery, so the method of not recycling is finally adopted and discharged to the flue of the heating furnace In the method of incineration for export, the sulfur dioxide produced after incineration will pollute the atmosphere, that is, industrial tail gas pollution, which is not conducive to environmental protection. At the same time, the emission of hydrogen sulfide gas is also a waste of source materials, which affects product consumption.

[0004] The existing tail gas treatment system has the following defects: the tail gas, that is, the separation, desulfurization, and purification of multiple process points in the preparation process of carbon disulfide, will produce a small amount of hydrogen sulfide gas containing carbon disulfide, and the tail gas cannot be effectively recovered. The environment is polluted, and the process of recycling carbon disulfide will produce industrial sewage. In addition, the incineration of hydrogen sulfide gas itself is also a waste, which directly affects product consumption

This method adopts the absorption method to recover carbon disulfide, which is difficult to recover the tail gas without pressure, and the equipment cost is too high, and the control is difficult, so it is not suitable for the recovery of the tail gas or waste gas of this system.

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