Method for regenerating solvent for desulfurizing and dephophorizing tail gas of yellow phosphorus by sections and used device

Abstract

The invention provides a method for regenerating a solvent for desulfurizing and dephophorizing tail gas of yellow phosphorus by sections and a used device and belongs to the field of gas purification. The method utilizes different reaction speeds of H2S and PH3 in a dephophorization catalyst to divide an adsorber into two sections; the upper section is a desulfurization device; the lower sectionis a dephophorization device; two adsorbers are connected in series to reduce the PH3 content in a yellow phosphorus tail gas outlet to below 0.1mg / m3; and adsorber sets use solvent regeneration respectively to achieve the aim of removing secondary pollution. After the technical measure is adopted, the solvent amount is greatly reduced to regenerate the solvent more easily; and the consumption of the solvent is reduced by 70 percent. The ineffective catalyst is extracted and regenerated by the solvent and is repeatedly used; and the solvent is recycled and used. The method has high dephophorization efficiency and dephophorization precision, does not influence a process of subsequent working procedure, improves the sulfur capacity and phosphor capacity, prolongs the regeneration period, reduces the regeneration consumption, has low purification cost and removes secondary pollution.

Description

technical field [0001] The invention relates to a method for regenerating a phosphorus solvent for segmental desulfurization of yellow phosphorus tail gas and a device used therefor, belonging to the field of gas purification. Background technique [0002] The main component of yellow phosphorus tail gas is high-concentration carbon monoxide, which is not only an energy source but also a valuable one-carbon chemical raw material, but it contains H 2 S, COS, P 4 、PH 3 and other harmful impurities, affecting the utilization of yellow phosphorus tail gas. As the state attaches great importance to energy saving and consumption reduction, strict requirements and standards have been put forward for the utilization of yellow phosphorus tail gas in yellow phosphorus enterprises. The use of yellow phosphorus tail gas must have the technical guarantee of removing harmful impurities. Domestic and foreign removal of H 2 The research and use of the method of S and organic sulfur star...

AI Technical Summary

Problems solved by technology

Domestic and foreign removal of H 2 The research and use of the method of S and organic sulfur started earlier, and there are many mature methods and catalysts at present. The research on the removal method of phosphorus in yellow phosphorus tail gas at home and abroad can be said to have just started. Chinese patent ZL02113667 .X describes the catalytic oxidation purification method of yellow phosphorus tail gas fixed bed. The tail gas is washed with alkaline water and preheated to 50-110°C, and the oxygen content of the tail gas is adjusted to 0.5-2.5%. The tail gas is catalytically oxidized through the catalyst fixed bed from bottom to top , total phosphorus content 3 ; After the catalyst fails, it is activated with air for 4-8 hours, then activated with steam for 2-4 hours, washed with water until neutral, and finally dried with hot air for 24-48 hours. The purification process uses two fixed-bed parallel systems, which is a single The device passes through the fixed bed catalyst from bottom to top, and its disadvantage is that the phosphorus capacity of the catalyst is not high. When the catalyst is not saturated, the outlet pH 3 It has been penetrated, and the regeneration has to be stopped, and the regeneration cycle is short; the dephosphorization effect is not ideal, and the total phosphorus cannot reach 0.1mg / m 3 Requirements, which affect the process of the subsequent process; Catalyst fouling cannot be handled, which will inevitably lead to increased resistance of the catalyst; Catalyst removes H while dephosphorizing 2 S, when regenerated with air, it will cause elemental sulfur to burn and release a large amount of SO 2 , causing ambient air pollution

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