Catalyst for dephosphorizing yellow phosphorus tail gas and preparation method thereof

Abstract

The invention provides a catalyst dephosphorizing yellow phosphorus tail gases and a preparation method thereof. The method comprises: dipping a surface treated active carbon carrier into a metal salt solution; and dropping a pyrophosphate or phosphatic solution into the solution after dipping to adjust a pH value to make the solution be alkaline, wherein the metal salt solution and the pyrophosphate or phosphatic solution react to generate a metal phosphate or a pyrophosphate deposition which does not react with a sulfide, the deposition is adhered on the carrier, and the catalyst for dephosphorizing the yellow phosphorus tail gases is obtained after aging, filtrating and drying processes. The catalyst of the invention has strong endurance against sulfides, can make the yellow phosphorus tail gas dephosphorization purification reaction be continuously carried out under a certain reaction condition, and has no need to generation.

Description

technical field [0001] The invention relates to a catalytic reaction process, in particular to a catalyst for dephosphorization of yellow phosphorus tail gas and a preparation method thereof. Background technique [0002] The tail gas produced during the yellow phosphorus production process enters the condensation tower for spray washing, and the phosphorus vapor turns into liquid yellow phosphorus and enters the phosphorus receiving tank. The uncondensed furnace gas is the yellow phosphorus tail gas. The main available components of yellow phosphorus tail gas are CO, accounting for about 80-90%, and the others are dust, water vapor, CH 4 , CO 2 , N 2 , O 2 , arsine, hydrogen fluoride, total sulfur (H 2 S and organic sulfur, in which H 2 S-based), total phosphorus (elemental phosphorus and PH 3 ) and other impurities. [0003] Element content Element content CO 80％～90％ CH 4 ～0.3％ N 2 2～5％ Total sulfur ...

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Problems solved by technology

[0007] The above specific representative prior art has the following problems: the catalyst needs to be regenerated after being used for a period of time, and the regeneration process not only increases the complexity of the equipment and operation, but for the catalyst, repeated regeneration often causes the active center to degenerate. Gradually inactivate

In addition, the sulfide contained in the yellow phosphorus tail gas can easily cause the chemical change of the active center, which leads to the deactivation of the catalyst.

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