Claus Tail Gas Advanced Purification Catalytic Reduction Oxidation Process and Its Catalyst Used

Abstract

The invention relates to a claus tail gas deep purification catalytic reduction oxidation process and a catalyst used by the claus tail gas deep purification catalytic reduction oxidation process and belongs to the field of claus tail gas purification treatment. According to the process, a low temperature reduction sulfur dioxide catalyst is adopted, H2S contained in the claus tail gas is used as a reduction medium, and SO2 contained in the claus tail gas is directly reduced and translated to sulphur; treated claus tail gas is subjected to oxygen replenishment, and the residual H2S in the tail gas is further translated to sulphur and sulfur dioxide under the action of a deep selection oxidation catalyst; purified tail gas is obtained simultaneously. The low temperature reduction sulfur dioxide catalyst is prepared from the following components by mass percent: 82-94% of anatase titanium dioxide, 4-16% of aluminium oxide and the balance of additives. By utilizing the claus tail gas deep purification catalytic reduction oxidation process, a catalytic reduction oxidation method is adopted, the yield of total sulfur of claus tail gas is high, system tail gas meets new national standards that SO2 content is less than or equal to 400mg / m<3> and H2S content is less than or equal to 5mg / m<3>, and the system tail gas can be directly discharged without an incinerator.

Description

technical field [0001] The invention relates to a Claus tail gas deep purification catalytic reduction oxidation process and a catalyst used therein, and belongs to the field of Claus tail gas purification treatment. Background technique [0002] The traditional Claus sulfur recovery process is divided into two components: the Claus process and the tail gas treatment. Since the equilibrium constant of the Claus reaction itself is small, the sulfur yield is generally <97%, so the tail gas treatment must be configured to further improve the sulfur recovery. rate and reduce emissions. Therefore, in a certain sense, the level of tail gas treatment technology determines the sulfur yield and tail gas emission level. At present, the reduction and absorption method is the most advanced and representative in the tail gas treatment technology. The specific process is to convert the tail gas after the secondary or tertiary Claus conversion through hydrogenation conversion catalysis...

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Problems solved by technology

[0004] Since my country has not yet promoted tail gas catalytic incineration technology, the exhaust gas is treated by thermal incineration, which consumes a lot of gas, and the comprehensive cost of tail gas treatment is very high.

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