Method for removing trace sulfide in benzene

Abstract

The invention discloses a method for removing trace sulfide in benzene, which comprises the following steps: filling a fixed bed reactor with a desulfurization catalyst, introducing a sulfur-containing benzene solution into the fixed bed reactor to perform adsorption desulfurization treatment, controlling the temperature of the fixed bed reactor to be 120-150 DEG C, the reaction pressure to be 0.1 Mpa to 0.5 Mpa and the air speed to be 2-10 h-1, and controlling the catalyst to comprise an active component, an assistant and a porous carrier, wherein the auxiliary agent and the active component are wrapped by the porous carrier to form a core-shell structure, the active component is one or two of palladium and ruthenium, the auxiliary agent is one or more of cerium oxide, cobalt oxide, silver oxide, copper oxide, nickel oxide and iron oxide, the porous carrier is a ZSM-5 molecular sieve, CO-520 and cyclohexane are added into preparation of an active component, an assistant precipitate and a ZSM-5 molecular sieve precursor to form a microemulsion, so that groups in the generated precursor of the active component and the assistant precipitate are combined with hydroxyl and the like of a generated molecular sieve to form the core-shell catalyst.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a method for removing trace sulfides in benzene. Background technique [0002] As an important synthetic intermediate, benzene is often used as a raw material for the production of high value-added products such as cyclohexene. The trace amount of sulfur in benzene can easily poison some catalysts in the downstream reaction of benzene, resulting in a decrease in the life of the catalyst As a result, the reaction efficiency is reduced and the continuous production is affected. In the production process of refined benzene, the existing desulfurization methods include extractive distillation or critical hydrodesulfurization using solvents such as sulfolane and formylmorpholine, etc. The above methods have the characteristics of complicated processes or harsh conditions, and cannot achieve the The trace sulfur in refined benzene is removed to a level that canno...

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Problems solved by technology

[0002] As an important synthetic intermediate, benzene is often used as a raw material for the production of high value-added products such as cyclohexene. The trace amount of sulfur in benzene can easily poison some catalysts in the downstream reaction of benzene, resulting in a decrease in the life of the catalyst As a result, the reaction efficiency is reduced and the continuous production is affected.

In the production process of refined benzene, the existing desulfurization methods include extractive distillation or critical hydrodesulfurization using solvents such as sulfolane and formylmorpholine, etc. The above methods have the characteristics of complicated processes or harsh conditions, and cannot achieve the The trace amount of sulfur in refined benzene is removed to a level that cannot be detected by existing testing methods. Therefore, the removal method of trace amount of sulfide in benzene needs to be further expanded to improve the efficiency of desulfurization

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