Coking crude benzol hydrogen desulfurization process

Abstract

The invention discloses a coking crude benzol hydrogen desulfurization process, wherein a mixture of coking crude benzol and hydrogen enters a pre-reactor from a tower top, the pre-reactor is filled with a NiMo catalyst, the reaction temperature is 220-230 DEG C, the hydrogenation pressure is 3.2-3.8MPa, pre-reacted products enter a fixed bed reactor, the fixed bed reactor is filled with a hydrogen desulfurization catalyst, and the catalyst comprises a carrier and an active component; the carrier is SAPO-5, and a heteroatom Cu2<+> is doped into a synthesis framework structure of the SAPO-5; the active component is a mixture of Mo2N, W2N, Mo2C and WC; the catalyst further comprises a catalytic additive, and the catalytic additive is a mixture of TiO2, CeO2, V2O5 and NbOPO4. The reaction conditions of the fixed bed reactor are as follows: the reaction temperature is 320-380 DEG C, the hydrogenation pressure is 3.0-3.6MPa, the hydrogen to oil volume ratio is 500-800, and the volume space velocity is 1.5-2h<1>. A product subjected to a fixed bed hydrogenation reaction enters an extractive distillation unit, and arene is obtained. The process reduces the total sulphur content of the coking crude benzol to be lower than 0.1ppm, and meets extensive applications.

Description

technical field [0001] The invention relates to a hydrodesulfurization process, in particular to a hydrodesulfurization process of coking crude benzene. Background technique [0002] Coking is one of the main methods of coal processing. It is also called high-temperature dry distillation of coal, that is, bituminous coal suitable for coking is properly treated and heated to 950-1050°C in a coke oven with air isolation. After drying, pyrolysis, The stages of burning, bonding, solidification and shrinkage finally make coke. Volatile substances precipitated during the coking process include chemical products such as gas, tar, ammonia and crude benzene. In addition, the coal tar obtained in the coking process also contains a certain amount of aromatics such as benzene. [0003] The refining of coking crude benzene uses coking crude benzene as raw material, and removes harmful substances such as sulfur and nitrogen in it through physical or chemical methods, so as to obtain hig...

AI Technical Summary

Problems solved by technology

However, the sulfur content of pure benzene obtained by the above-mentioned process is about 0.5ppm, which greatly restricts the use of aromatic products.