Processing technology for reducing sulfur content of light aromatic hydrocarbon

Abstract

The invention relates to a processing technology for reducing the sulfur content of light aromatic hydrocarbon. The processing technology comprises the following steps: a, additionally arranging a pre-hydrogenation reactor to saturate light sulfur-containing components in raw materials with heavy sulfur-containing components and alkadiene, and reconstructing the flow of an original hydrogenation device to realize full-fraction hydrogenation; b, expanding energy and increasing pressure, optimizing an original heat exchange and hydrotreatment process, and improving the design pressure of equipment at pre-hydrogenation and main hydrogenation parts to eliminating pressure-bearing bottlenecks; c, filtering a feeding with a filter and removing solid particles so as to prevent excessive pressuredrop of the reactor due to blockage caused by the solid particles in the feeding process and guarantee long-period stable operation of the equipment; d, arranging two catalyst bed layers in a selective hydrogenation reactor, and injecting quenching hydrogen between the bed layers to control a reaction temperature; and e, arranging a circulating hydrogen desulfurization tower, and adopting a lean amine solution as an absorbent to improve the purity of circulating hydrogen. After the reaction in the invention, the total sulfur content of the light aromatic hydrocarbon reaches 10 PPm or below, the quality of the aromatic hydrocarbon is improved, product value is increased, a qualified raw material is provided for a subsequent aromatic hydrocarbon extraction device, and a product structure isoptimized.

Description

technical field [0001] The invention relates to the field of chemical hydrodesulfurization, in particular to a processing technology for reducing the sulfur content of light aromatic hydrocarbons. Background technique [0002] The hydrodesulfurization process is that hydrogen removes S, N, O and other heteroatoms in light aromatics under a certain temperature, pressure, and metal sulfides such as MO, Ni, Co, and W as catalysts. Saturation of olefins and hydrogenation of aromatics, thereby improving the quality of aromatics. The main problem in the production of the existing equipment is that the sulfur content of the hydrogenation product is not up to the standard. As a product, it does not meet the environmental protection regulations. Sulfur, nitrogen, oxygen and heavy metals are poisonous to the catalyst and adsorbent in the deep processing of light aromatics, and cannot be used as a product for subsequent deep processing. Raw materials, resulting in low device product v...

AI Technical Summary

Problems solved by technology

The main problem in the production of the existing equipment is that the sulfur content of the hydrogenation product is not up to the standard. As a product, it does not meet the environmental protection regulations. Sulfur, nitrogen, oxygen and heavy metals are poisonous to the catalyst and adsorbent in the deep processing of light aromatics, and cannot be used as a product for subsequent deep processing. Raw materials, resulting in low device product value, single product, no market competitiveness

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