Hydrofining method of secondarily processed gasoline fractions

Abstract

The invention discloses a hydrofining method of secondarily processed gasoline fractions. The method comprises the following steps of: mixing secondarily processed gasoline fraction raw materials and hydrogen and entering into heat-exchanging moderating pre-hydrogenation equipment; increasing the material temperature through heat exchange through pre-hydrogenation and enabling the material to enter heating equipment after heat exchange and moderating pre-hydrogenation; then, entering a hydrofining reactor; carrying out a hydrofining reaction of the raw materials under the hydrofining condition; and exchanging heat among the effusion of the hydrofining reaction with the secondarily processed gasoline fraction raw materials and the hydrogen in the heat-exchanging moderating pre-hydrogenation equipment. Compared with the prior art, the method of the invention can effectively delay the rise of the pressure fall of the reactor and ensure the long-period rotation of the hydrogenation device.

Description

technical field [0001] The invention belongs to the hydroprocessing technology. Specifically, it is a method of secondary processing gasoline fraction to hydrogenate diolefins at a lower temperature and prolong the operation period of the device. Background technique [0002] As crude oil continues to become heavier and the depth of crude oil processing continues to increase, the processing of heavy oil products plays an increasingly important role in the refining process. Thermal processing processes such as delayed coking, visbreaking, and catalytic cracking are simple in technology and low in investment. It has increasingly become an important means for oil refineries to deal with residual oil and increase the yield of light oil. Due to the high content of impurities such as unsaturated hydrocarbons, sulfur, and nitrogen in the light distillate oil of this type of device, especially naphtha, and its poor stability, it is difficult to be used as the feed material for the ...

AI Technical Summary

Problems solved by technology

Secondary processing gasoline has a high content of unsaturated compounds such as olefins and dienes. These unsaturated compounds are extremely unstable, especially dienes, which are prone to Diels-Alder cyclization reaction and polymerization reaction to form macromolecular organic compounds after heating, and further condensation Coke formation, causing the catalyst bed pressure difference in the reactor to rise

The high-temperature effluent of the secondary processing naphtha hydrogenation unit needs to exchange heat with the raw material to recover and utilize the heat. In the heat exchanger and heating furnace, the diolefins in the raw material are also easy to shrink and coke, which will reduce the heat transfer in the initial stage. Efficiency, later need to stop processing

It is described that the material passes through an adsorbent bed containing alumina and silica, and absorbs and removes silicon compounds at a suitable temperature. This method has a long process flow, and caustic alkali is required for the regeneration of the desorbent, causing unnecessary environmental pollution.

The above-mentioned desiliconization methods are not suitable for naphtha hydrogenation units, and neither solves the problem of coking in the shell side of the raw material and produced oil heat exchanger and the furnace tube of the heating furnace

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