A membrane device for catalytic gasoline desulfurization and refining

Abstract

The invention relates to membrane device for desulfurizing and refining catalytic gasoline. The membrane device mainly comprises a raw material tank, a feed pump, a bag-type filter, a preheater, a first-grade membrane separating system, a second-grade separating system, a cooler, a micro-filtration membrane filter, a refined oil storage tank, a condensing tower, a buffer tank, a vacuum pump, a recovery tower and a high-sulfur rich-impurity oil tank, wherein a lower portion of the raw material tank is connected with an inlet of the feed pump, an outlet of the feed pump is connected with an inlet of the bag-type filter, an outlet of the bag-type filter is connected with an inlet of the preheater, an outlet of the preheater is connected with a feed inlet of the first-grade membrane separating system, a purified oil outlet of the first-grade membrane separating system is connected with a feed inlet of the second-grade separating system, a purified oil outlet of the second-grade separating system is connected with an inlet of the cooler, an outlet of the cooler is connected with an inlet of the micro-filtration membrane filter, an outlet of the micro-filtration membrane filter is connected with the refined oil storage tank, an outlet of the condensing tower is connected with the buffer tank which is connected with an air inlet of the vacuum pump, an air outlet of the vacuum pump is connected with the recovery tower, and an outlet of the recovery tower is communicated with the atmosphere.

Description

technical field [0001] The invention belongs to the technical field of refining oil products in the petroleum refining industry, and relates to a membrane device for catalytic gasoline desulfurization and refining. Background technique [0002] The processing volume of high-sulfur crude oil in my country is increasing year by year, heavy oil catalytic cracking has been popularized, catalytic gasoline accounts for more than 85% of finished gasoline, and the sulfur contained in catalytic gasoline accounts for about 90%-98% of the total sulfur content of gasoline. Active thiols and inactive disulfides, thioethers, thiophenes, benzothiophenes and their derivatives exist. Therefore, it has become an urgent task for my country's oil refining industry to carry out extensive research on FCC gasoline desulfurization and refining technology to reduce the sulfur content in FCC gasoline. Hydrodesulfurization is a relatively mature and commonly used desulfurization refining method at pre...

AI Technical Summary

Problems solved by technology

Hydrodesulfurization is a relatively mature and commonly used desulfurization refining method at present. This method can effectively remove inorganic sulfur and simple organic sulfur compounds, but it is difficult to remove fused-ring thiophene sulfur-containing compounds and their derivatives. Moreover, harsh conditions such as high temperature, high pressure, hydrogen environment and precious metal catalysts are required, and equipment investment and operating costs are relatively high, which will also cause a large loss of gasoline octane number during desulfurization.

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