Method for producing benzene and xylene from catalytic cracking light oil
A catalytic cracking and light oil technology, applied in chemical instruments and methods, bulk chemical production, organic chemistry, etc., can solve problems such as low yield, achieve low severity, control consumption, and suppress side reactions
Active Publication Date: 2020-02-07
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
[0007] The technical problem to be solved by the present invention is to mainly solve the problem of low yield of the conversion of LCO raw materials into aromatic hydrocarbons in the prior art, and provide a method for producing benzene and xylene by catalytic cracking light diesel oil
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Embodiment 1
[0024]After mixing catalytic cracking light oil with a boiling point of 150-380°C and hydrogen, it enters a hydrotreating reactor to remove sulfur and nitrogen. The sulfur content in the raw material is 8500wtppm, and the nitrogen content is 1200wtppm, and the condensed aromatic hydrocarbons with more than two rings are saturated Until one aromatic ring remains, Table 3 lists the catalysts and reaction conditions used. Before feeding, the catalyst was vulcanized with a cyclohexane solution containing 0.5% carbon disulfide, and the temperature was programmed to rise, and the vulcanization end point temperature was 360°C. Table 4 lists the sulfur and nitrogen content, density, aromatic compound content, tetrahydronaphthalene aromatic hydrocarbon content, and fraction distribution of raw materials and hydrotreated products. The sulfur and nitrogen contents of the hydrotreated product were 0.98 ppm and 0.60 ppm, respectively. According to the fraction distribution in Table 2, it ...
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Abstract
The invention relates to a method of using LCO for producing benzene and dimethylbenzene, and mainly solves the problem that in the traditional technology, the yield rate of aromatic hydrocarbon by material conversion is low. According to the technical scheme, the method comprises the steps of step a, adding LCO and hydrogen gas into a hydro-treating reactor in parallel, removing sulfur and nitrogen impurities, and converting polycyclic aromatic hydrocarbon to tetralin, indene and other monocyclic aromatic hydrocarbon, step b, conducting oil-gas separation and fractional distillation of a reactant effluent to acquire a light fraction, a middle fraction and a heavy fraction, wherein the heavy fraction is directly used as diesel oil product, step c, adding the middle fraction, circulating methylbenzene, circulating C9+ aromatic hydrocarbon and hydrogen gas into the reactor in parallel, and conveying the reactant to a fractionating system, step d, in the fractionating system, discharging the products before benzene to the outside, making the methylbenzene and C9+A fraction circulate back to a middle fraction conversion reactor, discharging the benzene and dimethylbenzene as products out of the system, and making a tower kettle heavy fraction circulate back to the hydro-treating reactor. The method can be used in the industrial production of benzene and dimethylbenzene by using LCO material.
Description
technical field [0001] The invention relates to a method for producing benzene and xylene by catalytic cracking light oil oil, in particular to a method capable of efficiently converting polycyclic aromatic hydrocarbons and single-ring aromatic hydrocarbons in catalytic cracking light oil oil into benzene and high-purity mixed xylene. Background technique [0002] Benzene and p-xylene (PX) are important basic organic chemical raw materials, which are widely used in the production of polyester, chemical fiber and other products. They are closely related to the development of the national economy and people's basic necessities of life. The demand has been strong and increasing rapidly in recent years. There are two main process routes for the source of aromatics raw materials: one raw material route is to obtain aromatics raw materials through catalytic reforming of naphtha and extraction of aromatics; Aromatics raw materials are extracted to convert low-value-added raw materi...
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IPC IPC(8): C07C6/12C07C5/27C07C15/04C07C15/08C10G67/02
CPCY02P20/52
Inventor 郑均林钱斌姜向东孔德金
Owner CHINA PETROLEUM & CHEM CORP