Integrated process method of producing low-carbon aromatic hydrocarbons and olefins from gas oil

A process method and technology of low-carbon aromatics, applied in the petroleum industry, hydroprocessing process, hydrocarbon oil treatment products, etc., can solve the problems of low yield of high value-added products, harsh process operating conditions, poor adaptability of raw materials, etc., to achieve The effect of strong raw material adaptability, low processing energy consumption, and mild operating conditions

Active Publication Date: 2020-03-31
CNOOC TIANJIN CHEM RES & DESIGN INST +2
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Problems solved by technology

[0009] The invention mainly solves the problems of low yield of high value-added products, harsh process operating conditions, high processing energy consumption, and poor adaptability of raw materials existing in the existing gas oil utilization technology, and can absorb and separate hydrocarbons, crack non-aromatics, and moderately hydrogenate heavy aromatics. The combination of cracking and other process units maximizes the conversion of non-aromatics in gas oil into low-carbon olefins, and maximizes the conversion of heavy aromatics into low-carbon aromatics

Method used

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  • Integrated process method of producing low-carbon aromatic hydrocarbons and olefins from gas oil

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Experimental program
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Effect test

Embodiment 1

[0030] The paraffin-based gas oil from a refinery was used as the raw material, and the properties of the raw material are shown in Table 1.

[0031] Gas oil hydrotreating unit: the catalyst uses Ni-Mo-P / Al 2 o 3 (Based on the catalyst, MoO 3 Content 10wt%, NiO content 4wt%, P2 o 5 Content 2.5wt%, the balance is alumina), reaction conditions: temperature 360 ​​℃, pressure 8.5MPa, volume space velocity 1.2h -1 , The volume ratio of hydrogen to oil is 600:1.

[0032] Hydrocarbon adsorption and separation unit: the adsorbent is Cu-modified MCM-48 molecular sieve (CuO content 4wt%), and the separation conditions are: adsorption temperature 120°C, pressure 1.5MPa, mass space velocity 0.5h -1 .

[0033] Non-aromatic hydrocarbon cracking unit: adopt moving bed catalytic cracking process, cracking catalyst is P modified molecular sieve catalyst (based on catalyst, P 2 o 5 content of 4wt%, Y-type molecular sieve content of 40wt%, ZSM-5 molecular sieve content of 25wt%, and the b...

Embodiment 2

[0039] Raw material is identical with embodiment 1. The conditions of the gas oil hydrofining unit, hydrocarbon adsorption separation unit, heavy aromatic mild hydrocracking unit, pyrolysis gasoline hydrofinishing unit, and aromatics extraction unit are the same as in Example 1, and the conditions of the non-aromatics cracking unit are as follows:

[0040] The steam cracking process is adopted, and the cracking conditions are: cracking furnace temperature 790°C, outlet pressure 0.2MPa, steam / oil mass ratio 0.75, residence time 0.18 seconds.

[0041] Through the above process, its material balance is shown in Table 2.

Embodiment 3

[0043] The intermediate base gas oil from a refinery is used as raw material, and the properties of the raw material are shown in Table 1.

[0044] Gas oil hydrotreating unit: the catalyst uses Co-Mo / Al 2 o 3 (Based on catalyst, CoO content 8wt%, MoO 3 Content 6wt%, the balance is alumina), reaction conditions: temperature 375 ℃, pressure 9.0MPa, volume space velocity 1.0h -1 , The volume ratio of hydrogen to oil is 700:1.

[0045] Hydrocarbon adsorption separation unit: The adsorbent is Mg-modified bentonite (MgO content 3wt%), and the separation conditions are: adsorption temperature 140°C, pressure 0.5MPa, mass space velocity 0.4h -1 .

[0046] Non-aromatic hydrocarbon cracking unit: fixed-bed catalytic cracking process is adopted, and the cracking catalyst is a molecular sieve catalyst modified by Mg (based on the catalyst, the MgO content is 2.5wt%, the β-type molecular sieve content is 45wt%, the ZSM-5 molecular sieve content is 20wt%, and the balance is alumina), t...

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Abstract

The invention provides an integrated process method of producing low-carbon aromatic hydrocarbons and olefins from gas oil. The method includes: feeding gas oil to a gas oil hydrogenation refining unit to perform a refining reaction to obtain refined gas oil; feeding the refined gas oil to a hydrocarbon adsorption separation unit to prepare a non-aromatic hydrocarbon component and a heavy aromatichydrocarbon component; feeding the non-aromatic hydrocarbon component to a non-aromatic hydrocarbon cracking unit to obtain olefin-rich gas, cracked gasoline and cracked heavy oil through catalytic cracking or vapor cracking; feeding the heavy aromatic hydrocarbon component and the cracked heavy oil into a heavy aromatic hydrocarbon mild-hydrogenation cracking unit to perform a selective crackingreaction, thus obtaining an extract raw material; feeding the cracked gasoline to a cracked gasoline hydrogenation refining unit to perform a refining reaction to obtain the extract raw material; feeding the extract raw material into an aromatic hydrocarbon extract unit to prepare the low-carbon aromatic hydrocarbons. In the invention, firstly, the hydrocarbons in the gas oil are separated, and secondly, a processing technology is selected specifically to maximumly produce the low-carbon aromatic hydrocarbons and olefins. The method has advantages of strong raw material adaptability, high target product yield and mild operation conditions.

Description

technical field [0001] The invention relates to the technical field of production of low-carbon aromatics and olefins, in particular to an integrated process method for producing low-carbon aromatics and olefins from gas oil. Background technique [0002] At present, the structure of my country's refining and chemical industry has undergone significant changes. First of all, on the supply side, the overall surplus of my country's oil refining capacity is prominent, and the operating rate of equipment is lower than the world average. On the demand side, the growth rate of my country's demand for refined oil has slowed down, diesel consumption has shown negative growth, and gasoline will reach its peak consumption by 2025. It has become a consensus in the industry to reduce the output of refined oil, increase the production of high value-added chemicals, and realize the transformation of enterprises from fuel-based to chemical-based. [0003] Low-carbon aromatics (benzene, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G67/00
CPCC10G67/00C10G2400/20C10G2400/30
Inventor 臧甲忠郭春垒范景新李犇赵训志马明超李健李滨辛利赵闯靳凤英
Owner CNOOC TIANJIN CHEM RES & DESIGN INST
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