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Preparation method of low carbon olefin

A low-carbon olefin and carbon dioxide technology, which is applied in the fields of hydrocarbon cracking, organic chemistry, and bulk chemical production. The effect of reduced emissions and flexible process control

Active Publication Date: 2019-04-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing low-carbon olefins in order to overcome the problems of severe coking in the reaction tubes in the prior art, blockage in a short time, and a large amount of heavy oil that cannot be fully utilized. Heavy oil is prepared, and the heavy oil can be fully utilized by the method of the present invention, which can alleviate the problem of petrochemical raw material tension

Method used

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preparation example Construction

[0023] The invention provides a kind of preparation method of light olefin, wherein, the method comprises the following steps:

[0024] (1) Contacting and separating heavy oil and supercritical carbon dioxide to obtain a light fluid phase containing light oil and carbon dioxide, and a heavy fluid phase containing heavy oil;

[0025] (2) performing component separation on the light fluid phase containing light oil and carbon dioxide to obtain light oil and carbon dioxide;

[0026] (3) Subjecting the light oil to steam thermal cracking to obtain light olefins.

[0027] In the present invention, according to the difference in temperature and pressure, the substance presents state changes such as liquid, gas, and solid. If the temperature and pressure are raised above a certain point, the interface between the liquid and the gas will disappear. This point is called the critical point. point, supercritical fluid (SCF) refers to a fluid in the temperature and pressure region above ...

Embodiment 1

[0044] Set the density to 862.4kg / m 3 , the carbon residue value is 3.41%, the colloid is 9.1%, and the crude oil (heavy oil) with 0.1% asphaltene is pressurized to 20MPa, preheated to 60 ℃ and sprayed into the extraction tower from the top. The supercritical carbon dioxide is pressurized to 20MPa, preheated to 50°C, and enters the extraction tower from the lower part. The mixing weight ratio of crude oil and supercritical carbon dioxide entering the extraction tower is 1:2, and the rich heavy oil is obtained at the bottom of the extraction tower. The heavy fluid phase of the heavy fluid phase, the light fluid phase rich in light oil and carbon dioxide produced at the top of the extraction tower reduces the pressure to 1 MPa and the temperature is 60 ° C, and then enters the recovery tower, and the light oil in the light fluid phase is separated from carbon dioxide; separation The carbon dioxide obtained from the top of the tower is pressurized and heated, and then circulated ...

Embodiment 2

[0047] Set the density to 862.4kg / m 3 , with a residual carbon value of 3.41%, a colloid content of 9.1%, and an asphaltenes content of 0.1%, the crude oil is pressurized to 15MPa, preheated to 50°C and sprayed into the extraction tower from the top. The supercritical carbon dioxide is pressurized to 15MPa, preheated to 40°C, and enters the extraction tower from the lower part. The mixing weight ratio of crude oil and supercritical carbon dioxide entering the extraction tower is 1:4, and the bottom of the extraction tower is rich in heavy oil. The heavy fluid phase of the heavy fluid phase, the light fluid phase rich in light oil and carbon dioxide produced at the top of the extraction tower reduces the pressure to 0.1MPa and the temperature is 40 ° C, and then enters the recovery tower, and the light oil in the light fluid phase is separated from carbon dioxide; The carbon dioxide obtained from the top of the separation tower is pressurized and heated, and then circulated bac...

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Abstract

The invention relates to the field of petrochemical production and discloses a preparation method of low carbon olefin. The method comprises the following steps of: (1) heavy oil is contacted with andseparated from supercritical carbon dioxide to obtain a light fluid phase containing light oil and carbon dioxide, and a heavy fluid phase containing heavy oil; (2) the light fluid phase containing the light oil and carbon dioxide undergoes component separation to obtain light oil and carbon dioxide; and (3) the light oil is subjected to steam thermal cracking to obtain low carbon olefin. Throughthe above method, the heavy oil can be fully utilized, the problem of the shortage of the petrochemical raw material can be alleviated, and a cracking device can be operated for a long time. Moreover, in the preparation method of the invention, carbon dioxide is used, which not only avoids the greenhouse effect caused by the emission of carbon dioxide into the atmosphere but also recycles the carbon dioxide to achieve the effect of synergistic emission reduction.

Description

technical field [0001] The invention relates to the field of petrochemical production, in particular to a method for preparing low-carbon olefins. Background technique [0002] At present, the steam pyrolysis process is mainly used in the world to produce ethylene, propylene, butadiene and other low-carbon olefins. Raw materials such as light hydrocarbons, naphtha, and hydrogenated tail oil are mixed with a certain proportion of diluted steam in an industrial cracking furnace to undergo cracking reactions under high temperature conditions. Low carbon olefins such as dienes. [0003] Heavy oil has high viscosity, high boiling point, high colloid and asphaltene content. The main problem of steam thermal cracking directly using heavy oil as raw material is that it is difficult to completely gasify heavy oil in the convection section, and the coking in the reaction tube is serious. Time will be blocked. At the same time, the yield of light olefins obtained by steam thermal cr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C4/04C07C11/04C07C11/06C07C11/167
CPCC07C4/04C07C11/04C07C11/06C07C11/167Y02P20/54
Inventor 刘同举王国清杜志国李蔚张永刚张利军薛丽敏
Owner CHINA PETROLEUM & CHEM CORP
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