Method for producing olefins and aromatic hydrocarbons with naphtha as raw material

A technology for naphtha and aromatic hydrocarbons, which is applied in chemical instruments and methods, petroleum industry, hydrocarbon cracking to produce hydrocarbons, etc., can solve the problem of decreased yields of propylene and butadiene, high benzene content in reformed gasoline, and ineffective naphthenic hydrocarbons. use, etc.

Active Publication Date: 2015-09-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0008] After the naphtha is extracted and separated by the above method, the raffinate oil mainly composed of alkanes and the extracted oil mainly composed of aromatic hydrocarbons and cycloalkanes are obtained, although the separated raffinate oil mainly composed of alkanes can be used as a raw material for steam cracking to increase ethylene Yield, but cycloalkane has not been effectively utilized, resulting in a decline in the yield of propylene and butadiene; most of the C 6 Naphthenes into the draw oil resulting in higher benzene content in reformated gasoline

Method used

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  • Method for producing olefins and aromatic hydrocarbons with naphtha as raw material
  • Method for producing olefins and aromatic hydrocarbons with naphtha as raw material
  • Method for producing olefins and aromatic hydrocarbons with naphtha as raw material

Examples

Experimental program
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Effect test

example 1

[0071] In this example, naphtha is hydrorefined.

[0072] In a 20 ml fixed bed continuous flow reactor, 20 ml of hydrofinishing catalyst A containing 0.03% by mass of CoO, 2.0% by mass of NiO, and 19.0% by mass of WO 3 , 0.7% by mass of F and 78.27% by mass of Al 2 o 3 .

[0073] The naphtha with the composition and properties listed in Table 1 was heated at 290°C, the hydrogen partial pressure was 1.6MPa, the hydrogen / hydrocarbon volume ratio was 200:1, and the feed volume space velocity was 8.0h -1 Under certain conditions, it is passed into the reactor filled with catalyst A for pre-hydrogenation and refining. The reaction product enters the water cooler and is separated into two phases of gas and liquid, which are measured separately and analyzed for composition. Table 2.

[0074] It can be seen from the results in Table 2 that after prehydrofining, the contents of olefins, sulfur, nitrogen, arsenic, and lead in naphtha all meet the feed requirements for catalytic refo...

example 2

[0080] According to the method of the present invention, liquid-liquid extraction is used to separate naphtha.

[0081] Carry out liquid-liquid extraction with sulfolane as a solvent, the naphtha listed in Table 2 is contacted with sulfolane in the extraction tower at a flow rate of 100 kg / hour, the solvent / raw material mass ratio is 5, and the pressure at the top of the extraction tower is 1.2MPa , the reflux ratio is 0.25, and the top temperature of the liquid-liquid extraction tower is 140°C. A rich solvent containing aromatics and naphthenes is obtained from the bottom of the extraction tower, and a raffinate containing alkanes and naphthenes is obtained from the top of the tower. The rich solvent is separated from sulfolane by distillation to obtain an extracted oil containing aromatics and naphthenes. The raffinate is washed with water to remove residual traces of solvent to obtain raffinate oil containing alkanes and cycloalkanes. See Table 3 for the production flow r...

example 3

[0083] Carry out liquid-liquid extraction with pentaethylene glycol as solvent, the naphtha listed in table 2 is contacted with pentaethylene glycol in the extraction tower with the flow rate of 100 kg / hour, solvent / raw material mass ratio is 7, extracts tower top The pressure is 0.8MPa, the reflux ratio is 0.2, and the temperature at the top of the liquid-liquid extraction tower is 150°C. A rich solvent containing aromatics and naphthenes is obtained from the bottom of the extraction tower, and a raffinate containing alkanes and naphthenes is obtained from the top of the tower. After the rich solvent is separated from the extraction solvent by distillation, the extracted oil containing aromatics and cycloalkanes is obtained, and the raffinate is washed with water to remove the residual trace solvent to obtain the raffinate oil. See Table 3 for the production flow rate, group composition and distribution ratio of various hydrocarbons in the extracted oil and raffinated oil.

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Abstract

A method for producing olefins and aromatic hydrocarbons with naphtha as a raw material comprises the steps: naphtha is subjected to liquid-liquid extraction, and an extract oil containing aromatic hydrocarbons and naphthenes and a raffinate oil containing alkanes and naphthenes are obtained, wherein the mass ratio of the naphthenes contained in the raffinate oil and the naphthenes contained in naphtha is 10-55%; the obtained raffinate oil is sent into a steam cracking zone and is subjected to a cracking reaction, obtained cracked gasline is hydrofined, and hydrofined cracked gasoline is obtained; the extract oil containing the aromatic hydrocarbons and the naphthenes is sent to a catalytic reforming zone and is subjected to a catalytic reforming reaction, and a reformed generated oil, a C3-C5 fraction and gas are obtained; and the obtained hydrofined cracked gasoline returns to the catalytic reforming zone to be used as a catalytic reforming raw material, or is mixed with naphtha and is subjected to liquid-liquid extraction, and the C3-C5 fraction obtained in the reforming reaction returns to the steam cracking zone and is subjected to a cracking reaction. The method can effectively utilize naphtha to produce more light-olefin aromatic hydrocarbons.

Description

technical field [0001] The invention relates to a method for producing olefins and aromatics using naphtha as a raw material, specifically, a method for producing light olefins and aromatics using naphtha as a raw material through catalytic reforming and steam cracking. Background technique [0002] Catalytic reforming and steam cracking are mature industrial technologies in the petrochemical field. The main purpose of catalytic reforming is to produce aromatics, high-octane gasoline and hydrogen. During catalytic reforming, several competing reactions can occur simultaneously, these reactions include dehydrogenation of cyclohexane to aromatics, dehydroisomerization of alkylcyclopentanes to aromatics, dehydrocyclization of paraffins to aromatics, hydrogenation of paraffins Cracking conversion to light hydrocarbon products outside the gasoline boiling range, dealkylation of alkylbenzenes and isomerization of paraffins. In order to obtain high-octane gasoline blending compone...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G67/00C07C4/04C07C5/367C07C5/387C07C5/41C07C11/02C07C11/04C07C11/06C07C11/167C07C15/02C07C15/04C07C15/06C07C15/08
Inventor 马爱增田龙胜龙军王杰广唐文成
Owner CHINA PETROLEUM & CHEM CORP
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