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Method for producing olefin and low-benzene-content gasoline component from naphtha

A naphtha and naphtha content technology, applied in the petroleum industry, hydrocarbon oil treatment, hydrocarbon cracking and hydrocarbon production, etc., can solve the problem of decreased yield of propylene and butadiene, high benzene content in reformed gasoline, and ineffective use of naphthenes and other problems to achieve the effect of increasing yield and reducing benzene content

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 olefin and low-benzene-content gasoline component from naphtha
  • Method for producing olefin and low-benzene-content gasoline component from naphtha
  • Method for producing olefin and low-benzene-content gasoline component from naphtha

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0076] In this example, naphtha is pre-hydrotreated.

[0077] In a 20 ml fixed-bed continuous flow reactor, fill 20 ml of pre-hydrofining catalyst A (brand RS-1, produced by Sinopec Catalyst Changling Branch), which contains 0.03% by mass of CoO, 2.0% by mass % NiO, 19.0 mass% WO 3 , 0.7% by mass of F and 78.27% by mass of Al 2 o 3 .

[0078] 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 the condition of passing through the above-mentioned reactor filled with catalyst A for pre-hydrofining, 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. The naphtha obtained after pre-hydrofining The composition and properties are shown in Table 2.

[0079] Table 1

[0080]

[0081] Table 2

[0...

example 2

[0085] Distilled naphtha is extracted according to the method of the present invention.

[0086] Using sulfolane as a solvent for extractive distillation, the naphtha after pre-hydrogenation listed in Table 2 is contacted with sulfolane in an extractive distillation tower at a flow rate of 100kg / h, the mass ratio of solvent / raw material is 6.0, and the extractive distillation tower The top pressure is 0.145MPa (absolute pressure), the reflux ratio is 0.25, the temperature at the top of the extractive distillation tower is 80°C, and the temperature at the bottom of the tower is 160°C. A solvent rich in aromatics and naphthenes is obtained from the bottom of the extractive distillation tower, and a solvent containing alkanes and C is obtained from the top of the tower. 6 Naphthenic raffinate, rich in aromatics and low in C 6 The solvent containing naphthenes is separated from the extraction solvent by distillation to obtain the extracted oil. The yield of extracted oil and raf...

example 3

[0088]Adopting N-formylmorpholine as the extractive distillation solvent, the naphtha listed in Table 2 is contacted with N-formylmorpholine in the extractive distillation tower with a flow rate of 100kg / h, the solvent / raw material mass ratio is 7.0, and the extractive distillation The pressure at the top of the tower is 0.145MPa (absolute pressure), the reflux ratio is 0.25, the temperature at the top of the extractive distillation tower is 76°C, and the temperature at the bottom of the tower is 170°C. A solvent rich in aromatics and naphthenes is obtained from the bottom of the extractive distillation tower, and a solvent containing alkanes and C is obtained from the top of the tower. 6 Naphthenic raffinate. Rich in aromatics and low in C 6 The solvent containing naphthenes is separated from the extraction solvent by distillation to obtain the extracted oil. The yield of extracted oil and raffinate (relative to naphtha), group composition and distribution ratio of various ...

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Abstract

A method for producing olefin and a low-benzene-content gasoline component from naphtha comprises the steps: naphtha is subjected to extractive distillation, an extract oil containing aromatic hydrocarbon and C6 naphthene and a raffinate oil containing alkane and C6 naphthene are obtained, wherein the mass ratio of the C6 naphthene in the raffinate oil and the C6 naphthene in naphtha is 70-96%; and the obtained raffinate oil is sent into a steam cracking device and is subjected to a cracking reaction, a cracking reaction product is separated, cracked gasoline obtained from the separation is hydrofined, hydrofined cracked gasoline is obtained, the obtained extract oil is subjected to a catalytic reforming reaction, a reforming reaction product is separated, gas, a C3-C4 fraction and a low-benzene-content reformed generated oil are obtained, the C3-C4 fraction in the reformed products is sent into the steam cracking device, and the obtained hydrofined cracked gasoline returns to be mixed with naphtha and then is subjected to extractive distillation. The method improves the utilization rate of naphtha, and can produce the low-benzene-content gasoline component while producing more ethylene, propylene and butadiene.

Description

technical field [0001] The invention is a combined process, specifically, a method for producing light olefins and low-benzene gasoline components by reforming and cracking reactions using naphtha as a raw material. 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 components or aromatics, it is not only desirable to dehydrocy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G69/00C07C4/06C07C11/04C07C11/06C07C11/167
Inventor 马爱增田龙胜王杰广唐文成
Owner CHINA PETROLEUM & CHEM CORP
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