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Method for preparing aromatic hydrocarbon by coal tar oil

A technology of coal tar and aromatics, applied in the field of producing aromatics from coal tar, to achieve high yield and alleviate the effect of insufficient supply

Inactive Publication Date: 2013-12-11
SHAANXI COAL & CHEM TECH INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the defects of the prior art, provide a method for producing aromatics from coal tar, make full use of coal tar and naphtha fractions in the production process, provide new reforming raw materials, and slow down the current reforming raw material petroleum Insufficient supply of base naphtha

Method used

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  • Method for preparing aromatic hydrocarbon by coal tar oil

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Experimental program
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Effect test

Embodiment 1

[0037]The medium and low temperature coal tar is sent to the pretreatment unit to remove mechanical impurities and water, and then enters the atmospheric and vacuum fractionation tower to obtain the straight-run naphtha fraction. The naphtha fraction is pre-fractionated, and the 60-145°C fraction is selected. See Table 1; the remaining fractions are coked, cracked or hydrotreated to obtain naphtha fractions, and the naphtha fractions are pre-fractionated to obtain raw material components for the production of aromatics. Then pre-hydrogenate the selected straight-run naphtha fraction and raw material components, reform the pre-hydrogenated product that meets the reforming raw material conditions, and then separate the reformed product aromatics mixture through aromatics extraction to obtain benzene , toluene, C 8 and C 8+ The components are further isomerized to produce benzene or benzene and p-xylene.

Embodiment 2

[0039] The medium and low temperature coal tar is sent to the pretreatment unit to remove mechanical impurities and water, then enters delayed coking, and then undergoes hydrotreating, and the treated oil enters atmospheric and vacuum fractionation to obtain coking naphtha fractions. The fractions were pre-fractionated, and the fractions at 60-145°C were selected. The properties are shown in Table 1. Then pre-hydrogenation is carried out, and the pre-hydrogenation product that meets the conditions of the reforming raw material is reformed, and then the aromatic hydrocarbon mixture of the reformed product is separated through aromatic hydrocarbon extraction to obtain benzene, toluene, C 8 and C 8+ The components are further isomerized to produce benzene or benzene and p-xylene.

Embodiment 3

[0041] The medium and low temperature coal tar is sent to the pretreatment unit to remove mechanical impurities and water, then enters the hydrogenation unit, and then enters the atmospheric and vacuum distillation unit to obtain the hydrocracked naphtha fraction, which is pre-fractionated, and 60 ~145°C distillate section, the properties are shown in Table 1. Then pre-hydrogenation is carried out, and the pre-hydrogenation product that meets the conditions of the reforming raw material is reformed, and then the aromatic hydrocarbon mixture of the reformed product is separated through aromatic hydrocarbon extraction to obtain benzene, toluene, C 8 and C 8+ The components are further isomerized to produce benzene or benzene and p-xylene.

[0042] Attached Table 1: 60~145℃ Distillate Section Naphtha Properties

[0043]

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Abstract

The invention discloses a method for preparing aromatic hydrocarbon by coal tar oil. The method comprises the following steps: carrying out atmospheric and vacuum distillation after pre-treating the coal tar oil to obtain a straight-run naphtha fraction; coking, cracking or hydrotreating the rest of fractions to obtain the naphtha fraction, or pre-treating the coal tar oil, coking, and then, cracking or hydrotreating, and then carrying out atmospheric and vacuum distillation to obtain the naphtha fraction; pre-fractioning and chopping the naphtha fraction and the straight-run naphtha fraction to produce raw material components for producing the aromatic hydrocarbon; desulfurating and denitriding through the pre-hydrotreating to obtain a reforming raw material; reforming to obtain a lightweight aromatic hydrocarbon mixture; separating the lightweight aromatic hydrocarbon mixture to obtain benzene and toluene; and further carrying out isomerization onto the C8 and C8+ components of the aromatic hydrocarbon to obtain the benzene or benzene and paraxylene. According to the method for preparing aromatic hydrocarbon by coal tar oil disclosed by the invention, the coal-based naphtha is sufficiently utilized, the whole process is higher in aromatic hydrocarbon yield, a novel reforming raw material is provided, and a problem that the existing reforming material petrol-based naphtha is insufficient in supply is relieved.

Description

technical field [0001] The invention relates to coal tar processing technology, in particular to a method for preparing aromatics from coal tar. Background technique [0002] Catalytic reforming is an important way to produce aromatics. About 90% of aromatics come from aromatics complexes. Catalytic reforming is the core of the whole unit. Generally, the raw material for reforming is petroleum-based naphtha. In addition, the by-product hydrogen of reforming is also an important source of hydrogen for various hydrogenation processes, which require vigorous development of reforming processes. In recent years, due to the obvious trend of heavy and inferior crude oil being exploited, the supply of naphtha used to produce aromatics is tight, while the world's demand for aromatics continues to grow. With insufficient supply of reformate and growing demand for reformate, other means must be developed to obtain reformate. [0003] The earliest method of producing aromatics from co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G67/00C07C15/04C07C15/06C07C15/08C07C5/00C07C6/12
CPCY02P20/52
Inventor 乔婧郑化安孙显锋拓婷婷张晶付刚张生军闵小建
Owner SHAANXI COAL & CHEM TECH INST
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