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Method for producing benzene arenes from coarse benzene

A technology for benzene-based aromatics and crude benzene, applied in the field of aromatics, can solve problems such as easy polymerization, coking, difficult long-term operation, and instability of crude benzene, and achieve the effects of low impurity content, strong adaptability, and long continuous operation cycle

Active Publication Date: 2008-12-24
HUNAN CHANGLING PETROCHEM SCI & TECH DEV CO LTD
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  • Summary
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, the three crude benzene hydrogenation processes all require pre-fractionation of crude benzene raw materials. Because crude benzene is extremely unstable, it is easy to polymerize and coke when heated, and it is difficult to operate in a long period.

Method used

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  • Method for producing benzene arenes from coarse benzene
  • Method for producing benzene arenes from coarse benzene
  • Method for producing benzene arenes from coarse benzene

Examples

Experimental program
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Embodiment 1

[0025] Raw material 1 is a mixture of crude benzene and conventional third-line oil in a weight ratio of 1:9, and its properties are shown in Table 1. The raw material 1 is mixed with hydrogen and enters the hydrogenation test device. The reaction conditions are shown in Table 2. The catalyst is a molybdenum-cobalt-phosphorus hydrogenation catalyst. The gas-liquid mixture discharged from the hydrogenation reactor enters the gas-liquid separator. The liquid phase is sent to the stripping product tank, and the liquid product is collected after stripping, and the liquid product enters the fractionation tower. The common third-line oil separated at the bottom of the fractionating tower is pumped into the crude benzene raw material inlet for recycling. The distillate oil separated from the top of the fractionating tower is called hydrogenated oil. The properties and group composition of the hydrogenated oil are shown in Table 2. . The oil produced by hydrogenation is pre-distilled...

Embodiment 2

[0027] Raw material 2 is a mixture of crude benzene and conventional third-line oil in a weight ratio of 2:1, and its properties are shown in Table 1. See Table 2 for hydrogenation reaction conditions, properties and family composition of hydrogenated oil. Other reaction conditions, reaction steps are with embodiment 1. The product properties are shown in Table 3.

Embodiment 3

[0029] Raw material 3 is a mixture of crude benzene and conventional third-line oil at a weight ratio of 9:1, and its properties are shown in Table 1. See Table 2 for hydrogenation reaction conditions, properties and family composition of hydrogenated oil. Other reaction conditions, reaction steps are with embodiment 1. The product properties are shown in Table 3.

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Abstract

A process for preparing benzene-series arylhydrocarbon from crude benzene includes such steps as proportionally adding common triplet oil, hydrorefining, fractionating, extracting in solvent, distilling and rectifying to obtain high-purity (more than 99.9%) benzene, toluene and xylene.

Description

1. Technical field [0001] The invention belongs to the field of chemical industry, and relates to the deep processing and utilization of by-products (crude benzene) produced by iron and steel enterprises and coking enterprises, in particular to a method for obtaining petroleum-grade benzene, toluene, xylene and other aromatic hydrocarbons by using whole distillate crude benzene as raw material method. 2. Background technology [0002] Benzene, toluene, and xylene are all important organic chemical basic raw materials, and they mainly come from petroleum processing. Crude benzene is a light distillate oil recovered from coal coking crude gas, and its main component is single-ring aromatic hydrocarbons. The content of benzene, toluene and xylene in crude benzene accounts for more than 90%, of which benzene accounts for about 70%, toluene 8%-25%, and xylene 2%-5%. Benzene, toluene, and xylene obtained from crude benzene can be used to make up for the shortage of benzene-based...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C7/04C07C7/08C07C15/02C10G45/02
Inventor 佘喜春朱方明李庆华郭朝辉
Owner HUNAN CHANGLING PETROCHEM SCI & TECH DEV CO LTD
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