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 the problems of difficult long-term operation, unstable crude benzene, easy polymerization, coking, etc., and achieve the effects of strong adaptability, long continuous operation period and low impurity content

Active Publication Date: 2007-09-05
HUNAN CHANGLING PETROCHEM SCI & TECH DEV CO LTD
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  • Abstract
  • 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

Examples

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Comparison scheme
Effect test

Embodiment 1

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

Embodiment 2

[0027] Raw material 2 is a mixture of crude benzene and normal third-line oil in a weight ratio of 2:1. The properties are shown in Table 1. The hydrogenation reaction conditions, the properties and group composition of the hydrogenated oil are shown in Table 2. Other reaction conditions and reaction steps are the same as in Example 1. Product properties are shown in Table 3.

Embodiment 3

[0029] Raw material 3 is a mixture of crude benzene and normal third-line oil in a weight ratio of 9:1. The properties are shown in Table 1. The hydrogenation reaction conditions, the properties and group composition of the hydrogenated oil are shown in Table 2. Other reaction conditions and reaction steps are the same as in Example 1. 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, and particularly relates to a method for obtaining petroleum-grade benzene, toluene, xylene and other aromatic hydrocarbons by using crude benzene as a 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 kind of light distillate oil recovered from the crude gas of coal coking, and its main component is monocyclic 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 deficiencies in the ...

Claims

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Application Information

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Patent Type & Authority Applications(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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