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Production of ethylbenzene by ethane and benzene phase-variable catalytic separation in catalytic dry gas

A catalytic cracking and dry gas technology, applied in chemical instruments and methods, organic chemistry, hydrocarbons, etc., can solve problems such as pollution, waste of resources and the environment

Inactive Publication Date: 2007-04-04
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Catalytic cracking dry gas is the by-product tail gas of the refinery, which contains 12-25% (volume fraction) of ethylene, which is mainly burned as gas or torched, resulting in waste of resources and environmental pollution

Method used

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  • Production of ethylbenzene by ethane and benzene phase-variable catalytic separation in catalytic dry gas
  • Production of ethylbenzene by ethane and benzene phase-variable catalytic separation in catalytic dry gas

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Experimental program
Comparison scheme
Effect test

Embodiment 1-6

[0030]The catalyst used in the reaction is 3994 (Y-type molecular sieve) special-shaped catalyst produced by Fushun Catalyst Factory. The reaction conditions and results are shown in Table 1. It can be seen from the table that within the range of conditions investigated, the conversion rate of ethylene is above 95%, the selectivity of ethylbenzene is >99%, and the content of xylene is less than 25ppm.

Embodiment 7

[0034] The process flow chart of the combination of catalytic dry gas, benzene phase-changing catalytic reaction and fractionation system of the present invention is shown in Figure 2. When the raw material gas contains less propylene, the propylene benzene separation tower may not be installed. According to the experimental results of the small test, the combined process can obtain the following results through simulation calculation: the conversion rate of ethylene is >95%, the selectivity of ethylene to ethylbenzene is >99%, the purity of ethylbenzene product is >99.8%, and the content of xylene in ethylbenzene is < 100ppm.

[0035] Reaction conditions

Reaction product distribution (%)

vinyl turn

Conversion rate (%)

Ethylbenzene True Selection

Selectivity (%)

Ethylbenzene list selection

Selectivity (%)

temperature

(℃)

pressure

(MPa)

Vinyl weight

Airspeed (h-1)

B...

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Abstract

Production of phenylethane by catalytic cracking ethane in dry gas and catalytic separating benzene is carried out by entering benzene and catalytic dry gas into top and bottom of reaction tower, reaching reactive section temperature to boiling temperature, absorbing heat produced from ethane and benzene reaction in dry gas by heat generated by liquefied benzene vaporization, filling cold raw material into middle and bottom of reactive section, decreasing reactive temperature, heating raw material benzene and charge gas by effluent, and adding into polyethylated benzene in proportion of polyethylated benzene: by-products of ethane and benzene alkylation=1.5:1. The raw material benzene is selected from industrial pure benzene and charge gas is selected from catalytic dry gas.

Description

technical field [0001] The invention relates to a method for preparing ethylbenzene by catalytically separating ethylene and benzene in catalytic cracking and catalytic cracking dry gas (collectively referred to as catalytic dry gas). Background technique [0002] Alkyl aromatics are widely used intermediate products, the most important of which are ethylbenzene and cumene. Ethylbenzene is the key raw material for the production of styrene, and styrene is an important monomer for the synthesis of polymer materials, mainly used for the production of Taking polystyrene and copolymer ABS resin, AS resin, styrene-butadiene rubber, and unsaturated polyester, etc., in the past ten years, the production capacity of ethylbenzene in the world has more than doubled, with a total output of 20 million tons per year. In recent years, my country's demand for this kind of plastic has also increased day by day. In 2000 alone, my country's demand for styrene reached 1.2 million tons per year. ...

Claims

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Application Information

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IPC IPC(8): C07C15/073C07C2/64
Inventor 徐龙伢王清遐陈福存谢素娟刘盛林
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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