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Method for preparing ethylbenzene by reaction of dilute ethylene and benzene
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A technology of diluting ethylene and ethylene, which is applied in the field of ethylbenzene production in petrochemical industry, can solve problems such as the increase of xylene content, and achieve the effect of reducing temperature rise
Active Publication Date: 2010-07-07
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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However, these technologies can only be used for the conversion of dilute ethylene in dry gas with low propylene content. When the concentration of propylene in the feed gas is high, the content of xylene increases
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Embodiment 1
[0082] Embodiment 1: Production example of 80,000 tons / year ethylbenzene plant
[0083] figure 1 , 2 The meanings of the equipment reference signs in the middle are as follows: dry gas liquid separation tank 1, water washingtower 2, liquid separation tank 3, propylene absorption tower 4, deethylene tower 5, depropylene tower 6, reflux tank 7, alkylation reactor 8, circulation Benzeneheating furnace 9, circulating benzene buffer tank 10, anti-alkylation material tank 11, anti-alkylation reactor 12, rough fractionation tower 13, rough fractionation tower reflux tank 14, absorption tower 15, benzene tower 16, benzene tower reflux tank 17 , Ethylbenzene tower 18, ethylbenzene tower reflux tank 19, propylbenzene tower 20, benzene tower reflux tank 21, multiple ethylbenzene tower 22, ethylbenzene tower reflux tank 23.
[0084] ① Raw materials and reaction conditions: the main composition of dry gas is as follows (volume %): C 2 h 4 18.5, C 3 h 6 1.5, COx 3.6, O 2 0.4,H ...
Embodiment 2
[0096] Embodiment 2: Example of 80,000 tons / year ethylbenzene plant
[0097] image 3 , 4 The meanings of reference signs in the middle are as follows: washing tank 1, liquid separation tank 2 / 6, propylene absorption tower 3, depropylene tower 4, reflux irrigation of each tower 5 / 15 / 17 / 19 / 21 / 23, circulating benzene tank 7, fresh Benzene tank 8, alkylation reactor 9, circulating benzene heating furnace 10, anti-alkylation reactor 11, tail gas absorption tower 13, benzene tower 14, non-aromatic tower 16, ethylbenzene tower 18, propylbenzene tower 20, polyethylen Benzene tower 22.
[0099] The dry gas composition is as follows (volume%): CH 4 30.5, C 2 h 4 25.5, C 2 h 6 15.6, C 3 h 6 4.3、C 3 h 8 2.5, H 2 8.4, N 2 7.5, CO 1.1, CO 2 4.0, O 2 0.6, H 2 S, 160mg / m 3 、H 2 O 1500ppm.
[0100] The alkylation catalyst adopts industrially produced DL0802 catalyst, the alkylation reaction conditions: reaction inlet...
Embodiment 3
[0127] The content of this embodiment is basically the same as that of Embodiment 1, and its difference mainly lies in:
[0128] The specific conditions of the alkylation reaction are: reaction temperature 280°C, reaction pressure 3.0MPa, molar ratio of benzene to ethylene is 2, and weight space velocity of ethylene is 2.5h -1 .
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Abstract
The invention discloses a method for preparing ethylbenzene by reaction of dilute ethylene and benzene, which uses the dilute ethylene in dry gas of oil refinery as raw material, water washing and selective removal of propylene are conducted for the dry gas before the dry gas enters an alkylation reactor in sections, alkylation reaction of the dilute ethylene in dry gas and the benzene proceeds under the circumstances that zeolite catalyst exists, the dry gas and / or low-temperature gas-phase benzene are utilized for taking heat during the alkylation reaction, and the reaction temperature rising is reduced; after the vapor-liquid separation of the alkylation reaction product, tail gas is discharged from the device through low-temperature absorption, and cycle benzene, ethylbenzene, propyl benzene, diethylbenzene and heavy component are sequentially separated from the liquid product through a separation system; the diethylbenzene and the benzene are mixed and enter an anti-alkylation reactor and anti-alkylation reaction proceeds on molecular sieve catalyst for further converting to the ethylbenzene. The invention effectively reduces the benzene consumption and the energy consumption during the course of preparing ethylbenzene by dilute ethylene, the ethylene conversion rate is more than or equal to 99%, the total selectivity of generating ethylbenzene is more than or equal to 99%, the recovery rate of benzene carried by the tail gas is more than or equal to 99.5%, and the xylene content in the ethylbenzene is less than 800 ppm.
Description
technical field [0001] The invention relates to the technical field of ethylbenzene production in petrochemical industry, and more specifically relates to a process for preparing ethylbenzene by using dilute ethylene and benzene in refinery dry gas as raw materials in the presence of a zeolite catalyst. Background technique [0002] Ethylbenzene is an important raw material for the production of styrene, and then polystyrene and copolymer resin. With the development of its downstream industries such as automobiles, home appliances, building materials, and packaging, the demand for ethylbenzene and styrene continues to grow at home and abroad , but most of ethylbenzene is produced by reacting benzene with high concentration ethylene as raw material. [0003] With the development of the petroleumprocessing industry, a large amount of refinerytail gas containing low-concentration ethylene provides a new source of raw materials for the production of ethylbenzene. Making full u...
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IPC IPC(8): C07C15/073C07C2/66
CPCY02P20/52
Inventor 徐龙伢陈福存王清遐朱向学刘盛林谢素娟李淑红曾蓬张银龙张仲利
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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