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Method for producing ethyl benzene through alkylation in gas phase

A gas-phase alkylation and alkylation technology, which is applied in chemical instruments and methods, organic chemistry, hydrocarbons, etc., can solve the problems of uneven gas flow distribution of reactants and insufficient utilization of catalysts, etc.

Active Publication Date: 2008-03-19
CHINA PETROLEUM & CHEM CORP +1
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  • Description
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Problems solved by technology

[0008] The technical problem to be solved by the present invention is that the reactant gas flow distribution in the alkylation reactor used in the gas-phase alkylation technology used in the past is uneven, resulting in the problem that the catalyst cannot be fully utilized. A new gas-phase A method for producing ethylbenzene by alkylation, which has the advantages of small pressure drop in the gas predistributor, uniform gas flow distribution in the catalyst bed, and high catalyst utilization

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  • Method for producing ethyl benzene through alkylation in gas phase
  • Method for producing ethyl benzene through alkylation in gas phase
  • Method for producing ethyl benzene through alkylation in gas phase

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Embodiment 1

[0023] The 15,000 tons / year ethylbenzene unit in a factory adopts molecular sieve gas-phase alkylation process. The alkylation reactor is a 4-stage layered adiabatic fixed-bed reactor. The inner diameter of the reactor is φ600, and the inner diameter of the inlet pipe is d in =200 mm, adopt conical single-stage baffle type inlet gas pre-distributor as shown in Figure 3, its cylinder inner diameter d i =170 mm, cone angle α=150°, ring gap height H=50 mm. The height of the homogenization space inside the reactor is 1150 mm, and the catalyst bed heights from top to bottom are 310, 345, 380, 430, 480, and 890 mm, and the upper and lower ceramic ball layers are made of inert alumina ceramic balls. The thickness is 180mm. There are 3 inter-stage calandria gas distributors, the diameter of the main pipe is φ50, 6 branch pipes, the diameter is φ20, and the number of openings is 32. The opening diameters of the 3 calandria gas distributors are 4, 4.5, 5 mm, the angle between the hole...

Embodiment 2

[0027] The 30,000 tons / year ethylbenzene unit of a factory adopts molecular sieve gas-phase alkylation process. The alkylation reactor is a 6-stage layered adiabatic fixed-bed reactor with an inner diameter of φ700 and an inner diameter of the inlet pipe d in =250 mm, adopt conical single-stage baffle type inlet gas pre-distributor as shown in Figure 3, its cylinder inner diameter d i =200 mm, cone angle α=120°, ring gap height H=50 mm. The height of the homogenization space inside the reactor is 1650 mm, and the height of the catalyst bed is 360, 395, 440, 490, 550, and 1030 mm from top to bottom. The upper and lower ceramic ball layers are made of inert alumina ceramic balls. The thickness is 150mm. There are 5 pipe-type gas distributors between sections, the diameter of the main pipe is φ70, 6 branch pipes, the diameter is φ40, and the number of openings is 50. The opening diameters of the 5 pipe-type gas distributors are 3.5, 4, 4, 4.5, 5 mm, the angle between holes is 6...

Embodiment 3

[0031] The 160,000 tons / year ethylbenzene unit of a factory adopts molecular sieve gas-phase alkylation process. The alkylation reactor is a 6-stage layered adiabatic fixed-bed reactor with an inner diameter of φ1600 and an inner diameter of the inlet pipe d in =500 mm, adopt the conical single-stage baffle type inlet gas pre-distributor as shown in Figure 3, and its cylinder inner diameter d i =470mm, cone angle α=150°, ring gap height H=120mm. The height of the homogenization space inside the reactor is 2250mm, and the height of the catalyst bed is 280, 310, 350, 395, 440, 815mm from top to bottom. The upper and lower ceramic ball layers are made of inert alumina ceramic balls. The thicknesses are 210 and 170 mm respectively. There are 5 inter-stage calandria gas distributors, the diameter of the main pipe is φ150, 12 branch pipes, the diameter is φ50, and the number of openings is 196. The opening diameters of the 5 calandria gas distributors are 4, 4.5, 5, 5.5, 6 mm, the...

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Abstract

This invention relates to a method for manufacturing ethylbenzene by vapor-phase alkylation of ethylene and benzene in the presence of ZSM-5 molecular sieve catalyst. The reactor is a multi-stage fixed bed reactor, on top of which is a gas pre-distributor comprising a cone-shaped single stage baffler. Between neighboring catalyst beds is a porous discharging pipe gas distributor. The method solves the problems ununiformity of reactive gas flow distribution in the reactor, as well as the incomplete utilization of the catalyst. The method can be used in ethylbenzene industrial manufacture.

Description

technical field [0001] The invention relates to a method for producing ethylbenzene by gas-phase alkylation, especially using benzene and ethylene as raw materials, using a multi-stage layered adiabatic fixed-bed reactor with a conical single-stage baffle gas pre-distributor for gas-phase alkylation of ethylbenzene The method of producing ethylbenzene. Background technique [0002] Ethylbenzene is an important chemical raw material and an indispensable key raw material for the production of styrene. Most ethylbenzene manufacturers produce ethylbenzene for the production of styrene in their own styrene plants, and more than 99% of ethylbenzene is used for Styrene is produced. Styrene is an important basic organic chemical raw material. It is mainly used in the field of polymer materials to prepare polystyrene and its copolymers, such as ABS, AS, styrene-butadiene rubber and its unsaturated polyester. In addition, styrene is used as an organic reaction intermediate Body is a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C15/073C07C2/66
Inventor 刘文杰邵百祥崔世纯
Owner CHINA PETROLEUM & CHEM CORP
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