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Device and method for preparing ethylbenzene by catalytic conversion of alcohol ether

A catalytic conversion, alcohol ether technology, applied in the chemical industry, to achieve the effect of easy re-aromatization, easy separation, and reduced settings

Active Publication Date: 2011-07-27
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the catalysts for the main production of ethylene and aromatics from methanol are different, and these two processes involve catalyst regeneration and product separation, so there is still no technology that can simultaneously produce equimolar or equivalent amounts of ethylene and benzene from methanol , so that ethylbenzene can be produced at low cost

Method used

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  • Device and method for preparing ethylbenzene by catalytic conversion of alcohol ether
  • Device and method for preparing ethylbenzene by catalytic conversion of alcohol ether

Examples

Experimental program
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Effect test

Embodiment 1

[0020] The catalyst used was prepared by adding 0.5% lanthanum to a commercial aromatization catalyst. 100% conversion of methanol feedstock at 400°C, pressure 0.4 MPa (gauge pressure), in aromatization system 1 (using a fluidized bed reactor) under the condition that the weight space velocity of methanol is 0.3 g / gcat / h Produces the following products on a carbon-based mass basis: 3% methane and ethane, 12% ethylene, 24% C 3 -C 5 Hydrocarbons, 2% Benzene, 25% Toluene, Xylene and C 10 Aromatic hydrocarbons. After passing through the gas-liquid separation subsystem 3 and the gas-gas separation subsystem 4, the obtained C 3 -C 5 Hydrocarbons are recycled back to aromatization system 2 (using a fluidized bed reactor) at 550°C, pressure 0.4MPa (gauge pressure) and C 3 -C 5 The reaction was carried out under the condition that the weight space velocity of hydrocarbon was g / gcat / h, and the net conversion was 60%. Then the obtained product is brought into the gas-liquid separa...

Embodiment 2

[0022] The catalyst used was prepared by adding 1% lanthanum and 2% cerium to a commercial aromatization catalyst. Pure dimethyl ether was converted at 500° C. under a pressure of 0.1 MPa (gauge pressure), and under the condition that the weight space velocity of dimethyl ether was 12 g / gcat / h. The following products were produced in aromatization system 1 (using a fixed bed reactor) based on carbon-based mass: 3.5% methane and ethane, 12% ethylene, 30% C 3 -C 5 Hydrocarbons, 10% Benzene, 23% Toluene, Xylene and C 10 Aromatic hydrocarbons. After passing through the gas-liquid separation subsystem 3 and the gas-gas separation subsystem 4, the obtained C 3 -C 5Hydrocarbons are recycled back to aromatization system 2 (using a fixed bed reactor) at 700°C, pressure 0.1MPa (gauge pressure) and C 3 -C 5 The reaction was carried out under the condition of a weight space velocity of 10 g / gcat / h, and the net conversion rate was 70%. Then the obtained product is brought into the g...

Embodiment 3

[0024] A commercial aromatization Zn / ZSM-5 catalyst was added with 0.5% cerium to prepare the catalyst used to convert 50% dimethyl ether, 45% methanol and 5% water feedstock at 475°C, pressure 2MPa (gauge pressure), Under the condition that the weight space velocity of methanol is 30 g / gcat / h. In aromatization system 1 (using a fluidized bed reactor) the following products were produced on a carbon-based mass basis: 6% methane and ethane, 8% ethylene, 28% C 3 -C 5 Hydrocarbons, 10% Benzene, 23% Toluene, Xylene and C 10 Aromatic hydrocarbons. After passing through the gas-liquid separation subsystem 3 and the gas-gas separation subsystem 4, the obtained C 3 -C 5 Hydrocarbons are recycled back to aromatization system 2 (using a fluidized bed reactor) at 600°C, pressure 2MPa (gauge pressure) and C 3 -C 5 The reaction was carried out at a weight space velocity of hydrocarbons of 7 g / gcat / h with a net conversion of 69%. Then the obtained product is brought into the gas-liqu...

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Abstract

The invention discloses a device and method for preparing ethylbenzene by catalytic conversion of alcohol ether, belonging to the field of chemical industry. The device comprises two aromatization reaction subsystems, a toluene disproportionation subsystem, an alkylation subsystem of ethylene and benzene and three separation subsystems. By using the device, alcohol ether raw materials can be converted to the greatest extent into the benzene and ethylene which are in a match magnitude, the confluence of the same materials among different subsystems is effectively achieved, simultaneously, a dried gas at the outlet of the alkylation subsystem is directly used as a process gas of the toluene disproportionation subsystem, and the separation of ethylene and ethane is realized. Compared with the existing device and technique for independently producing the ethylene and benzene, the device and method disclosed by the invention have the characteristics of wide raw material adaptability, short separation flow, no rigorous separation condition and low energy consumption; and the yield and purity of the product are high.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a device and a method for preparing ethylbenzene by catalytic conversion of an alcohol ether. Background technique [0002] Ethylbenzene is a very important petrochemical product. Most of the polystyrene in the world is obtained by the dehydrogenation and repolymerization of ethylbenzene. Generally, ethylene is obtained by alkylation of two raw materials, ethylene and benzene. Because they belong to different manufacturing systems, generally obtained pure benzene or pure ethylene requires great separation engineering and energy consumption. For example, the molecular weight of ethylene and ethane is very small and requires cryogenic technology to separate. In the petroleum route, there are hundreds of compounds similar to benzene, and their separation requires complex aromatic extraction techniques. This leads to the high cost of using the two to carry out the alky...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C15/073C07C2/66B01J29/40
CPCY02P20/52
Inventor 骞伟中魏飞
Owner TSINGHUA UNIV
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