A method and device for the separation of hydrocarbon cracking gas and the production of ethylbenzene

A technology for cracking gas and ethylbenzene, which can be used in the purification/separation of hydrocarbons, ethylene production, chemical instruments and methods, etc., and can solve problems such as poor anti-fluctuation ability

Active Publication Date: 2022-05-13
DALIAN UNIV OF TECH
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Problems solved by technology

This patent adopts the pre-deethanization and intermediate cold separation process, which can obtain higher concentration of ethylene gas. The lowest temperature in the system is -38°C. There is no need to add ethylene compressors and cold boxes, and the equipment investment cost is relatively low. However, the ethylene gas produced by this proc

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  • A method and device for the separation of hydrocarbon cracking gas and the production of ethylbenzene

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Embodiment

[0027] Taking a certain hydrocarbon catalytic cracking device as an example, adopt the device and method of the present invention, wherein, the pre-demethanizer precooler, the pre-demethanizer feed tank, the demethanizer pre-cooler, the demethanizer feed tank, Multiple ethylene-containing dry air cooling recoverers and ethylene-ethane air cooling recoverers can be set up according to requirements. In this embodiment, the above-mentioned equipment is all one, and the process is shown in figure 1 .

[0028] The gas-phase hydrocarbon cracking gas A and the liquid-phase hydrocarbon cracking gas B that have been treated by upstream impurity removal enter the fuzzy separation unit provided by the present invention. The flow rate of A is 40.2t / h, the temperature is 10°C, and the pressure is 3.32MPaG. The flow rate is 33.8t / h, the temperature is 10°C, and the pressure is 3.32MPaG. The composition is shown in Table 1 and Table 2 respectively. The gas-phase cracked gas A is pre-cooled ...

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Abstract

The invention provides a hydrocarbon cracking gas separation and a method and device for producing ethylbenzene, which are applied in the technical field of separation and utilization of hydrocarbon cracking devices. Process: After pre-cooling and separation, the products processed in the upstream enter the demethanizer and the pre-demethanizer respectively. The gas phase at the top of the demethanizer is recovered as ethylene-containing dry gas, which enters the downstream gas-phase legal ethylbenzene reactor, and the bottom of the demethanizer Both the production and the bottom production of the pre-demethanizer enter the deethanizer, and the liquid phase ethylene ethane gas is produced from the top of the deethanizer, and the ethylene ethane gas enters the downstream liquid phase ethylbenzene reactor. The outlet materials of the two types of reactors pass through the ethylbenzene separation unit to obtain high-purity ethylbenzene products. Compared with the conventional ethylene cryogenic separation process combined with the pure ethylene liquid-phase ethylbenzene process device, the present invention has the advantages of lower investment cost, relatively simple process, low comprehensive energy consumption of the device group, and strong anti-interference ability.

Description

technical field [0001] The invention belongs to the technical field of separation and utilization of cracked gas products of a hydrocarbon cracking device, and relates to a method and a device for obtaining ethylene-containing dry gas and ethylene-ethane mixed gas through fuzzy separation of cracked gas, and further preparing high-purity ethylbenzene. Background technique [0002] Ethylene is one of the most produced chemicals in the world, an important product in the petrochemical industry, and a basic chemical raw material for the production of the three major synthetic materials. Ethylene can react with benzene to produce ethylbenzene. Ethylbenzene is an important chemical raw material. The production processes mainly include gas-phase method and liquid-phase method. The former is currently mostly used to process catalytic cracking dry gas, while the latter has higher requirements on the purity of ethylene. Ethylene is usually produced by thermal cracking or catalytic cra...

Claims

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Application Information

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IPC IPC(8): C07C7/00C07C7/04C07C2/64C07C11/04C07C15/073
CPCC07C7/005C07C7/04C07C2/64C07C11/04C07C15/073Y02P30/40
Inventor 刘邓斌邹雄陈晓宇朱炜玄韩志忠董宏光
Owner DALIAN UNIV OF TECH
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