Deep cooling and separating method of low-carbon olefin gas

Abstract

The invention discloses a deep cooling and separating method of low-carbon olefin gas. The deep cooling and separating method comprises the following steps: (1) synthesizing low-carbon olefin gas, cooling the low-carbon olefin gas, removing organic oxides of the low-carbon olefin gas, and enabling the olefin gas to enter a dethanizing column; (2) enabling a gaseous material on the top of the dethanizing column to enter a demethanizer, outputting a methane material from the top of the demethanizer, outputting mixed carbon II from the column kettle material of the demethanizer to an ethylene rectifying tower, and separating ethylene and ethane; (3) outputting the tower kettle material of the dethanizing column to a depropanizer, and outputting a mixed carbon III material separated on the topof the demethanizer to a propylene rectifying tower to obtain propylene and propane; and transporting carbon IV and heavy component separated from the tower kettle of the depropanizer to a debutanizer, and separating to obtain a mixed carbon IV material, carbon V and a heavy component. According to the characteristics of the component and constitution of the low-carbon olefin gas prepared by converting the synthetic gas, the polymeric ethylene and propylene can be separated from the low-carbon olefin gas, and the separated products such as the methane and hydrogen are sent back to a syntheticgas pipe network on the upstream of an olefin production reactor to be reused.

Description

technical field [0001] The invention belongs to the technical field of refining low-carbon olefins, and relates to a cryogenic separation method for producing low-carbon olefins after converting synthesis gas. Background technique [0002] Ethylene and propylene are the most basic chemical raw materials. Among them, the production capacity of ethylene represents the chemical production level of a country. With the development of my country's national economy, the demand for basic chemical raw materials is increasing. Although many of them have been put into production in recent years Large-scale chemical projects, but still cannot meet the demand, and a large amount of ethylene and propylene must be imported every year. [0003] Conventional ethylene and propylene production methods are produced by cracking petroleum products or producing oxygen-containing compounds (currently methanol is typically used), but petroleum cracking methods rely too much on petroleum, and my count...

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Problems solved by technology

[0002] Ethylene and propylene are the most basic chemical raw materials. Among them, the production capacity of ethylene represents the chemical production level of a country. With the development of my country's national economy, the demand for basic chemical raw materials is increasing. Although many of them have been put into production in recent years Large-scale chemical projects, but still cannot meet the demand, and a large amount of ethylene and propylene must be imported every year

[0003] Conventional ethylene and propylene production methods are produced by cracking petroleum products or producing oxygen-containing compounds (currently methanol is typically used), but petroleum cracking methods rely too much on petroleum, and my country's petroleum resources are relatively scarce, and the The content of alkynes and dienes is high, and the pressure of synthesis gas is also low, which is not conducive to further separation in the later stage; the production method of oxygenates has high requirements on production equipment, and fluidized bed reactors, regenerators and other equipment are required. In the production process, it is easy to produce many problems such as wear, running agent, blockage, etc.

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