Ethylene low-temperature purification device

Abstract

The invention discloses an ethylene low-temperature purification device, which is mainly used for treating tail gas generated in a synthesis process or an ethylene production process taking ethylene as a raw material, such as defoaming gas generated in a preparation process of a vinyl acetate-ethylene copolymer, tail gas generated in an ethylene production process and the like. The process tail gas generally contains ethylene, vinyl acetate or heavy components, nitrogen, methane, ethane, oxygen, carbon dioxide, water or methanol and the like, and ethylene product gas with the purity reaching 99.5% (mole) or above can be obtained through the device. A cryogenic separation cold box unit integrating a molecular sieve adsorption purification unit, a plate-fin heat exchanger (6/40/41), a heavy component separation tank, an ethylene separation tank or an ethylene purification tower, a low-temperature separation cold box unit of an ethylene storage tank or a liquid refrigerant siphon tank, a refrigerant compressor unit and a connecting pipeline is adopted by the device, the device has the characteristics of low energy consumption, small investment, easiness in adjustment and the like, and the overall economic benefit of an enterprise is improved.

Description

technical field [0001] The invention relates to a low-temperature purification device for ethylene, which belongs to the field of low-temperature gas separation. Background technique [0002] In the existing factories, the treatment methods for the tail gas produced in the synthesis process using ethylene as a raw material or in the production process of ethylene, such as the defoaming gas produced in the preparation process of vinyl acetate-ethylene copolymer, and the tail gas in the ethylene production process are all processed. In order to eliminate the emission of torch burning, incomplete combustion of some components will produce carbon monoxide, carbon black and other substances that directly pollute the environment, and complete combustion will also produce carbon dioxide gas, aggravating the global greenhouse effect; Realize the clean production of factories, reduce greenhouse gas emissions, and achieve carbon neutrality goals. At the same time, these exhaust gases...

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Problems solved by technology

[0002] In the existing factories, the treatment methods for the tail gas produced in the synthesis process or ethylene production process using ethylene as raw material, such as the defoaming gas produced in the preparation process of vinyl acetate-ethylene copolymer, and the tail gas in the ethylene production process, etc. In order to reduce emissions from torch incineration, the incomplete combustion of some components will produce carbon monoxide, carbon black and other substances that dir...

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