Deep cooling and film coupled ethylene cyclic refrigeration system non-condensed effluent gas separating and recycling technology

A refrigeration system, separation and recovery technology, applied in the field of petrochemical industry, can solve the problems of ineffective recovery, unfavorable discharge of non-condensable gas, easy occurrence of total condensation, etc.

Active Publication Date: 2019-07-12
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

Simple cryogenic separation mainly has the following limitations: the impact of cryogenic temperature fluctuations is large, when the cryogenic temperature is not low enough, the recovery effect is not obvious, and when the cryogenic temperature is too low, total condensation is prone to occur, which

Method used

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  • Deep cooling and film coupled ethylene cyclic refrigeration system non-condensed effluent gas separating and recycling technology
  • Deep cooling and film coupled ethylene cyclic refrigeration system non-condensed effluent gas separating and recycling technology

Examples

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Embodiment

[0015] The separation and recovery process provided by the invention is used to treat the non-condensable exhaust gas produced by the ethylene circulation refrigeration system of a 60,000-ton / year butyl rubber plant. The pressure of the non-condensable exhaust gas is 1.64MPaG, the temperature is -38°C, and the ethylene content is about 97mol%, so the annual loss of ethylene is about 212 tons of ethylene.

[0016] The non-condensable exhaust gas S-1 discharged from the ethylene circulation refrigeration system 1 first enters the bottom of the rectification tower 2, and contacts with the deep condensate returning from the top of the tower in countercurrent, and the heavy component ethylene in the gas phase is cooled and liquefied, and dissolved in the deep condensate The absorbed non-condensable oxygen and nitrogen are desorbed; the liquid ethylene S-2 separated in the rectification tower 2 is returned to the ethylene circulation refrigeration system 1 from the bottom of the towe...

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Abstract

The invention provides a deep cooling and film coupled ethylene cyclic refrigeration system non-condensed effluent gas separating and recycling technology, and belongs to the technical field of petrochemical engineering. According to the technology, starting from the characteristics of an ethylene cyclic refrigeration system, deep cooling conditions formed through ethylene throttling expansion areutilized for conducting liquidation and rectification on non-condensed effluent gas, most of ethylene is recycled in the form of the liquid state, then, a gas film is used for separating and enriching ethylene left in deep cooling tail gas, and low-pressure ethylene-rich gas obtained on the permeation side returns to a compressor of the ethylene cyclic refrigeration system. Deep cooling and filmseparation coupling is adopted for treating the non-condensed effluent gas, and ethylene losses are obviously reduced while oxygen and nitrogen accumulation is avoided. Taking a butyl rubber device of60,000 tons/year as an example, by adoption of the provided efficient non-condensed effluent gas separating and recycling technology, the ethylene content of the tail gas exhausted towards a torch islower than 5.0 vol%, the ethylene recycling rate reaches 99%, about 210 tons of ethylene can be recycled every year, and the annual economic benefits exceed 2 million yuan.

Description

technical field [0001] The invention relates to a process for separating and recovering non-condensable exhaust gas from an ethylene circulation refrigeration system coupled with cryogenic and membrane, and belongs to the technical field of petrochemical industry. The process first uses the cryogenic conditions formed by ethylene throttling and expansion to liquefy and rectify the non-condensable exhaust gas, recover most of the ethylene in liquid form, and then separate and enrich the residual ethylene in the cryogenic tail gas through gas membrane separation and enrichment. On the permeation side The obtained low-pressure ethylene-rich gas is returned to the compressor of the ethylene cycle refrigeration system. The non-condensable exhaust gas is treated through the coupling of cryogenic and membrane separation, which significantly reduces the loss of ethylene while avoiding the accumulation of oxygen and nitrogen. Background technique [0002] Ethylene is an important ba...

Claims

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Application Information

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IPC IPC(8): F25J3/02F25J5/00F25B43/04B01D53/22
CPCB01D53/22F25B43/043F25J3/0295F25J5/00F25J2215/62
Inventor 贺高红杨晓航阮雪华代岩郭明钢肖红岩
Owner DALIAN UNIV OF TECH
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