Method and device for separating hydrogen and ethylene from refinery dry gas by shallow condensing adsorption-absorption

A refinery dry gas, shallow cold absorption technology, applied in hydrogen separation, hydrocarbon purification/separation, chemical instruments and methods, etc., can solve the problems of low product purity, high energy consumption, etc., to reduce energy consumption, save refrigeration amount, the effect of reducing investment

Active Publication Date: 2014-09-10
SICHUAN TECHAIRS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Cryogenic separation has the advantages of recovering hydrogen and ethylene ethane at the same time, mature process, and relatively high recovery rate. It is generally suitable for the occasions where a large amount of dry gas is processed, especially suitable for areas where refineries are concentrated. The disadvantage of cryogenic separation is that the product purity is not high. and high energy consumption

Method used

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  • Method and device for separating hydrogen and ethylene from refinery dry gas by shallow condensing adsorption-absorption

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Embodiment 1

[0023] The hydrogen content is 56.2%, ethane content is 7.2%, ethylene content is 6.2%, methane content is 22.2%, nitrogen content is 5.5%, carbon two or more components content is 0.9%, acid gas content is 1.8% (the gas percentages mentioned in this article are all The dry gas of a refinery with a pressure of 1 MPa is pretreated. Then reduce the temperature of the pretreated refinery dry gas to 5 to 10 degrees Celsius, and enter the first adsorption tower for the first adsorption. The temperature during the first adsorption is controlled at 5 to 10 degrees Celsius; the pressure at the time of entry remains unchanged .

[0024] It is clear to those skilled in the art that low-pressure adsorption is an existing process, and its principle will not be repeated here. In this step, the adsorbent filled in the first adsorption tower adsorbs carbon two components, a small amount of hydrogen, methane, nitrogen and more than carbon two components, and the unadsorbed hydrogen, methane and...

Embodiment 2

[0035] In this embodiment and on the basis of embodiment 1, the carbon dioxide mixture discharged from the top of the desorption tower is further processed, and a rectification tower is added. The middle inlet of the rectification tower is connected to the top outlet of the desorption tower

[0036] The discharge from the top of the desorption tower is sent to the rectification tower for rectification. The carbon two components from the top of the rectification tower can directly enter the ethylene rectification tower to obtain high-purity product ethylene. It is sent to the ethane cracking furnace to obtain high-purity product ethylene.

[0037] In this embodiment, the recovery rate of ethylene in the refinery dry gas can reach 90%, and the recovery purity can reach 99%.

Embodiment 3

[0039] The device and method used in this embodiment are the same as those used in embodiment 2. The gas components of the dry gas input to the refinery are 41.4% hydrogen content, 11.3% ethane content, 8.4% ethylene content, 21.4% methane content, 11% nitrogen content, The content of C2 and above components is 2.9%, the acid gas content is 3.6%, the dry gas pressure of the refinery is 1 MPa; the temperature of the dry gas of the refinery is reduced to 5 degrees Celsius, and the temperature during the first adsorption is controlled at 5 degrees Celsius; The pressure is 1 MPa, the hydrogen recovery rate is 90%, the recovery purity is over 99%, the ethylene recovery rate can reach 92%, and the recovery purity reaches 99%.

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Abstract

The invention relates to a method for separating and extracting hydrogen and ethylene from refinery dry gas by shallow condensing adsorption-absorption. The method comprises the steps of: S1, carrying out adsorption for the first time on pretreated refinery dry gas of which the pressure is 0.5MPa; S2, pressurizing ethylene-enriched dry gas in the step S1 to 1-2MPa and carrying out shallow condensing absorption; and S3, enabling absorbing liquid obtained by shallow condensing absorption in the step S2 to be subjected to desorption. The invention also discloses a device for separating hydrogen and ethylene from refinery dry gas by shallow condensing adsorption-absorption. The device comprises a first adsorption tower, a second adsorption tower, a shallow condensing absorption tower, a desorber, an expander, a compressor and a pretreatment unit. According to the method and device disclosed by the invention, since C2 is separated and concentrated by virtue of carrying out shallow condensing absorption and low pressure adsorption absorption prior to the shallow condensing absorption, non-condensable gases, such as hydrogen are prevented from entering into the shallow condensing absorption unit, and thus the operating load and energy consumption of absorption are reduced and the investment of cost is decreased.

Description

Technical field [0001] The invention relates to the field of classification and recovery of dry gas in a refinery, and relates to a method and a device for extracting hydrogen and ethylene by shallow cooling adsorption-absorption and separation of dry gas in a refinery. Background technique [0002] The useful components in refinery dry gas are mainly hydrogen, light olefins and light alkanes. These components are very valuable in the dry gas of the refinery, but at present, a large amount of them are still not optimally utilized. Instead, they are directly used as fuel, and some are even directly ignited and vented. Refinery dry gas contains both hydrogen and a large amount of light olefins and light alkanes. These components can be separated and used separately, which is more beneficial than using them directly as fuel or as raw materials for hydrogen production and methanol synthesis. [0003] The technologies for recovering hydrogen, light olefins and light alkanes from dry g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G70/00C01B3/50C07C11/04C07C7/00
CPCY02P20/10Y02P20/50
Inventor 蔡跃明钟雨明张学文
Owner SICHUAN TECHAIRS
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