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A kind of method for recovering hydrogen, carbon two and above fraction light hydrocarbons

A distillate and hydrogen technology, applied in separation methods, hydrogen separation, chemical instruments and methods, etc., can solve the problems of low product purity, unsuitability, high energy consumption, etc., to simplify the process, reduce operating costs, and improve hydrogen purity Effect

Active Publication Date: 2016-03-30
SICHUAN TECHAIRS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of cryogenic separation are low product purity, large investment, high energy consumption, and it is not suitable for small and medium-scale refinery dry gas recovery, etc.

Method used

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  • A kind of method for recovering hydrogen, carbon two and above fraction light hydrocarbons
  • A kind of method for recovering hydrogen, carbon two and above fraction light hydrocarbons

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Such as figure 1 Shown, a kind of method that reclaims hydrogen, carbon two and above fraction light hydrocarbon, comprises the following steps:

[0035] One-stage compression step: dry the refinery with 56.2% hydrogen content, 7.2% ethane content, 0 ethylene content, 28.4% methane content, 5.5% nitrogen content, 0.9% carbon dioxide and above components, and 1.8% acid gas content. The pressure of gas (volume ratio) is raised to 0.7Mpa.

[0036] Purification step: use the existing low-temperature methanol washing process to remove carbon dioxide, sulfur dioxide, hydrogen sulfide and other acid gases in the refinery dry gas with a pressure of 0.7 MPa obtained in the first-stage compression step.

[0037] The first-stage PSA regeneration step: send the dry gas from the refinery to the first-stage PSA regeneration tower for pressure swing adsorption at 30°C. It is clear to those skilled in the art that pressure swing adsorption is an existing process, and its principle wi...

Embodiment 2

[0043] Such as figure 1 Shown, a kind of method that reclaims hydrogen, carbon two and above fraction light hydrocarbon, comprises the following steps:

[0044] One-stage compression step: Dry the refinery with 46.5% hydrogen content, 18.4% ethane content, 0 ethylene content, 20% methane content, 9.5% nitrogen content, 2.2% carbon dioxide and above components, and 3.2% acid gas content. The pressure of gas (volume ratio) is raised to 1.0Mpa.

[0045] Purification step: use the existing low-temperature methanol washing process to remove carbon dioxide, sulfur dioxide, hydrogen sulfide and other acid gases in the refinery dry gas with a pressure of 1.0 MPa obtained in the first-stage compression step.

[0046] The first-stage PSA regeneration step: send the dry gas from the refinery to the first-stage PSA regeneration tower for pressure swing adsorption at 35°C. It is clear to those skilled in the art that pressure swing adsorption is an existing process, and its principle wil...

Embodiment 3

[0052] Such as figure 1 Shown, a kind of method that reclaims hydrogen, carbon two and above fraction light hydrocarbon, comprises the following steps:

[0053] One-stage compression step: dry the refinery with 18.5% hydrogen content, 22.5% ethane content, 0 ethylene content, 38% methane content, 14.5% nitrogen content, 3.5% carbon dioxide and above components, and 3% acid gas content. The pressure of gas (volume ratio) is raised to 1.2Mpa.

[0054] Purification step: use the existing low-temperature methanol washing process to remove carbon dioxide, sulfur dioxide, hydrogen sulfide and other acid gases in the refinery dry gas with a pressure of 1.2 MPa obtained in the first-stage compression step.

[0055] The first-stage PSA regeneration step: the dry gas from the refinery is sent to the first-stage PSA regeneration tower for pressure swing adsorption at 40°C. It is clear to those skilled in the art that pressure swing adsorption is an existing process, and its principle w...

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PUM

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Abstract

The invention discloses a method for recovering hydrogen, carbon two and higher fraction light hydrocarbons. The method comprises the following steps: a first stage pressure swing adsorption regeneration, a second stage pressure swing adsorption desorption regeneration and no desorption cold oil absorption. The invention has the advantages that the method combines the adsorption separation method and no desorption cold oil absorption method for treating dry gas of refinery, in order to obtain high purity hydrogen and light hydrocarbons mainly containing carbon two and higher fractions, ensure high yield and achieve clear separation of hydrogen gas and light hydrocarbons. In the no desorption oil cool absorption step, propane is used as an absorbent, the absorption liquid can be directly sent to an ethane cracking furnace for cracking to obtain the product of ethylene, thereby omitting the desorption step and crude distillation steps, and reducing cost.

Description

technical field [0001] The invention relates to a method for treating tail gas, in particular to a method for recovering hydrogen and light hydrocarbons of fractions of C2 and above from refinery dry gas by combining pressure swing adsorption and non-desorption cold oil absorption. Background technique [0002] The useful components in refinery dry gas are mainly hydrogen, light olefins and light alkanes. These components are very valuable in refinery dry gas, but at present, a large amount of them have not yet been optimally utilized, but are directly used as fuel, and some are even directly ignited to vent. Refinery dry gas contains not only hydrogen, but also 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 raw materials for reforming hydrogen production and synthesizing methanol. [0003] The technologies for recovering hydrogen, light olefins and light...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G70/04C10G70/06C01B3/56B01D53/047B01D53/14
Inventor 蔡跃明钟雨明钟娅玲
Owner SICHUAN TECHAIRS