Method for recovering ethylene and hydrogen from refinery dry gases through cold oil absorption, pressure swing adsorption (PSA) and membrane separation

A pressure swing adsorption and refinery dry gas technology, which is applied in hydrogen separation, hydrocarbon purification/separation, chemical instruments and methods, etc., can solve the problems of low yield, inability to realize refinery dry gas, and low purity, and achieve High yield, reduced operating cost, and improved purity

Active Publication Date: 2014-09-10
SICHUAN TECHAIRS
View PDF5 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The invention provides a method for recovering ethylene and hydrogen from refinery dry gas by cold oil absorption, pressure swing adsorption, and membrane separation, which solves the problems of low

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for recovering ethylene and hydrogen from refinery dry gases through cold oil absorption, pressure swing adsorption (PSA) and membrane separation
  • Method for recovering ethylene and hydrogen from refinery dry gases through cold oil absorption, pressure swing adsorption (PSA) and membrane separation
  • Method for recovering ethylene and hydrogen from refinery dry gases through cold oil absorption, pressure swing adsorption (PSA) and membrane separation

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0037] Example 1:

[0038] like figure 1 As shown, the method for absorbing, PSA, membrane separation and recovering ethylene and hydrogen in a refinery dry gas cooling oil described in this embodiment includes the following steps:

[0039] (1) Compression and boosting: refining the hydrogen content of 18.5%, the ethane content of 14.5%, the ethylene content of 16%, the methane content of 30%, the nitrogen content of 14.5%, the content of components above carbon 2 and 3.5%, and the acid gas content of 3%. After the dry gas (volume ratio) of the plant is compressed in the first stage and the second stage, the pressure is increased to 2.0MPa;

[0040](2) Cold oil absorption: the dry gas from the refinery that has been boosted in step (1) is cooled, and then sent to the absorption tower, the top of the absorption tower discharges non-condensable gas rich in methane, hydrogen and nitrogen, and the bottom of the absorption tower Effluent the absorbed carbon 2 and above components...

Example Embodiment

[0046] Example 2:

[0047] like figure 1 As shown, the method for absorbing, PSA, membrane separation and recovering ethylene and hydrogen in a refinery dry gas cooling oil described in this embodiment includes the following steps:

[0048] (1) Compression and boosting: refining the hydrogen content of 46.5%, the ethane content of 12.4%, the ethylene content of 6.0%, the methane content of 20%, the nitrogen content of 9.5%, the content of components above C2 2.2%, and the content of acid gas 3.2%. After the dry gas (volume ratio) of the plant is compressed in the first stage and the second stage, the pressure is increased to 2.8MPa;

[0049] (2) Cold oil absorption: the dry gas from the refinery that has been boosted in step (1) is cooled, and then sent to the absorption tower, the top of the absorption tower discharges non-condensable gas rich in methane, hydrogen and nitrogen, and the bottom of the absorption tower Effluent the absorbed carbon 2 and above components;

[0...

Example Embodiment

[0055] Example 3:

[0056] like figure 1 As shown, the method for absorbing, PSA, membrane separation and recovering ethylene and hydrogen in a refinery dry gas cooling oil described in this embodiment includes the following steps:

[0057] (1) Compression and boosting: refining the hydrogen content of 18.5%, the ethane content of 14.5%, the ethylene content of 16%, the methane content of 30%, the nitrogen content of 14.5%, the content of components above carbon 2 and 3.5%, and the acid gas content of 3%. After the dry gas (volume ratio) of the plant is compressed in the first stage and the second stage, the pressure is increased to 3.6MPa;

[0058] (2) Cold oil absorption: the dry gas from the refinery that has been boosted in step (1) is cooled, and then sent to the absorption tower, the top of the absorption tower discharges non-condensable gas rich in methane, hydrogen and nitrogen, and the bottom of the absorption tower Effluent the absorbed carbon 2 and above component...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a method for recovering ethylene and hydrogen from refinery dry gases through cold oil absorption, pressure swing adsorption (PSA) and membrane separation. The method has the advantages and beneficial effects that main components such as hydrogen, ethylene and the like are obtained from the refinery dry gases through the steps of compression and pressure increase, cold oil absorption, PSA, membrane separation, desorption, normal coarse distillation and the like; the main components are clearly separated; meanwhile, under the actions of PSA and membrane separation, the purity of various components can be more than 99%, the yield of hydrogen can reach 90-95%, the purity of ethylene is 99%, and the yield of ethylene can reach 92-98%; the whole recovery flow is reasonable; the method has the characteristics of high yield, high purity, low operating cost and lower energy consumption.

Description

technical field [0001] The invention relates to the field of classified recovery of refinery dry gas, in particular to methods for refining dry gas cold oil absorption, pressure swing adsorption, membrane separation and recovery of ethylene and hydrogen. 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 alkanes from refinery dry g...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C10G70/00C01B3/50C07C11/04C07C7/00
Inventor 蔡跃明钟雨明钟娅玲
Owner SICHUAN TECHAIRS
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap