Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for recovery of ethane from carbon dioxide-containing natural gas

A carbon dioxide and recovery method technology, applied in chemical instruments and methods, organic chemistry, hydrocarbons, etc., can solve the problems of increasing the liquid phase volume of the cryogenic separator, decreasing the recovery rate of ethane, increasing the energy consumption of the system, etc., reaching B Improve the recovery rate of alkane, reduce the energy consumption of the system, and improve the effect of cold and heat integration

Inactive Publication Date: 2019-03-29
SOUTHWEST PETROLEUM UNIV +1
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When raw gas CO 2 When the content increases, in order to control the demethanizer CO 2 Solids formation, increasing cryogenic separator liquid phase to demethanizer, typical ethane recovery process control CO 2 The capacity of freezing blockage increases, but the ethane recovery rate decreases rapidly, and the energy consumption of the system increases
[0004] To overcome the typical ethane recovery process described above image 3 For raw gas CO 2 The adaptability of the content is not strong, and the recovery rate of the ethane recovery device is improved. The present invention has developed a method for recovering ethane from natural gas containing carbon dioxide, which uses propane and butane-based liquid hydrocarbons to 2 Absorption, reducing CO in the gas phase of the demethanizer tray 2 Concentration, improve recovery unit to suppress CO 2 Solids Formation Capability and Ethane Recovery

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 recovery of ethane from carbon dioxide-containing natural gas
  • Method for recovery of ethane from carbon dioxide-containing natural gas
  • Method for recovery of ethane from carbon dioxide-containing natural gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Embodiment 1 of the present invention is attached Figure 4 As shown, the raw material gas composition and calculation basic data are as follows:

[0051] Raw gas processing scale: 500×10 4 m 3 / d

[0052] Raw gas pressure: 5.5MPa

[0053] Entry temperature: 38°C

[0054] Dry gas output pressure: ≥5.0MPa

[0055] Output pressure of ethane product: ≥2.0MPa

[0056] Compressor adiabatic efficiency: 75% (including external compressor, refrigeration compressor, booster end of expansion unit)

[0057] Isentropic efficiency at the expansion end of the expansion unit: 85%

[0058] The raw gas composition is shown in Table 1.

[0059] Table 1 Example 1 Feed gas composition

[0060] components

N 2

CO 2

C 1

C 2

C 3

iC 4

mol%

6.2329

1.0000

81.5141

6.9354

2.5627

0.4177

components

c 4

iC 5

c 5

C6

C 7 +

h 2 o

mol%

0.7013

0.1650

0.1345

0.1236

...

Embodiment 2

[0069] Embodiment 2 of the present invention is attached Figure 5 As shown, the raw material gas composition and calculation basic data are as follows:

[0070] Raw gas processing scale: 500×10 4 m 3 / d

[0071] Raw gas pressure: 5.0MPa

[0072] Entry temperature: 38°C

[0073] Dry gas output pressure: ≥5.0MPa

[0074] Output pressure of ethane product: ≥2.0MPa

[0075] Compressor adiabatic efficiency: 75% (including external compressor, refrigeration compressor, booster end of expansion unit)

[0076] Isentropic efficiency at the expansion end of the expansion unit: 85%

[0077] The raw gas composition is shown in Table 2.

[0078] Table 2 Example 2 feed gas composition

[0079] components

N 2

CO 2

C 1

C 2

C 3

iC 4

mol%

4.2227

1.0000

77.4702

10.8874

4.0661

0.5768

components

c 4

iC 5

c 5

C6

C 7 +

h 2 o

mol%

0.9806

0.2542

0.2175

0.1642

0...

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 recovery of ethane from carbon dioxide-containing natural gas. On the basis of expander refrigeration-partial dry gas circulation process, the absorption principleof propane and butane based liquid hydrocarbon to CO2 is applied in a low temperature separation process, part of feed gas and part of the liquid phase in a low temperature separator are mixed and undercooled to enter the middle-upper part of a demethanation tower, part of outward transportation gas flows back and is mixed with part of the liquid phase in the low temperature separator, then the mixture enters the top of the demethanation tower after undercooling, thus increasing the content of propane and butane based liquid hydrocarbon at the middle-upper part of the demethanation tower, lowering the concentration of CO2 in a demethanation tower tray gas phase, and strengthening the ability of an ethane recovery device in inhibiting CO2 solid formation. At the same time, the method increases the cooling capacity at the middle-upper part of the demethanation tower, and enhances the ethane recovery rate. The method strengthens the ability of the demethanation tower in inhibiting CO2 solid formation, also increases the ethane recovery rate, effectively improves the economic benefits of the ethane recovery device operation, and is suitable for ethane recovery devices with a feed gasCO2 content greater than 0.5%.

Description

technical field [0001] The invention relates to the technical field of natural gas treatment technology, in particular to an ethane recovery method for natural gas containing carbon dioxide. Background technique [0002] In recent years, with the development of the natural gas industry, the ethane recovery of natural gas has attracted the attention of major oil and gas fields, and has become a new economic growth point for major oil and gas fields. In the cryogenic device for the purpose of ethane recovery, in order to achieve a higher ethane yield, it is necessary to reach a certain refrigeration depth. However, CO in natural gas 2 Become the biggest obstacle restricting the refrigeration temperature, when the CO in natural gas 2 At higher levels, ethane recovery units may form CO 2 Solids, resulting in equipment freezing and safety hazards, while reducing the recovery rate of ethane. To control CO 2 Freeze plugging, raw gas CO can be set 2 Removal device, the process...

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
Patent Type & Authority Applications(China)
IPC IPC(8): C07C9/06C07C7/11C07C7/00
CPCC07C7/11C07C7/00C07C9/06
Inventor 蒋洪杨雨林朱聪
Owner SOUTHWEST PETROLEUM UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com