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

A method for desulfurization and light hydrocarbon removal from natural gas by using ionic liquid

An ionic liquid and natural gas technology, applied in the field of desulfurization and desulfurization of light hydrocarbons, can solve the problem of no separation effect of light hydrocarbon components, and achieve the effects of low saturated vapor pressure, simplified process route and high separation efficiency.

Active Publication Date: 2016-09-07
ZHEJIANG UNIV
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patent purifies natural gas with ethanol solution of conventional imidazole type ionic liquid, but this method can only remove sulfide and carbon dioxide in natural gas, for C in natural gas 2 ~C 4 The light hydrocarbon components have no separation effect

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Absorbent composition: [P 4444 ][C 5 h 11 COO] Tetrabutylphosphonium n-hexanoate pure ionic liquid absorbent. Raw natural gas composition (molar ratio): methane 79.8%, ethane 1.9%, propane 7.6%, butane 5.6%, hydrogen sulfide 1.1%, sulfide 305mg / m 3 , Mercaptan 421mg / m 3 and other components.

[0039] The raw natural gas is pressurized to 1.0MPa through the compressor, and the temperature is lowered to 15°C by cooling, and it is passed into the bottom of the absorption tower, and the absorbent is added to the top of the absorption tower to ensure that most of the C 2 ~C 4 Hydrocarbons and organic sulfides are absorbed, and the C-rich 2 ~C 4 Absorption liquid of hydrocarbons and organic sulfides, methane-rich gas and a small amount of almost insoluble H in the absorbent are obtained at the top of the tower 2 , CO, N 2 Wait for gas.

[0040] The absorption liquid at the bottom of the tower enters the light hydrocarbon desorption tower, adopts the method of temper...

Embodiment 2

[0042] Absorbent composition: [N 4444 ][C 7 h 15 COO] tetrabutylammonium octanoate pure ionic liquid absorbent. Raw natural gas composition (molar ratio): 81.5% methane, 8.5% ethane, 8.5% propane, 5.1% butane, 1.0% hydrogen sulfide and other components.

[0043] As in Example 1, the raw natural gas and the absorbent are contacted and absorbed in countercurrent at 5°C and 2.5 MPa, and the light hydrocarbon components are desorbed by the absorption liquid at a temperature of 50°C. Hydrogen sulfide is desorbed at 0.1MPa, and the absorbent is recovered and recycled at the bottom of the tower. Hydrogen sulfide removal rate: 97.6%, ethane removal rate: 91.4%, propane removal rate: 95.2%, butane removal rate: 97.7%.

Embodiment 3

[0045] Absorbent composition: [bmpyrr][Bu 2 PO 4 ] N, N-butyl methylpyrrolidone phosphate dibutyl ionic liquid, N-methylpyrrolidone mixed absorbent, the ionic liquid accounts for 95% (volume fraction). Raw natural gas composition (molar ratio): methane 88.2%, ethane 5.9%, propane 2.0%, butane 0.9%, hydrogen sulfide 1.2% and other components.

[0046] As in Example 1, the raw natural gas and the absorbent are contacted and absorbed in countercurrent at 10°C and 1.8 MPa, and the light hydrocarbon components are desorbed by raising the temperature of the absorbing liquid at 55°C, and the absorbing liquid is then desorbed through a sulfide desorption tower at 85°C and 85°C. Hydrogen sulfide is desorbed at 0.05MPa, and the absorbent is recovered and recycled at the bottom of the tower. Hydrogen sulfide removal rate: 97.5%, ethane removal rate: 92.1%, propane removal rate: 96.7%, butane removal rate: 97.1%.

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

PropertyMeasurementUnit
volume ratioaaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for desulfurizing and removing light hydrocarbons from natural gas by using ionic liquids. Firstly, ionic liquids or mixed solvents of ionic liquids and molecular solvents are used as absorbents to contact natural gas to absorb sulfides, light hydrocarbons and carbon dioxide in natural gas. , to obtain the absorption liquid and the remaining tail gas; the light hydrocarbon mainly contains C 2 ~C 4 Alkanes or alkenes; and then the absorption liquid is desorbed in two stages, and the light hydrocarbons and sulfides are desorbed in turn, and the absorbent obtained by desorption is recycled. The invention provides a method for removing sulfur and light hydrocarbons from natural gas by using ionic liquid or a mixed solvent composed of ionic liquid and molecular solvent as absorbent. The designed ionic liquids with long alkyl side chains in the anions have high selective solubility of hydrogen sulfide, light hydrocarbons and other gases, which are superior to conventional ionic liquids, thus achieving efficient removal of sulfides and recovery of light hydrocarbons.

Description

technical field [0001] The invention relates to the field of separation and purification of natural gas, in particular to a method for desulfurizing and delighting hydrocarbons from natural gas by using ionic liquid. Background technique [0002] As an important resource material, natural gas is also a particularly important basic raw material gas in the chemical industry. Due to the needs of some downstream processes and the recovery and utilization of resources, it is necessary to desulfurize natural gas and recover light hydrocarbons. At present, the absorption method is mostly used for desulfurization and light hydrocarbon removal in natural gas. [0003] The Chinese patent document with publication number CN101016492A discloses a low-temperature methanol washing process for decarbonization and desulfurization of natural gas raw material gas. Full contact, the hydrogen sulfide and carbon dioxide in the feed gas are absorbed by lean methanol, and the methanol-rich liqui...

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 Patents(China)
IPC IPC(8): C10L3/10B01D53/14
Inventor 赵旭邢华斌任其龙杨启炜苏宝根张治国鲍宗必苏云
Owner ZHEJIANG 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