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

Full-temperature process pressure swing adsorption method for preparing pure methane from natural gas

A pressure swing adsorption, natural gas technology, applied in adsorption purification/separation, chemical instruments and methods, hydrocarbon purification/separation, etc., can solve the problems of difficult desorption, inability to desorb, high energy consumption and investment, and save heat and energy. The effect of regeneration gas, low investment and operating costs, and long service life

Inactive Publication Date: 2016-07-20
SICHUAN TECHAIRS
View PDF3 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a full temperature-range pressure swing adsorption method for preparing pure methane from natural gas. It is a new method for preparing pure methane. The methane is purified by FTrPSA, and the operating temperature of 60-150 ° C is used to solve the problem of adsorption. The problem that the hydrocarbon components in the phase cannot be desorbed or is difficult to desorb greatly improves the service life of the adsorbent; compared with the cryogenic distillation method, it also solves the problems of high energy consumption and high investment in the prior art

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
  • Full-temperature process pressure swing adsorption method for preparing pure methane from natural gas
  • Full-temperature process pressure swing adsorption method for preparing pure methane from natural gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Such as figure 1 Shown, a kind of whole temperature range pressure swing adsorption method of preparing pure methane from natural gas, the steps of this method are as follows:

[0035] (1) PSA purification process;

[0036] a. In the pressure swing adsorption system, 1000m3 / h raw natural gas enters from the bottom of the adsorption tower and then adsorbed. The adsorption pressure is 0.05~1.5Mpa, the operating temperature is 60~80℃, and multiple adsorption towers are alternately cycled to ensure natural gas Continuous entry; the pressure swing adsorption system is composed of 6 adsorption towers; 1 to 5 adsorption towers are in the adsorption state, and the rest of the adsorption towers are in the regeneration state. one or more kinds;

[0037] b. Unadsorbed CH4 is discharged from the top of the adsorption tower to obtain pure methane products;

[0038] c. The hydrocarbon components such as C2 and above components in the adsorption phase are concentrated to 15~30%, an...

Embodiment 2

[0047] Such as figure 1 Shown, a kind of whole temperature range pressure swing adsorption method of preparing pure methane from natural gas, the steps of this method are as follows:

[0048] (1) PSA purification process;

[0049] a. In the pressure swing adsorption system, 10000m3 / h raw natural gas enters from the bottom of the adsorption tower and then adsorbed. The adsorption pressure is 2.0~3.0Mpa, the operating temperature is 80~110℃, and multiple adsorption towers are alternately cycled to ensure natural gas Continuous entry; the pressure swing adsorption system is composed of 10 adsorption towers; 1 to 9 adsorption towers are in the adsorption state, and the rest of the adsorption towers are in the regeneration state. one or more kinds;

[0050] b. Unadsorbed CH4 is discharged from the top of the adsorption tower to obtain pure methane products;

[0051] c. The hydrocarbon components such as C2 and above components in the adsorption phase are concentrated to 15~30%, ...

Embodiment 3

[0060] Such as figure 2 Shown, a kind of whole temperature range pressure swing adsorption method of preparing pure methane from natural gas, the steps of this method are as follows:

[0061] (1) PSA purification process;

[0062] a. Carry out in pressure swing adsorption system, described pressure swing adsorption system is made up of 10 adsorption towers, wherein 1~9 adsorption towers are in adsorption state, and all the other adsorption towers are in regeneration state, and the packing in adsorption tower is activated carbon, silica gel, One or more of activated alumina and molecular sieves; natural gas is used as raw material, the natural gas enters from the bottom of the adsorption tower and then adsorbed, the adsorption pressure is 3.0~3.5Mpa, the operating temperature is 120~150°C, and multiple adsorption towers are operated alternately and cyclically , to ensure the continuous entry of natural gas;

[0063] b. Unadsorbed CH4 is discharged from the top of the adsorpt...

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 full-temperature process pressure swing adsorption method for preparing pure methane from natural gas and relates to the technical field of methane purification. The method comprises a full-temperature process pressure swing adsorption purifying process and a desorbed gas recycling process; in the full-temperature process pressure swing adsorption purifying process, the adsorption pressure is 0.05-3.5Mpa, and the operation temperature is 60-150 DEG C; after evacuation and desorption, the CH4 not adsorbed is discharged from the top of an adsorption tower and used as a pure methane product; the hydrocarbon components of C2 and above are concentrated by a full-temperature process pressure swing adsorption device and then evacuated and desorbed by a vacuum pump before entering the desorbed gas recycling process; for recycling, a hydrocarbon recycling unit is adopted, which consists of first-level cooling, second-level cooling and a shallow cold oil absorption unit; heavy hydrocarbons are separated out after the second-level cooling, and the rest C2 and C3 hydrocarbon components are absorbed by cold oil, wherein the operation temperature of the cold oil absorption is (-10)-10 DEG C; and if the hydrocarbon components of C2 and above are not recycled, the desorbed gas is directly introduced into a combustion system or flare system.

Description

technical field [0001] The invention relates to the field of methane purification, in particular to a full temperature range pressure swing adsorption method for preparing pure methane from natural gas. Background technique [0002] Methane is widely distributed in nature. It is the hydrocarbon with the smallest carbon content (the largest hydrogen content), and it is also the main component of natural gas, biogas, oilfield gas and coal mine tunnel gas. It is an important raw material gas used as fuel to produce hydrogen, carbon black, carbon monoxide, acetylene, hydrocyanic acid and formaldehyde. When used as a raw material for chemical synthesis, methane must be of high purity to ensure effective downstream synthesis. Natural gas is mainly composed of methane, and the methane content of natural gas after pretreatment and purification exceeds 90%; methane in natural gas is liquefied at low temperature and pressure, that is, cryogenic rectification technology, to produce pu...

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): C07C7/12C07C7/00C07C9/04
CPCC07C7/12C07C7/005C07C9/04
Inventor 刘开莉陈运钟佳航蔡跃明钟雨明
Owner SICHUAN TECHAIRS
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