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

Pressure swing adsorption gas separation method, using adsorbents with high intrinsic diffusivity and low pressure ratios

A pressure swing adsorption, adsorbent technology, applied in specific gas purification/separation, separation method, dispersed particle separation, etc., can solve problems such as high energy consumption and pressure drop

Inactive Publication Date: 2001-04-18
PRAXAIR TECH INC
View PDF3 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pressure drop across the bed is very high (48 kPa / m) due to the high energy consumption of 0.7 kWh / Nm3 oxygen (20kW / TPDO)

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
  • Pressure swing adsorption gas separation method, using adsorbents with high intrinsic diffusivity and low pressure ratios
  • Pressure swing adsorption gas separation method, using adsorbents with high intrinsic diffusivity and low pressure ratios
  • Pressure swing adsorption gas separation method, using adsorbents with high intrinsic diffusivity and low pressure ratios

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0077] Example: VPSA performance comparison---oxygen production

[0078]A series of pilot plant tests were carried out with adsorbents Z-0 and Z-2 (as described in Table 1 above) to verify the benefits of the present invention for VPSA air separation. In all the tests, the adsorption pressure was maintained at about 1.5 bar, while the desorption pressure was changed so that the pressure ratio reached the requirements of 5.1, 3.3, and 2.6. Note that the term "pressure ratio" is defined as the pressure ratio of the adsorption to desorption process, and the measurement is carried out at the end of adsorption and desorption respectively.

[0079] The intermediate plant is composed of two beds, the operation of which is out of phase, one cycle and several steps similar to those described by Bakshi et al. in US 5,518,526. The details are as follows. The performance results for producing 90% purity oxygen are summarized in Table 2 below.

[0080] Table 2

[0081] The performance improve...

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
particle sizeaaaaaaaaaa
Login to View More

Abstract

A gas separation process incorporating the invention combines use of an adsorbent having high intrinsic diffusivity with a low pressure ratio PSA cycle. Further enhancements to the process are derived from the use of fast cycles, shallow beds and small particles-especially in a radial bed configuration. The combination of low pressure ratio, high rate adsorbents and fast cycles has been found to result in an unexpected simultaneous reduction in bed size factor (BSF) and power consumption. These benefits have been achieved while minimizing a decline in product recovery through use of the high rate adsorbent. The net result is a significant reduction in product cost.

Description

Invention field [0001] The present invention relates to pressure swing adsorption (PSA) and vacuum pressure swing adsorption (VPSA) methods in gas separation, and more specifically to an air separation that reduces the cost of oxygen products by adopting a low pressure ratio and using a high intrinsic diffusivity adsorbent Methods. Background of the invention [0002] In the past thirty years, vacuum shift adsorption (VSA), PSA and VPSA methods have made significant developments for gas separation, and the main progress has been made in the past ten years. These methods have been called negative pressure method, super atmospheric pressure method and transition atmospheric pressure method respectively. Unless otherwise specified, PSA is used below to represent any or all of these methods. Improvements in adsorbents, process cycles, and advances in the design of adsorption towers have all promoted the commercialization of these methods. [0003] High-exchange lithium molecular siev...

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): B01D53/02B01D53/04B01D53/047B01J20/18C01B13/02
CPCB01D2253/1085B01D2257/102B01D2259/402B01D2259/40043B01D2253/304B01D2256/12B01D2259/4146C01B13/0259B01J20/18B01D2259/4003B01D2259/40075B01D53/0476B01D53/0431B01D53/0446B01D53/0423B01D2257/104B01D2256/10B01D2253/108C01B2210/0046B01D53/04B01D53/047Y10S95/902B01D53/053
Inventor M·W·阿克利J·斯默拉雷克
Owner PRAXAIR TECH INC
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