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Method for the separation of gases

A technology for separating gases and gases, applied in separation methods, gas treatment, semi-permeable membrane separation, etc., can solve problems such as difficulty in cleaning, clogged membrane, increased possibility, etc., and achieve the effect of reducing membrane clogging

Inactive Publication Date: 2012-05-02
ECO TECHNOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0052] If the membrane system is installed downstream of an FGD, there is an increased likelihood of gypsum particles being present in the scrubbed gas, which can clog the membranes and make them difficult to clean

Method used

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  • Method for the separation of gases
  • Method for the separation of gases
  • Method for the separation of gases

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0231] Example 1 illustrates how figure 1 The application of a 2-stage membrane separation process is shown in . However, since the process operates at room temperature, no gas cooling step is required. The feed gas stream contains 85% (v / v) N 2 , 10% (v / v) CO 2 , and 5% (v / v) O 2 A bottle of the gas mixture is passed through a first membrane separation system comprising a polydimethylsiloxane spiral wound membrane. The permeate stream was collected using a vacuum pump and pumped through a membrane purification system comprising a polydimethylsiloxane spiral wound membrane. The final permeate (purified CO 2 flow). Both membranes have a CO of about 4,000 Barrer 2 permeability and a CO of about 11 2 / N 2 selective. This 2-stage membrane separation step achieves approximately 86% CO 2 (v / v) purity, total CO 2 The recovery was about 83%.

[0232] The results of this test are provided in Table 1.

[0233] Table 1

[0234]

example 2

[0236] Example 2 illustrates how figure 1 The application of a 2-stage membrane separation process is shown in . However, since the process operates at room temperature, no gas cooling step is required. The feed gas stream contains 85% (v / v) N 2 , 10% (v / v) CO 2 , and 5% (v / v) O 2 A bottle of the gas mixture is passed through a first membrane separation system comprising a polydimethylsiloxane spiral wound membrane. The permeate stream was collected using a vacuum pump and pumped through a membrane purification system comprising a polyimide hollow fiber membrane. The final permeate (purified CO 2 flow). The polydimethylsiloxane membrane has a CO of about 4,000 Barrer 2 permeability and a CO of about 11 2 / N 2 selectivity, while the polyimide membrane has a CO of about 500Barrer 2 permeability and about 23 CO 2 / N 2 selective. This 2-stage membrane separation step achieves approximately 93% CO 2 (v / v) purity, total CO 2 The recovery rate was over 89%.

[0237] T...

example 3

[0242] Example 3 illustrates how figure 2The application of a 2-stage membrane separation process shown in , where an exhaust gas slipstream from a natural gas-fired combustion process is pumped through a first membrane separation system comprising a polydimethyl Spiral Wound Membrane of Silicone. The permeate was cooled in a gas cooler upstream of a vacuum pump and then pumped through a membrane purification system comprising a spiral wound membrane of polydimethylsiloxane. The final permeate was collected using a second vacuum pump. The vent gas from the membrane purification system is recycled to the feed to the first membrane separation system.

[0243] Both membranes have a CO of about 4,000 Barrer 2 permeability and a CO of about 11 2 / N 2 selective. This 2-stage membrane separation step achieves approximately 92% CO in the final permeate stream 2 (v / v) purity, total CO 2 The recovery rate is over 90%.

[0244] The results of this test are provided in Table 3. ...

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Abstract

A method (10) for the separation of gases involves the method steps of: i) passing an exhaust gas stream (27) containing CO2 through a first membrane separation system (30) to produce a pre-concentrated gas stream (34) containing at least carbon dioxide; and a reject stream; and ii) directing the pre-concentrated gas stream to at least one purification step (50) to produce a purified CO2 stream (55); wherein, sulphur-containing gases (SOx) are also substantially separated from the exhaust gas (27) by the first membrane separation step (30) into the pre-concentrated gas stream (34), and the purified CO2 stream (55) is substantially free of nitrogen gas.

Description

technical field [0001] The present invention relates to an improved method for separating gases. In particular, the method of the present invention involves the use of membrane separation to capture carbon dioxide and other desired gases and remove impurities therefrom. Background technique [0002] Due to global warming and its potential for carbon trading, in recent years it has been used to recover carbon dioxide (CO2) from combustion processes. 2 ) method has attracted more attention. While CO2 can be reduced by modifying industrial equipment and switching to natural gas instead of coal 2 release, but many agencies understand that CO 2 of capture for how much CO 2 Release to the atmosphere provides better control and potentially greater impact on both capital and operating costs. known to capture CO 2 technologies; these include cryogenic distillation, adsorption and absorption, and membrane separations. [0003] There have been various proposals for carbon seques...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/22B01D53/62B01D53/48B01D61/00
CPCY02C10/10B01D2257/404B01D2257/504B01D2257/302B01D2257/80B01D53/226Y02E20/32Y02C20/40
Inventor 拉里·艾伦·利恩托尼·皮卡罗
Owner ECO TECHNOL