Method for separating and purifying hydrogen from water gas by pressure swing adsorption

A pressure swing adsorption method, water gas technology, applied in separation methods, using solid contact hydrogen separation, hydrogen separation and other directions

Inactive Publication Date: 2011-06-01
甘肃银光聚银化工有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since it is filled with various adsorbents like this, an adsorption tower with a large volume is required

Method used

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  • Method for separating and purifying hydrogen from water gas by pressure swing adsorption
  • Method for separating and purifying hydrogen from water gas by pressure swing adsorption
  • Method for separating and purifying hydrogen from water gas by pressure swing adsorption

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Raw gas quality requirements

[0063] components

CO

CH 4

CO 2

O 2

H 2

N 2

content%

32～40

≤0.2

≤11.0

≤0.4

48～53

≤6.0

[0064] Decarbonization semi-product gas CO 2 ≤0.75%.

[0065] Product CO gas output: 5200Nm 3 / h, temperature: 40°C, pressure: 0.65MPa.

[0066] Product CO purity: CO≥99.0%, CH 4 +H 2 ≤0.2%, CO 2 ≤0.3%, total sulfur ≤0.5ppm, N 2 ≤1.3%, dew point -40℃.

[0067] Product hydrogen output: 9000Nm 3 / h, temperature: 40°C, pressure: 1.3MP.

[0068] Product hydrogen purity: H 2 ≥99.9%, CO≤10ppm, CO 2 ≤10ppm, total sulfur ≤0.5ppm, O 2 ≤20ppm, dew point -40℃.

[0069] The process conditions of each adsorption tower and tank are controlled in the following table:

[0070]

[0071] PSA-1 adsorption regeneration steps and process parameters

[0072]

[0073] PSA-2 adsorption regeneration steps and process parameters

[0074]

[0075] PSA-3 adsorption regene...

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Abstract

The invention relates to a method for separating and purifying hydrogen from water gas by pressure swing adsorption. Raw material gas is sequentially subjected to a PSA-1 (Pressure Swing Adsorption) decarburization working procedure, a PSA-2 CO purification working procedure and a PSA-3 H2 purification working procedure. Six adsorption beds ABCDEF of a primary adsorption tower T1, seven adsorption beds ABCDEFG of a secondary adsorption tower T2 and eight adsorption beds ABCDEFGH of a tertiary adsorption tower T3 are mainly provided. Backward discharge gas in the PSA-3 H2 purification working procedure is used as the outward blowing gas for the PSA-1 decarburization working procedure, thereby increasing the hydrogen yield by about 3%; forward discharge gas recovered by the six beds of PSA-1 is circularly purified at the inlet of a raw material gas compressor, thereby reducing the loss of effective components in the decarburization working procedure; the content of methane in the process product gas generated by the seven beds of PSA-2 is decreased to 0; and the yield of the product CO is improved to be above 80%.

Description

technical field [0001] The invention relates to a method for separating and purifying hydrogen from water gas by means of pressure swing adsorption (PSA). Background technique [0002] Toluene diisocyanate (TDI) is one of the most used isocyanate products in the world and one of the main raw materials of polyurethane. The TDI production process is mainly formed by the reaction of carbon monoxide (CO) provided by the gas purification device and chlorine gas provided by the chlor-alkali device to generate phosgene (COCL 2 ), hydrogen (H 2 ) and dinitrotoluene (DNT) provided by the nitration unit to generate toluenediamine (TDA), and then by TDA and COCL 2 The reaction produces TDI. At present, several large companies producing TDI in the world use their own proprietary technology, and all use the traditional phosgene method without exception. These companies are Bayer (BAYER), BASF (BASF), Dow Chemical (DOWS CHEM), Rhone Poulene (RHONE POULENE), Eni Chemical (ENI CHEM), Ol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/047C01B3/56
CPCY02P20/151
Inventor 李晓明丁连河施玉宏张国义崔晓锦李晓照
Owner 甘肃银光聚银化工有限公司
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