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Pressure swing adsorption method for separating hydrogen, nitrogen and pure carbon dioxide from transformation gas

A pressure swing adsorption method and a gas shift technology, which is applied in the field of pressure swing adsorption and can solve the problems of easy nitrogen loss, equipment investment and energy consumption increase.

Inactive Publication Date: 2003-08-13
伍仁兴 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially the yield of nitrogen, due to the N 2 It has a certain adsorption capacity, and the PSA method is more likely to lose nitrogen than the wet method. On the other hand, the CO in the coal gas conversion gas 2 Excess for urea synthesis, therefore, requires the extraction of pure CO 2 The amount can meet the urea synthesis, if the purified CO 2 If the amount is too large, it will cause an increase in equipment investment and energy consumption

Method used

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  • Pressure swing adsorption method for separating hydrogen, nitrogen and pure carbon dioxide from transformation gas
  • Pressure swing adsorption method for separating hydrogen, nitrogen and pure carbon dioxide from transformation gas
  • Pressure swing adsorption method for separating hydrogen, nitrogen and pure carbon dioxide from transformation gas

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Coal is used as raw material, and the shift gas of coal gas produced by introducing air during the gas production process is used as raw material gas to separate pure CO 2 And hydrogen, nitrogen product gas.

[0043] figure 1 , figure 2 For the technological process of this embodiment, image 3 , Figure 4 It is the operating program table of the present embodiment.

[0044] Typical composition of shift gas using coal as raw material: component CO 2 CO H 2 N 2 CH 4 h 2 S H 2 O concentration V% 25-30 0.3-3 45-55 18-22 1-2 <150PRm Saturation temperature 25-40℃ Pressure 0.6~0.8MPa

[0045] figure 1 and figure 2 The process flow charts of two groups of adsorption towers are respectively, figure 1 for the first group, figure 2 For the second group, the two groups operate in series, and the first group is to convert the CO in the gas 2 Purify to more than 98%, meet the requirements of synthetic urea, the second group function is to purify part ...

Embodiment 2

[0120] Fig. 5 is a process flow chart of the present embodiment, and Fig. 6 is a process table of the process steps of the present embodiment. In this implementation, there are two groups of adsorption towers in group A and group B, group A has six adsorption towers A1-A6, and group B has six adsorption towers B1-B6. Group A and Group B operate in series, and Group A is used to purify CO 2 , Group B is used to remove crude hydrogen and CO in nitrogen 2 . The difference from Embodiment 1 is that in this embodiment, each column in group A is operated in series with a corresponding column in group B.

[0121] The shift gas pressure, composition, and temperature used in this example are the same as those in Example 1.

[0122] The adsorbents filled in the adsorption towers of group A are three kinds of adsorbents: activated alumina, activated carbon and silica gel, which form a combined bed from bottom to top in turn, and silica gel adsorbents are filled in the adsorption tower...

Embodiment 3

[0165] Other conditions are the same as in Example 1, except that crude hydrogen and ammonia are pressurized to 1.8Mpa and enter the second group of adsorption towers. Because the second group of pressure increases, the volume of the second group of adsorption towers is reduced to that of the first group. two thirds. The result of the operation is CO 2 Purity 99.5(V), yield greater than 70%, CO in hydrogen and nitrogen 2 Less than 0.2% (V), hydrogen yield 98.5%, nitrogen yield 94%.

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Abstract

The present invention relates to a pressure swing adsorption method for separating hydrogen, nitrogen and pure CO2 from conversion gas. Said conversion gas is one produced by using coal to make gas. It uses the series-connection operation of first and second groups of adsorption towers, in which its first group is used for preparing CO2, its outlet is hydrogen and nitrogen mixed gas containing CO2, the mixed gas is fed into second group of adsorption tower to prepare hydrogen and nitrogen. Said two groups of adsorption towers in one cyclic period includes the adsorption step A in turn: pressure-equalizing and reduction ED, vacuum-pumping VC, pressure-equalizing and boosting ED, and final boosting FR, and first group of adsorption tower possesses the CO2 conversion step P after pressure-equalizing ED and before vacuum-pumping VC.

Description

Technical field: [0001] The present invention is related to the separation of hydrogen, nitrogen and pure CO from the shift gas produced by introducing air or oxygen-enriched coal into gas during the gas production process using coal as raw material. 2 , related to the pressure swing adsorption method that replaces wet decarburization in urea production. Background technique: [0002] CO removal from shift gas in urea synthesis process 2 Usually physical absorption and chemical absorption are used. These methods use large amounts of solvents and are often referred to as wet methods. Some of these solvents have a large amount of loss, some have high toxicity, some have high regeneration energy consumption, some are unstable, and some have disadvantages such as corrosion, leakage and pollution of the environment, and troublesome decarbonization operations. [0003] As we all know, PSA has been successfully applied to various gas separation processes, and there are also pate...

Claims

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Application Information

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IPC IPC(8): B01D53/047
Inventor 伍仁兴
Owner 伍仁兴
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