Variable-pressure adsorption method using auxiliary system

A pressure swing adsorption method and auxiliary system technology, applied in separation methods, chemical instruments and methods, dispersed particle separation, etc., can solve the problems of low partial pressure of easily adsorbed components, insufficient saturation depth, energy consumption, etc., and improve the utilization rate , large adsorption capacity, and the effect of improving purity

Inactive Publication Date: 2003-02-12
王玉
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, this improves the utilization rate of the adsorbent to a certain extent and improves the purity of the difficult-to-adsorb components, but the saturation depth of the first-stage adsorption is not enough, and the adsorbent is still not fully utilized, so after the pressure equalization is completed, the easily-adsorbed components The purity of the parts is not enough, but also pressurized replacement
As we all know, the pressurized displacement process takes up system cycle time and is also an energy-consuming process
Moreover, in the series adsorption, since the second stage uses all the gas output from the first stage as raw material gas, the amount of adsorbent used and the volume of equipment for the second stage of adsorption must be matched with the first stage, and its cost will inevitably be higher. At the same time, the partial pressure of easily adsorbed components in the second-stage feed gas is low, resulting in low utilization efficiency of the second-stage adsorbent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] This embodiment is used for hydrogen extraction from methanol tail gas, and the gas pressure of the raw material is 1.8MPa gauge pressure. This embodiment adopts the A.62220+B.31114 process, that is, the main system A is a six-tower process, in which the two towers are fed at the same time, the two towers are evacuated at the same time, and the pressure is equalized directly twice without indirect pressure equalization; the auxiliary system B It is a three-tower process, in which a single tower is fed in, a single tower is evacuated, one direct pressure equalization, and four indirect pressure equalizations. In each period of the adsorption regeneration cycle of the main system and the auxiliary system, the steps of each tower are shown in Tables 1 and 2.

[0022] A1

Adsorption and output of hydrogen

output to system B

A2

two bucks

release pressure

evacuate

A3

take time out

triple boost

Final punch

...

Embodiment 2

[0028] This embodiment is used for shift gas separation in urea production, and the feed gas pressure is 0.8 MPa gauge pressure. This embodiment adopts the A.C4320+B.81131 process, that is, the main system A is a twelve-tower process, in which four towers are fed at the same time, three towers are evacuated at the same time, the two towers are directly equalized, and there is no indirect pressure equalization process: Auxiliary system B It is an eight-tower process, with single-tower air intake, single-tower evacuation, three direct pressure equalizations and one indirect pressure equalization. In each period of the adsorption regeneration cycle of the main system and the auxiliary system, the steps of each tower are shown in Table 3 and Table 4.

[0029] A1

Adsorption and output of hydrogen and nitrogen

output to system B

A2

two bucks

release pressure

take time out

A3

evacuate

triple boost

Final punch

A4

...

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PUM

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Abstract

A pressure-variable adsorption process with auxiliary system features use of a primary adsorption-regeneration cyclic system composed of two or more adsorption towers and an additional adsorption-regeneration cyclic system also composed of two or more adsorption towers. The charge gas is input to the said primary system which outputs the components difficult to be adsorbed. When the content of the components easily adsorbed in the primary system is going to go beyond the standard value, its output is switched to the said additional system. It can simulatenious obtain high-purity easily adsorbed components and difficultly adsorbed components with high output rate and low cost.

Description

1. Technical field [0001] The invention belongs to the technical field of pressure swing adsorption gas separation, and in particular relates to a pressure swing adsorption method with an auxiliary system, which can make it easier to realize the large-scale pressure swing adsorption device. 2. Background technology [0002] Most of the mixed gas produced in the chemical production process can be divided into easy-adsorbed components and difficult-adsorbed components, so it can be separated, recovered and utilized by pressure swing adsorption method. [0003] For the pressure swing adsorption method that can simultaneously obtain easily adsorbed components and difficultly adsorbed components, there is a one-step method disclosed in the prior art, such as CN1195572A. Under the condition of one-step method, the easily adsorbed components are not allowed to penetrate the adsorption bed in large quantities, otherwise the outlet of the adsorption tower will be polluted by the easi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/047
Inventor 王玉
Owner 王玉
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