Single-system one-step series-connected pressure swing adsorption process

Abstract

The single system one-step series pressure swing adsorption process is characterized by that in the system formed from at least three adsorption towers the raw material gas is fed into X tower to make adsorption, the outputted off-test product gas is fed into Y tower to make adsorption and obtain qualified product gas, when the adsorbable component in the product gas will exceed standard, the output can be cut off, at this time X tower adsorption is completed, then other pressure swing adsorption steps are made; at the same time the raw material gas can be fed into Y tower to make adsorption, and its outputted off-test product gas can be fed into Z tower to make adsorption and outupt qualified product gas. Said operation can be circularly made, and can further raise utilization rate of adsorbent.

Description

1. Technical field [0001] The invention belongs to the technical field of pressure swing adsorption gas separation, and specifically relates to a single-system one-step series pressure swing adsorption process, that is, a process for realizing a series pressure swing adsorption process in a set single-stage adsorption regeneration cycle system. 2. Background technology [0002] The mixed gases with different separation coefficients produced in the chemical production process can be separated into easily adsorbed components and difficultly adsorbed components by pressure swing adsorption method, and then recycled. [0003] For the method that can simultaneously obtain easily adsorbed components and difficultly adsorbed components through separation, there is a one-step parallel system in the prior art, such as CN1195572A. Under the condition of one-step parallel adsorption, the easily adsorbed components are not allowed to penetrate the adsorption bed in large quantities, oth...

AI Technical Summary

Problems solved by technology

Obviously, these methods can improve the utilization rate of the adsorbent and the purity of the difficult-to-adsorb components to a certain extent, but because the saturation depth of the second-stage adsorption is not enough, the adsorbent is still not fully utilized, and there are two sets of systems. There are disadvantages such as large area, complex system, many program-controlled valves, heavy maintenance workload, short trouble-free running time, and large construction investment.

In addition, if a large-scale pressure swing adsorption system needs multiple towers to feed in at the same time, it cannot be guaranteed that the gas at the outlet of the first system can be sent to the inlet of the second system according to the concentration of easily adsorbed components from low to high, resulting in system Decreased adsorption efficiency