Method for regenerating absorbent

Abstract

The invention relates to a rich absorbent regeneration technique for separating gas for absorbent. The technique comprises the following steps: a membrane module is used as unit equipment, and the rich absorbent flows in the shell side of the membrane module; gas penetrating through the membrane enters a pipeline and is pumped by a vacuum pump to a collection tank for recovery; regenerated absorbent is collected into a liquid storing tank for reuse; rich liquid of absorption liquid enters a filter to be filtered for feed liquid regeneration; the filtered feed liquid is measured through a flowmeter and enters a heat exchanger to be heated to a set temperature (30-70 DEG C); the heated liquid enters the membrane module to carry out distilling separation; regenerated feed liquid enters an absorption tower after being measured by the flowmeter; acidic gas generated by desorption is measured by a gas flowmeter at the outlet of the pipeline of the membrane module; and the acidic gas enters a condenser for condensation and recovery. The method provided by the invention can regenerate rich absorbent at the temperature which is 50-100 DEG C lower than a general method, can regenerate absorbent in a temperature range of 30-70 DEG C and saves energy by 50-200 percent compared with a traditional generation method, thereby having favorable economic and social benefits.

Description

technical field [0001] The invention belongs to the technical field of absorbent recovery and utilization, in particular to the rich absorbent regeneration technology for separating gas by absorbent. Background technique [0002] Absorption is an important operation unit of chemical separation engineering. The absorption processes mainly include packed tower method, swirl plate tower method, spray tower method, impact method, etc. The absorbent used for absorption and separation will lose its activity after running for a certain period of time, and it needs to be regenerated or desorbed before it can continue to be used, otherwise it will be thrown away as waste. The current regeneration methods are almost all desorption with high temperature in the re-tower. [0003] Natural gas is a mixture of hydrocarbons and various impurities, including acid gases such as hydrogen sulfide and carbon dioxide. The purification of natural gas is mainly based on the ammonia method. Nearly...

AI Technical Summary

Problems solved by technology

Using this process to regenerate 1 cubic meter of absorbent requires 100-200 kilograms of steam, and the energy consumption is quite high

Although a lot of improvements have been made to the structure of the absorption tower, the type of filler and the composition of the absorbent through a large number of industrial practices and laboratory research over the years, the effect is not great.

Images