SU192178A1 - METHOD FOR CONCENTRATING ETHYLENE WITH POOR GASES - Google Patents

Description

There is a known method for concentrating ethylene from lean gases by adsorbing it on zeolites, followed by desorption on the heated sorbent with a blowing light-oxidizing gas. In the implementation of this procedure, the complete recovery of the substance from the adsorbent layer due to the use of lightly concentrating stripping gases, as well as the impossibility of further use of the stripping gas, is not achieved.

A method for the conceptualization of ethylene is proposed, in which gas is used as the stripping gas, which is condensed under the conditions of the desorption process and forms a reaction mixture with ethylene, for example nitrogen, carbon monoxide or a mixture of these gases. The method allows to intensify the process.

Example 1. To test the proposed method, ethylene desorption from zeolite NaX C - 202-115 is carried out at a temperature of 190 ° C. The adsorbent is preliminarily saturated with ethylene by passing through a 30% mixture of it with hydrogen at a mpr temperature of 190 ° C. After the establishment of the adsorption equilibrium, which has been tuned to the identity of the compositions of the gas entering and leaving the column with hell, sorbent, desorption of the previously absorbed ethylene is carried out. To do this, pure hydrogen gas is passed through the column at a rate of oO cm / cm min.

The temperature in the column during the desorption period is also 190 ° C.

Example 2. The proposed method can be used to concentrate ethylene in the poor, in particular coke oven gases. To do this, dried coke gas, purified from COA, is fed to the adsorption section of the unit e with a moving layer of zeolnt, operating at the atmospheric pressure. Non-absorbed gases (Pg, Nu, CO, and most of the ethane) are discharged from the upper part of the column, and the adsorbent, saturated with ethnlen, is sent to the heating section, where it is heated by circulating hot desorbcin gas. The sorbent heated to 200 ° C in the desorption section is finally freed from ethnylene absorbed in the section, blown out with a small amount of P or CO, or with the mixture of PCN CO. The purge gases of the desorption section enter the heating section and are mixed with the main quantity of the desorption gas, and the sorbent does not flow into the section for cooling. In this case, the exhaust gases from the top of the column can be used to cool the sorbent. The cold regenerated sorbent is returned to the top of the column. 3 with gas, or with both of these gases, depending on which gas was used in the cooling section for stripping ethylene. The subject of the invention is a method of concentrating ethylene from lean gases by adsorbing it on zeolites with 4 subsequent desorption on the heated sorbent with stripping gas, characterized in that, in order to intensify the desorption process, gas is used as the stripping gas. This process condenses under the conditions of a modified desorption process and forms a reaction mixture with ethylene (for example, nitrogen, carbon monoxide or a mixture of these gases).