C 4 olefin desulfurization absorbent and production method and use thereof

Abstract

The invention relates to an adsorbent for deep desulfurization of materials containing C4 olefin, a preparation method and application thereof. The adsorbent for desulfuriztion consists of reduced VIII transition metal, reduced IB transition metal and IIB transition metal oxide which activate sulfur-containing molecules, and adhesive taking alumina as a main component. The adsorbent can adsorb nearly all sulfur compounds in the materials containing C4 olefin to get the materials containing C4 olefin with sulfur content lower than 5ng / mu l.

Description

A kind of carbon tetraolefin desulfurization adsorbent and its preparation method and application technical field The invention relates to a carbon tetraolefin ultra-deep desulfurization adsorbent. The present invention also relates to a preparation method of the above-mentioned desulfurization adsorbent. The present invention also relates to the application of the above-mentioned desulfurization adsorbent. Background technique As a product of petroleum cracking and refinery gas fractionation, C4 olefins will introduce trace (10-200ppm level) sulfur-containing impurities during the production process, usually hydrogen sulfide, carbonyl sulfide, mercaptan, sulfide, disulfide and thiophene, etc. . These sulfur-containing impurities will lead to catalyst poisoning in the further reaction of C4 olefins (such as polymerization, hydration reaction, etc.). Therefore, before the further reaction of C4 olefins, the removal of sulfur-containing impurities in olefins has attract...

AI Technical Summary

Problems solved by technology

The traditional method is to use the combination of alcohol amine desulfurization, alkali elution desulfurization and Merox extraction desulfurization. This process has certain limitations. It can only remove inorganic sulfur and low-carbon mercaptans, while for other organic sulfur such as carbonyl The desulfurization effect of sulfur, thiophene sulfur, etc. is not good, so it is difficult to desulfurize C4 olefins to below 5ppm

The existing single desulfurization process cannot remove various sulfides at the same time, and often requires the combined use of several desulfurization methods

And there are deficiencies in these desulfurization methods: first of all, whether it is alcohol amine refining, Merox extraction-liquid phase catalytic oxidation desulfurization, when the total sulfur content in the feed gas is high, the desulfurization effect is not good, and in Merox extraction- The catalyst used in the liquid-phase catalytic oxidation method is easy to deactivate; in addition, the existing method has a good effect on the treatment of inorganic sulfur, but the effect of removing organic sulfur is poor, especially for organic sulfur compounds with large molecular weight, such as mercaptans. , sulfide, thiophene, etc., the effect is very poor; in addition, the existing method also has the problem that the waste liquid and waste residue are difficult to handle

1. The depth of desulfurization is not enough, it is difficult to remove sulfur from 50-200ppm to below 5ppm;

2. The desulfurization process consumes a lot of energy, the operating conditions are harsh, and the operating costs are high;

3. The desulfurization process is not friendly to the environment