Adsorbent for separating propylene and propane, and preparation method thereof

Abstract

The invention discloses an adsorbent for separating propylene and propane, and a preparation method thereof. The method comprises the following steps: adding ZnO into water, performing uniform mixing,adding N,N-dimethylformamide, and performing uniform mixing to obtain a ZnO nano-slurry solution; adding Cu(NO3)2.3H2O into the ZnO nano-slurry solution, and performing uniform mixing to obtain a mixed nano-slurry; adding an organic small-molecule modification reagent and trimesic acid into ethanol, and performing uniform mixing to obtain a mixed solution; and adding the mixed nano-slurry into the mixed solution, performing uniform mixing, standing for a synthesis reaction, filtering the obtained solution, and heating the obtained precipitate in vacuum to achieve activating treatment in orderto obtain the adsorbent for separating propylene and propane. Pyrrole or carbazole is introduced, so the adsorbent has an enhanced adsorption effect on C3H6, an increased C3H6/C3H8 selectivity and anenhanced water vapor stability, and has a good application prospect in C3H6/C3H8 adsorption separation.

Description

technical field [0001] The invention belongs to the technical field of adsorbent materials, and in particular relates to an adsorbent for separating propylene and propane and a preparation method thereof. Background technique [0002] Propylene is a key raw material for many fossil products, second only to ethylene in importance, and is an essential building block in the manufacture of various chemicals such as polypropylene and acrylonitrile. According to statistics, global propylene consumption reached 96 million tons in 2015 and will reach 120 million tons in 2020. Generally, propylene is produced from fossil fuel cracking at high temperatures or refinery dry gas, which contains less-absorbing propane. In order to obtain high-purity propylene, it is necessary to separate propylene and propane. At present, the main separation method is cryogenic distillation. Due to the close boiling points of propylene (47.6°C) and propane (42.2°C), the separation and purification proc...

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Problems solved by technology

[0005] The purpose of the present invention is to aim at the existing MOFs materials, most of which are C 3 h 6 / C 3 h 8 The selectivity of the separation is not high enough or there is a problem of water vapor instability and stability, providing a preparation with high C 3 h 6 / C 3 h 8 Selectivity and good water vapor stability of pyrrole@Cu-BTC and urazole@Cu-BTC composite adsorbents

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