Multicore and multivariable metal-organic framework materials and their synthesis and application

Abstract

The invention provides a multi-core multi-variable metal organic framework material and its synthesis and application. The metal organic framework material, its molecular formula is {(NH 2 (CH 3 ) 2 )[W 9 (μ 3 -OH) 2 (μ 4 -OH)(X) 2 (Y) 8 (Z)]} n ; Among them, W is Co 2+ or Ni 2+ ; X is 4,4',4"'-(pyridine-2,4,6-triyl)tribenzoic acid, phenyl-1,3,5-tribenzoic acid, 4,4',4"-all Triazine‑2,4,6‑triylbenzoic acid; Y is isonicotinic acid, trifluoroisonicotinic acid, trimethylisonicotinic acid; Z is terephthalic acid, naphthalene dicarboxylic acid, thiophenedicarboxylic acid, Dibromobenzoic acid; n is the number of repeating units. The metal organic framework material can selectively adsorb acetylene in carbon dioxide. And it can be used repeatedly, the adsorption cost is low, and it has a great application prospect in the industrial purification of acetylene and the recovery of acetylene.

Description

technical field [0001] The invention belongs to the technical field of metal-organic framework materials, and in particular relates to a multi-core and multi-variable metal-organic framework material and its synthesis and application. Background technique [0002] Acetylene (C 2 h 2 ) is a highly flammable and reactive gas widely used in lighting, welding and cutting metals, and also as a basic raw material for the manufacture of acetaldehyde, acetic acid, benzene, synthetic rubber and synthetic fibers. Usually high-purity C 2 h 2 is the most basic requirement to safeguard these applications; however, impurities such as carbon dioxide (CO 2 ) are always present in acetylene production. C 2 h 2 and CO 2 Their similar molecular size, sublimation temperature, and critical temperature make their separation challenging. [0003] At present, only a few refineries use cryogenic distillation to convert C 2 h 2 with CO 2 Separation, but the energy consumption of the separ...

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Problems solved by technology

[0003] At present, only a few refineries use cryogenic distillation to convert C 2 h 2 with CO 2 Separation, but the energy consumption of the separation process is huge, the cost is too high, and there is no economic benefit. When the pressure exceeds the absolute pressure of 2 bar, C 2 h 2 Potential explosion hazard

However, when the pressure swing adsorption separation method is used to separate acetylene mixed gas, the yield and purity of acetylene are not high due to the low selectivity of conventional adsorbents for acetylene.

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