A kind of separation method of ethylene ethane

Abstract

Disclosed is a method for separating ethylene from ethane, comprising the following steps: bring a mixture of ethylene and ethane into contact with an ultramicroporous anion-pillared hybrid material, and selectively adsorbing ethylene molecules so as to separate ethylene from ethane, wherein the ultramicroporous anion-pillared hybrid material is expressed by the general formula of [L2-M-A]n, where same is constructed by an organic ligand L, an inorganic fluorine-containing anion A and a metal ion M through coordination bonds, in which n is a positive integer, representing the fact that the ultramicroporous anion-pillared hybrid material is formed by regularly arranging several structural units composed of L2-M-A; the organic ligand L is pyrazine; the inorganic fluorine-containing anion A is any one of SiF6 2-, GeF6 2-, TiF6 2-, SnF6 2-, and NbF6 -; and the metal ion M is any one of Fe2+, Co2+, and Ni2+. The invention realizes the selective identification of ethylene, and at the same time, the selective separation of ethylene and ethane can also be realized by means of a kinetic diffusion rate, and as such, a high-purity (99.99%) of ethylene and ethane can be obtained.

Description

technical field [0001] The invention belongs to the technical field of chemical separation, and in particular relates to an anion hybrid ultramicroporous material used for the separation of ethylene and ethane. Background technique [0002] As an important basic chemical raw material, ethylene mainly comes from the cracking of natural gas and petroleum hydrocarbons. It is one of the chemical products with the largest output in the world. The ethylene industry is the core of the petrochemical industry. Ethylene products account for more than 75% of petrochemical products. As one of the important symbols to measure the development level of a country's petrochemical industry, it has a pivotal position. Ethylene is mainly used to produce polymers such as polyethylene and ethylene-propylene rubber, and high purity is required in the utilization process. In addition, ethane can be used as the main raw material for steam cracking to produce ethylene, which has a high demand. [0...

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Problems solved by technology

The core is to choose a good adsorbent. The ideal adsorbent should have the characteristics of large adsorption capacity, large separation factor and long service life. However, the currently used molecular sieve or porous material adsorbents have low adsorption capacity or low selectivity. Disadvantages, such as the capacity of NaY molecular sieve to ethylene at normal temperature and pressure is 2.1mmol / g, but the separation selectivity of ethylene / ethane is only 1.4 (AICHE Journal,1995,41(3):509-517); metal organic framework MaterialCu(BTC) 2 Although the adsorption capacity to ethylene is 6mmol / g at normal temperature and pressure, the ethylene / ethane separation selectivity is only 1.2 (Micropor.Mesopor.Mater., 2002,55(2):217-230); all-silicon molecular sieve ITQ-55 achieves ethylene / ethane separation through the kinetic difference of ethylene and ethane diffusion, but the adsorption capacity for ethylene is only 1.3mmol / g at normal temperature and pressure; patent CN 105251442A reports a loaded CuCl adsorbent, ethylene ethane The separation ratio can reach 8.25, but the adsorption capacity for ethylene is only 1.25mmol / g, and this kind of material is easy to deactivate, which is not conducive to industrial application

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