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Metal organic frame material for separating ethane and ethylene and separation method of ethylene and ethane

A technology of metal-organic frameworks and metal ions, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve problems such as poor stability, easy collapse of structure, loss of separation performance, etc., and achieve stable performance and mild synthesis conditions , Good adsorption and separation effect

Active Publication Date: 2018-05-11
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Bloch et al. used the metal-organic framework material Fe-MOF-74 to effectively separate ethylene and ethane (Science 2012, 335, 1606-1610), with a selectivity of 13-18. However, the material has poor stability when exposed to water. The structure is easy to collapse and lose the separation performance in the humid environment containing water vapor

Method used

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  • Metal organic frame material for separating ethane and ethylene and separation method of ethylene and ethane
  • Metal organic frame material for separating ethane and ethylene and separation method of ethylene and ethane
  • Metal organic frame material for separating ethane and ethylene and separation method of ethylene and ethane

Examples

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Effect test

Embodiment 1

[0043] Mix 2mmol of anhydrous magnesium chloride, 4mmol of gallic acid, 5mmol of potassium hydroxide, and 10ml of deionized water into a 25mL hydrothermal reactor, stir for 30 minutes, and then heat to 120°C for 24 hours. After the reaction is completed, the reactor is cooled, and the solid obtained from the reaction is washed with water and ethanol several times in sequence to obtain a purified metal organic framework material. The purified adsorbent was vacuum degassed at 120 °C for 24 h to obtain the desolvated adsorbent, followed by gas adsorption.

[0044] To test the adsorption-separation performance of the above-synthesized MOFs, a single-component adsorption isotherm of ethylene ethane was carried out using the above-mentioned adsorbents. Take 100 mg of adsorbent and set the adsorption temperature to 25 degrees. After testing, at 25°C and 1 bar, the adsorption capacity of ethylene reaches 2.61mmol / g, and the adsorption capacity of ethane is only 0.21mmol / g. Calculated...

Embodiment 2

[0048] Mix 2mmol cobalt chloride hexahydrate, 4mmol gallic acid, 1.6mmol potassium hydroxide, and 10mL deionized water, put them into a 25mL hydrothermal reaction kettle, stir for 30 minutes, and react at 120°C for 24 hours. After the reaction is completed, wait for it to cool down, and wash with water and ethanol three times successively to obtain the purified metal-organic framework material. The purified adsorbent was vacuum degassed at 120 °C for 24 h to obtain the desolvated adsorbent, followed by gas adsorption.

[0049] To test the adsorption-separation performance of the above-synthesized MOFs, a single-component adsorption isotherm of ethylene ethane was carried out using the above-mentioned adsorbents. Take 100 mg of adsorbent and set the adsorption temperature to 25 degrees. After testing, at 25°C and 1bar, the adsorption capacity of ethylene reaches 2.87mmol / g, and the adsorption capacity of ethane is only 0.29mmol / g. Calculated by IAST, when the volume ratio of e...

Embodiment 3

[0053] Mix 2mmol nickel chloride hexahydrate, 4mmol gallic acid, 1.6mmol potassium hydroxide, and 10mL deionized water, put them into a 25mL hydrothermal reaction kettle, stir for 30 minutes, and react at 120°C for 24 hours. After the reaction was completed, the reactor was cooled, and washed three times with water and ethanol in sequence to obtain the purified metal-organic framework material. The purified adsorbent was vacuum degassed at 120 °C for 24 h to obtain the desolvated adsorbent, followed by gas adsorption.

[0054] To test the adsorption-separation performance of the above-synthesized MOFs, a single-component adsorption isotherm of ethylene ethane was carried out using the above-mentioned adsorbents. Take 100 mg of adsorbent and set the adsorption temperature to 25 degrees. After testing, at 25°C and 1bar, the adsorption capacity of ethylene reaches 1.83mmol / g, and the adsorption capacity of ethane is only 0.42mmol / g. Calculated by IAST, when the volume ratio of e...

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Abstract

The invention discloses a metal organic frame material for separating ethane and ethylene and a separation method of the ethylene and the ethane .The metal organic frame material has the advantages ofgood stability, high adsorption capacity, good adsorption and separation selectivity, simple preparation method and low preparation cost. The general structural formula of the metal organic frame material is M(C7O5H4).2H2O, wherein M is a metal ion, and the structure of the metal organic frame material is a three-dimensional network structure formed from a transition metal ion or an alkaline earth metal ion and gallic acid through coordinate bonds or intermolecular forces. A preparation method is as follows: (1) an inorganic salt, the gallic acid, an alkali, and deionized water are mixed according to a ratio, stirred and dissolved, and then put into a reaction kettle for hydrothermal reaction; the inorganic salt is a chloride salt, a nitrate salt, an acetate, a carbonate, a sulphate or aperchlorate of the metal ion; and (2) after the end of the hydrothermal reaction, the deionized water and absolute ethanol are in turn used for washing, and vacuum drying is performed. The metal-organic frame material is used as an adsorbent to perform adsorption separation of a mixed gas containing the ethylene and the ethane.

Description

technical field [0001] The invention relates to a metal organic framework material which can be used for the separation of alkanes and olefins and a preparation method thereof, and belongs to the technical field of adsorption and separation materials. Background technique [0002] Ethylene is one of the most important basic raw materials in the chemical industry, and its production capacity marks the development level of a country's petrochemical industry. At present, ethylene is widely used in the production of lubricants, plastics, polymers and other chemical materials. At this stage, ethylene is mainly obtained by cracking ethane or propane, while in my country it is mainly obtained by cracking naphtha as raw material. The products obtained by the cracking process are often complex in composition and often contain alkanes, monoolefins, dienes, alkynes, diacetylenes, etc. with different carbon numbers. In industrial production, high-purity polymer grade ethylene is often ...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/28B01J20/30C07C37/00C07C39/10
CPCB01J20/223B01J20/2808B01J20/28095C07C37/00C07C39/10
Inventor 鲍宗必任其龙王佳伟谢丹妍赵迎财邢华斌张治国杨启炜杨亦文
Owner ZHEJIANG UNIV
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