A method for separating a mixture of carbon-pentadienes

A separation method and technology for diolefins, which are applied in organic chemical methods, chemical instruments and methods, adsorption purification/separation, etc., can solve the problem of low separation selectivity of C5 diolefin system, low adsorption and separation selectivity, and inability to achieve sieving. Separation and other problems, to achieve the effect of high capacity and selectivity, environmental friendliness, and stable structure

Active Publication Date: 2022-05-17
ZHEJIANG UNIV
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Problems solved by technology

Michael Maes et al first reported the selective adsorption and separation of cis / trans-piperylene using the adsorption separation materials MIL-96, chabazite and 5A molecular sieve, but the selectivity of adsorption separation is not high, and the selectivity of adsorption capacity (298K, 0.1 bar, the ratio of adsorption capacity) is 1.1-2.8 (Separation of C5-hydrocarbons on microporous materials: complementary performance of MOFs and zeolites[J].J.Am.Chem.Soc.,2010,132,2284-2292)
Ying Yu et al. designed ion-hybrid microporous materials ZU-62 and TIFSIX-2-Cu-i for the separation of isoprene. The material has stable chemical properties and good regeneration performance, but it still has a relatively limited effect on isoprene. Large adsorption capacity (298K, 0.1bar, ZU-6, 0.65mmol / g; TIFSIX-2-Cu-i, 0.73mmol / g), cannot achieve sieving and separation, and the separation selectivity is still not high enough (Remarkable separation of C5 olefins in anion-pillared hybrid porous materials[J].Nano Res.,2020,1-5)
[0006] Therefore, in view of the low selectivity of metal-organic framework materials for the separation of C5 diene systems, it is urgent to develop new separation materials and separation methods to realize the cis / trans-piperylene system, cis-piperylene Efficient and Selective Separation of Three-Component Mixtures of Alkenes, Trans-Piprylene and Isoprene

Method used

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  • A method for separating a mixture of carbon-pentadienes
  • A method for separating a mixture of carbon-pentadienes
  • A method for separating a mixture of carbon-pentadienes

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Embodiment 1

[0072] Mix 2mmol of anhydrous magnesium chloride, 4mmol of gallic acid, 5mmol of potassium hydroxide, and 10mL of deionized water, put them into a 25mL hydrothermal reaction kettle, stir for half an hour, put them in an oven, and react at 120°C for 24 hours. After the reaction, it was naturally cooled to room temperature, and the solid obtained in the reaction was washed with water and ethanol several times in sequence to obtain the purified metal-organic framework material Mg-gallate. The purified adsorbent was vacuum degassed at 120 °C for 24 hours to obtain the desolventized adsorbent, and then the next gas adsorption experiment and breakthrough experiment were performed.

[0073] To test the adsorption-separation performance of the above-synthesized MOFs, single-component adsorption isotherms of trans-piperylene, cis-piperylene, and isoprene were carried out using the above-mentioned adsorbents. The single-component adsorption isotherms of the three gases of this material ...

Embodiment 2

[0076] Mix 2mmol cobalt chloride hexahydrate, 4mmol gallic acid, 1.6mmol potassium hydroxide, and 10mL deionized water, put it into a 25mL hydrothermal reaction kettle, stir for half an hour, put it in an oven, and react at 120°C for 24 hours. After the reaction, it was naturally cooled to room temperature, and the solid obtained in the reaction was washed with water and ethanol several times in sequence to obtain the purified metal organic framework material Co-gallate. The purified adsorbent was vacuum degassed at 120 °C for 24 hours to obtain the desolventized adsorbent, and then the next gas adsorption experiment and breakthrough experiment were performed.

[0077] To test the adsorption-separation performance of the above-synthesized MOFs, single-component adsorption isotherms of trans-piperylene, cis-piperylene, and isoprene were carried out using the above-mentioned adsorbents. The single-component adsorption isotherms of the three gases of this material are shown in ...

Embodiment 3

[0080] 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 half an hour, put them in an oven, and react at 120°C for 24 hours. After the reaction, it was naturally cooled to room temperature, and the solid obtained in the reaction was washed with water and ethanol several times in sequence to obtain the purified metal organic framework material Ni-gallate. The purified adsorbent was vacuum degassed at 120 °C for 24 hours to obtain the desolventized adsorbent, and then the next gas adsorption experiment and breakthrough experiment were performed.

[0081] To test the adsorption-separation performance of the above-synthesized MOFs, single-component adsorption isotherms of trans-piperylene, cis-piperylene, and isoprene were carried out using the above-mentioned adsorbents. The single-component adsorption isotherms of the three gases of this material are shown i...

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Abstract

The present invention relates to a method for separating a mixture of carbon-pentadienes. The method comprises contacting the mixture of carbon-pentadienes with an adsorbent for adsorption separation, wherein the adsorbent includes a metal-organic framework material. The organic ligands in the metal organic framework materials include compounds represented by formula I. Compared with traditional adsorbents, the metal-organic framework material used in the present invention has the advantages of large pore volume, large specific surface area, and adjustable pore structure, and can realize efficient screening and separation of cis / trans-piperylene, while having high capacity and high selectivity. Compared with the traditional extraction and rectification method, the separation method provided by the invention has the advantages of low energy consumption, small equipment investment, and environmental friendliness.

Description

technical field [0001] The invention relates to the field of chemical engineering and technology, in particular to a method for separating a mixture of carbon-pentadienes. Background technique [0002] The by-product carbon five (C5) in the pyrolysis of petroleum hydrocarbons to ethylene, referred to as the cracked C5 fraction, accounts for about 15%-20% of the ethylene production. Cracking C5 fraction, containing more than 30 components with similar boiling points, has high utilization value, and the most abundant ones are isoprene, cyclopentadiene, cis-piperylene and trans-piperylene. The three account for 40%-60% of the cracked C5 fraction. With the continuous increase of the production capacity of liquid hydrocarbons to produce ethylene, the source of cracked C5 is becoming more and more abundant. How to use cracked C5 has become an important aspect of rational utilization of petroleum resources and reduction of ethylene production costs. At present, the utilization of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C7/12C07C7/13C07C11/173B01J20/22B01J20/26
CPCC07C7/12C07C7/13B01J20/226C07B2200/09B01J2220/56B01J2220/58C07C11/173Y02P20/10
Inventor 鲍宗必陈洁
Owner ZHEJIANG UNIV
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