CN112569912A - Flexible metal organic framework material and preparation method and application thereof - Google Patents

Flexible metal organic framework material and preparation method and application thereof Download PDF

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CN112569912A
CN112569912A CN202011411211.6A CN202011411211A CN112569912A CN 112569912 A CN112569912 A CN 112569912A CN 202011411211 A CN202011411211 A CN 202011411211A CN 112569912 A CN112569912 A CN 112569912A
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acetylene
framework material
flexible metal
organic framework
carbon dioxide
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赵学波
杨灵志
闫理停
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China University of Petroleum East China
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/22Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
    • B01J20/223Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material containing metals, e.g. organo-metallic compounds, coordination complexes
    • B01J20/226Coordination polymers, e.g. metal-organic frameworks [MOF], zeolitic imidazolate frameworks [ZIF]
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • CCHEMISTRY; METALLURGY
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    • C01BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B32/00Carbon; Compounds thereof
    • C01B32/50Carbon dioxide
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    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C7/00Purification; Separation; Use of additives
    • C07C7/12Purification; Separation; Use of additives by adsorption, i.e. purification or separation of hydrocarbons with the aid of solids, e.g. with ion-exchangers
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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    • Y02C20/00Capture or disposal of greenhouse gases
    • Y02C20/40Capture or disposal of greenhouse gases of CO2
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00Technologies relating to chemical industry
    • Y02P20/151Reduction of greenhouse gas [GHG] emissions, e.g. CO2

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Abstract

The invention provides a flexible metal organic framework material and a preparation method and application thereof, wherein the expression of the flexible metal organic framework material is [ M-L1-L2] n, wherein n is a positive integer, and the flexible metal organic framework material is constructed by metal ions M, organic ligands L1 and organic ligands L2 through coordination bonds. The method is used for separating the mixed gas of acetylene and carbon dioxide. The flexible metal organic framework material provided by the invention has a very high ratio of the adsorption amount of acetylene to carbon dioxide, and also has very high adsorption selectivity, easily obtained raw materials, low cost, energy conservation and high efficiency.

Description

Flexible metal organic framework material and preparation method and application thereof
Technical Field
The invention belongs to the technical field of acetylene preparation, and particularly relates to a flexible metal organic framework material and a preparation method and application thereof.
Background
Acetylene is a very important organic chemical basic raw material and can be used for producing synthetic rubber, synthetic fiber, acrylic acid derivatives, vinyl compounds and acetylene alcohol. Meanwhile, acetylene is widely used in the fields of metal welding, cutting, electronic industry and the like. At present, the methods for industrially producing acetylene mainly comprise a calcium carbide method, a natural gas partial oxidation method, a petroleum hydrocarbon thermal cracking method and the like. In these acetylene production processes, small amounts of impurities such as carbon dioxide are typically produced.
At present, acetylene is separated and purified mainly by a solvent absorption method and an adsorption separation method in industry, wherein the solvent absorption method has high energy consumption, large investment and complex process and is generally accompanied with certain environmental pollution. Due to the boiling points of acetylene and carbon dioxide (the boiling point of acetylene is 189.3K, the boiling point of carbon dioxide is 194.7K) and the molecular size (the molecular size of acetylene is
Figure BDA0002816339210000013
Carbon dioxide having a molecular size of
Figure BDA0002816339210000012
) Very similar and at the same time have the same dynamic size
Figure BDA0002816339210000011
The traditional porous material has the defects of small difference of adsorption amount, low adsorption selectivity and the like, and is difficult to effectively separate the mixture of acetylene and carbon dioxide. For example, the ratio of the adsorption quantity of acetylene/carbon dioxide at 270K and 1bar of a flexible porous material CPL-1(Nature,2005,436(7048): 238-; the selectivity of the metal-organic framework material FJU-88a (J.Am.chem.Soc.,2019,141(9):4130-4136) for acetylene/carbon dioxide is only 4.3. Therefore, the development of the high-stability porous material with high acetylene/carbon dioxide adsorption capacity ratio and high selectivity has very important significance.
Disclosure of Invention
Aiming at the defects of the prior separation technology, the invention provides a novel method for efficiently screening acetylene carbon dioxide and preparation of an adsorbent material QLUT-1 thereof, which realizes selective recognition and adsorption of acetylene, hardly adsorbs carbon dioxide and can obtain high-purity acetylene (99.9%).
The specific technical scheme is as follows:
the flexible metal organic framework material is expressed as [ M-L1-L2] n, wherein n is a positive integer and is constructed by metal ions M, organic ligands L1 and organic ligands L2 through coordination bonds.
Wherein the metal ion is Cu2+(ii) a The organic ligand L1 is 2-aminopyrazine; the organic ligand L2 is pyrazine-2, 3-dicarboxylic acid.
The preparation method of the flexible metal organic framework material comprises the following steps:
(1) mixing a deionized water solution containing metal ions M, organic ligands L2 and NaOH with a deionized water solution containing organic ligands L1, and then reacting at 80-120 ℃ or stirring at normal temperature to obtain blue powder;
(2) exchanging the blue powder obtained in the step (1) in methanol for multiple times by adopting a solvent exchange method, then placing the blue powder at room temperature for 1 day, and finally reaching 10 in a vacuum state-7mbar and constant, thereby obtaining a flexible metal organic framework material for sieving acetylene carbon dioxide.
Preferably, the mass ratio of the metal ion M, the organic ligand L1, the organic ligand L2 and the NaOH is 1:12:1: 1.5-3.
The volume ratio of the deionized water solution containing the metal ions M, the organic ligands L1 and NaOH to the deionized water solution containing the organic ligands L2 is 1:1.
the flexible metal organic framework material is applied to separation of acetylene and carbon dioxide mixed gas.
The acetylene and carbon dioxide mixed gas separation method is characterized in that acetylene and carbon dioxide mixed gas is contacted with the flexible metal organic framework material according to claim 1 or 2, acetylene molecules are selectively adsorbed, and acetylene and carbon dioxide are separated.
The flexible metal organic framework material QLUT-1 provided by the invention has a very high ratio of the adsorption capacity of acetylene to carbon dioxide, and also has very high adsorption selectivity, easily available raw materials, low cost, energy conservation and high efficiency.
QLUT-1 has extremely high acetylene/carbon dioxide selectivity, the adsorption capacity ratio at normal temperature and pressure is 8.6, and the acetylene/carbon dioxide selectivity calculated by the ideal adsorption solution theory is 119. Penetration experiments show that the material can effectively separate acetylene and carbon dioxide and can obtain acetylene with purity higher than 99%. The method can enrich acetylene in the acetylene and carbon dioxide mixed gas to obtain acetylene with the purity of more than 99 percent, and has the advantages of good repeatability, low cost and simple operation.
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FIG. 1a is a schematic diagram of the structure and channel of the metal-organic framework material QLUT-1 obtained in the example;
FIG. 1b is a second schematic diagram of the structure and channel of the metal-organic framework material QLUT-1 obtained in the example;
FIG. 2 is an X-ray diffraction (XRD) pattern of the chemical stability of the metal-organic framework material QLUT-1 obtained in the example;
FIG. 3 is a graph showing single-component adsorption curves of acetylene and carbon dioxide at 25 ℃ of the metal-organic framework material QLUT-1 obtained in the example;
FIG. 4 is a graph showing the adsorption amount ratio of acetylene to carbon dioxide at 25 ℃ of the metal-organic framework material QLUT-1 obtained in the example;
FIG. 5 is a diagram of the selectivity of the metal organic framework material QLUT-1 obtained in the example, theoretically calculated from the ideal adsorption solution at 25 ℃;
FIG. 6 is a graph of a breakthrough experiment of the metal-organic framework material QLUT-1 obtained in the example at 25 ℃ for acetylene and carbon dioxide;
FIG. 7 is a graph of cycle stability of breakthrough experiment of acetylene and carbon dioxide at 25 ℃ for the metal organic framework material QLUT-1 obtained in the example.
Detailed Description
The specific technical scheme of the invention is described by combining the embodiment.
The preparation method of the flexible metal organic framework material comprises the following steps:
(1) will contain metal ions Cu2+Mixing the deionized water solution of pyrazine-2, 3-dicarboxylic acid and NaOH with the deionized water solution containing organic ligand 2-aminopyrazine, and stirring for reaction to obtain blue powder;
(2) exchanging the blue powder obtained in the step (1) in methanol for multiple times by adopting a solvent exchange method, then placing the blue powder at room temperature for 1 day, and finally reaching 10 in a vacuum state-7mbar and constant, thereby obtaining a flexible metal organic framework material for sieving acetylene carbon dioxide.
The metal ion Cu2+The mass ratio of the organic ligand 2-aminopyrazine, the organic ligand pyrazine-2, 3-dicarboxylic acid and NaOH is 1:12:1: 1.5-3.
The volume ratio of the deionized water solution containing the metal ions M, the organic ligand 2-aminopyrazine and NaOH to the deionized water solution containing the organic ligand pyrazine-2, 3-dicarboxylic acid is 1:1.
as shown in fig. 1a and fig. 1b, the obtained flexible metal organic framework material QLUT-1 has a "gourd-shaped" one-dimensional flexible pore channel, which is subjected to shrinkage deformation after the solvent molecules in the pore channel are removed and activated. Because the surface of the pore channel is distributed with high-density unsaturated oxygen atoms and amino functional groups, the material has stronger interaction force on acetylene molecules with strong hydrogen bond acidity, can selectively adsorb the acetylene molecules and prevent carbon dioxide molecules from entering, has the advantages of high ratio of acetylene/carbon dioxide adsorption capacity and high selectivity, and can obtain high-purity acetylene gas.
As can be seen from fig. 2, the material shows little change in structure after soaking in water for one week and standing in air for one month. In addition, the material has good stability against acid gas, and the structure is basically unchanged after sulfur dioxide is adsorbed.
As can be seen from FIG. 3, the carbon dioxide adsorbed by the activated QLUT-1 at normal temperature and pressure is negligible, while the acetylene molecule is selectively adsorbed to 1.84mmol g-1And exhibits an extremely high adsorption capacity at low pressure, and at 0.05bar, the adsorption capacity of acetylene is as high as 1.4mmol g-1. The gas adsorption capacity ratio of acetylene to carbon dioxide is 8.6 at normal temperature and normal pressureAs shown in fig. 4.
As shown in fig. 5, the acetylene/carbon dioxide selectivity calculated by the ideal adsorption solution theory was 119.
The activated QLUT-1 is loaded into an adsorption column with an inner diameter of 4mm, and acetylene: a mixed gas of carbon dioxide (50: 50) is introduced into the bed layer of the adsorption column at a flow rate of 2mL/min to carry out a fixed bed breakthrough experiment. As shown in fig. 6, carbon dioxide first penetrated the bed and acetylene gas was enriched in the adsorption column bed until after 28 min. The experiment shows that the material can effectively separate the mixed gas of acetylene and carbon dioxide and can obtain acetylene with the purity higher than 99 percent, as shown in figure 7.
The material also has excellent cycling stability, and still keeps good acetylene and carbon dioxide separation performance after 8 cycles.

Claims (7)

1. The flexible metal organic framework material is characterized by having an expression of [ M-L1-L2] n, wherein n is a positive integer and is constructed by metal ions M, organic ligands L1 and organic ligands L2 through coordination bonds.
2. The flexible metal organic framework material of claim 1, wherein the metal ion is Cu2+(ii) a The organic ligand L1 is 2-aminopyrazine; the organic ligand L2 is pyrazine-2, 3-dicarboxylic acid.
3. The preparation method of the flexible metal organic framework material is characterized by comprising the following steps:
(1) mixing a deionized water solution containing metal ions M, organic ligands L2 and NaOH with a deionized water solution containing organic ligands L1, and stirring for reaction to obtain blue powder;
(2) exchanging the blue powder obtained in the step (1) in methanol for multiple times by adopting a solvent exchange method, then placing the blue powder at room temperature for 1 day, and finally reaching 10 in a vacuum state-7mbar and constant, thereby obtaining a flexible metal organic framework material for sieving acetylene carbon dioxide.
4. The method for preparing the flexible metal organic framework material according to claim 3, wherein the mass ratio of the metal ions M, the organic ligands L1, the organic ligands L2 and NaOH is 1:12:1: 1.5-3.
5. The method for preparing a flexible metal organic framework material according to claim 4, wherein the volume ratio of the deionized water solution containing the metal ions M, the organic ligands L1 and NaOH to the deionized water solution containing the organic ligands L2 is 1:1.
6. use of the flexible metal organic framework material according to claim 1 for acetylene, carbon dioxide mixed gas separation.
7. The method for separating the acetylene and carbon dioxide mixed gas is characterized in that the acetylene and carbon dioxide mixed gas is contacted with the flexible metal organic framework material as claimed in claim 1 or 2 to selectively adsorb acetylene molecules and separate the acetylene from the carbon dioxide.
CN202011411211.6A 2020-12-04 2020-12-04 Flexible metal organic framework material and preparation method and application thereof Pending CN112569912A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113278159A (en) * 2021-05-26 2021-08-20 江西师范大学 Iron-nickel metal organic framework material for separating acetylene/carbon dioxide mixed gas and preparation method thereof
CN114367270A (en) * 2021-11-30 2022-04-19 浙江大学 Method for separating acetylene and carbon dioxide

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4961867A (en) * 1985-10-15 1990-10-09 The Dow Chemical Company Process for preventing corrosion of metals by contacting them with compositions prepared from amino substituted pyrazines and carboxylic acids carboxylic acid anhydrides, carboxylic acid, esters or carboxylic acid halides
GB9504854D0 (en) * 1994-03-31 1995-04-26 Zeneca Ltd Nitrogen derivatives
CN108671893A (en) * 2018-04-24 2018-10-19 浙江大学 A kind of separation method for detaching the metal-organic framework material and ethylene acetylene of ethylene and acetylene
CN110483794A (en) * 2019-08-20 2019-11-22 南昌大学 A kind of metal-organic framework material and its preparation method and application

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4961867A (en) * 1985-10-15 1990-10-09 The Dow Chemical Company Process for preventing corrosion of metals by contacting them with compositions prepared from amino substituted pyrazines and carboxylic acids carboxylic acid anhydrides, carboxylic acid, esters or carboxylic acid halides
GB9504854D0 (en) * 1994-03-31 1995-04-26 Zeneca Ltd Nitrogen derivatives
CN108671893A (en) * 2018-04-24 2018-10-19 浙江大学 A kind of separation method for detaching the metal-organic framework material and ethylene acetylene of ethylene and acetylene
CN110483794A (en) * 2019-08-20 2019-11-22 南昌大学 A kind of metal-organic framework material and its preparation method and application

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
LINGZHI YANG.ETAL: "Adsorption Site Selective Occupation Strategy within a Metal–Organic Framework for Highly Efficient Sieving Acetylene from Carbon Dioxide", 《GAS SEPRATION》 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113278159A (en) * 2021-05-26 2021-08-20 江西师范大学 Iron-nickel metal organic framework material for separating acetylene/carbon dioxide mixed gas and preparation method thereof
CN114367270A (en) * 2021-11-30 2022-04-19 浙江大学 Method for separating acetylene and carbon dioxide

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