CN110639474B - Adsorbent for separating propylene and propane and preparation method thereof - Google Patents

Adsorbent for separating propylene and propane and preparation method thereof Download PDF

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CN110639474B
CN110639474B CN201910928218.6A CN201910928218A CN110639474B CN 110639474 B CN110639474 B CN 110639474B CN 201910928218 A CN201910928218 A CN 201910928218A CN 110639474 B CN110639474 B CN 110639474B
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adsorbent
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李忠
孙艺薇
周欣
夏启斌
肖静
吴玉芳
唐瑜佞
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South China University of Technology SCUT
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Abstract

The invention discloses an adsorbent for separating propylene and propane and a preparation method thereof. The method comprises the following steps: adding ZnO into water, mixing uniformly, adding N, N-dimethylformamide, and mixing uniformly to obtain a ZnO nano-slurry solution; adding Cu (NO)3)2·3H2Adding O into the ZnO nano-slurry solution, and uniformly mixing to obtain mixed nano-slurry; adding an organic small molecule modification reagent and trimesic acid into ethanol, and uniformly mixing to obtain a mixed solution; and adding the mixed nano slurry into the mixed solution, uniformly mixing, standing for synthesis reaction, filtering, heating the precipitate in vacuum for activation treatment, and obtaining the adsorbent for separating propylene and propane. Due to the introduction of pyrrole or urazole, the adsorbent obtained by the invention can enhance the pair C of the adsorbent3H6Adsorption of (2), increase of C3H6the/C3H 8 also enhances the moisture stability of the material, at C3H6/C3H8Has good application prospect in the aspect of adsorption separation.

Description

Adsorbent for separating propylene and propane and preparation method thereof
Technical Field
The invention belongs to the technical field of adsorption materials, and particularly relates to an adsorbent for separating propylene and propane and a preparation method thereof.
Background
Propylene, which is second only to ethylene, is a key raw material for many fossil products and an important component for the manufacture of various chemicals such as polypropylene and acrylonitrile. According to statistics, the global propylene consumption reaches 9600 million tons in 2015, and reaches 1.2 million tons in 2020. Generally, propylene is produced from fossil fuel cracking or refinery dry gas at high temperatures, which contains less absorbed propane. In order to obtain propylene of high purity, it is necessary to separate propylene and propane. The major separation method at present is cryogenic distillation. Due to the close boiling points of propylene (47.6 deg.C) and propane (42.2 deg.C), the separation and purification process is very capital and energy intensive. Therefore, there is a need to develop an economical and efficient separation method. In recent years, physical adsorption separation has attracted much attention. The core for adsorbing and separating is adsorbent, and common porous adsorbent is zeolite, and active carbon and emerging porous materials such as metal organic framework Materials (MOFs) and the like. Among them, metal organic framework Materials (MOFs) are one of the most promising adsorbents. Their high specific surface area, tunable porosity and multiple topologies make them promising materials for many applications. Bachman et al developed a new technique called Fe2(m-dobdc) MOFs, and C is reported3H6And C3H8The absorptions were 7.61mmol/g and 6.27mmol/g (Bachman, J.E., et al, M2(M-dobdc) (M ═ Mn, Fe, Co, Ni) Metal-Organic Frameworks as High hlly selected, High-Capacity Adsorbents for oxygen/Parafin separations. J.Am Chem Soc,2017.139(43): p.15363-15370.). Kim et al supported Cu (I) on MIL-100(Fe) to obtain Cu (0.6) @ MIL-100(Fe) having a propylene/propane selectivity at 323K of 13.2 and an adsorption capacity of 1.47mmol/g (Kim, A. -R., et al, furniture loading of Cu (I) in MIL-100(Fe) through redox-active Fe (II) sites and recordable propylene/propane separation performance. chemical Engineering Journal, 2018.331: p.777-784.). Wang et al studied the separation performance of a flexible porous MOF named NJU-Bai8 and reported that its absorption of propylene and propane approaches about 60cm3(g) IAST selectivity of NJU-Bai8 at 298K and 20K due to gate opening effectpa reaches 4.6(Wang, H., et al, One-of-a-done: a microbial metal-organic frame pad of adsorbed separation of line, mono-and di-branched olefin isomerous from a viral temperature-and adsorbed-dependent molecular orientation. energy. in&Environmental Science,2018. 11(5):p.1226-1231.)。
Figure BDA0002219490770000021
Wait to synthesize two MOFs, Mg2(dhtp) and Co2(dhtp) (Bohme, U.S., et al, ethane/ethane and pro pen/pan separation via the olyfin and parafin selective metal-organic frame absorbers CPO-27 and ZIF-8. Langmuir,2013.29(27): p.8592-600.). As a result, it was found that Mg2C of (dhtp)3H6And C3H8The absorptions reached 7.50 and 6.21mmol/g, respectively, while Co2C of (dhtp)3H6And C3H8The absorptions reached 4.88 and 3.55mmol/g, respectively. However, both materials tend to collapse in the presence of moisture. Plaza et al evaluated Cu-BTC pellets in pellet form from Pasteur, and used a fixed bed experiment to separate propylene from Propane with a Propane/propylene separation factor of 2-3(Plaza, M.G., et al, Propane/propylene separation by adsorption using a shaped copperplate ternary MOF. Microporous and MeOporous Materials,2012.157: p.101-111.). At present most MOFs, e.g. Mg2(dhtp)，Cu-BTC， Fe2(m-dobdc) and Mg-MOF-74, etc., which have unstable structures, especially poor water vapor stability, greatly limit their practical applications.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide an adsorbent for separating propylene and propane and a preparation method thereof.
The purpose of the invention is realized by at least one of the following technical solutions.
The invention aims to solve the problem that most of the existing MOFs are C3H6/C3H8The selectivity of separation is not high enough or the problem of unstable and stable water vapor exists, and a method for preparing the high-C-content carbon nano-material with high C content is provided3H6/C3H8A method for preparing pyrrole @ Cu-BTC and urazole @ Cu-BTC composite adsorbent with selectivity and good water vapor stability.
The invention provides an adsorbent for separating propylene and propane and a preparation method thereof. The method mainly comprises the following steps: dissolving ZnO in deionized water and N, N-Dimethylformamide (DMF) to obtain ZnO nano-slurry solution; adding Cu (NO)3)2·3H2Dissolving O in ZnO nano-slurry solution to obtain Cu (NO)3)2And ZnO nano-slurry solution mixed liquor; dissolving trimesic acid and pyrrole (or urazole) in ethanol to obtain a mixed solution of trimesic acid and pyrrole (or urazole); adding Cu (NO)3)2And adding the mixed solution of the ZnO nano-size solution and the mixed solution of pyrrole trimesate (or urazole) for standing reaction for 10-15min, and filtering, drying and vacuum activating a reaction product to obtain a product (the adsorbent for separating propylene and propane).
The pyrrole @ Cu-BTC and urazole @ Cu-BTC composite adsorbent obtained by the invention has the following important characteristics: the introduction of pyrrole or urazole can enhance the pair C of the adsorbent3H6Adsorption of (2), increase of C3H6the/C3H 8 also enhances the moisture stability of the material, at C3H6/C3H8Has good application prospect in the aspect of adsorption separation.
The invention provides a preparation method of an adsorbent for separating propylene and propane, which comprises the following steps:
(1) adding ZnO into deionized water, performing ultrasonic dispersion uniformly, adding N, N-Dimethylformamide (DMF), and mixing uniformly to obtain a ZnO nano-slurry solution; adding Cu (NO)3)2·3H2Adding O into the ZnO nano-slurry solution, and uniformly mixing to obtain mixed nano-slurry (Cu (NO)3)2And ZnO nanopaste solution mixed liquor);
(2) adding an organic small molecule modification reagent and trimesic acid into absolute ethyl alcohol, and uniformly mixing to obtain a mixed solution;
(3) and (3) adding the mixed nano slurry obtained in the step (1) into the mixed solution obtained in the step (2), uniformly mixing, standing for synthetic reaction, filtering to obtain a precipitate (blue solid powder), and heating the precipitate in vacuum for activation treatment to obtain the adsorbent for separating propylene and propane.
Further, the ZnO and Cu (NO) in the step (1)3)2·3H2The molar ratio of O is 1:2-1: 1.25.
Further, the volume ratio of the water to the N, N-Dimethylformamide (DMF) in the step (1) is (1-1.1) to (1-1.2).
Further, the ratio of the molar absorption to the water volume of the ZnO in the step (1) is 0.225-0.36: 1 mol/L.
Further, the organic small molecule modification reagent in the step (2) is more than one of pyrrole and urazole; the mol ratio of the organic small molecule modification reagent to trimesic acid is 0.45-2.025: 1.
When pyrrole is selected as the organic small molecule modification reagent in the step (2), the adsorbent for separating propylene and propane prepared in the step (3) is pyrrole @ Cu-BTC composite adsorbent material, wherein @ represents the composite meaning of pyrrole and Cu-BTC; BTC is represented by trimesic acid (benzene-1,3,5-tricarboxylic acid), Cu is represented by copper ions, and Cu-BTC is a metal organic framework material formed by compounding the copper ions and the trimesic acid.
When the organic micromolecule modification reagent in the step (2) is urazole, the adsorbent for separating propylene and propane prepared in the step (3) is a urazole @ Cu-BTC composite adsorbent material, wherein @ represents the composite meaning of the urazole and Cu-BTC; BTC is represented by trimesic acid (benzene-1,3,5-tricarboxylic acid), Cu is represented by copper ions, and Cu-BTC is a metal organic framework material formed by compounding the copper ions and the trimesic acid.
Further, the volume ratio of the N, N-dimethylformamide in the step (1) to the ethanol in the step (2) is (1-1.2) to (1-1.3); cu (NO) described in step (1)3)2·3H2The molar ratio of O to the small organic molecule modifying reagent in the step (2) is 1:0.2-1: 0.9.
Further, the molar absorption to ethanol volume ratio of trimesic acid in step (2) is 0.152-0.2: 1 mol/L.
Further, the time of the synthesis reaction in the step (3) is 10-15 min.
Further, the temperature of the activation treatment in the step (3) is 120-150 ℃, and the time of the activation treatment is 8-16 h.
Preferably, the filtration in step (3) can be performed by using an organic filter membrane.
The invention provides an adsorbent for separating propylene and propane, which is prepared by the preparation method.
The preparation method provided by the invention prepares the pyrrole @ Cu-BTC or urazole @ Cu-BTC composite adsorbent by introducing pyrrole or urazole, has stronger propylene propane adsorption selectivity and higher water vapor stability, and enables the adsorbent to separate C in an adsorption manner3H6/C3H8Has good application prospect in separation.
Compared with the prior art, the invention has the following advantages and effects:
the preparation method provided by the invention is simple to operate, easy to realize and good in repeatability; the synthesis reaction can be carried out at normal temperature, the reaction time is short, and the synthesis reaction only needs 10-15 min; more importantly, the method is separated from the existing adsorption C3H6/C3H8Compared with the material, the pyrrole @ Cu-BTC composite adsorbent and the urazole @ Cu-BTC composite adsorbent prepared by the invention have C3H6/C3H8The adsorption selectivity and the excellent water vapor stability of the composite material are achieved; c of Cu-BTC3H6/C3H8IAST of up to 5.65, and C of pyrrole @ Cu-BTC3H6/C3H8IAST selectivity reaches 8.33; c of urazole @ Cu-BTC3H6/C3H8The IAST adsorption selectivity reaches 5.98 at most.
Drawings
FIG. 1 shows N of the adsorbents prepared in the respective examples for separating propylene and propane2Adsorption and desorption isotherms;
FIG. 2 is an XRD spectrum of the adsorbent for separating propylene and propane prepared in each example;
FIG. 3a is an SEM image of a Cu-BTC adsorbent material prepared by a comparative example;
FIG. 3b is an SEM image of the adsorbent for separating propylene and propane prepared in example 1;
FIG. 3c is an SEM image of the adsorbent for separating propylene and propane prepared in example 2;
FIG. 3d is an SEM image of the adsorbent prepared in example 3 for separating propylene and propane;
FIG. 3e is an SEM image of the adsorbent prepared in example 4 for separating propylene and propane;
FIG. 4C of adsorbents prepared in various examples for separating propylene and propane3H6/C3H8An adsorption isotherm diagram;
FIG. 5 shows a pair C of the adsorbents obtained in examples 1 and 3 and the material obtained in comparative example, which were calculated by the IAST method3H6/C3H8A graph of adsorption selectivity results of;
fig. 6a is an XRD pattern of Cu-BTC prepared in comparative example after 20 days of standing at RH 55%;
fig. 6b is an XRD pattern of the adsorbent for separating propylene and propane prepared in example 1 after being left at RH 55% for 20 days.
Detailed Description
The following examples are presented to further illustrate the practice of the invention, but the practice and protection of the invention is not limited thereto. It is noted that the processes described below, if not specifically described in detail, are all realizable or understandable by those skilled in the art with reference to the prior art. The reagents or apparatus used are not indicated to the manufacturer, and are considered to be conventional products available by commercial purchase.
Example 1
A method for preparing an adsorbent for separating propylene and propane, comprising the steps of:
(1) adding ZnO (3.6mmol) into deionized water (16ml in volume), ultrasonically dispersing for 10min, and adding N, N-dimethylformamide (DMF 16m in volume)l), uniformly mixing to obtain a ZnO nano slurry solution; adding Cu (NO)3)2·3H2Adding O (7.2mmol) into the ZnO nano-slurry solution, and uniformly mixing to obtain mixed nano-slurry; the volume ratio of the deionized water to the N, N-dimethylformamide is 1: 1; the ZnO and Cu (NO)3)2·3H2The molar ratio of O is 1: 2;
(2) adding an organic small molecule modification reagent (pyrrole is selected in example 1, the absorption is 1.44mmol) and trimesic acid (3.2mmol) into absolute ethyl alcohol (16ml), and uniformly mixing to obtain a mixed solution;
(3) adding the mixed nano slurry obtained in the step (1) into the mixed solution obtained in the step (2), uniformly mixing, standing for a synthesis reaction, wherein the synthesis reaction time is 10min, filtering with an organic filter membrane to obtain a precipitate, heating the precipitate in vacuum for activation treatment, wherein the activation treatment temperature is 150 ℃, and the activation treatment time is 6 hours, so as to obtain the adsorbent (pyrrole @ Cu-BTC composite adsorbent material) for separating propylene and propane. The adsorbent for separating propylene and propane obtained in example 1 was designated as Pyr0.2@ Cu-BTC material.
Example 2
A method for preparing an adsorbent for separating propylene and propane, comprising the steps of:
(1) adding ZnO (5.76mmol) into deionized water (16ml in volume), performing ultrasonic dispersion uniformly for 10min, adding N, N-dimethylformamide (DMF (19 ml in volume), and mixing uniformly to obtain ZnO nano-slurry solution; adding Cu (NO)3)2·3H2Adding O (7.2mmol) into the ZnO nano-slurry solution, and uniformly mixing to obtain mixed nano-slurry; the volume ratio of the deionized water to the N, N-dimethylformamide is 16: 19; the ZnO and Cu (NO)3)2·3H2The molar ratio of O is 1: 1.25;
(2) adding an organic small molecule modification reagent (pyrrole is selected in example 2, the absorption is 6.48mmol) and trimesic acid (3.2mmol) into absolute ethyl alcohol (16ml), and uniformly mixing to obtain a mixed solution;
(3) adding the mixed nano-slurry obtained in the step (1)And (3) uniformly mixing the mixed solution in the step (2), standing for synthetic reaction, filtering the mixed solution by using an organic filter membrane for 15min, taking a precipitate, heating the precipitate in vacuum for activation treatment at the temperature of 150 ℃ for 6 hours, and thus obtaining the adsorbent (pyrrole @ Cu-BTC composite adsorbent material) for separating propylene and propane. The adsorbent for separating propylene and propane obtained in example 2 was designated as Pyr0.9@ Cu-BTC material.
Example 3
A method for preparing an adsorbent for separating propylene and propane, comprising the steps of:
(1) adding ZnO (3.6mmol) into deionized water (16ml in volume), performing ultrasonic dispersion uniformly for 10min, adding N, N-dimethylformamide (DMF (16ml in volume), and mixing uniformly to obtain ZnO nano-slurry solution; adding Cu (NO)3)2·3H2Adding O (7.2mmol) into the ZnO nano-slurry solution, and uniformly mixing to obtain mixed nano-slurry; the volume ratio of the deionized water to the N, N-dimethylformamide is 1: 1; the ZnO and Cu (NO)3)2·3H2The molar ratio of O is 1: 1.25;
(2) adding an organic small molecule modification reagent (1.44 mmol of urazole used in example 3) and trimesic acid (3.2mmol) into absolute ethyl alcohol (21ml), and uniformly mixing to obtain a mixed solution;
(3) adding the mixed nano slurry obtained in the step (1) into the mixed solution obtained in the step (2), uniformly mixing, standing for a synthesis reaction, wherein the synthesis reaction time is 10min, filtering with an organic filter membrane to obtain a precipitate, heating the precipitate in vacuum for activation treatment, wherein the activation treatment temperature is 150 ℃, and the activation treatment time is 6 hours, so as to obtain the adsorbent (pyrrole @ Cu-BTC composite adsorbent material) for separating propylene and propane. The adsorbent prepared in example 3 for separating propylene and propane is designated Ura0.2@ Cu-BTC material.
Example 4
A method for preparing an adsorbent for separating propylene and propane, comprising the steps of:
(1) adding ZnO (5.76mmol) into deionized water (16ml in volume), performing ultrasonic dispersion uniformly for 10min, adding N, N-dimethylformamide (DMF (19 ml in volume), and mixing uniformly to obtain ZnO nano-slurry solution; adding Cu (NO)3)2·3H2Adding O (7.2mmol) into the ZnO nano-slurry solution, and uniformly mixing to obtain mixed nano-slurry; the volume ratio of the deionized water to the N, N-dimethylformamide is 16: 19; the ZnO and Cu (NO)3)2·3H2The molar ratio of O is 1: 1.25;
(2) adding an organic small molecule modification reagent (urazole is selected in example 4, the absorption is 6.48mmol) and trimesic acid (3.2mmol) into absolute ethyl alcohol (16ml), and uniformly mixing to obtain a mixed solution;
(3) adding the mixed nano slurry obtained in the step (1) into the mixed solution obtained in the step (2), uniformly mixing, standing for a synthesis reaction, wherein the synthesis reaction time is 10min, filtering with an organic filter membrane to obtain a precipitate, heating the precipitate in vacuum for activation treatment, wherein the activation treatment temperature is 150 ℃, and the activation treatment time is 6 hours, so as to obtain the adsorbent (pyrrole @ Cu-BTC composite adsorbent material) for separating propylene and propane. The adsorbent prepared in example 4 for separating propylene and propane is designated Ura0.9@ Cu-BTC material.
Comparative example
A preparation method of a Cu-BTC adsorbing material comprises the following steps:
(1) adding ZnO (5.76mmol) into deionized water (16ml in volume), performing ultrasonic dispersion uniformly for 10min, adding N, N-dimethylformamide (DMF (16ml in volume), and mixing uniformly to obtain ZnO nano-slurry solution; adding Cu (NO)3)2·3H2Adding O (7.2mmol) into the ZnO nano-slurry solution, and uniformly mixing to obtain mixed nano-slurry;
(2) filtering the mixed nano slurry obtained in the step (1) by using an organic filter membrane to obtain a precipitate, and then heating the precipitate in vacuum to perform activation treatment, wherein the temperature of the activation treatment is 150 ℃, and the time of the activation treatment is 6 hours, so as to obtain the Cu-BTC adsorbing material. The Cu-BTC adsorbent material prepared in the comparative example was labeled as Cu-BTC.
Effect verification
The pore structure of the adsorbents for separating propylene and propane (pyrrole @ Cu-BTC composite adsorbent material and urazole @ Cu-BTC composite adsorbent material) prepared in examples was characterized by using an ASAP2460 specific surface pore size distribution instrument manufactured by Micromeritics, usa, and the results are shown in fig. 1 and table 1 below. Table 1 shows the parameters of specific surface area (BET) and pore structure of the adsorbents prepared in the respective examples for separating propylene and propane. The parameters of pore structure are expressed in terms of total pore volume in cm3(ii) in terms of/g. FIG. 1 is a diagram showing N of adsorbents (pyrrole @ Cu-BTC composite adsorbent material and urazole @ Cu-BTC composite adsorbent material) for separating propylene and propane prepared in examples2Adsorption and desorption isotherm diagram; wherein all the materials prepared in the examples and Cu-BTC were tested for their N under 77K conditions2And (4) performing adsorption and desorption isotherms, and then calculating the specific surface area and the total pore volume of the material according to the N2 adsorption and desorption isotherms.
TABLE 1
Figure BDA0002219490770000101
In conjunction with FIG. 1 and Table 1, it can be found that the BET specific surface area of the adsorbents for separating propylene and propane (pyrrole @ Cu-BTC composite adsorbent material and urazole @ Cu-BTC composite adsorbent material) prepared in examples ranges from 1398.60 to 1581.85m2(ii) a total pore volume in the range of 0.55 to 0.67cm3(ii) in terms of/g. This shows that the materials prepared in the examples all have higher specific surface area and larger pore volume.
Fig. 2 is an XRD pattern of the adsorbents for separating propylene and propane (pyrrole @ Cu-BTC composite adsorbent material and urazole @ Cu-BTC composite adsorbent material) prepared in examples, and as seen from fig. 2, the adsorbents for separating propylene and propane prepared in all examples exhibited three characteristic diffraction peaks at 2 θ ═ 6.8 °, 9.6 ° and 11.8 °, indicating that the pyrrole @ Cu-BTC and urazole @ Cu-BTC prepared in examples had good crystal structures.
FIG. 3a is an SEM image of a Cu-BTC adsorbent material prepared by a comparative example; FIG. 3b is an SEM image of the adsorbent for separating propylene and propane prepared in example 1; FIG. 3c is an SEM image of the adsorbent for separating propylene and propane prepared in example 2; FIG. 3d is an SEM image of the adsorbent prepared in example 3 for separating propylene and propane; FIG. 3e is an SEM image of the adsorbent prepared in example 4 for separating propylene and propane; it can be seen from fig. 3a, 3b, 3c, 3d and 3e that these materials all have a regular octahedral structure.
FIG. 4 is C at 298K of the adsorbents for separating propylene and propane prepared in all the examples3H6/C3H8Adsorption isotherm plot. As can be seen from FIG. 4, the materials produced in the examples (the adsorbent for separating propylene and propane) are shown to have a C-to-C ratio as compared with the original Cu-BTC (Cu-BTC adsorbent material produced in the comparative example)3H6/C3H8The adsorption capacity of (a) is higher.
FIG. 5 shows the IAST values of example 1, example 3 and comparative example pair C3H6/C3H8As a result of the adsorption selectivity, it can be seen that the material prepared in example 1 (the adsorbent for separating propylene and propane) has a higher C than the original Cu-BTC (the Cu-BTC adsorbent material prepared in comparative example)3H6/C3H8And (4) adsorption selectivity.
Fig. 6a is an XRD pattern of Cu-BTC prepared in comparative example after 20 days of standing at RH 55%; fig. 6b is an XRD pattern of the adsorbent for separating propylene and propane prepared in example 1 after being left at RH 55% for 20 days. As can be seen from fig. 6a and 6b, XRD characteristic peaks of ordinary Cu-BTC (Cu-BTC adsorbent material prepared by comparative example) have substantially disappeared after being left for 20 days, indicating that the structure of Cu-BTC has collapsed; the Pyr @ Cu-BTC material prepared in example 1 is kept unchanged after being placed for 20 days, which shows that the material still has a good crystal structure, and the material is proved to have good water vapor stability. The adsorbents for separating propylene and propane prepared in the other examples also have good moisture stability, as also shown in fig. 6 a.
The above examples are only preferred embodiments of the present invention, which are intended to be illustrative and not limiting, and those skilled in the art should understand that they can make various changes, substitutions and alterations without departing from the spirit and scope of the invention.

Claims (2)

1. A method for preparing an adsorbent for separating propylene and propane, which is characterized by comprising the following steps:
(1) adding ZnO into water, ultrasonically dispersing uniformly, then adding N, N-dimethylformamide, and mixing uniformly to obtain a ZnO nano-slurry solution; adding Cu (NO)3)2 ·3H2Adding O into the ZnO nano-slurry solution, and uniformly mixing to obtain mixed nano-slurry; the ZnO and Cu (NO)3)2 ·3H2The molar ratio of O is 1:2-1: 1.25; the volume ratio of the water to the N, N-dimethylformamide is (1-1.1) to (1-1.2); the ratio of the molar weight of ZnO to the volume of water is 0.225-0.36: 1 mol/L;
(2) adding an organic small molecule modification reagent and trimesic acid into ethanol, wherein the organic small molecule modification reagent is urazole; the mol ratio of the organic small molecule modification reagent to trimesic acid is 0.45-2.025:1, uniformly mixing to obtain a mixed solution; the ratio of the molar weight of the trimesic acid to the volume of the ethanol is 0.152-0.2: 1 mol/L;
the volume ratio of the N, N-dimethylformamide in the step (1) to the ethanol in the step (2) is (1-1.2) to (1-1.3); cu (NO) described in step (1)3)2 ·3H2The mol ratio of O to the organic micromolecule modifying reagent in the step (2) is 1:0.2-1: 0.9;
(3) and (3) adding the mixed nano slurry obtained in the step (1) into the mixed solution obtained in the step (2), uniformly mixing, standing for a synthesis reaction, wherein the synthesis reaction time is 10-15min, filtering to obtain a precipitate, heating the precipitate in vacuum for activation treatment, wherein the activation treatment temperature is 120-150 ℃, and the activation treatment time is 8-16h, so as to obtain the adsorbent for separating propylene and propane.
2. An adsorbent for separating propylene and propane produced by the production method according to claim 1.
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