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Organically modified molecular sieve and preparation method and application thereof

A molecular sieve and carbon molecular sieve technology, which is applied to the field of organic modified molecular sieve and its preparation, can solve the problems of high temperature energy consumption process of activation pore expansion, high separation energy consumption, low nitrogen and methane separation, and achieves simple and controllable preparation method, The effect of large separation ratio and low cost

Active Publication Date: 2020-02-11
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Using this method, although nitrogen can be separated and adsorbed, the adsorption of methane will also increase, resulting in a low yield of methane
In addition, using CO 2 Activated hole reaming has defects such as high temperature energy consumption and complicated process
[0009] In summary, most of the existing methods for improving carbon molecular sieves are through deposition plugging or activation of pore expansion processes, in order to improve the N 2 At the same time as the adsorption capacity, it will inevitably increase the CH 4 In addition, when the adsorbent preferentially adsorbs methane, the second desorption and recompression of methane is required to realize the enrichment and utilization of methane, and the energy consumption of separation is relatively high.

Method used

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  • Organically modified molecular sieve and preparation method and application thereof
  • Organically modified molecular sieve and preparation method and application thereof
  • Organically modified molecular sieve and preparation method and application thereof

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preparation example Construction

[0035] The preparation method of the organic modified molecular sieve of the present invention comprises the following steps: after impregnating the molecular sieve with an organic matter solution, separating the solid from the liquid, and drying the solid to obtain an organically modified molecular sieve; wherein, the general structural formula of the organic matter is: m is any integer from 0 to 4, n is the degree of polymerization, R is -OH, -COOH, -CONH 2 、-COOCH 3 or -COOCH 2 CH 3 .

[0036] Research has found that the R groups in the above-mentioned organic matter can form hydrogen bonds with the hydroxyl groups in the molecular sieve, thereby adjusting the pore size of the molecular sieve to achieve the effect of adjusting the pore size, so that it can have a shape selection effect when separating gases, especially In separation (N 2 +O 2 ) / CH 4 when CH 4 The molecular dynamics diameter is 0.38nm, N 2 The molecular dynamics diameter of oxygen is 0.364nm, and th...

Embodiment 1

[0053] The PVA modified carbon molecular sieve is prepared by the following method:

[0054] 1) Configure PVA aqueous solution: at a temperature of 90°C, mix a certain amount of PVA with deionized water, and then stir for a certain period of time until the foam in the PVA aqueous solution gradually disappears, the solution is clear and transparent, and the obtained concentration is 1wt%. PVA solution;

[0055] 2) Fully mix and stir the ground carbon molecular sieve (40-60 mesh) and the PVA solution, then filter and separate the modified carbon molecular sieve solid impregnated with organic polymer, and filter the filtered solid at 150°C Dry overnight to obtain the final PVA-modified carbon molecular sieve sample.

[0056] The specific surface area of ​​the raw material carbon molecular sieve and the modified carbon molecular sieve sample is measured by BET method, and the spectra are shown in figure 1 .

[0057] from figure 1 It can be seen that after the modification of t...

Embodiment 2～6

[0059] By using the method of Example 1, only changing the concentration of the PVA solution, a series of carbon molecular sieves modified by PVA solutions with different concentrations were obtained, and the specific changed parameters are shown in Table 1.

[0060] Table 1

[0061] Example number Concentration of PVA solution (%) Example 1 1 Example 2 2 Example 3 3 Example 4 4 Example 5 5 Example 6 10

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Abstract

The invention relates to an organically modified molecular sieve and a preparation method and application thereof, belonging to the technical field of adsorbents. To overcome technical problems in theprior art, the invention provides the preparation method of the organically modified molecular sieve. The method comprises the following steps: impregnating a molecular sieve with an organic matter solution, performing solid-liquid separation, and drying the obtained solid to obtain the modified molecular sieve. According to the invention, the molecular sieve is subjected to impregnation modification so as to successfully prepare the organically modified molecular sieve; the preparation method is simple and controllable in process, low in energy consumption and low in cost; the obtained modified molecular sieve can be used as a selective adsorbent for N2 / CH4, O2 / CH4, (N2 + O2) / CH4 and other systems; in particular, when the modified molecular sieve is used for separation of N2 / CH4, the adsorption amount of CH4 is low, and the separation ratio of nitrogen to methane is large; and the modified molecular sieve can be applied to purification of methane in coalbed methane, oilfield gas or biogas.

Description

technical field [0001] The invention relates to an organically modified molecular sieve, a preparation method and application thereof, and belongs to the technical field of adsorbents. Background technique [0002] Methane (CH 4 ), as a major energy and chemical raw material, widely used in civil and industrial; methane can be used to produce acetylene, hydrogen, synthetic ammonia, carbon black, nichloromethane, carbon disulfide, monochloromethane, dichloromethane, Methane, carbon tetrachloride and hydrocyanic acid, etc.; in addition, methane is a greenhouse gas with significant greenhouse effect, CH 4 for CO 2 It is 21 times stronger than molecular greenhouse effect, 7 times stronger than carbon dioxide in destroying the ozone layer, and CH 4 Emissions into the atmosphere, on the one hand, cause a serious waste of resources, and on the other hand, lead to the greenhouse effect. Therefore, CH in oil field gas (Oil field gas), coal bed methane (Coalbedmethane, CBM) and bi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30B01J20/18B01D53/02C10L3/10
CPCB01D53/02B01D2253/102B01D2253/108B01D2253/116B01D2256/10B01D2257/7025B01J20/186B01J20/20C10L3/101Y02C20/20
Inventor 敬方梨王荣罗仕忠沈俊李映春黄显波
Owner SICHUAN UNIV
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