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Application of modified M-SAPO-RHO zeolite molecular sieve used as ethylene selective adsorbent

A zeolite molecular sieve and selective adsorption technology, applied in the direction of molecular sieve characteristic silicoaluminophosphate, molecular sieve and base exchange compound, molecular sieve and base exchange phosphate, etc., can solve the problems of high preparation cost, poor stability, poor selectivity, etc., and achieve composition Good stability, efficient separation, and stable structure

Active Publication Date: 2020-04-21
LUOYANG JALON MICRO NANO NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the adsorbents used for the adsorption and separation of ethylene / ethane mainly include metal-organic framework (MOF), carbon materials, transition metal composite materials (Cu / Ag-alumina, resins, clays, carbons and zeolite), molecular sieves containing cations and Titanium-silicon molecular sieves (cationic zeolites and titanosilicates), etc., but there are disadvantages such as high preparation cost, poor stability and poor selectivity, which limit the application of the above materials in ethylene / ethane separation.

Method used

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  • Application of modified M-SAPO-RHO zeolite molecular sieve used as ethylene selective adsorbent
  • Application of modified M-SAPO-RHO zeolite molecular sieve used as ethylene selective adsorbent
  • Application of modified M-SAPO-RHO zeolite molecular sieve used as ethylene selective adsorbent

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preparation example Construction

[0034] In the present invention, the preparation method of the modified M-SAPO-RHO type zeolite molecular sieve preferably comprises the following steps:

[0035] Mixing a silicon source, an aluminum source, phosphoric acid, a template, cetyltrimethylammonium bromide, SAPO-RHO seed crystals and water to obtain an initial reaction gel; the template is diethylamine;

[0036] Crystallizing the initial reaction gel to obtain a SAPO-RHO type zeolite molecular sieve, the SAPO-RHO type molecular sieve contains a template;

[0037] Under the condition of not removing the template agent, the SAPO-RHO type zeolite molecular sieve is directly mixed with the cationic solution, and roasted after ion exchange reaction to obtain the modified M-SAPO-RHO type zeolite molecular sieve; the cationic solution Cations include Li + and / or Na + ; The concentration of the cationic solution is 0.5-1.0 mol / L.

[0038] In the present invention, unless otherwise specified, all raw material components a...

Embodiment 1

[0067] Under the condition of stirring at room temperature, add 2.3g of phosphoric acid and 1.4g of pseudo-boehmite into 7mL of water and stir to mix evenly, add 0.9g of silica sol and 0.15g of cetyltrimethylammonium bromide and stir for 2h Mix until uniform, then slowly add 1.75g ​​of diethylamine and stir for 3 hours to obtain an initial gel, then add 0.036g of SAPO-RHO seed crystals and stir for 15 minutes to obtain a final uniform initial reaction gel; transfer the gel to high pressure reaction In the kettle, crystallize at 200°C for 48h, then carry out suction filtration or centrifugal separation, and dry the obtained solid material at 100°C for 12h to obtain SAPO-RHO zeolite molecular sieve; the relative crystallinity of SAPO-RHO zeolite molecular sieve is 100%;

[0068] XRD pattern of SAPO-RHO type zeolite molecular sieve figure 1 shown by figure 1 It can be seen that the synthetic product of the present invention is a SAPO-RHO type zeolite molecular sieve with good c...

Embodiment 2

[0072]According to the ratio S / L=1:50 ratio of SAPO-RHO type zeolite molecular sieve quality and lithium chloride solution volume, the SAPO-RHO type zeolite molecular sieve prepared in Example 1 and 0.5mol / L lithium chloride solution were stirred at room temperature After mixing for 5 hours, filtering, washing the obtained solid material with deionized water, drying at 100°C for 12 hours, and then roasting in a muffle furnace at 600°C for 4 hours to obtain a modified Li-SAPO-RHO zeolite molecular sieve, wherein , Li / (Si+Al+P) molar ratio=0.07.

[0073] The modified Li-SAPO-RHO zeolite molecular sieve was activated under vacuum conditions at 350°C for 10 hours. After the sample was cooled to room temperature, a single-component gas isothermal adsorption-desorption test was performed. The test temperature was 298K and the test pressure was 1 bar, the separation results are shown in Table 1.

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Abstract

The invention provides application of a modified M-SAPO-RHO zeolite molecular used as an ethylene selective adsorbent, and belongs to the technical field of ethylene separation. The invention providesa modified M-SAPO-RHO type zeolite molecular sieving as an ethylene selective absorbent. M comprises Li<+> and / or Na<+>; and M / (Si + Al + P) in the modified M-SAPO-RHO type zeolite molecular sieve isequal to 0.01 to 0.17. The modified M-SAPO-RHO zeolite molecular sieve can achieve different separation effects by changing the variety and content of M<+> ions in the modified M-SAPO-RHO zeolite molecular sieve. The modified M-SAPO-RHO zeolite molecular sieve has high crystallinity, good composition stability and good ethylene selective adsorption performance, fine regulation and control of ethylene selective adsorption capacity and efficient separation of ethylene / ethane can be achieved, and the concentration of ethylene in a mixed gas is increased.

Description

technical field [0001] The invention relates to the technical field of ethylene separation, in particular to the application of a modified M-SAPO-RHO type zeolite molecular sieve as an ethylene selective adsorbent. Background technique [0002] Petrochemical industry is one of the pillar industries that promote the development of the world economy. At present, about 75% of petrochemical products are produced by ethylene, mainly polyethylene, ethylene oxide, dichloroethane, styrene, etc., so ethylene is a petrochemical industry. The leading product, commonly known as "the mother of petrochemical industry". [0003] At present, a lot of research has been done on the recovery of organic gases containing ethylene at home and abroad. Among them, the separation methods of ethylene mainly include cryogenic separation, absorption separation, adsorption separation and membrane separation. Among them, adsorption separation has high selectivity, simple process, and low cost, which are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/54C01B37/08C01B39/02C07C7/13C07C11/04C07C9/06B01J20/18B01J20/30
CPCC01B39/54C01B37/08C01B39/026B01J20/186C07C7/13C01P2002/72C01P2004/03C07C11/04C07C9/06
Inventor 闫文付王晓贺白璞李立博于吉红徐如人
Owner LUOYANG JALON MICRO NANO NEW MATERIALS CO LTD
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