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Ionothermal synthesis method of CHA type microporous aluminum phosphate molecular sieve membrane

A technology of aluminum phosphate molecular sieve and molecular sieve, which is applied in the production of molecular sieve and alkali-exchanged phosphate, molecular sieve characteristic silicoaluminophosphate, bulk chemicals, etc. It can solve problems such as potential safety hazards, heavy and complicated coating process, and environmental pollution, and achieve Easy operation, good gas separation and permeability performance, and environment-friendly effect

Inactive Publication Date: 2015-06-17
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above preparation methods all have certain shortcomings: the in situ synthesis method has relatively strict requirements on the substrate and synthesis conditions; the secondary synthesis method inevitably requires pre-prepared nano-scale molecular sieve crystals as seed crystals, and the coating process is cumbersome and complicated. ; In addition, since these two methods are based on hydrothermal synthesis technology, the self-generated pressure of the system generated during the synthesis process will lead to certain safety hazards; in addition, a large amount of acid-base waste liquid generated during the synthesis process will also cause certain damage to the environment. Pollution

Method used

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  • Ionothermal synthesis method of CHA type microporous aluminum phosphate molecular sieve membrane
  • Ionothermal synthesis method of CHA type microporous aluminum phosphate molecular sieve membrane
  • Ionothermal synthesis method of CHA type microporous aluminum phosphate molecular sieve membrane

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Embodiment 1

[0031] Add 76.4 grams of 1-ethyl-3-methylimidazolium bromide ionic liquid into a 100 ml beaker, heat up to 100°C, evenly add 0.5 grams of hydrofluoric acid with a mass concentration of 40%, stir for 0.5 hours until uniform, and obtain F in mineralizer ionic liquid solution - : The molar ratio of the ionic liquid is 1:40; then the mineralizer ionic liquid solution is poured into the reactor with the δ-alumina carrier placed in advance, and the carrier must be completely immersed in the reaction solution, the support body and the mineralizer The dosage ratio of the ionic liquid solution is 0.5 (cm 2 ·ml -1 surface area of ​​the support), the reactor was heated to 210°C and kept for 1 hour, and then the carrier was taken out; 76.4 grams of 1-ethyl-3-methylimidazolium bromide ionic liquid was added to another 100 ml beaker, and the temperature was raised to 100 ℃, evenly drop 1.15 g of phosphoric acid with a mass concentration of 85% and 0.41 g of N-methylimidazole, and P in the i...

Embodiment 2

[0034] Add 76.4 grams of 1-ethyl-3-methylimidazolium bromide ionic liquid into a 100 milliliter beaker, heat up to 100 ° C, evenly add 0.05 grams of hydrofluoric acid with a mass concentration of 40%, stir for 0.5 hours until uniform, and obtain F in mineralizer ionic liquid solution - : The molar ratio of the ionic liquid is 1:400; then pour the mineralizer ionic liquid solution into the reactor with the δ-alumina carrier placed in advance, pay attention that the carrier must be completely immersed in the reaction solution, the support body and the mineralizer The dosage ratio of the ionic liquid solution is 0.8 (cm 2 ·ml -1 surface area of ​​the support), the reactor was heated to 120°C and kept for 480 hours, and then the carrier was taken out; 76.4 grams of 1-ethyl-3-methylimidazolium bromide ionic liquid was added to another 100 ml beaker, and the temperature was raised to 100 ℃, evenly drop 0.12 g of phosphoric acid with a mass concentration of 85% and 0.21 g of N-meth...

Embodiment 3

[0036] Add 76.4 grams of 1-ethyl-3-methylimidazolium bromide ionic liquid into a 100 ml beaker, heat up to 100° C., evenly add 1.0 grams of hydrofluoric acid with a mass concentration of 40%, stir for 0.5 hours until uniform, and obtain F in mineralizer ionic liquid solution - : The molar ratio of the ionic liquid is 1:20; then pour the mineralizer ionic liquid solution into the reactor with the θ-alumina carrier placed in advance, pay attention that the carrier must be completely immersed in the reaction solution, the support body and the mineralizer The dosage ratio of the ionic liquid solution is 0.4 (cm 2 ·ml -1 surface area of ​​the support body), the reactor was heated to 160°C and kept for 4 hours, and then the carrier was taken out; 76.4 grams of 1-ethyl-3-methylimidazolium bromide ionic liquid was added to another 100 ml beaker, and the temperature was raised to 100 ℃, evenly drop 2.30 grams of phosphoric acid with a mass concentration of 85% and 0.41 grams of N-met...

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Abstract

The present invention discloses an ionothermal synthesis method of a CHA type microporous aluminum phosphate molecular sieve membrane, wherein an imidazole-based ionic liquid is used as a solvent to synthesize an AlPO4-34 molecular sieve membrane on the surface of an alumina carrier through an ionothermal two-step synthesis method. The method of the present invention has the following characteristics that: the ionic liquid is used as the solvent and the template agent to carry out the crystallization reaction under the normal pressure, such that the safe hidden danger caused by the system self-pressure during the conventional molecular sieve membrane synthesis process is overcome; acid-alkali waste liquid emission does not exist, and the environment protection property is provided; and the operation is simple, the synthesis liquid aging is not required, the crystal seed introducing is not required, and the industrial expanding production is easily achieved.

Description

technical field [0001] The present invention relates to an ionothermal synthesis method of a microporous aluminum phosphate molecular sieve membrane, and more precisely relates to an aluminum phosphate molecular sieve (AlPO) having a CHA-type zeolite structure. 4 -34) and its synthesis in ionic liquids. Background technique [0002] Molecular sieves are a class of inorganic microporous materials with regular pore structures. For decades, researchers and engineers have been working on the research and synthesis of molecular sieves with different pore characteristics as catalysts for specific chemical reaction processes. With the continuous advancement of science and technology, people gradually realize that if molecular sieves can be prepared into membranes, they can combine the characteristics of molecular sieve materials and film materials to greatly broaden their application fields: using the precise molecular sieving function of molecular sieve micropores At the same ti...

Claims

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Application Information

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IPC IPC(8): C01B37/08C01B39/54
CPCY02P20/54
Inventor 田志坚厉晓蕾李科达马怀军徐仁顺王炳春
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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