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Preparation of ael structure aluminum phosphate molecular sieve membrane supported by porous alumina carrier

A technology of aluminum phosphate molecular sieve and porous alumina, applied in the direction of molecular sieve characteristic aluminum phosphate, molecular sieve and alkali-exchanged phosphate and phosphorus compounds, etc., can solve problems such as hidden safety hazards, environmental pollution, heavy and complicated coating process, etc., and achieve easy operation. , Environmentally friendly, good gas separation and permeability effect

Active Publication Date: 2016-01-20
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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  • Preparation of ael structure aluminum phosphate molecular sieve membrane supported by porous alumina carrier
  • Preparation of ael structure aluminum phosphate molecular sieve membrane supported by porous alumina carrier
  • Preparation of ael structure aluminum phosphate molecular sieve membrane supported by porous alumina carrier

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Experimental program
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Effect test

Embodiment 1

[0031] Add 76.4 grams of 1-ethyl-3-methylimidazolium bromide ionic liquid respectively in two 100 milliliter beakers, raise the temperature to 100° C., and add 0.5 grams of hydrofluoric acid with a mass concentration of 40% and 1.15 grams of mass concentration Concentration is 85% phosphoric acid, stir respectively 2 hours to evenly, in the obtained mineralizer ionic liquid solution, F - : The molar ratio of the ionic liquid is 1:40; P in the phosphorus-containing ionic liquid solution 2 O 5: The molar ratio of the ionic liquid is 1:80; then pour the hydrofluoric acid ionic liquid solution into the reactor pre-placed with the alumina carrier, paying attention that the carrier needs to be completely immersed in the reaction solution, the support body and the precursor reaction solution The dosage ratio is 0.5 (cm 2 ·ml -1 support surface area), the reactor was heated to 210 °C and held for 1 hour, then the carrier was taken out, put into another reactor, the phosphoric acid ...

Embodiment 2

[0034] 76.4 grams of 1-ethyl-3-methylimidazolium bromide ionic liquid were added to two 100-ml beakers respectively, the temperature was raised to 100 °C, and 2 grams of hydrofluoric acid with a mass concentration of 40% and 1.15 grams of mass were uniformly added dropwise. Phosphoric acid with a concentration of 85% was stirred for 2 hours until uniform, and F in the obtained mineralizer ionic liquid solution - : The molar ratio of ionic liquid is 1:10; 2 O 5 : The molar ratio of the ionic liquid is 1:80; then pour the hydrofluoric acid ionic liquid solution into the reactor pre-placed with the alumina carrier, paying attention that the carrier needs to be completely immersed in the reaction solution, the support body and the precursor reaction solution The dosage ratio is 0.5 (cm 2 ·ml -1 support surface area), the reactor was heated to 280 °C and held for 0.5 hours, then the carrier was taken out, put into another reactor, the phosphoric acid ionic liquid solution was po...

Embodiment 3

[0036] 76.4 grams of 1-ethyl-3-methylimidazolium bromide ionic liquid were added to two 100-ml beakers, the temperature was raised to 100 °C, and 0.5 grams of hydrofluoric acid with a mass concentration of 40% and 4.6 grams of mass were uniformly added dropwise. Phosphoric acid with a concentration of 85% was stirred for 2 hours until uniform, and F in the obtained mineralizer ionic liquid solution - : The molar ratio of ionic liquid is 1:40; 2 O 5 : The molar ratio of the ionic liquid is 1:20; then the hydrofluoric acid ionic liquid solution is poured into the reactor pre-placed with the alumina carrier, paying attention that the carrier needs to be completely immersed in the reaction solution, and the support body and the precursor reaction solution The dosage ratio is 0.5 (cm 2 ·ml -1 support surface area), the reactor was heated to 120 °C and held for 3 hours, then the carrier was taken out, put into another reactor, the phosphoric acid ionic liquid solution was poured ...

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Abstract

The invention discloses an ionothermal synthetic method for a micropore aluminium-phosphate molecular-sieve membrane. An imidazolyl ionic liquid is taken as a solvent, on the surface of an aluminium oxide carrier, an ionothermal two-step synthesis method is utilized to synthesize the AlPO4-11 molecular sieve membrane. The method is characterized in that the ionic liquid is employed as the solvent and a template, and a crystallization reaction is performed at normal pressure, so that the safety hidden trouble brought by system authigenic pressure in a routine synthesis process of a molecular sieve membrane is overcome; no acid and alkali waste liquids are discharged, and the method is friendly to environment; and the method is simple in operation, does not need to perform ageing of a synthetic solution, does not need to introduce a crystal seed, and is easy for industrialized enlargement production.

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 an AEL zeolite structure. 4 -11) and its synthesis method in ionic liquid. 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B37/04C01B39/54
CPCY02P20/54
Inventor 田志坚李科达厉晓蕾马怀军徐仁顺王炳春
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI