A kind of method for producing sapo molecular sieve

Abstract

The invention discloses a method for industrially producing SAPO molecular sieves, which comprises the following steps: mixing the synthesized SAPO molecular sieve crystallization liquid with an acidic solution, and then separating, washing and drying the obtained solid phase to obtain molecular sieve raw powder, wherein , the solvent includes phosphoric acid solution. The method provided by the invention has important value for improving industrial production efficiency.

Description

technical field [0001] The invention provides a production method of SAPO molecular sieves, in particular to a method for realizing effective solid-liquid separation of SAPO-11 molecular sieves from crystallization mother liquor by adding reagents. Background technique [0002] In 1982, Union Carbide Corporation of the United States successfully synthesized aluminum phosphate molecular sieve AIPO-n, which is composed of AlO2 and PO2 tetrahedrons alternately, and does not have B acidity because it has no exchangeable charges. Si atoms are introduced into the framework of aluminum phosphate molecular sieves to form silicoaluminophosphate SAPO-n molecular sieves. The framework is composed of Si, P, Al, and O elements, so that the original electrically neutral aluminum phosphate molecular sieves have exchangeable charges and form B acidic centers. Therefore, it can be widely used in various refining and chemical industries such as catalytic cracking, alkylation of branched aroma...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the deficiencies in the prior art, the present invention provides a production method that solves problems such as the difficulty of solid-liquid separation in the industrial production of SAPO molecular sieves. By adding an acidic solution to the crystallization mother liquor, the solid-liquid separation of the mother liquor is effectively realized.

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