Preparation method of SAPO-34 molecular sieve membrane

• Main Authors: JIAO GUANGLEI, ZHANG JIUMEI, FENG XUELIAN, LI XIAOYONG, TANG YUDONG, LI JIE, JIE ZHIYUAN, SONG TAO, ZHAO SHIKAI, ZHANG ZHEN, LI LIANG
• Format: Patent
• Language: Chinese; English
• Published: 27.10.2023
• Subjects: CHEMISTRY; COMPOUNDS THEREOF; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS

The invention discloses a preparation method of an SAPO-34 molecular sieve membrane. The preparation method comprises the following steps: preparing primary molecular sieve synthesis mother liquor; placing an alumina support in the primary molecular sieve synthesis mother liquor for hydrothermal reaction to obtain an alumina support attached with a primary molecular sieve membrane layer; waste liquid obtained after the hydrothermal reaction is subjected to stage treatment, and first-stage recycled liquid, second-stage recycled liquid, third-stage recycled liquid and molecular sieve powder are obtained; preparing secondary molecular sieve synthesis mother liquor by using the primary recovery liquid; placing the alumina support attached with the primary molecular sieve membrane layer in a secondary molecular sieve synthesis mother solution for hydrothermal reaction to obtain an alumina support attached with a secondary molecular sieve membrane layer; according to the preset molecular sieve membrane thickness, w