METHOD FOR SYNTHESIS OF PRECURSOR OF SILICOALUMINOPHOSPHORIC ACID MOLECULAR SIEVE, PRECURSOR OBTAINED THEREBY, AND APPLICATIONS OF SAID PRECURSOR TO PROVIDE SAID SIEVE

摘要

PURPOSE: To synthesize a precursor of a molecular sieve by heating a reaction mixture contg. water, sources of aluminum, silicon and phosphorus and an org. skeleton structure modifier at a specified temp. and separating the crystallized solid. CONSTITUTION: Water, sources of aluminum, silicon and phosphorus and an org. skeleton structure modifier are blended to prepare a reaction mixture. This mixture is heated at >=100 deg.C under autogenous pressure for a sufficient time to cause crystallization and the crystallized solid is separated to synthesize a precursor of a molecular sieve of the silicoaluminophosphate type. In this case, it is necessary to incorporate hydrogen fluoride as a source of fluoride anions into the reaction mixture. An amorphous silica-alumina gel or a crystalline aluminosilicate is suitable for use as the sources of aluminum and silicon.