Method of synthesizing an olefin product from an oxygenate feedstock utilizing silicoaluminophosphate molecular sieves

A method for making an olefin product from an oxygenate feedstock comprising:

• synthesizing a silicoaluminophosphate molecular sieve by a method consisting of:
• (a) preparing a synthesis mixture comprising the steps of
• (i) combining a source of phosphorus and at least one organic directing agent, wherein the mixing of said phosphorus source and said organic directing agent can generate heat and raise the temperature of said synthesis mixture;
• but wherein the temperature of the combination of said phosphorus source and said organic directing agent is controlled so that said temperature does not exceed 50° C. during substantially this entire step (i);
• (ii) introducing a source of aluminum into the combination of the phosphorus source and organic directing agent, the temperature of said combination being less than or equal to 50° C. when addition of said source of aluminum begins;
• and
• (iii) introducing a source of silicon into said combination of the phosphorus source and the organic directing agent after or simultaneously with the introduction of said source of aluminum, the temperature of said combination being less than or equal to 50° C. when addition of said source of silicon begins, and
• (iv) further comprising allowing said synthesis mixture to age at a temperature of between 10° C. and 30° C. for a time up to about 12 hours;
• (b) heating said synthesis mixture to a crystallization temperature of between about 100° C. and about 300° C.;
• and
• (c) recovering a SAPO-18, SAPO-34, or mixtures thereof molecular sieve;
• contacting said oxygenate feedstock with the synthesized silicoaluminophosphate molecular sieve.