Hydrocarbon conversion process using molecular sieve of MFS framework type

A process for hydrocarbon conversion comprising the steps of:

• (a) providing a mixture comprising at least one source of ions of tetravalent element (Y), at least one source of ions of trivalent element (X), at least one hydroxide source (OH—), at least one structure-directing-agent (R), at least one seed source (Seed), and water (H2O), said mixture having the following mole composition (expressed in term of oxide):
• YO2:(n)X2O3:(x)OH—:(y)R:(z)H2O+(m)Seed
• wherein m is in the range of from about 10 wtppm to about 2 wt. % (based on total weight of the synthesis mixture), n is in the range of from about 0.005 to 0.05, x is in the range of from about 0.01 to about 0.3, y is in the range of from about 0.03 to about 2;
• and z is in the range of from about 3 to about 8;
• (b) treating said mixture under crystallization conditions to form a product comprising said crystalline molecular sieve of MFS framework type and less than 50 wt. % of non-MFS material, based on the combination weight of non-MFS materials and the molecular sieve(s) of MFS framework type,
• wherein said structure-directing-agent R comprises N,N,N,N′,N′,N′-hexaethylpentane diammonium salt and a tetraethylammonium halide or hydroxide, said crystallization conditions comprise a temperature in the range of from about 150° C. to about 250° C., and a crystallization time less than 100 hr, and wherein the weight hourly throughput is at least 0.002 hr−1;
• (c) recovering said crystalline molecular sieve of MFS framework type from said product;
• and,
• (d) contacting a hydrocarbon with said crystalline molecular sieve of MFS framework type under hydrocarbon conversion conditions to form a converted hydrocarbon.