Patent ID: 11891580
Assignee: SHELL USA, INC.
Field: Basic materials chemistry (Chemistry)
Classification: CPC C | IPC C

Claim 6:
7. A process for preparing a microcrystalline wax, the process at least comprising the following steps:
a. providing a FT wax having a carbon chain length distribution in the range of from 20 to above 120 and a crystallinity according to XRD of more than 75%, wherein at least 1 wt. % of the FT wax has a carbon chain length of more than 120;
b. subjecting the FT wax to an isomerization step at temperatures in the range of from 200 to 400° C. and a pressure between 1 to 25 M Pa, and a WHSV between 0.1 and 5 kg/I/h, using a catalyst comprising a molecular sieve with a pore size between 5 and 7 angstrom and a SiO2/Al2O3ratio of at least 25and a group VIII metal to obtain a microcrystalline wax having a needle penetration according to ASTM D-1321 at 25° C. of more than 1, a crystallinity according to XRD between 5 and 70%, an initial boiling point of less than 500° C., a congealing point in the range of from 60 to 120° C., an oil content according to ASTM D-721 of more than 2 wt. %, wherein the microcrystalline wax has a fraction up to C40 having at least 5 wt % of multiple methyl-branched paraffins as determined with GC×GC, and wherein the microcrystalline wax comprises molecules with carbon numbers above 120.