Process to prepare paraffin wax

Patent metadata

Field	Value
Publication number	US-10774277-B2
Application number	US-201515540270-A
Country	US
Kind code	B2
Filing date	Dec 29, 2015
Priority date	Dec 31, 2014
Publication date	Sep 15, 2020
Grant date	Sep 15, 2020

Abstract

hydrofinishing one or more wax fractions having a congealing point in the range of 30 to 75° C. thereby obtaining one or more hydrofinished wax fractions having a congealing point in the range of 30 to 75° C.

First claim

That which is claimed is:

1. A process to prepare paraffins and waxes, the process at least comprising the following steps:
(a) providing a Fischer-Tropsch product stream comprising paraffins having from 10 to 300 carbon atoms;
(b) subjecting the Fischer-Tropsch product stream of step (a) to a hydrogenation step, thereby obtaining a hydrogenated Fischer-Tropsch product stream comprising 10 to 300 carbon atoms;
(c) separating the hydrogenated Fischer-Tropsch product stream of step (b), thereby obtaining at least a fraction comprising 10 to 17 carbon atoms and a fraction comprising 18 to 300 carbon atoms;
(d) separating the fraction comprising 18 to 300 carbon atoms of step (c), thereby obtaining one or more first light waxes having a congealing point in the range of 30 to 75° C. and a second heavy wax having a congealing point in the range of 75 to 120° C.;
(e) hydrofinishing one or more wax fractions having a congealing point in the range of 30 to 75° C. of step (d) thereby obtaining one or more hydrofinished wax fractions having a congealing point in the range of 30 to 75° C.

2. A process according to claim 1 , wherein the fraction comprising 18 to 300 carbon atoms of step (b), is separated in step (c) by vacuum distillation at a pressure between 5 and 20 mbar.

3. A process according to claim 1 , wherein the one or more first light waxes are obtained as distillate and/or side cuts in vacuum distillation.

4. A process according to claim 3 , wherein the one or more first light waxes are a first light wax fraction having a congealing point in the range of from 30 to 35° C., a second light wax fraction having a congealing point in the range of from 50 to 60° C. and a third light wax having a congealing point in the range of from 65 to 75° C.

5. A process according to claim 1 , wherein the second heavy wax of step (d) is separated, thereby obtaining at least one distillate wax fraction having a congealing point in the range of between 75 to 85° C. and at least one residual wax fraction having a congealing point in the range of from 95 to 120° C.

6. A process-according to claim 5 , wherein the distillate wax fraction having a congealing point in the range of between 75 to 85° C. is hydrofinished to obtain a hydrofinished heavy distillate wax fraction having a congealing point in the range of between 75 and 85° C.

7. A process according to claim 5 , wherein the residual wax fraction having a congealing point in the range of 95 to 120° C. is hydrofinished to obtain a hydrofinished heavy residual wax fraction having a congealing point in the range of 95 to 120° C.

8. A process according to claim 5 , wherein the second heavy wax of step (d) is separated by short path distillation at a pressure between 0.05 and 0.5 mbar.

9. A process according to claim 5 , wherein the second heavy wax of step (d) is separated by short path distillation at a pressure between 0.05 and 0.3 mbar.

10. A process according to claim 1 , wherein a part of the second heavy wax of step (d) is subjected to a hydrocracking/hydroisomerisation step to obtain a partly isomerised product.

11. A Fischer-Tropsch derived wax that has been obtained according to claim 1 having an oil content according to ASTM D721 of from 0.22 wt. % to 0.5 wt. %, wherein the Fischer-Tropsch derived wax has a congealing point in the range of 75 to 120° C.

12. A Fischer-Tropsch derived wax according to claim 11 , having a Saybolt colour of more than 25 cm, wherein the Fischer-Tropsch derived wax has a congealing point in the range of 75 to 120° C.

13. A process according to claim 1 , wherein the fraction comprising 18 to 300 carbon atoms of step (b), is separated in step (c) by vacuum distillation at a pressure between 5 and 15 mbar.

14. A process according to claim 1 , wherein the fraction comprising 18 to 300 carbon atoms of step (b), is separated in step (c) by vacuum distillation at a pressure between 10 and 15 mbar.

15. A process according to claim 1 , wherein the hydrofinished wax fraction has a Saybolt colour according to ASTM D156 of more than 25 cm.

16. A process according to claim 1 , wherein the hydrofinished wax fraction has a Saybolt colour according to ASTM D156 of more than 28 cm.

17. A Fischer-Tropsch derived wax that has been obtained according to claim 1 having an oil content according to ASTM D721 of from 0.22 wt. % to 0.5 wt. %, wherein the Fischer-Tropsch derived wax has a congealing point in the range of 95 to 120° C.

18. A Fischer-Tropsch derived wax according to claim 17 , having a Saybolt colour of more than 25 cm, wherein the Fischer-Tropsch derived wax has a congealing point in the range of 95 to 120° C.

Assignees

• Shell Oil Co

Inventors

• Hoek Arend
• Roovers Antonius Adrianus Maria
• Majumder Kaushik
• Toledano Hélène

Classifications

• C10G2/32

  with the use of catalysts · CPC title

• C10G45/02 Primary

  to eliminate hetero atoms without changing the skeleton of the hydrocarbon involved and without cracking into lower boiling hydrocarbons; Hydrofinishing · CPC title

• C08L91/08

  Mineral waxes · CPC title

• C10G2300/30

  Physical properties of feedstocks or products · CPC title

• C10G2300/1022

  Fischer-Tropsch products · CPC title