Methods for processing nitrogen rich renewable feedstocks

Patent metadata

Field	Value
Publication number	US-9637699-B2
Application number	US-201514674298-A
Country	US
Kind code	B2
Filing date	Mar 31, 2015
Priority date	Mar 31, 2015
Publication date	May 2, 2017
Grant date	May 2, 2017

Abstract

Processes for producing a fuel from a renewable feedstock which may have more than 60 ppm nitrogen. The renewable feedstock is passed to a deoxygenation zone. A hydrogen stream, preferably formed from a recycled gas, is introduced into the deoxygenation zone at a relatively high rate. The hydrogen introduction may be between 3 to 5 times the rate of hydrogen consumption in the deoxygenation zone. The hydrogen introduction may also be between 6000 to 9000 SCF/BBL. A deoxygenated effluent, comprising less than 1 wppm nitrogen, may be isomerized and separated into one or more product hydrocarbon streams such as a diesel fuel or aviation fuel.

First claim

What is claimed is:

1. A process for converting a renewable feedstock into a fuel, the process comprising:
deoxygenating a renewable feedstock in the presence of hydrogen in a deoxygenation zone comprising a catalyst and being operated under conditions to provide a deoxygenated effluent;
introducing hydrogen to the deoxygenation zone at a rate of between 6000 to 9000 SCF/BBL; and,
isomerizing the deoxygenated effluent in an isomerization zone comprising a catalyst and being operated under conditions to improve at least one cold flow property of the deoxygenated effluent in an isomerized effluent.

2. The process of claim 1 wherein the deoxygenated effluent comprises less than 1 wppm of nitrogen.

3. The process of claim 1 wherein the deoxygenated effluent comprises less than 100 wppb of nitrogen.

4. The process of claim 1 wherein the rate of hydrogen introduction is between 7000 to 8000 SCF/BBL.

5. The process of claim 4 wherein the deoxygenation zone and the isomerization zone are contained within different reactors.

6. The process of claim 1 wherein the renewable feedstock comprises >60 ppm nitrogen.

7. The process of claim 6 wherein the renewable feedstock comprises >100 ppm nitrogen.

8. The process of claim 1 wherein the rate of hydrogen introduction is between approximately three to five times a rate of hydrogen consumption in the deoxygenation zone.

9. The process of claim 1 wherein the hydrogen introduced into the deoxygenation zone comprises a hydrogen containing gas comprising between 75-85% hydrogen.

10. A process for converting a renewable feedstock into a fuel product, the process comprising:
passing a renewable feedstock to a deoxygenation zone comprising a catalyst and being operated under conditions to provide a deoxygenated effluent;
introducing a hydrogen containing gas to the deoxygenation zone such that a rate of hydrogen introduction is between approximately three to five times a rate of hydrogen consumption in the deoxygenation zone;
deoxygenating the renewable feedstock in the deoxygenation zone to provide a deoxygenated effluent; and,
isomerizing the deoxygenated effluent in an isomerization zone comprising a catalyst and being operated under conditions to improve at least one cold flow property of the deoxygenated effluent in an isomerized effluent.

11. The process of claim 10 , wherein the hydrogen containing gas introduced into the deoxygenation zone comprises between 75-85% hydrogen.

12. The process of claim 10 wherein the renewable feedstock comprises >60 ppm nitrogen.

13. The process of claim 10 wherein the rate of hydrogen introduction is between 6000 to 9000 SCF/BBL.

14. The process of claim 13 wherein a pressure in the deoxygenation zone is between 3.45 and 6.89 MPa (500 and 1000 psig).

15. The process of claim 14 wherein the rate of hydrogen introduction is between 7000 and 8000 SCF/BBL.

16. The process of claim 15 wherein the renewable feedstock comprises >60 ppm and wherein deoxygenated effluent comprises less than 100 wppb of nitrogen.

17. The process of claim 10 wherein the renewable feedstock comprises >60 ppm and wherein deoxygenated effluent comprises less than 1 wppm of nitrogen.

18. The process of claim 17 wherein rate of hydrogen introduction is approximately 4 times the rate of hydrogen consumption in the deoxygenation zone.

19. The process of claim 10 wherein the deoxygenation zone and the isomerization zone are contained within different reactors.

20. The process of claim 10 further comprising:
passing the isomerized effluent to a separation zone to provide at least one transportation fuel stream and at least one gas stream, the gas stream including hydrogen, and the transportation fuel stream comprising a diesel fuel stream; and,
compressing at least a portion of the gas stream from the separation zone to provide at least a portion of the hydrogen containing gas injected into the deoxygenation zone.

Assignees

• Uop Llc

Inventors

• Ellig Daniel
• Eizenga Donald A

Classifications

• C10G3/50

  in the presence of hydrogen, hydrogen donors or hydrogen generating compounds · CPC title

• C10G2400/04

  Diesel oil · CPC title

• C10L2270/026

  for diesel engines, e.g. automobiles, stationary, marine · CPC title

• Y02T50/678

  Aviation using fuels of non-fossil origin · CPC title

• C10L10/16 Primary

  Pour-point depressants · CPC title