Methods for processing nitrogen rich renewable feedstocks

Patent metadata

Field	Value
Publication number	US-2016289136-A1
Application number	US-201514674298-A
Country	US
Kind code	A1
Filing date	Mar 31, 2015
Priority date	Mar 31, 2015
Publication date	Oct 6, 2016
Grant date	—

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

• C10G2400/04

  Diesel oil · CPC title

• C10L2270/026

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

• C10L1/08

  for compression ignition · CPC title

• C10G3/50

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

• C10L10/16 Primary

  Pour-point depressants · CPC title