Process for improving cold flow properties and increasing yield of middle distillate feedstock through liquid full hydrotreating and dewaxing

Patent metadata

Field	Value
Publication number	US-9499750-B2
Application number	US-201414208258-A
Country	US
Kind code	B2
Filing date	Mar 13, 2014
Priority date	Mar 14, 2013
Publication date	Nov 22, 2016
Grant date	Nov 22, 2016

Abstract

Novel liquid-full process for improving cold flow properties and increasing yield of middle distillate fuel feedstock by hydrotreating and dewaxing the feedstock in liquid-full reactors.

First claim

What is claimed is:

1. A liquid-full process for hydroprocessing a middle distillate fuel feedstock, comprising:
(a) contacting the feedstock with (i) a diluent and (ii) hydrogen, to produce a feedstock/diluent/hydrogen mixture, wherein the hydrogen is dissolved in the mixture to provide a liquid feed;
(b) contacting the feedstock/diluent/hydrogen mixture with a hydrotreating catalyst in a first reaction zone, to produce a first product effluent; and
(c) contacting the first product effluent with a dewaxing catalyst in a second reaction zone, to produce a second product effluent comprising naphtha and a middle distillate product;

wherein the middle distillate product has at least one improved cold flow property compared to the middle distillate fuel feedstock and has the yield of at least 85 wt %, and wherein the middle distillate fuel feedstock has a nitrogen content of at least 200 wppm, and the middle distillate product has an iso- to n-paraffin ratio increase of at least 1.5 compared to the middle distillate fuel feedstock.

2. A liquid-full process for hydroprocessing a middle distillate fuel feedstock, comprising:
(a) contacting the feedstock with (i) a diluent and (ii) hydrogen, to produce a feedstock/diluent/hydrogen mixture, wherein the hydrogen is dissolved in the mixture to provide a liquid feed;
(b) contacting the feedstock/diluent/hydrogen mixture with a hydrotreating catalyst in a first reaction zone, to produce a first product effluent; and
(c) contacting the first product effluent with a dewaxing catalyst in a second reaction zone, to produce a second product effluent comprising naphtha and a middle distillate product;

wherein the middle distillate product has at least one improved cold flow property compared to the middle distillate fuel feedstock and has the yield of at least 85 wt %, and wherein the middle distillate fuel feedstock has a nitrogen content of at least 90 wppm, and the middle distillate product has an iso- to n-paraffin ratio increase of at least 18 compared to the middle distillate fuel feedstock.

3. The process of claim 1 , wherein the first product effluent includes H 2 S and NH 3 dissolved therein and is fed directly into the second reaction zone without separating ammonia, hydrogen sulfide and remaining hydrogen from the first product effluent.

4. The process of claim 1 , wherein the dewaxing catalyst comprises a zeolite.

5. The process of claim 2 , wherein the first product effluent includes H 2 S and NH 3 dissolved therein and is fed directly into the second reaction zone without separating ammonia, hydrogen sulfide and remaining hydrogen from the first product effluent.

6. The process of claim 2 , wherein the dewaxing catalyst comprises a zeolite.

7. The process of claim 1 , wherein the dewaxing catalyst is selected from the group consisting of catalysts comprising a non-precious metal and an oxide support, catalysts comprising a crystalline, microporous oxide structure without metal loaded on it, and catalysts comprising a molecular sieve without metal loaded on it.

8. The process of claim 1 , wherein the dewaxing catalyst comprises a crystalline, microporous oxide structure without metal loaded on it.

9. The process of claim 1 , wherein the dewaxing catalyst comprises a zeolite without metal loaded on it.

10. The process of claim 9 , wherein the zeolite has a 8-member ring structure, a 10-member ring structure, or a 12-member ring structure.

11. The process of claim 1 further comprising contacting the second product effluent with a hydrotreating catalyst in a third reaction zone to produce a third product effluent.

12. The process of claim 1 , wherein both the middle distillate fuel feedstock and the middle distillate product are diesels.

13. The process of claim 2 , wherein the dewaxing catalyst is selected from the group consisting of catalysts comprising a non-precious metal and an oxide support, catalysts comprising a crystalline, microporous oxide structure without metal loaded on it, and catalysts comprising a molecular sieve without metal loaded on it.

14. The process of claim 2 , wherein the dewaxing catalyst comprises a crystalline, microporous oxide structure without metal loaded on it.

15. The process of claim 2 , wherein the dewaxing catalyst comprises a zeolite without metal loaded on it.

16. The process of claim 15 , wherein the zeolite has a 8-member ring structure, a 10-member ring structure, or a 12-member ring structure.

17. The process of claim 2 further comprising contacting the second product effluent with a hydrotreating catalyst in a third reaction zone to produce a third product effluent.

18. The process of claim 2 , wherein both the middle distillate fuel feedstock and the middle distillate product are diesels.

Assignees

• Du Pont

Inventors

• Dindi Hasan
• Palit Sandeep
• Pulley Alan Howard
• Murillo Luis Eduardo
• Ta Thanh Gia
• Boeger Brian

Classifications

• C10G45/64

  containing crystalline alumino-silicates, e.g. molecular sieves · CPC title

• C10G45/58

  to change the structural skeleton of some of the hydrocarbon content without cracking the other hydrocarbons present, e.g. lowering pour point; Selective hydrocracking of normal paraffins (C10G32/00 takes precedence; improving or increasing the octane number or aromatic content of naphtha C10G35/00) · CPC title

• C10G2300/304

  Pour point, cloud point, cold flow properties · CPC title

• C10G2300/202

  Heteroatoms content, i.e. S, N, O, P · CPC title

• C10G45/22 Primary

  with hydrogen dissolved or suspended in the oil · CPC title