Bright stock production from low severity resid deasphalting

Patent metadata

Field	Value
Publication number	US-10808185-B2
Application number	US-201615390790-A
Country	US
Kind code	B2
Filing date	Dec 27, 2016
Priority date	Dec 28, 2015
Publication date	Oct 20, 2020
Grant date	Oct 20, 2020

Abstract

Methods are provided for forming lubricant base stocks from feeds such as vacuum resid or other 510° C.+ feeds. A feed can be deasphalted and then catalytically and/or solvent processed to form lubricant base stocks, including bright stocks that are resistant to haze formation.

First claim

The invention claimed is:

1. A method for making lubricant base stock, comprising:
performing solvent deasphalting using a C 4 or C 5 solvent under effective solvent deasphalting conditions on a feedstock having a T5 boiling point of at least 370° C., the effective solvent deasphalting conditions producing a yield of C 4 or C 5 deasphalted oil of at least about 50 wt% of the feedstock;
selecting first effective hydroprocessing conditions to hydroprocess a C 4 or C 5 deasphalted oil;
hydroprocessing at least a portion of the C 4 or C 5 deasphalted oil under first effective hydroprocessing conditions to form a hydroprocessed effluent having a sulfur content of 100 wppm or less and a nitrogen content of 100 wppm or less comprising a first amount of conversion of the at least a portion of the C 4 or C 5 deasphalted oil relative to 370° C., the at least a portion of the C 4 or C 5 deasphalted oil having an aromatics content of at least about 50 wt%, the first effective hydroprocessing conditions comprising exposing the C 4 or C 5 deasphalted oil to a supported catalyst, the supported catalyst comprising a zeolitic support;
separating the hydroprocessed effluent to form at least a fuels boiling range fraction and a hydroprocessed bottoms fraction;
hydroprocessing at least a portion of the hydroprocessed bottoms fraction under second effective hydroprocessing conditions, the second effective hydroprocessing conditions comprising:
hydrocracking the at least a portion of the hydroprocessed bottoms fraction under hydrocracking conditions to form a hydrocracked effluent,
catalytically dewaxing at least a portion of the hydrocracked effluent under catalytic dewaxing conditions comprising a second amount of conversion of the at least a portion of the C 4 or C 5 deasphalted oil relative to 370° C. to form a second hydroprocessing effluent comprising a catalytically dewaxed effluent, and
performing aromatic saturation on the catalytically dewaxed effluent prior to solvent extracting; and

solvent extracting at least a portion of the catalytically dewaxed effluent to form a solvent processed effluent,
wherein the solvent processed effluent comprises a 950° F.+(510° C.+) portion having a kinematic viscosity at 100° C. of 30 cSt or more, a viscosity index (VI) of at least 80, a pour point of −6° C. or less, and a cloud point of −2° C. or less.

2. The method of claim 1 , wherein at least a portion of the catalytically dewaxed effluent is solvent extracted, the solvent processed effluent comprising a 950° F.+(510° C.+) portion having an aromatics content of less than 10 wt%.

3. The method of claim 2 , wherein the solvent extracting comprises solvent extracting with n-methylpyrrolidone, furfural, or a combination thereof.

4. The method of claim 1 , wherein the 950° F.+(510° C.+) portion of the solvent processed effluent has a pour point of −10° C. or less; or wherein the 950° F.+( 510 ° C.+) portion of the solvent processed effluent has a cloud point of −10° C. or less; or a combination thereof.

5. The method of claim 1 , wherein the 950° F.+ (510° C.+) portion of the solvent processed effluent has a VI of at least 90.

6. The method of claim 1 , wherein at least a portion of the catalytically dewaxed effluent is solvent dewaxed, the first effective hydroprocessing conditions comprising conditions for conversion of 10 wt% to 40 wt% of the C 4 or C 5 deasphalted oil relative to a conversion temperature of 510° C.

7. The method of claim 6 , wherein the catalytically dewaxed effluent has a wax content of at least 6 wt%.

8. The method of claim 6 , wherein the solvent processed effluent has a wax content of at least 4 wt%.

9. The method of claim 1 , further comprising adding 0.1 wt% to 2.5 wt% of an additive to solvent processed effluent, the additive comprising a Group I bright stock, an alkylated naphthalene, or a combination thereof.

10. The method of claim 1 , wherein the solvent deasphalting further produces a residual rock portion.

11. The method of claim 10 , further comprising using the residual rock portion as a blend component to produce at least one of asphalt and fuel oil.

12. The method of claim 10 , further comprising using the residual rock portion as feed to a gasification process, the gasification process optionally comprising partial oxidation, fluid bed combustion, coking, or a combination thereof.

13. A method for making lubricant base stock, comprising:
performing solvent deasphalting using a C 4+ solvent under effective solvent deasphalting conditions on a feedstock having a T5 boiling point of at least 370° C., the effective solvent deasphalting conditions producing a yield of C 4+ deasphalted oil of at least about 50 wt% of the feedstock;
selecting first effective hydroprocessing conditions to hydroprocess the C 4+ deasphalted oil;
hydroprocessing at least a portion of the C 4+ deasphalted oil under first effective hydroprocessing conditions to form a hydroprocessed effluent having a CCR content of 1 wt% or less, a sulfur content of 100 wppm or less, and a nitrogen content of 100 wppm or less comprising a first amount of conversion of the at least a portion of the C 4+ deasphalted oil relative to 370° C., the at least a portion of the C 4+ deasphalted oil having an aromatics content of at least about 50 wt%, the first effective hydroprocessing conditions comprising exposing the C 4+ deasphalted oil to a supported catalyst, the supported catalyst comprising a zeolitic support;
separating the hydroprocessed effluent to form at least a fuels boiling range fraction and a hydroprocessed bottoms fraction;
hydroprocessing at least a portion of the hydroprocessed bottoms fraction under second effective hydroprocessing conditions, the second effective hydroprocessing conditions comprising:
hydrocracking the at least a portion of the hydroprocessed bottoms fraction under hydrocracking conditions to form a hydrocracked effluent,
catalytically dewaxing at least a portion of the hydrocracked effluent under catalytic dewaxing conditions comprising a second amount of conversion of the at least a portion of the C 4+ deasphalted oil relative to 370°C. to form a second hydroprocessing effluent comprising a catalytically dewaxed effluent, and
performing aromatic saturation on the catalytically dewaxed effluent prior to solvent dewaxing; and

solvent dewaxing at least a portion of the hydroprocessed bottoms fraction to form a solvent dewaxed effluent, the solvent dewaxed effluent comprising a 950° F.+ (510° C.+) portion having a kinematic viscosity at 100° C. of 30 cSt or more, a viscosity index (VI) of at least 80, a pour point of −6° C. or less, and a cloud point of −2° C. or less.

14. The method of claim 13 , wherein the 950° F.+(510° C.+) portion has a difference between a cloud point temperature and a pour point temperature of 15° C. or less.

15. The method of claim 13 , wherein hydroprocessing at least a portion of the C 4+ deasphalted oil comprises hydrotreating the at least a portion of the C 4+ deasphalted oil, hydrocracking the at least a portion of the C 4+ deasphalted oil, or a combination thereof.

16. The method of claim 13 , wherein the yield of C 4+ deasphalted oil is at least 55 wt%.

17. The method of claim 13 , wherein the C 4+ solvent comprises a mixture of two or more C 5 isomers.

18. The method of claim 13 , wherein performing solvent deasphalting comprises a deasphalting temperature of less than 190° C.

19. The method of claim 13 , wherein the C 4+ deasphalted oil has an aromatics content of at least 55 wt% b

Assignees

• Exxonmobil Res & Eng Co

Inventors

• Hilbert Timothy L
• Carroll Michael B
• Dandekar Ajit B
• Yohe Sara L
• Brown Stephen H
• Owens Tracie L
• Ross April D
• Senzer Eric B
• Pyl Steven
• Pathare Rugved P
• Yeh Lisa I-Ching
• Fingland Bradley R
• Aldous Keith K
• Kovvali Anjaneya S
• Fruchey Kendall S
• Green Sara K
• Henderson Camden N

Classifications

• Y02P20/129

  Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines · CPC title

• C01B2203/065

  using hydrotreating, e.g. hydrogenation, hydrodesulfurisation · CPC title

• C01B2203/0283

  containing a CO-shift step, i.e. a water gas shift step · CPC title

• C10G2300/202

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

• C10N2020/02

  Viscosity; Viscosity index · CPC title