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Synthetic diesel fuel and process for its production

A gasoline and product technology, applied in the petroleum industry, preparation of liquid hydrocarbon mixtures, chemical modification of combustible gases, etc., can solve problems such as expensive additives and lack of performance in distillates

Inactive Publication Date: 2002-03-27
EXXON RES & ENG CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Processes for producing clean high cetane fractions from Fischer-Tropsch waxes have been discussed in the published literature, but the disclosed processes for producing such fractions also render the fractions lacking one or more important properties , such as lubricity
Therefore, the disclosed Fischer-Tropsch fractions require blending with other undesirable feedstocks or the use of expensive additives

Method used

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  • Synthetic diesel fuel and process for its production
  • Synthetic diesel fuel and process for its production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Mix 70% by weight of hydroisomerized F-T reactor wax, 16.8% by weight of hydrotreated F-T cold separator liquid and 13.2% by weight of hydrotreated F-T hot separator liquid Together, and mix well. Diesel A is the 260-700°F fraction of this blend separated by distillation and prepared as follows: using an amorphous silica-alumina containing cobalt and molybdenum promotion as described in USP 5,292,989 and USP 5,378,348 A fixed bed unit of catalyst, one pass, was used to produce the hydroisomerized F-T reactor wax. The conditions for hydroisomerization are 708°F, 750 psig H 2 , 2500SCF / B H 2 , the liquid hourly space velocity (LHSV) is 0.7-0.8. Hydroisomerization was performed using recycled unreacted 700°F+ reactor wax. The mixed feed ratio (fresh feed+recycle feed) / fresh feed was equal to 1.5. Hydrotreated F-T cold separator liquid and F-T hot separator liquid were prepared using a one-pass fixed bed reactor and a commercially available nickel catalyst. Hydrotreat...

Embodiment 2

[0059] 78% by weight of hydroisomerized F-T reactor wax, 12% by weight of unhydrotreated F-T cold separator liquid and 10% by weight of F-T hot separator liquid were mixed together, And well mixed. Diesel B is the 250-700°F fraction of this blend separated by distillation and prepared as follows: using an amorphous silica-alumina containing cobalt and molybdenum promotion as described in USP 5,292,989 and USP 5,378,348 A fixed bed unit of catalyst, one pass, was used to produce the hydroisomerized F-T reactor wax. The conditions for hydroisomerization are 690°F, 725 psigH 2 , 2500SCF / B H 2 , the liquid hourly space velocity (LHSV) is 0.6-0.7. Fuel B is of the present invention

[0060] Representative of Examples.

Embodiment 3

[0062]Diesels C and D are produced by distilling fuel B into two fractions. Diesel C represents the 250-500°F cut of Diesel B and Diesel D represents the 500-700°F cut of Diesel B.

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Abstract

Clean distillate useful as a diesel fuel or diesel blending stock is produced from Fischer-Tropsch wax by separating wax into heavier and lighter fractions; further separating the lighter fraction and hydroisomerizing the heavier fraction and that portion of the light fraction below about 500 DEG F. The isomerized product is blended with the untreated portion of the lighter fraction.

Description

field of invention [0001] The invention relates to a distillate material, which has a high cetane number and can be used as diesel oil or a blending material thereof, and to a preparation method of the distillate material. More particularly, the present invention relates to a process for the production of distillate feed from Fischer-Tropsch waxes. Background of the invention [0002] A clean fraction free, ie free of sulfur, nitrogen or aromatics, is or may be highly desirable as diesel or blended diesel. Clean fractions with a relatively high cetane number are particularly valuable. Typically petroleum derived distillates are unclean, typically they contain significant amounts of sulfur, nitrogen and aromatics, and their cetane numbers are relatively low. Clean distillates can be produced from petroleum based distillates by costly and severe hydrotreating. Such severe hydrotreating does little to improve the cetane number and is also detrimental to the lubricating prope...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C1/04C07C5/27C10G2/00C10K3/00C10L1/02C10L1/08C10L10/08C10L10/12
CPCC10L1/026C10L1/08
Inventor P·J·伯洛维茨R·J·维藤布林克B·R·库克
Owner EXXON RES & ENG CO