Lube base oils with improved yield
AssigneeChevron U.S.A. Inc.
InventorDennis J. O'Rear
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Abstract
The invention provides methods for preparing a blended lube base oils comprising at least one highly paraffinic Fischer Tropsch lube base stocks and at least one base stock composed of alkylaromatics, alkylcycloparaffins, or mixtures thereof. The use of base stocks composed of alkylaromatics, alkylcycloparaffins, or mixtures thereof improves the yield of lube base oils from Fischer Tropsch facilities, as well as provides moderate improvements in physical properties including additive solubility. The invention provides processes for obtaining such blended lube base oils using the products of Fischer Tropsch processes.
Claims21
A process for preparing a blended lube base oil comprising the steps of:
- a) blending:
- i) at least one highly paraffinic Fischer-Tropsch derived lube base stock having a viscosity of greater than 3 cSt when measured at 40° C., having a branching index of less than 5, and having an average length of alkyl side branches of less than 2 carbon atoms;
- and
- ii) at least one base stock composed of alkylaromatics, alkylcycloparaffins, or mixtures thereof and having a viscosity of greater than 2 cSt when measured at 40° C., wherein base stock (ii) is present in an amount of from about 1 wt % to about 50 wt %;
- and
- b) isolating the blended lube base oil.
A process for preparing a blended lube base oil comprising the steps of:
- a) alkylating aromatics with a light feedstock containing olefins and alcohols to form alkylaromatics boiling in the lube base oil range;
- b) (b) subjecting Fischer Tropsch derived waxy streams to hydroisomerizing conditions to form highly paraffinic lube base stock;
- and
- c) (c) blending the alkylaromatics and the highly paraffinic lube base stock to form a blended lube base oil wherein the blended lube base oil has a viscosity of greater than 3 cSt when measured at 40° C.
A process for increasing the yield of lube base oil from a Fischer Tropsch facility comprising the steps of:
- a) performing Fischer-Tropsch synthesis on syngas to provide a product stream;
- b) fractionally distilling the product stream and isolating a C20+ fraction, an aromatics fraction, and a light feedstock containing olefins and alcohols;
- c) subjecting the C20+ fraction to hydroisomerizing conditions to form highly paraffinic lube base stock;
- d) alkylating the aromatics with the light feedstock to form alkylaromatics boiling in the lube base oil range;
- e) optionally subjecting a portion of the alkylaromatics from step (d) to hydrogenation under catalytic hydrogenating conditions to form alkylcycloparaffins boiling in the lube base oil range;
- f) blending the alkylaromatics, optional alkylcycloparaffins, and the highly paraffinic lube base stock to form a blended lube base oil;
- and
- g) isolating the blended lube base oil.
A process for preparing a blended lube base oil comprising the steps of:
- a) performing Fischer-Tropsch synthesis on syngas using a catalyst which provides low to moderate chain growth probabilities to provide a reformable light stream, an aromatics stream, and a light stream containing olefins and alcohols;
- b) performing Fischer-Tropsch synthesis on syngas using a catalyst which provides high chain growth probabilities to provide a highly paraffinic C20+ stream;
- c) subjecting the C20+ stream to hydroisomerizing conditions to form highly paraffinic lube base stock;
- d) alkylating the aromatics stream with the light stream containing olefins and alcohols to form alkylaromatics boiling in the lube base oil range;
- e) subjecting the reformable light stream to reforming under catalytic reforming conditions to form additional aromatics for alkylating;
- f) optionally subjecting a portion of the alkylaromatics boiling in the lube base oil range to hydrogenation under catalytic hydrogenating conditions to form alkylcycloparaffins boiling in the lube base oil range;
- g) blending the alkylaromatics boiling in the lube base oil range, optional alkylcycloparaffins boiling in the lube base oil range, and the highly paraffinic lube base stock to form a blended lube base oil;
- and
- h) isolating the blended lube base oil.
Dependencies are inferred from the claim text.