US 4,744,921 AGranted

Methods for preparing, group II metal overbased sulfurized alkylphenols

AssigneeChevron Research Company

InventorThomas V. Liston

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Abstract

The present invention is directed toward a method for preparing Group II metal overbased sulfurized alkylphenols. In particular, the present invention employs a sulfurization catalyst in the preparation of Group II metal overbased sulfurized alkylphenols. Use of a sulfurization catalyst in this preparation results in a product generally characterized as having lower crude sediment, a higher Total Base Number and lower viscosity than a similar product prepared without using a sulfurization catalyst.

Claims11

Dependent claims

A method for preparing Group II metal overbased sulfurized alkylphenols which comprises the steps:

(a) combining into an inert hydrocarbon diluent an alkylphenol wherein the alkyl group contains a sufficient number of carbon atoms to render oil-soluble the resulting Group II metal overbased sulfurized alkylphenol, an oil-soluble Group II metal overbased natural or synthetic hydrocarbyl sulfonate, a sulfurization catalyst, and an alkanol of at least 8 carbon atoms;
wherein the oil-soluble Group II metal overbased natural or synthetic hydrocarbyl sulfonate is employed at from about 1 to 20 weight percent to the alkylphenol;
the sulfurization catalyst is employed at from about 0.5 to 10 weight percent to the alkylphenol, and the alkanol of at least 8 carbon atoms is employed at a molar ratio to the alkylphenol of from about 0.5 to about 5;
(b) heating the system to a temperature of from about 90.degree. C. to about 155.degree. C.;
(c) combining into the reaction system a Group II metal oxide, hydroxide or C.sub.1 -C.sub.6 alkoxide and sulfur at a temperature sufficient to effect sulfurization of the alkylphenol followed by addition at from about 145.degree. C. to about 165.degree. C. of a C.sub.2 -C.sub.4 alkylene glycol wherein the Group II metal oxide, hydroxide or C.sub.1 -C.sub.6 alkoxide is employed at a molar ratio to the alkylphenol of from about 1 to about 4, sulfur is employed at a molar ratio to the alkylphenol of from about 1.5 to about 4, the C.sub.2 -C.sub.4 alkylene glycol is employed at a molar ratio to the alkylphenol of from about 1 to about 4;
(d) heating at a temperature sufficient to effect removal of a portion of the water in the system;
(e) heating the system to a temperature of from about 160.degree. C. to about 190.degree. C.;
(f) combining into the reaction system carbon dioxide wherein carbon dioxide is employed at a molar charge to the alkylphenol of from about 1 to 3;
and
(g) heating the system under reduced pressure at a temperature and pressure sufficient to remove a portion of the water, C.sub.2 -C.sub.4 alkylene glycol and the unreacted carbon dioxide.

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Dependencies are inferred from the claim text.

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Abstract

A method for preparing Group II metal overbased sulfurized alkylphenols which comprises the steps:

(a) combining into an inert hydrocarbon diluent an alkylphenol wherein the alkyl group contains a sufficient number of carbon atoms to render oil-soluble the resulting Group II metal overbased sulfurized alkylphenol, an oil-soluble Group II metal overbased natural or synthetic hydrocarbyl sulfonate, a sulfurization catalyst, and an alkanol of at least 8 carbon atoms;
wherein the oil-soluble Group II metal overbased natural or synthetic hydrocarbyl sulfonate is employed at from about 1 to 20 weight percent to the alkylphenol;
the sulfurization catalyst is employed at from about 0.5 to 10 weight percent to the alkylphenol, and the alkanol of at least 8 carbon atoms is employed at a molar ratio to the alkylphenol of from about 0.5 to about 5;
(b) heating the system to a temperature of from about 90.degree. C. to about 155.degree. C.;
(c) combining into the reaction system a Group II metal oxide, hydroxide or C.sub.1 -C.sub.6 alkoxide and sulfur at a temperature sufficient to effect sulfurization of the alkylphenol followed by addition at from about 145.degree. C. to about 165.degree. C. of a C.sub.2 -C.sub.4 alkylene glycol wherein the Group II metal oxide, hydroxide or C.sub.1 -C.sub.6 alkoxide is employed at a molar ratio to the alkylphenol of from about 1 to about 4, sulfur is employed at a molar ratio to the alkylphenol of from about 1.5 to about 4, the C.sub.2 -C.sub.4 alkylene glycol is employed at a molar ratio to the alkylphenol of from about 1 to about 4;
(d) heating at a temperature sufficient to effect removal of a portion of the water in the system;
(e) heating the system to a temperature of from about 160.degree. C. to about 190.degree. C.;
(f) combining into the reaction system carbon dioxide wherein carbon dioxide is employed at a molar charge to the alkylphenol of from about 1 to 3;
and
(g) heating the system under reduced pressure at a temperature and pressure sufficient to remove a portion of the water, C.sub.2 -C.sub.4 alkylene glycol and the unreacted carbon dioxide.

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