US2124628A - Process for manufacturing lubricants - Google Patents

Description

Passed July as, was

UNITED STATES PATENT OFFICE i PROCESS FOR MANUFACTURING LUBRICANTS Fran: Rudolf Moser, Amsterdam, Netherlands, assignor to Shell Development. Company, San 'FranciscmCaliL, a'corporation of Delaware No Drawmg.

cation March 21,1935, Se-

Anv rial No. 12,247. In the Netherlands March 26,

1934 8 Claims.

The invention relates to a process for manufacturing lubricants, such as mineral lubricating carboxylic acids are much more suitable for the object in view and moreover frequently have still other properties which are of importance in ap- 18 plying the lubricants. Thus, for instance. it has been foundthat in the case of lubricating oils for cylinders of aero-engines the presence of polycarboxylic acids in these oils results .in an appreciably reduced attack of the piston and the 20 cylinder wall through rust-formation.

As higher molecular polycarbomiic acids there may be considered both substituted, e. g. containing groups of hydroxyls or esters, and nonsubstituted saturated or unsaturated acids. It is as essential, however, that more than one tree carboxyl group is present.

- Suitable poiycarboxylic acids are for instance those obtained by a condensation reaction of oleflnes with maleic acid, anhydride, which reso action is related to them described by Diehls and Alder, Ann. 460, page 98 (i928) Ber. 62,

.pagelifi (1929) and Ann. 470, page 62, (1929).

and of which the following is a typical example:

200 grams of a highly cracked hydrocarbon 35 distillate boiling from 150 to 200 0. obtained by cracking paraflln wax in the vapor phase and haying a bromine number or 116 is heated with 140 grams maleic acid anhydride during 14 hours at 150460 0. and then for '30 hours at zoo-230 40 6., whereafter it is fractionated under a vacuum of 13 'mm. mercury. .146 grams of a fraction 'boiling from 155 to "165 C. are subsequently hydrated by boiling-for 2 hours with 500 milliliters of water to produce the free acid. Upon extrac 4,5 tion with ether an extract amounting to 155 grams oflish'tyellow acid-reacting viscous oil is obtained. w

When adding .25 to this acidto aminferallubricatingoibtheresultingblendedoilis capable of eifectively preventing corrosion of internal combustion engines, whether such engines have been in use or not.

Another suitable acid is agaric or l-cetyl citric acid (Chem. Abst. 25, page 1213, 1931). 5

Further examples are polycarboxylic acids obtained by polymerization, e. g., by heating and/or boiling, voltolizing, etc), of fatty acids, or acids produced from polymerized fats by hydrolyzing, or saponifying same and liberating the acids m from the soap.

The added quantities of polycarboxylic acids are, as a rule, comparatively small, e. g. less than 5%, in many cases even below 1%.

Example I The addition of 0.5% voltolized oleic acid to a mineral lubricating oil, either compounded or not, is suflicient to obtain the above efiect when using the oil as lubricant for cylinders of aeroengines.

Example I! A technical quick-drying oil, upon the soapsolution obtained being saponifled and acidified, yieldsa polycarboxylic acid-containing product 5 which when added in a quantity of 1% to a mineral lubricating oil has the property of preventing rust-formation in acre-engine cylinders.

I claim: a

l. A lubricant capable of reducing corrosion in internal combustion engines, consisting essentially of a mineral lubricating 011 containing as an active anticorrosion ingredient a small quan-' tity of a polycarboxylic acid obtained by condensatio'n of maleic acid anhydride and oleflnes.

V 2. A lubricant capable of reducing corrosion in internal combustion engines consisting essentially of a mineral lubricating oil containing as an active anti-corrosion ingredient less than 5% of a polycarboxylic acid obtained by condensation of maleic acid anhydride and an oleflne.

3. A lubricant capable of reducing corrosion in internal combustion engines consisting essentially of a mineral lubricating oil containing as an active anti corrosion ingredient less than 1% -of a polycarboxylic acid obtained by condensation ofmaleic acid anhydrlde and an oleflne.

FRANZ RUDOLF MOBER.