US2814594A - Method for producing an improved cutting oil - Google Patents

Method for producing an improved cutting oil Download PDF

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US2814594A
US2814594A US502738A US50273855A US2814594A US 2814594 A US2814594 A US 2814594A US 502738 A US502738 A US 502738A US 50273855 A US50273855 A US 50273855A US 2814594 A US2814594 A US 2814594A
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oil
range
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naphthenic
temperature
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Joseph A Smith
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ExxonMobil Technology and Engineering Co
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Exxon Research and Engineering Co
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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M101/00—Lubricating compositions characterised by the base-material being a mineral or fatty oil
    • C10M101/02—Petroleum fractions
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
    • C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
    • C10M2203/106—Naphthenic fractions
    • C10M2203/1065—Naphthenic fractions used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/28—Esters
    • C10M2207/287—Partial esters
    • C10M2207/289—Partial esters containing free hydroxy groups
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/02—Amines, e.g. polyalkylene polyamines; Quaternary amines
    • C10M2215/04—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to acyclic or cycloaliphatic carbon atoms
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/26—Amines
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
    • C10M2219/02—Sulfur-containing compounds obtained by sulfurisation with sulfur or sulfur-containing compounds
    • C10M2219/024—Sulfur-containing compounds obtained by sulfurisation with sulfur or sulfur-containing compounds of esters, e.g. fats
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
    • C10M2219/04—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions containing sulfur-to-oxygen bonds, i.e. sulfones, sulfoxides
    • C10M2219/044—Sulfonic acids, Derivatives thereof, e.g. neutral salts
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/20—Metal working
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/20—Metal working
    • C10N2040/22—Metal working with essential removal of material, e.g. cutting, grinding or drilling
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2060/00—Chemical after-treatment of the constituents of the lubricating composition
    • C10N2060/02—Reduction, e.g. hydrogenation
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2060/00—Chemical after-treatment of the constituents of the lubricating composition
    • C10N2060/10—Chemical after-treatment of the constituents of the lubricating composition by sulfur or a compound containing sulfur

Definitions

  • Cutting oils are used to perform several important functions in metal working operations. They act to provide lubrication between the tool and the work and also to dissipate heat and thus prevent overheating of either the tool or the work. By reason of these effects they reduce the power consumed, increase the life of the tools, and provide smoother and more perfect surfaces on the work. Numerous different types of compositions have been proposed heretofore for cutting oils. However, they have not been entirely satisfactory in all respects.
  • an improved cutting oil may be produced by sulfonating, sulfurizing and then lime neutralizing and dehydrating a naphthenic-base mineral lubricating oil, the several steps being carried out at relatively low temperatures. More particularly the method of the present invention comprises treating a naphthenic-base mineral lubricating oil with about to 50 pounds of HzSOi/barrel of oil at a temperature in the range of about 70 to 120 F., treating the resultant sulfonated oil with sulfur at a temperature in the range of about 80 to 150 F., until about 0.5 to 1.5% by weight of sulfur, based on the sulfurized product has been added to said sulfonated oil, and neutralizing the resultant sulfonated and sulfurized oil with a basic reacting compound of calcium.
  • the preferred basic reacting compound of calcium is calcium hydroxide.
  • the treated oil is dehydrated, preferably by air blowing, at a temperature in the range of about 150 to 200 F.
  • calcium naphthenates and calcium sulfonates are formed in situ in the lubricating oil.
  • the naphthenic-base mineral lubricating oils useful for the purposes of the present invention have a viscosity in the range of about 100 to 315 SSU at 100 F., and preferably a viscosity in the range of about 175 to 185 SSU at 100 F.
  • the lubricating oils have a naphthenic acid content in the range of about 0.8 to 1.5% by weight and preferably about 0.9 to 1.0% by weight.
  • Such naphthenic base lubricating oils may be obtained as distillates from Mid-Continent and South American crude oils.
  • the first step in the manufacture of the cutting oils of the present invention is sulfonation.
  • the naphthenic-base lubricating oil is treated at a temperature in the range of about 70 to 120 F., preferably 80 to 100 F., with about 10 to 50, and preferably 20 to 30 pounds of H2SO4/b31'l'6l (42 gallons) of oil.
  • Preferably 98% concentrated sulfuric acid is employed although it will be understood that lesser strength sulfuric acids or turning sulfuric acid may be employed if desired.
  • the sulfonation is preferably carried out with ice ing it with about 0.5 to 1.5 wt. percent, preferably about 0.8 to 1.2 wt.
  • the sulfurization may be conveniently accomplished by adding the sulfur to the sulfonated oil and air agitating the mixture for about 5 to 20 hours, preferably about 10 to 12 hours, at a temperature of 80 to F.
  • the sulfonated and sulfurized oil is neutralized with a basic reacting compound of calcium.
  • the preferred calcium compound is calcium hydroxide although it will be understood that calcium oxide or other compounds of calcium may be used if desired.
  • the treated oil is then blown with air or other gaseous material until the oil composition is dehydrated. This air blowing step will generally require about 6 to 10 hours and is carried out at a temperature in the range of about 150 to 200 F., preferably in the range of to 180 F. Dehydration will be indicated by the oil composition changing from a milky appearance to a bright clear oil composition. 7
  • the resultant finished cutting oil of this invention is used as such in cutting operations and is not of the type known as a soluble oil or an emulsifiable oil.
  • conventional additives may be added to the cutting oil of this invention, such as corrosion inhibitors, e. g. propylene diamine, sorbitan monooleate, etc.; extreme pressure agents, e. g. sulfurized sperm oil or sulfurized lard oil; and the like.
  • Lubricant composition of present invention Composition A.-A distillate obtained from a Venezuelan crude oil and having the following properties was used as the naphthenic-base lubricating oil for preparing this composition:
  • I carried out at a temperature in the range of 110 to 120 -180 F. until bright.
  • composition B (B.--A distillate obtained from a Venezuelan crude oil and having the following properties was employed as a naphthenic-base lubricating oil to prepare this composition:
  • the above-described naphthenic-base lubricating oil was mixed with 1.2% by weight of sulfur and the mixture was air agitated for hours to thoroughly incorporate this sulfur into the oil. This sulfurization was carried out at a temperature in the range of l10-l20 F.
  • composition C --A distillate obtained from a Venezuelan crude oil and having the same properties as the distillate used to prepare composition A was employed as the naphthenic-base lubricating oil to prepare this composition.
  • the naphtheniobase lubricant was acid treated and sulfurized under conditions identical to those described for composition A.
  • the resultant sulfonated and sulfurized product in this case was then neutralized with a Baum solution of sodium hydroxide after which the oil was heated to 170-180" F. and washed with water to remove sodium naphthenates and sodium sulfonates therefrom. Thereafter the composition was blown with air for 8 hours at 170-180 F.
  • the three lubricant compositions described above were then evaluated for cutting performance in the Almen machine shock test, which test is employed to evaluate the relative cutting characteristics of cutting oils.
  • This test is carried out as follows: Shock tests are usually run on oils which carry the full load of 15 wts., gradual loading.
  • the Almen machine is set up with a new pin and bushings for each run with the test lubricant in the holder. The machine is operated without a load for a 30'second break-in. Prior to the 30-second break'in, a number of the two pound weights are placed on the lever loading area and are held up by hand so that no load is on the bearing. As soon as the 30-second break-in period is completed, the entire load is lowered on the test piece and allowed to run for 10 seconds. Individual runs are continued with new pin and bushings and with increasing loads until the maximum load is reached which will not cause failure of the pin.
  • composition A the cutting oil of the present invention
  • composition B and C the other two lubricant compositions
  • Composition D This composition was prepared in accordance with this invention.
  • the naphthenic-base lubricating oil was treated with two dumps of 15 pounds (per barrel of oil) each of 98% H2504 followed by 1.5 hours of air agitation and 16 hours of settling.
  • the acid sludge settling out was removed.
  • 0.8% by weight of sulfur was added to the sulfonated oil and the mixture was air agitated for 12 hours at about F. to thoroughly incorporate the sulfur into the oil.
  • the resultant sulfonated and sulfurized product was then neutralized with calcium hydroxide and the neutralized product was blown with air at a temperature of about 170 F. for 6 hours.
  • composition E The naphthenic-base lubricating oil in this case was sulfonated, neutralized and air blown in the same manner as was composition D, but the sulfurization step was omitted. This composition was thus not prepared in accordance with the present invention.
  • composition D The cutting oil produced in accordance with the present invention
  • composition E the other lubricant composition
  • composition E the other lubricant composition
  • the cutting performance of composition D is better than several commercially available sulfurized cutting oils of higher sulfur content.
  • Composition D has also been found to be more stable at low temperatures than these high sulfur content commercially available cutting oils, thereby eliminating undesirable sulfur separation.
  • the viscosity of the treated oils (compositions D and E) are higher than the original naphthenic-base oil. This advantage is unexpected since generally when a lubricating oil distillate is acid treated its viscosity after acid treatment is lower. However, due to the low temperature acid treatment of the present invention, the viscosity increases rather than decreases.
  • a method for producing an improved cutting oil which comprises treating a naphthenic-base mineral lubrieating oil containing in the range of about 0.8 to 1.5% by weight of naphthenic acids with about 10 to 50 pounds of HzSOr/barrel of oil at a temperature in the range of about 70 to F., treating the resultant sulfonated oil with about 0.5 to 1.5% by weight of sulfur, based on the resultant sulfurized product, at a temperature in the range of about 80 to F., neutralizing the resultant sulfonated and sulfurized oil with a basic reacting compound of calcium, and dehydrating the resultant neutralized product at a temperature in the range of about 150 to 200 F.
  • a method for producing an improved cutting oil which comprises treating a naphthenic base mineral lubricating oil containing 0.9 to 1.0% by weight of naphthenic acids with about 20 to 30 pounds of HzSOr/barrel of oil at a temperature in the range of about to F., 5.

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  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Lubricants (AREA)

Description

United States Patent PRODUCING AN IMPROVED CUTTING OIL Joseph A. Smith, Baltimore, Md., assignor to Esso Research and Engineering Company, a corporation of Delaware No Drawing. Application April 20,1955, Serial No. 502,738
5 Claims. (Cl. 252-331) METHOD FOR This invention relates to a metal working lubricant and more particularly relates to the method for making the same. Still more particularly the invention relates to a method for producing an improved cutting oil by .sulfonating, sulfurizing and then lime neutralizing and dehydrating a naphthenic-base mineral lubricating oil.
Cutting oils are used to perform several important functions in metal working operations. They act to provide lubrication between the tool and the work and also to dissipate heat and thus prevent overheating of either the tool or the work. By reason of these effects they reduce the power consumed, increase the life of the tools, and provide smoother and more perfect surfaces on the work. Numerous different types of compositions have been proposed heretofore for cutting oils. However, they have not been entirely satisfactory in all respects.
It has now been found that an improved cutting oil may be produced by sulfonating, sulfurizing and then lime neutralizing and dehydrating a naphthenic-base mineral lubricating oil, the several steps being carried out at relatively low temperatures. More particularly the method of the present invention comprises treating a naphthenic-base mineral lubricating oil with about to 50 pounds of HzSOi/barrel of oil at a temperature in the range of about 70 to 120 F., treating the resultant sulfonated oil with sulfur at a temperature in the range of about 80 to 150 F., until about 0.5 to 1.5% by weight of sulfur, based on the sulfurized product has been added to said sulfonated oil, and neutralizing the resultant sulfonated and sulfurized oil with a basic reacting compound of calcium. The preferred basic reacting compound of calcium is calcium hydroxide. After the neutralization step the treated oil is dehydrated, preferably by air blowing, at a temperature in the range of about 150 to 200 F. In the method of the present invention calcium naphthenates and calcium sulfonates are formed in situ in the lubricating oil.
The naphthenic-base mineral lubricating oils useful for the purposes of the present invention have a viscosity in the range of about 100 to 315 SSU at 100 F., and preferably a viscosity in the range of about 175 to 185 SSU at 100 F. In addition the lubricating oils have a naphthenic acid content in the range of about 0.8 to 1.5% by weight and preferably about 0.9 to 1.0% by weight. Such naphthenic base lubricating oils may be obtained as distillates from Mid-Continent and South American crude oils.
The first step in the manufacture of the cutting oils of the present invention is sulfonation. In this step the naphthenic-base lubricating oil is treated at a temperature in the range of about 70 to 120 F., preferably 80 to 100 F., with about 10 to 50, and preferably 20 to 30 pounds of H2SO4/b31'l'6l (42 gallons) of oil. Preferably 98% concentrated sulfuric acid is employed although it will be understood that lesser strength sulfuric acids or turning sulfuric acid may be employed if desired. The sulfonation is preferably carried out with ice ing it with about 0.5 to 1.5 wt. percent, preferably about 0.8 to 1.2 wt. percent, of sulfur at a temperature in the range of about to 150 F., preferably to F. The sulfurization may be conveniently accomplished by adding the sulfur to the sulfonated oil and air agitating the mixture for about 5 to 20 hours, preferably about 10 to 12 hours, at a temperature of 80 to F.
Thereafter the sulfonated and sulfurized oil is neutralized with a basic reacting compound of calcium. The preferred calcium compound is calcium hydroxide although it will be understood that calcium oxide or other compounds of calcium may be used if desired. The treated oil is then blown with air or other gaseous material until the oil composition is dehydrated. This air blowing step will generally require about 6 to 10 hours and is carried out at a temperature in the range of about 150 to 200 F., preferably in the range of to 180 F. Dehydration will be indicated by the oil composition changing from a milky appearance to a bright clear oil composition. 7 The resultant finished cutting oil of this invention is used as such in cutting operations and is not of the type known as a soluble oil or an emulsifiable oil. It will be understood that, if desired, conventional additives may be added to the cutting oil of this invention, such as corrosion inhibitors, e. g. propylene diamine, sorbitan monooleate, etc.; extreme pressure agents, e. g. sulfurized sperm oil or sulfurized lard oil; and the like.
The following examples are intended to set forth the invention in greater detail as well as to show the superiority of the present cutting oil over other lubricant compositions:
EXAMPLE I Three different lubricant compositions were prepared as follows:
Lubricant composition of present invention Composition A.-A distillate obtained from a Venezuelan crude oil and having the following properties was used as the naphthenic-base lubricating oil for preparing this composition:
Property:
Naphthenic acids, wt. percent 0.924 Viscosity, SSU at 100 F 180.3 API gravity 21.3 Neutralization No 2.08
I carried out at a temperature in the range of 110 to 120 -180 F. until bright.
Other lubricant compositions Composition B.--A distillate obtained from a Venezuelan crude oil and having the following properties was employed as a naphthenic-base lubricating oil to prepare this composition:
Property:
Naphthenic acids, wt. percent 0.995 Viscosity, SSU at 100 F 158 API gravity 21.9 Neutralization No 2.24
The above-described naphthenic-base lubricating oil was mixed with 1.2% by weight of sulfur and the mixture was air agitated for hours to thoroughly incorporate this sulfur into the oil. This sulfurization was carried out at a temperature in the range of l10-l20 F.
Composition C.--A distillate obtained from a Venezuelan crude oil and having the same properties as the distillate used to prepare composition A was employed as the naphthenic-base lubricating oil to prepare this composition. The naphtheniobase lubricant was acid treated and sulfurized under conditions identical to those described for composition A. The resultant sulfonated and sulfurized product in this case however was then neutralized with a Baum solution of sodium hydroxide after which the oil was heated to 170-180" F. and washed with water to remove sodium naphthenates and sodium sulfonates therefrom. Thereafter the composition was blown with air for 8 hours at 170-180 F.
The three lubricant compositions described above were then evaluated for cutting performance in the Almen machine shock test, which test is employed to evaluate the relative cutting characteristics of cutting oils. This test is carried out as follows: Shock tests are usually run on oils which carry the full load of 15 wts., gradual loading. In carrying out the shock test, the Almen machine is set up with a new pin and bushings for each run with the test lubricant in the holder. The machine is operated without a load for a 30'second break-in. Prior to the 30-second break'in, a number of the two pound weights are placed on the lever loading area and are held up by hand so that no load is on the bearing. As soon as the 30-second break-in period is completed, the entire load is lowered on the test piece and allowed to run for 10 seconds. Individual runs are continued with new pin and bushings and with increasing loads until the maximum load is reached which will not cause failure of the pin.
The following results were obtained in the Almen machine shock test:
Almen weights carried Composition (shock loading) 1 Composition of present invention.
It will readily be seen that the cutting oil of the present invention (composition A) demonstrated superior performance in this test as compared to the other two lubricant compositions (compositions B and C).
EXAMPLE II A distillate obtained from a Venezuelan crude oil and having the following properties was employed as the This naphthenic-base lubricating oil was employed to prepare the following two compositions:
Composition D.This composition was prepared in accordance with this invention. The naphthenic-base lubricating oil was treated with two dumps of 15 pounds (per barrel of oil) each of 98% H2504 followed by 1.5 hours of air agitation and 16 hours of settling. The acid sludge settling out was removed. Thereafter 0.8% by weight of sulfur was added to the sulfonated oil and the mixture was air agitated for 12 hours at about F. to thoroughly incorporate the sulfur into the oil. The resultant sulfonated and sulfurized product was then neutralized with calcium hydroxide and the neutralized product was blown with air at a temperature of about 170 F. for 6 hours.
Composition E.-The naphthenic-base lubricating oil in this case was sulfonated, neutralized and air blown in the same manner as was composition D, but the sulfurization step was omitted. This composition was thus not prepared in accordance with the present invention.
The two above-described lubricant compositions had the following properties and gave the following results in the Almen machine test:
1 Composition of present invention.
2 Defined as sulfur reacting with powdered copper.
The cutting oil produced in accordance with the present invention (composition D) is substantially superior in the Almen machine test to the other lubricant composition (composition E). in addition, it has been found that the cutting performance of composition D is better than several commercially available sulfurized cutting oils of higher sulfur content. Composition D has also been found to be more stable at low temperatures than these high sulfur content commercially available cutting oils, thereby eliminating undesirable sulfur separation. It will also be noted that the viscosity of the treated oils (compositions D and E) are higher than the original naphthenic-base oil. This advantage is unexpected since generally when a lubricating oil distillate is acid treated its viscosity after acid treatment is lower. However, due to the low temperature acid treatment of the present invention, the viscosity increases rather than decreases.
What is claimed is:
l. A method for producing an improved cutting oil which comprises treating a naphthenic-base mineral lubrieating oil containing in the range of about 0.8 to 1.5% by weight of naphthenic acids with about 10 to 50 pounds of HzSOr/barrel of oil at a temperature in the range of about 70 to F., treating the resultant sulfonated oil with about 0.5 to 1.5% by weight of sulfur, based on the resultant sulfurized product, at a temperature in the range of about 80 to F., neutralizing the resultant sulfonated and sulfurized oil with a basic reacting compound of calcium, and dehydrating the resultant neutralized product at a temperature in the range of about 150 to 200 F.
2. Method according to claim 1 wherein said basic reacting compound of calcium is calcium hydroxide.
3. Method according to claim 1 wherein said dehydrating step is carried out by blowing said neutralized product with air.
4. A method for producing an improved cutting oil which comprises treating a naphthenic base mineral lubricating oil containing 0.9 to 1.0% by weight of naphthenic acids with about 20 to 30 pounds of HzSOr/barrel of oil at a temperature in the range of about to F., 5. A cutting oil prepared according to the method of treating the resultant sulfonated oil with about 0.8 to claim 1.
1.2% by weight of sulfur, based on the resultant sulfurized product, at a temperature in the range of about References Cited in the file of this Patent 100 to F., neutralizing the resultant sulfonated and 5 UNITED STATES PATENTS sulfurized oil with calcium hydroxide, and blowing the resultant neutralized product with air at a temperature 2367470 Neely et 1945 2 392 891 Wallace et al Ian. 15 1946 1n the range of about to F. until the product is substantially dehydrated. McNab et a1 P 1947

Claims (1)

1. A METHOD FOR PRODUCING AN IMPROVED CUTTING OIL WHICH COMPRISES TREATING A NAPHTHENIC-BASE MINERAL LUBRICATING OIL CONTAINING IN THE RANGE OF ABOUT 0.8 TO 1.5%% BY WEIGHT OF NAPHTHENIC ACIDS WITH ABOUT 10 TO 50 POUNDS OF H2SO4/BARREL OF OIL AT A TEMPERATURE IN THE RANGE OF ABOUT 70* TO 120*F., TREATING THE RESULTANT SULFONATED OIL WITH ABOUT 0.5 TO 1.5% BY WEIGHT OF SULFUR, BASED ON THE RESULTANT SULFURIZED PRODUCT, AT A TEMPERATURE IN THE RANGE OF ABOUT 80* TO 150*F., NEUTRALIZING THE RESULTANT SULFONATED AND SULFURIZED OIL WITH A BASIC REACTING COMPOUND OF CALCIUM, AND DEHYDRATING THE RESULTANT NEUTRALIZED PRODUCT AT A TEMPERATURE IN THE RANGE OF ABOUT 150* TO 200*F.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3388062A (en) * 1967-01-27 1968-06-11 Lockheed Aircraft Corp Cutting fluids for machining and/or working of titanium and its alloys
US3625894A (en) * 1967-05-13 1971-12-07 Hoechst Ag Anticorrosive for lubricants

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2367470A (en) * 1939-06-20 1945-01-16 Standard Oil Co California Compounded oil
US2392891A (en) * 1943-09-30 1946-01-15 Standard Oil Co Stable sulphurized oils and the method of preparing same
US2418894A (en) * 1944-12-09 1947-04-15 Standard Oil Dev Co Compounded lubricating oil

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2367470A (en) * 1939-06-20 1945-01-16 Standard Oil Co California Compounded oil
US2392891A (en) * 1943-09-30 1946-01-15 Standard Oil Co Stable sulphurized oils and the method of preparing same
US2418894A (en) * 1944-12-09 1947-04-15 Standard Oil Dev Co Compounded lubricating oil

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3388062A (en) * 1967-01-27 1968-06-11 Lockheed Aircraft Corp Cutting fluids for machining and/or working of titanium and its alloys
US3625894A (en) * 1967-05-13 1971-12-07 Hoechst Ag Anticorrosive for lubricants

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