US2485204A - Novel process for soap purifying - Google Patents

Novel process for soap purifying Download PDF

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Publication number
US2485204A
US2485204A US672082A US67208246A US2485204A US 2485204 A US2485204 A US 2485204A US 672082 A US672082 A US 672082A US 67208246 A US67208246 A US 67208246A US 2485204 A US2485204 A US 2485204A
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United States
Prior art keywords
soap
concentration
solution
washing
continuous
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Expired - Lifetime
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US672082A
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English (en)
Inventor
Lachampt Felix Lucien
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Union Francaise Commerciale et Industrielle
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Union Francaise Commerciale Et Industrielle Sa
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    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D13/00—Making of soap or soap solutions in general; Apparatus therefor
    • C11D13/02—Boiling soap; Refining
    • C11D13/04—Continuous methods therefor

Definitions

  • Said saltin out operation is based on the fact that, by adding to a dilute solution of soap an electrolyte in sufiicient quantity, the homogeneousness of the solution is destroyed and the solution first ,becomes cloudy and then segregates somewhat slowly into two layers, one of which, the upper layer, comprises practically the totality of the soap, and is poor in electrolyte, while the lower layer contains but little soap and a large proportion of the electrolyte, together with the glycerol which thus is segregated and may be reclaimed.
  • This operation consists of adding water to the soap in such quantity that a certain amount thereof will become dissolved in the lower lye.
  • a new balance or state of equilibrium is thus obtained; on one hand, soap in the state of a concentrated liquid phase and, on the other hand, a salty solution of the soap called nigre; in this balance, the upper portion is rich in soap and has become poorer in salts, which have migrated to the lower portion or nigre, which is poorer in soap. But, the abov segregation only proceeds slowly.
  • This invention has for its object to substitute for the salting out process a rapid separation process carried out by starting, not from a dilute solution, but rather from a soap obtained in the liquid phase thereof in which said concentration is the highest.
  • This phase being sometimes termed the neat phase. 1 Y v .
  • the novel process accordin to the invention The thus makes it possible to utilize an alkaline soap directly without it being necessary to carry out the usual liquidation step.
  • the purifying process which is an object of the invention, comprises a series of washing operations preferably carried out in counter current stages and at a temperature approximating C. on the soap in the neat phase by means of electrolytic solutions, the concentration of which preferably is higher than the critical concentration.
  • electrolytic solutions the concentration of which preferably is higher than the critical concentration.
  • the lower alkaline lye which has exhausted or drained the salt from the soap solution, may be used for preparing the saponifying lye.
  • the strongly alkaline soap thus obtained is finally processed by a fast-actin saponifying fat such as cocoanut, and the like, by a fatty acid or a buffer mixture or a silica gel or any other product or mixture capable of neutralizing the free sodium hydrate while allowing a final soap product of suitable grade to be obtained.
  • a fast-actin saponifying fat such as cocoanut, and the like
  • a fatty acid or a buffer mixture or a silica gel or any other product or mixture capable of neutralizing the free sodium hydrate while allowing a final soap product of suitable grade to be obtained Such addition of fatty acid may be completed by a further addition of another fatty or non fatty acid or of any other product enabling a suitable soap to be obtained, so that, at the discharge end of the machine, the soap has a concentration making any further drying unnecessary, and may at once be milled, molded and formed or subjected to any other treatment which may be required for the production of a commercial soap.
  • the soap such as tallow soap for example
  • the soap is discharged at 100 C. from the saponifying apparatus in the state of neat soap having 63% of soap.
  • the product is washed with a brine having a concentration slightly above the critical concentration such as, for instance, 12% sea-water salt for a volume of lye equal to the volume of soap.
  • the critical concentration is not only variable according to the state of the soap and the glycerol content thereof, but also depends on the respective proportions of soap and lye.
  • the washing operation is carried out in three counter current stages in an apparatus which is schematically illustrated in the single figure of the annexed drawing. All
  • washing Operations are effected at a constant temperature such as 99 0., for example.
  • the neat soap containing glycerol enters the machine at A.
  • the glycerol is eliminated therefrom at B after the feed has travelled along a path indicated in the drawing by arrows drawn in full lines.
  • the brine is fed into the apparabus at C and is discharged therefrom at D after having become loaded with glycerol during its travel along the path indicated by arrows in dashes.
  • the soap at B washed but containing salt, is then subjected to an ultimate wash by means of a 10% NaOI-I solution fed at F.
  • the alkaline soap is conducted to H while the alkaline lye is discharged at G after having travelled along the path indicated in the drawing by arrows in dotted lines, into a storage tank, not shown, where it will ultimately serve to prepare the saponifying lye.
  • the alkaline soap collected at H is mixed with a fatty acid, which neutralises the excess sodium hydrate. Said fatty acid is contained in a tank I.
  • the finished soap product in neutral and concentrated condition is discharged at J, ready to be converted into commercial soap.
  • each of these stages comprises a tank such as r0, r1, 12, and r3.
  • the brine solution is introduced while into the tank re the sodium hydroxide is introduced.
  • the mixers such as 1m, m1, m2, and me which insure proper contacts between the washing lye and the soap.
  • a static separator such as so, s1, s2, and s3 wherein there occurs continuous settling and separation of the washing lyes and the soap.
  • Volumetric pumps not shown in the drawing, provide for the proper proportioning of the reagents and the circulation of the liquids.
  • washing stages could be varied and each of said stages could be organized in a different manner from that shown without exceeding the scope of the invention, provided continuous counter current methodical washing of the soap in a concentrated liquid phase is carried out.
  • a process for the purification of soap in accordance with claim 1 in which the first washing with the aid of sodium chloride is followed by a second continuous washing with a solution of sodium hydroxide, said last named washing solution having a-concentration closely above the concentration below which-the soap may be dissolved.

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Detergent Compositions (AREA)
US672082A 1943-07-31 1946-05-24 Novel process for soap purifying Expired - Lifetime US2485204A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR946742 1943-07-31

Publications (1)

Publication Number Publication Date
US2485204A true US2485204A (en) 1949-10-18

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ID=8811851

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US672082A Expired - Lifetime US2485204A (en) 1943-07-31 1946-05-24 Novel process for soap purifying

Country Status (8)

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US (1) US2485204A (en))
BE (1) BE463094A (en))
CH (1) CH259128A (en))
FR (1) FR946742A (en))
GB (1) GB636945A (en))
LU (1) LU28412A1 (en))
MY (1) MY5300008A (en))
NL (1) NL94073C (en))

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2653958A (en) * 1948-07-17 1953-09-29 Union Francais Commerciale Et Method for the continuous purification of soap
DE1069319B (en)) * 1959-11-19

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3047995B1 (fr) 2016-02-19 2020-01-03 Rampal Patou Procede de fabrication de savon

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2179001A (en) * 1937-06-14 1939-11-07 Refining Inc Process for the continuous recovery of glycering from soap
US2300751A (en) * 1941-11-04 1942-11-03 Sharples Corp Manufacture of soap
US2300749A (en) * 1939-06-29 1942-11-03 Sharples Corp Manufacture of soap
US2319929A (en) * 1940-11-22 1943-05-25 Armour & Co Treating natural oils and fats

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2179001A (en) * 1937-06-14 1939-11-07 Refining Inc Process for the continuous recovery of glycering from soap
US2300749A (en) * 1939-06-29 1942-11-03 Sharples Corp Manufacture of soap
US2319929A (en) * 1940-11-22 1943-05-25 Armour & Co Treating natural oils and fats
US2300751A (en) * 1941-11-04 1942-11-03 Sharples Corp Manufacture of soap

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1069319B (en)) * 1959-11-19
US2653958A (en) * 1948-07-17 1953-09-29 Union Francais Commerciale Et Method for the continuous purification of soap

Also Published As

Publication number Publication date
MY5300008A (en) 1953-12-31
CH259128A (fr) 1949-01-15
GB636945A (en) 1950-05-10
FR946742A (fr) 1949-06-13
NL94073C (en))
LU28412A1 (en))
BE463094A (en))

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