JP2001049288A - Fatty acid potassium salt solution and its preparation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a fatty acid potassium salt solution which is excellent in productivity and economy and enables the separation of methanol after the saponification to be efficiently carried out by reacting a fatty acid alcohol ester with potassium hydroxide in the presence of propylene glycol. SOLUTION: Palm oil fatty acid methyl ester, coconut oil fatty acid methyl ester, methyl laurate, methyl myristate, and methyl palmitate are preferable as a fatty acid lower alcohol. Potassium hydroxide is used in the form of a solution. The reaction is conducted under normal pressure at 85 to 95 deg.C. The concentration of propylene glycol is preferably 15 to 50 wt.%. After the saponification, the reaction product is subjected to aging and topping followed by the adjustment of water content, giving the objective solution. The final concentration of the solution is preferably 50 to 75 wt.%. The solution viscosity is adjusted to 40 to 100 cP/50 deg.C. The solution is suitable as a material for liquid soap (body soap) and solid soap.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a solution of a metal salt of a fatty acid potassium and a method for producing the same.

[0002]

2. Description of the Related Art In general, soap (composition) is prepared by using a natural fat or the like as a raw material, saponifying it with an alkali to form a soap base (neat soap) composed of a fatty acid salt, and adding a fragrance, Blend additive components such as glycerin, knead,
It is manufactured by extruding and stamping.

[0003] Fatty acid salts used as the above-mentioned soap base materials have conventionally been obtained by transesterifying animal and vegetable oils such as beef tallow, palm oil, soybean oil, cottonseed oil, and coconut oil with lower alcohols, and saponifying the lower alcohol esters of the obtained fatty acids. It is manufactured by an ester saponification method. For example, JP-A-4-117497
In the publication, a method of producing a fatty acid Na salt having a specific composition by reacting a fatty acid methyl ester with sodium hydroxide (NaOH) is disclosed. Also, Japanese Patent Laid-Open No. 6-415
No. 78 discloses a method for producing a fatty acid ester, and a method for producing a soap using the fatty acid ester. The method for producing a soap comprises saponifying a fatty acid methyl ester with an alkali metal hydroxide. Manufacture soap base material,
It is disclosed that propylene glycol (PG) and other components are added to the mixture and the mixture is stamped to produce the composition.

[0004] However, the above-mentioned ester saponification method and the methods disclosed in the above publications are not efficient in separating methanol after saponification, and the production efficiency and economic efficiency are still unsatisfactory. It is a solid at room temperature (100 ° C. or lower) and has a problem that it is difficult to handle even at 100 ° C. or higher because of a high viscosity slurry. Also, propylene glycol (PG) disclosed in the above-mentioned JP-A-6-41578 is added as a humectant or the like after the production of the fatty acid potassium salt, and has a technical idea different from that of the present invention.

On the other hand, in the method of directly saponifying a lower alcohol ester of a fatty acid and potassium hydroxide, solidification occurs during the reaction, resulting in a non-uniform state. As a result, the conversion is 80% or less, and the unreacted ester There is a problem that it is difficult to directly saponify because of the remaining amount.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has been made to solve the problem. It is an object of the present invention to provide a fatty acid potassium salt solution which can be produced and a method for producing the same.

[0007]

Means for Solving the Problems The inventors of the present invention have made intensive studies to solve the above-mentioned conventional problems and the like. As a result, a lower alcohol ester of a fatty acid is reacted with potassium hydroxide in the presence of a specific compound. As a result, they have found that the above-mentioned solution of the fatty acid potassium salt and the method for producing the same can be obtained, and have completed the present invention. That is, the present invention resides in the following (1) and (2). (1) A method for producing a fatty acid potassium salt solution, comprising reacting a fatty acid lower alcohol ester with potassium hydroxide in the presence of propylene glycol (PG) to obtain a fluid fatty acid potassium salt solution. (2) A fluid fatty acid potassium salt solution obtained by the production method according to the above (1).

[0008]

Embodiments of the present invention will be described below in detail. The method for producing a fatty acid potassium salt solution of the present invention is characterized in that a fatty acid lower alcohol ester and potassium hydroxide are reacted in the presence of propylene glycol (PG) to obtain a fluid fatty acid potassium salt solution. It is.

The lower alcohol esters of fatty acids used in the present invention are obtained by subjecting fats and oils such as animal oils and vegetable oils to a transesterification reaction with a lower alcohol and separating glycerin by-produced from the resulting transesterification reaction product. It is obtained. As fats and oils, for example, animal oils such as beef tallow, lard, or palm oil, palm kernel oil, coconut oil, olive oil, soybean oil, cottonseed oil, rapeseed oil, camellia oil,
Vegetable oils such as kapok oil, bran oil, corn oil, sesame oil, safflower oil, tall oil, peanut oil, sunflower oil, and grape seed oil are used. These may be used alone or in combination of two or more. Preferred oils and fats are palm oil and coconut oil. As the lower alcohol, an alcohol having 1 to 6 carbon atoms is used, and preferably, methanol is used. The transesterification reaction and the like can be carried out by a conventional method. Preferred lower alcohol esters of fatty acids include palm oil, palm oil fatty acid methyl ester, and palm oil fatty acid methyl ester obtained from palm oil and coconut oil because they contain a large amount of carbon 14 (C ₁₄ ) components which are good in foaming and have a low amount of unsaturated fatty acids. Esters or methyl laurate, methyl myristate, methyl palmitate are preferred.

Potassium hydroxide (KOH) used in the present invention
Is used as a potassium hydroxide solution. In the present invention, propylene glycol (PG) is used as a hydrotrope agent, and can directly saponify the fatty acid lower alcohol ester and potassium hydroxide in the presence of the PG. Become. In the case where PG is not present, when a fatty acid lower alcohol ester and potassium hydroxide are directly saponified,
Solidification occurs during the reaction, resulting in a non-uniform state (these points will be described in detail in Examples and the like described later).

The production of the fatty acid potassium salt solution in the present invention will be described in detail. First, the lower fatty acid ester of fatty acid and propylene glycol (PG) are charged into a reaction vessel at normal temperature (room temperature) and normal pressure (760 torr) and stirred. Thereafter, the atmosphere is replaced with nitrogen at 50 torr, and then the temperature is raised. Then
Potassium hydroxide is added dropwise to this reaction vessel to perform saponification treatment.
The reaction temperature is 85-95 ° C, preferably 89-91 ° C, and the reaction pressure is under normal pressure. The concentration of PG is 15 to 50% by weight, preferably 25 to 35% by weight, from the viewpoint of improving the fluidity (viscosity of 100 cP or less) in the final solution during the reaction.
It is desirable that In the reaction, the final solution is sufficient to be brought into the reaction with KOH as the raw material, and the final solution is desirably 15 to 25% by weight, preferably 15 to 20% by weight from the viewpoint of the washing ability.

After the saponification treatment, the mixture is aged at 89 to 91 ° C. for 1 to 2 hours, and then from normal pressure to 400 torr for 3 to 4 hours, and further from 400 torr to 300 torr for 1.0 to 1.0 torr.
Separate methanol and water by topping for 1.5 hours. After the above-mentioned topping treatment, the solution is cooled at 50 ± 5 ° C., and water is further added to adjust the water content, whereby a target fatty acid potassium salt solution can be produced. It is desirable that the resulting fatty acid potassium salt solution is 50 to 75% by weight, preferably 50 to 55% by weight, from the viewpoint of fluidity at the time of reaction and the final solution at the time of reaction. . In addition, the viscosity of the fatty acid alkali metal salt solution is 40 to 100 cp / 50 ° C. in view of handling.
Is preferably adjusted to the range described above.

[0013] In the present invention thus constituted, the fatty acid lower alcohol ester and potassium hydroxide can be reacted in a uniform state in the presence of propylene glycol (PG), so that the production efficiency and economy can be satisfied. ,
Thus, a fatty acid potassium salt solution and a method for producing the same, which can efficiently separate methanol after saponification, can be obtained. The resulting fatty acid potassium salt solution can be suitably used as a liquid soap (body soap) raw material and a solid soap raw material. In the case of a solid soap, the obtained fatty acid alkali metal salt solution is further subjected to neutralization, salting-out, etc., if necessary, to obtain a soap base (nitosoap).
After blending and adjusting various additives to the soap chips or the soap chips dried with the tosop, and kneading with a machine kneading method by a kneading with a prodder or the like, homogenously compounding, and stamping to finish product ( Solid soap composition),
In the frame kneading method, a finished product (solid soap composition) can be obtained by putting in a mold, cooling, drying for a predetermined number of days, and then stamping. The above-mentioned various other additives include water, fragrance, dye, humectant, superfatting agent, foaming agent, antioxidant, pH adjuster, anionic surfactant, amphoteric surfactant used in general soaps. Surfactants, nonionic surfactants, higher fatty acid alkanolamides, polyhydric alcohols, and other oily substances (such as lanolin, liquid paraffin, and solid paraffin).

[0014]

Next, the present invention will be described in more detail with reference to examples, but the present invention is not limited to the following examples.

Example 1 FIG. 1 shows the flow of this synthesis method.
FIG. 32 shows the flow of the manufacturing process. As shown in FIGS. 1 and 3, 180 g of lauric acid methyl ester (Pastel M-12, manufactured by Lion Corporation) and 105 g of PG as fatty acid lower alcohol esters were charged into a reaction vessel at normal temperature (room temperature) and normal pressure (760 torr). After the stirring, the atmosphere was replaced with nitrogen (50 torr × 2 times). Then, under normal pressure (760 torr
r), the temperature was raised to 90 ° C., and 102 g of 48% KOH was added dropwise (102 g / 30 minutes (0.5 hr)) to give a reaction temperature of 9%.
The saponification reaction was performed at 0 ° C. ± 5 ° C. The molar ratio of KOH / methyl laurate was 1.05. After the saponification reaction, the mixture is aged at a temperature of 90 ° C. ± 5 ° C. for 1 hour, then at normal pressure to 400 torr for 3 hours, and further at 400 torr to 3
The mixture was topped at 00 torr for 1.5 hours to separate methanol and water (total amount: 43.6 g, methanol content: 27 g). After the above topping treatment, cool at 50 ° C,
Further, the desired fatty acid potassium salt solution (C12 potassium soap solution, 60 cp / 50 ° C., 358 g) was produced by adding 48.6 g of water and adjusting the water. Solid content (%) and viscosity (cp / cp) of the obtained fatty acid potassium salt solution
50 ° C.), unreacted ester content (%), moisture (%), freezing point (° C.) and target properties are shown in Table 1 below.

Example 2 FIG. 2 shows the flow of this synthesis method.
FIG. 3 shows the flow of the manufacturing process. As shown in FIGS. 2 and 3, 182 g of myristic acid methyl ester (Pastel M-14, manufactured by Lion Corporation) and 106 g of PG as fatty acid lower alcohol esters were charged into a reaction vessel at normal temperature (room temperature) and normal pressure (760 torr). After stirring, the atmosphere was replaced with nitrogen (50 torr x 2 times). Then, under normal pressure (760 torr
r), the temperature was raised to 90 ° C., and 92 g of 48% KOH was added dropwise (92 g / 30 minutes (0.5 hr)), and the reaction temperature was 90 ° C.
A saponification reaction was performed at ± 5 ° C. The molar ratio of KOH / myristic acid methyl ester was 1.05. After the saponification reaction, the mixture is aged at a temperature of 90 ° C. ± 5 ° C. for 1 hour, then at normal pressure to 400 torr for 3 hours, and further at 400 torr to 3
The mixture was topped at 00 torr for 1.5 hours to separate methanol and water (total amount: 40.1 g, methanol content: 24 g). After the above topping treatment, cool at 50 ° C,
Further, the target fatty acid potassium salt solution (C14 potassium soap solution, 8
0 cp / 50 ° C., 348 g). Solid content (%), viscosity (cp / 50) of the obtained fatty acid potassium salt solution
° C), unreacted ester content (%), moisture (%), freezing point (° C) and target properties are shown in Table 1 below.

[0017]

[Table 1]

From the results shown in Table 1, in Example 1, saponification reaction of lauric acid methyl ester and potassium hydroxide was carried out in the presence of PG. In Example 2, myristic acid methyl ester and potassium hydroxide were present in the presence of PG. By performing the saponification reaction under the respective conditions, the reaction can be performed in a uniform state, and the desired fatty acid potassium salt solution can be obtained in which the methanol can be efficiently separated and the unreacted ester component does not remain. I understood.

[0019]

According to the present invention, a saponification reaction of fats and oils and an alkali metal in the presence of propylene glycol (PG) can be carried out in a uniform state, and methanol can be efficiently separated. And a method for producing a fatty acid alkali metal salt solution which is excellent in production efficiency and economical efficiency and can provide a fatty acid alkali metal salt solution in which no unreacted ester component remains.

[Brief description of the drawings]

FIG. 1 is a drawing showing a flow of a synthesis method of Example 1.

FIG. 2 is a drawing showing a flow of a synthesis method of Example 2.

FIG. 3 is a drawing showing a flow of a manufacturing process of Examples 1 and 2.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C11D 13/00 C11D 13/00 17/08 17/08 F term (Reference) 4H003 AB03 AB44 BA01 BA12 CA16 DA02 4H006 AA02 AA05 AB70 AC47 BB14 BE10 BS10 BS70 4H059 AA03 BA13 BA26 BA30 BB02 BB03 CA39 DA22 EA40

Claims (2)

[Claims] 1. A method for producing a fatty acid potassium salt solution, comprising reacting a fatty acid lower alcohol ester with potassium hydroxide in the presence of propylene glycol to obtain a fluid fatty acid potassium salt solution. 2. A fluid fatty acid potassium salt solution obtained by the production method according to claim 1.