JPH061995A - Production of sesame oil - Google Patents

Abstract

PURPOSE:To obtain sesame oil improved in color, acid value, taste, etc., in high yield while reducing the load of waste water treatment by keeping sesame raw oil in a specific temperature range before alkali purification, aging the sesame raw oil after allowing to stand for a specific time and then subjecting the sesame raw oil to solid-liquid separation without adding water. CONSTITUTION:Sesame raw oil mixed with pressed oil and extracted oil is kept at 30-70 deg.C and allowed to stand for >=1min in a stationary tank to age the raw sesame oil and then continuously subjected to solid-liquid separation by using a centrifuge without adding water. Phosphoric acid is added to the separated oil in an amount of 0.05wt.% based on the oil and an aqueous solution of caustic soda at a 16 Baume degree concentration is added in an amount of 110% acid value equivalent of raw oil and free fatty acid, residual phospholipid, color substance, etc., are centrifuged at 4000-7000rpm to purify the sesame oil with an alkyl and carry out deodorization. Thereby, the load of waste water treatment is reduced and quality of color, acid value, taste, etc., of the product oil are improved and purification yield is increased to provide the objective sesame oil.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a method for producing sesame oil.

[0002]

2. Description of the Related Art In the production of sesame oil, sesame seeds are usually roasted, pressed and, in some cases, solvent extracted to obtain sesame crude oil. Crude oil obtained by pressing is called pressed oil, and crude oil obtained by extracting is called extracted oil. Conventionally, only compressed oil was used, but recently, mixed oils of compressed oil and extracted oil have been often used. Sesame refined oil can be obtained by subjecting this mixed crude oil to respective purification steps of deoxidation, washing with water, decolorization and deodorization. Deoxidation and washing with water are called alkaline refining.
Further, the decolorizing step may be omitted depending on the application. These refining steps are almost the same as those for soybean oil and rapeseed oil, but sesame oil is often carried out lightly because the fragrance is particularly important.

[0003]

[Problems to be Solved by the Invention] Sesame crude oil contains a considerable amount of mucilage called slag or slag, which must be removed. Conventionally, prior to alkali refining,
The so-called degumming method was tried in which the crude oil was allowed to stand for a long time as it was, or water was added to hydrate and agglomerate the mucilage.
Both could not be separated well, the yield of sesame oil was poor, and the subsequent refining treatment was often troublesome, resulting in poor refining efficiency. Therefore, at present, a method of directly refining crude oil with an alkali is adopted.

This mucilage contains a wax-like substance having a high melting point, phospholipids, saccharides, glycolipids, proteins and the like (hereinafter referred to as wax-like substance), and in the degumming method in which water is added, it becomes oil. A mucilage portion and an intermediate layer are formed, and the mucilage portion containing the wax-like substance is entangled with the oil layer, which makes it difficult to separate and remove the mucus. Further, since the entangled portions are mixed in the wastewater discharged from this process, a considerable load is imposed on the treatment, which is a major problem for manufacturers.

In view of such circumstances, the inventors of the present invention were able to obtain a product oil having a good quality and flavor with a good yield even in a sesame oil production method, even from a poor quality sesame crude oil containing a large amount of oil slag or The present invention has been completed through intensive studies for the purpose of developing a technique capable of reducing the load of wastewater treatment.

[0006]

[Means for Solving the Problems] That is, according to the present invention, in the method for producing sesame oil, the sesame crude oil is kept at 30 to 70 ° C. prior to the alkali refining step, and after aging for one minute or more, it is solidified without adding water. It is a method for producing sesame oil, which is characterized by liquid separation.

The alkali refining referred to in the present invention is a step of adding an aqueous solution of caustic soda as an alkali to crude oil and separating free fatty acids, residual phospholipids, colored substances and the like by centrifugation or the like. Centrifugation is 4000-7000rp
m continuously.

In the present invention, prior to such alkali refining, sesame crude oil is treated at 30 to 70 ° C, preferably 40 to 60 ° C.
It is characterized in that the solid-liquid separation is carried out without adding water after keeping it for 1 minute or more and aging it by standing still. When the temperature is lower than 30 ° C, the viscosity of crude oil increases, and the solid-liquid separation ability of the centrifuge decreases. On the other hand, when the temperature exceeds 70 ° C, a part of the wax-like substance contained in the mucilage is dissolved in the crude oil and solid-liquid separation becomes impossible even if the aging time is lengthened. The aging time is 1 minute or more, and if it is less than that, crystal growth of the wax-like substance or the like is hindered, and the wax-like substance or the like becomes entangled with each other to make separation difficult. The crude oil from which the wax-like substance and the like have been separated is sent to the next alkali refining step, and then subjected to steps such as deodorization to produce refined sesame oil.

[0009]

【Example】

Example 1 Sesame crude oil in which the compressed oil and the extracted oil were mixed was maintained at about 60 ° C. and aged for 5 minutes in a stationary tank, and then a centrifugal separator (rotation speed 6000 rpm) was used without adding water. Solid-liquid separation was performed continuously. Separated oil is phosphoric acid vs. oil 0.05
wt% was added, and a caustic soda aqueous solution having a concentration of 16 ° Baume was added by 110% of the acid value equivalent of crude oil for alkali refining and deodorization to obtain sesame refined oil. The chromaticity (lobby bond, 1 inch cell; the same applies hereinafter) and acid value of the obtained refined oil are 4 respectively.
At 0Y / 5.0R and 0.09, the flavor was mellow and good.

Example 2 The same sesame crude oil as in Example 1 was maintained at about 60 ° C. and aged for 1 minute in a stationary tank, and then centrifuged and solidified in the same manner as in Example 1 without adding water. The liquid was separated. Then, it refine | purified with an alkali like Example 1 and deodorized, and the refined sesame oil was obtained. The chromaticity and acid value were almost the same as in Example 1, and the flavor was not a problem.

Comparative Example 1 The same sesame crude oil as in Example 1 was directly alkali-refined without going through the solid-liquid separation step. The conditions for alkali refining were the same as in Example 1, and then the same procedure as in Example 1 was carried out to obtain a sesame refined oil. The chromaticity and acid value were 40Y / 8.4R and 0.22, respectively, and the flavor had a slightly bitter taste.

Comparative Example 2 The same sesame crude oil as in Example 1 was heated to about 60 ° C., solid-liquid separated in the same manner as in Example 1 by a centrifuge without adding water without aging. The subsequent steps were the same as in Example 1.
As a result, the obtained sesame refined oil had a chromaticity and an acid value of 40, respectively.
With Y / 6.7R, 0.15, the overall color tone was slightly less transparent, and the flavor was a little heavy.

Comparative Example 3 The same sesame crude oil as in Example 1 was kept at about 90 ° C., and a refined sesame oil was obtained in the same manner as in Example 1. When it was kept at room temperature, it was slightly cloudy and was not suitable as a refined sesame oil.

Comparative Example 4 The same sesame crude oil as in Example 1 was kept at about 15 ° C. and aged for 5 minutes and then subjected to solid-liquid separation treatment by a centrifuge, but the separation state was poor and solid-liquid separation was impossible. .

Evaluation The quality of the product oil by the solid-liquid separation method of the present invention and the conventional method, the basic unit in wastewater treatment, and the refining yield were comparatively evaluated (Table 1).
reference). In the table, the difference in power consumption and refining yield is
This is a great advantage when mass-processing sesame oil in actual production.

[0016]

[Table 1]

[0017]

Industrial Applicability According to the method of the present invention, in the production of sesame oil, the quality of product oil such as chromaticity, acid value, flavor and the like is improved as compared with the conventional method, and further, the purification yield is increased and the wastewater treatment is performed. The load on is also reduced.

Claims (1)

[Claims] 1. A sesame oil characterized in that, in the method of producing sesame oil, sesame crude oil is kept at 30 to 70 ° C. prior to the alkali refining step, and after aging for one minute or more, solid-liquid separation is performed without adding water. Manufacturing method.