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Refining method of castor oil with low acid value and low chroma

A technology of castor oil and low chroma, applied in the direction of fat oil/fat refining, fat production, etc., can solve the problems of unfavorable production scale-up of chromatography, no castor oil, etc.

Pending Publication Date: 2020-06-05
NANJING WELL CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The patent with the application number CN201510877807.8 adopts column chromatography to refine castor oil. Although reducing the acid value and chroma can achieve better results, the chromatography method is not conducive to production scale-up
[0005] At present, there is no report on the industrial refining process that can stably control castor oil acid value ≤0.5mgKOH / g, chroma ≤Y3

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Castor oil refining method,

[0022] 10kg of castor oil and 40kg of sherwood oil were dropped into the reactor, and the temperature was raised to 50° C., stirred and dissolved.

[0023] After dissolving, add 0.75 kg of activated clay and 0.25 kg of activated carbon, heat and stir at 50°C for 4 hours, and then filter to remove the adsorbent.

[0024] The filtrate was transferred to a separatory kettle, cooled to 25°C, allowed to stand for 6 hours to separate layers, and the lower layer was separated.

[0025] At 80-90°C, the lower layer was concentrated in vacuum to obtain 9.0 kg of refined castor oil, with a detected acid value of 0.22 mgKOH / g and a chromaticity of Y3.

Embodiment 2

[0027] 10kg of castor oil and 40kg of n-heptane were dropped into the reactor, heated to 60°C, stirred and dissolved.

[0028] After dissolving, add 1kg of alumina and 0.25kg of activated carbon, keep stirring at 60°C for 6 hours, and then filter to remove the adsorbent.

[0029] The filtrate was transferred to a separatory kettle, cooled to 25°C, allowed to stand for 8 hours to separate layers, and the lower layer was separated.

[0030] At 80-90°C, vacuum-concentrate the lower layer liquid to obtain 9.2 kg of refined castor oil, with a detected acid value of 0.20 mgKOH / g and a chromaticity of Y2.

Embodiment 3

[0032] 10kg of castor oil and 40kg of n-hexane were dropped into the reactor, and the temperature was raised to 55° C. and stirred to dissolve.

[0033] After dissolving, add 1 kg of diatomite and 0.3 kg of activated carbon, heat and stir at 55°C for 5 hours, and then filter to remove the adsorbent.

[0034] The filtrate was transferred to a glass separatory kettle, cooled to 25°C, allowed to stand for 6 hours, and the lower layer was separated.

[0035] At 80-90°C, the lower layer was concentrated in vacuum to obtain 8.9 kg of refined castor oil, the acid value was 0.24 mgKOK / g, and the chromaticity was Y2.

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Abstract

A refining method of low-acid-value low-chroma castor oil comprises the following steps: (1) mixing and dissolving commercially available industrial castor oil and an extracting agent according to a certain proportion; (2) adding an adsorbent into the solution obtained in the step (1), stirring and adsorbing; (3) filtering to remove the adsorbent; and (4) cooling the filtrate, standing for layering, performing separation to obtain a lower-layer supernatant, and removing the solvent to obtain a castor oil finished product with low chromaticity and low acid value, wherein the extracting agent comprises any one or a mixture of petroleum ether, normal hexane and normal heptane, and the dosage is 1-8 times of the mass of the castor oil; the adsorbent is any one or a mixture of activated carbonand decolorizing soil, activated clay, diatomite, aluminum oxide and magnesium oxide; the using amount of the activated carbon is 1-10% of the mass of the castor oil, and the mass of the other adsorbents is 1-50% of the mass of the castor oil. The method is simple in process flow and easy for large-scale production, can stably control the acid value of the finished product to be less than or equalto 0.5 mgKOH / g and the chroma to be less than or equal to Y3#, and the application range of the product in the field of medicines is broadened.

Description

technical field [0001] The invention relates to a method for refining castor oil with low acid value and low chroma. Background technique [0002] Castor oil is one of the top ten oil crops and four inedible oil crops in the world, mainly produced in Brazil and India. Castor oil is the only commercial oil mainly containing hydroxy acids. It is a very important chemical raw material. It can be directly used as a pharmaceutical raw material, and can also be used in synthetic resins, coatings, paints, soaps, plasticizers, and emulsifiers. , lubricants, etc. Now the world needs more than 700,000 tons of castor oil every year, and its role is irreplaceable. [0003] Castor oil is usually prepared by crushing castor beans and then cold pressing. Therefore, the crude oil of castor oil contains more impurities, such as free fatty acids, pigments, etc., so it cannot be directly used as medicine, and it needs to be treated with alkali. Refining, washing, decolorization and other st...

Claims

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Application Information

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IPC IPC(8): C11B3/00C11B3/10
CPCC11B3/001C11B3/006C11B3/10
Inventor 胡承朱兵王保成江浩曹昕卓厚天张美君
Owner NANJING WELL CHEM
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