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Method of preparing long-chain fatty alcohol from rice bran wax

A long-chain fatty alcohol and rice bran wax technology, which is applied in chemical instruments and methods, hydrolysis preparation, oxygen-containing compound preparation, etc., can solve the problems of high saponification reaction temperature, side reaction products, difficulty of crushing, etc., and achieve long reaction time , increase the reaction temperature, and the effect of easy crushing

Inactive Publication Date: 2003-01-08
许仁溥 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that KOH or NaOH is used in dry saponification, and the price is high; the saponification reaction temperature is high, the energy consumption is large, and side reaction products are easily produced, resulting in heterogeneous bodies; the saponification reaction product is sodium fatty acid or potassium fatty acid and long-chain fat The hardness of the alcohol mixture is not too hard, not brittle, and difficult to crush

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0016] The processing step of example 1 is:

[0017] 1, get domestic coarse bran wax 200kg, its acetone soluble matter is 21%, fusing point 76 ℃, saponification value 89; 2, saponification reaction: add above-mentioned raw material into the stainless steel reactor that stirrer is arranged, be heated to rice bran wax melting, in Slowly add 60kg of 50% calcium hydroxide water slurry into the reaction kettle under stirring, heat and saponify for 5 hours, the final temperature is 150°C, and 213kg of brown solids are obtained after the reaction, with a yield of 92.6%; After being pulverized by a pulverizer, it is a mixture powder of fatty acid calcium and long-chain fatty alcohol; 4. Take 60 kg of the above mixture powder, add it to an extraction tank equipped with a cooling reflux device, and add 900 kg of solvent ethanol, heat for 2 hours, and filter while it is hot. Remove ethanol insolubles, namely fatty acid calcium, and leave mother liquor that is dissolved in ethanol solutio...

example 2

[0020] Get domestic refined bran wax (9.3% of acetone soluble matter, melting point 78.1 ℃, saponification value 85.2) 200kg, add in the reactor of the same example 1 and heat to melt the wax, slowly add 35% calcium oxide in the wax liquid under stirring 80kg of water slurry, heated and reacted for 5 hours while stirring, and the final temperature was 180°C. After the reaction, 220kg of brown solid matter was obtained, with a yield of 96%. After pulverization, a mixture of calcium fatty acid and long-chain fatty alcohol was obtained; weigh 60kg of the above powder , add the extraction tank as example 1, add ethanol 1000kg, heat 3 hours, filter while hot, remove fatty acid calcium, mother liquor is heated and reclaims ethanol, obtains long-chain fatty alcohol 25.8kg, and the yield to wax is 47%.

example 3

[0022] Take by weighing 1kg of the coarse bran wax particles of the same example 1, put it into the reactor together with 250g of 70% calcium hydroxide water slurry, heat while stirring, saponify for 5 hours, and the final temperature is 150°C, and the reaction ends to obtain fatty acid calcium and long-chain Fatty alcohol mixture 1069g, yield 93%, pulverized into powder, weighed 1kg of powder, added to extraction tank, then added acetone 15kg, heated to acetone reflux for 2 hours, then stopped heating, kept warm and filtered to remove acetone insoluble matter fatty acid calcium, and Gained mother liquor is allowed to cool to room temperature, and along with the reduction of solution temperature, separate out the fatty alcohol that dissolves into acetone, filter again, with the acetone precipitate of gained, i.e. long-chain fatty alcohol, remove acetone under vacuum negative pressure, yield 280g, to The wax yield is 30%, and the fatty alcohol composition (C%) is the same as Exa...

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Abstract

The method for preparing long-chain aliphatic alcohol by utilizing rice bran wax includes the following steps: using fine rice bran wax or crude rice bran wax as raw material, adopting dry saponification process, using wet calcium oxide or calcium hydroxide, the ratio of it and water is 1:0.5-10, the dosage of calcium oxide or calcium hydroxide is 10-30% of weight of rice bran wax, its saponification reaction temp. is 95-180 deg.C and reaction time is 2-10 hr. after the reaction and cooled obtaining mixture of aliphatic acid calcium and long-chain aliphatic alcohol, pulverizing said mixture to make into powder, making solvent extraction, fully mixing powder and solvent, filtering to remove insoluble aliphatic acid calcium, recovering solvent from mother liquor and obtaining the long-chain aliphatic alcohol.

Description

technical field [0001] The invention belongs to the preparation technology of fat, and relates to a preparation method of long-chain fatty alcohol. Background technique [0002] Rice bran wax contains C 22 -C 38 The homologous long-chain fatty alcohol is a long-carbon-chain ortho-primary monohydric alcohol, most of which are combined with long-chain fatty acids to form wax esters, and a small amount is free fatty alcohol, and the content of long-chain fatty alcohol in pure rice bran wax is more than half . The long-chain fatty alcohol contains octacosanol, triacyl alcohol and the like. Stecosanol is a well-known anti-fatigue substance, and triacyl alcohol is an effective plant growth regulator, which can promote the growth of crops. Rice bran wax is an ideal raw material for the preparation of long-chain fatty alcohols and the extraction of octacosanol and triacyl alcohol. But rice bran wax is unsaponifiable, long-chain fatty alcohol C 22 -C 38 with long chain fatty a...

Claims

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Application Information

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IPC IPC(8): C07C27/02C07C29/09C07C31/02
Inventor 许仁溥徐建林丁新中
Owner 许仁溥
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