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Technology for preparing lauric acid by adopting litsea cubeba kernel oil

A technology of lauric acid and nucleolus oil, which is applied in the direction of fatty acid preparation/refining, fatty acid production, etc., can solve the problems of difficulty in obtaining pure lauric acid, high investment cost of rectification equipment, exerting great pressure, etc., and achieves solvent recycling. , The effect of simplifying operation and reducing investment cost

Inactive Publication Date: 2014-10-01
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the purity of lauric acid in mixed fatty acids is very high, lauric acid can be separated by pressing, so it must be rectified to obtain sufficiently pure lauric acid, so that the rectification process takes a long time, consumes a lot of energy, and costs high. At the same time, rectification High equipment investment costs and low production efficiency
When the purity of lauric acid in the mixed fatty acid is not high, it needs to be distilled again; when there are impurities close to the melting and boiling point of lauric acid, it is difficult to obtain lauric acid with higher purity by combining rectification and pressing
In addition, the squeezer also needs to apply a lot of pressure, which consumes a lot of energy.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Example 1: Take 15 kg of crushed and sieved Litsea cubeba processing residue, add 210 L of petroleum ether (60-90 °C boiling range), reflux at 80 °C for 2 h, cool, filter, and the filtrate is rotary evaporated to obtain nucleolus oil, dried at 60°C to constant weight, and weighed to obtain 3.9 kg of kernel oil.

[0011] Take 500 mL Litsea cubeba kernel oil, preheat to 70 °C under stirring, add 10 mL of 95%-98% concentrated sulfuric acid, stir for 5 min, add 25 mL of water, continue stirring for 30 min, stop stirring and keep warm for 30 min Cool to room temperature, pour out the upper layer of oil, wash with water until neutral to obtain 480 mL of oil, and the lower layer is a pitch-like substance.

[0012] Take 400 mL of acid-refined kernel oil, preheat to 75 °C under stirring, add 200 mL of 1 mol / L NaOH solution, stir evenly, and measure the pH to 11; then add 50 mL of 35% dilute Sulfuric acid, stir evenly, boil for 5 minutes, stop stirring, keep warm for 20 minutes,...

Embodiment 2

[0015] Example 2: Take 30 kg of crushed and sieved Litsea cubeba processing residue, add 420 L of petroleum ether (60-90 °C boiling range), reflux at 80 °C for 2 h, cool, filter, and the filtrate is rotary evaporated to obtain nucleolus oil, dried at 60°C to constant weight, and 8.1 kg of kernel oil was weighed.

[0016] Take 1000 mL Litsea cubeba kernel oil, preheat to 70°C under stirring, add 20 mL of 95%-98% concentrated sulfuric acid, stir for 5 minutes, add 50 mL of water, continue stirring for 30 minutes, stop stirring and keep warm for 30 minutes Cool to room temperature, pour out the upper layer of oil, wash with water until neutral to obtain 990 mL of oil, and the lower layer is a pitch-like substance.

[0017] Take 800 mL of acid-refined kernel oil, preheat to 75°C under stirring, add 400 mL of 1mol / L NaOH solution, stir evenly, and measure the pH to 11; then add 100 mL of dilute sulfuric acid with a volume ratio of 35%, After stirring evenly, boil for 5 minutes, st...

Embodiment 3

[0020] Example 3: Take 45 kg of crushed and sieved Litsea cubeba processing residue, add 620 L of petroleum ether (60-90 °C boiling range), reflux at 80 °C for 2 h, cool, filter, and the filtrate is rotary evaporated to obtain nucleolus oil, dried at 60°C to constant weight, and weighed to obtain 12.2kg of kernel oil.

[0021] Take 1500 mL Litsea cubeba kernel oil, preheat to 70 °C under stirring, add 30 mL of 95%-98% concentrated sulfuric acid, stir for 5 min, add 75 mL of water, continue stirring for 30 min, stop stirring and keep warm for 30 min Cool to room temperature, pour out the upper layer of oil, wash with water until neutral to obtain 1480 mL of oil, and the lower layer is a pitch-like substance.

[0022] Take 1200 mL of acid-refined kernel oil, preheat to 75°C under stirring, add 600 mL of 1 mol / L NaOH solution, stir evenly, and measure the pH to 11; then add 150 mL of 35% dilute Sulfuric acid, stir evenly, boil for 5 minutes, stop stirring, keep warm for 20 minut...

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Abstract

The invention relates to a technology for extracting and purifying lauric acid from litsea cubeba kernel oil. The technology comprises the following steps in sequence: acid refining, hydrolyzing, rectifying, freezing a solvent crystallization, suction filtering and drying, wherein simple rectifying is used to enable the purity of the lauric acid to reach 70%; when the solvent crystallization is frozen, the solvent is a mixed solvent with the volume ratio that normal hexane or cyclohexane: ethyl alcohol is (4-4.5): 1, and the temperature of -15 DEG C to -20 DEG C is preferentially chosen under the ordinary pressure. According to the invention, the conventional rectifying is replaced by the simple rectifying, so that the rectifying operation is simplified, the speed is high, the energy consumption is low, the investment cost is reduced, and the production effect is improved; the solvent crystallization is frozen simply and the solvent can be recycled, which is economical and environment-friendly, and the purity of the lauric acid can reach more than 98%.

Description

technical field [0001] The invention relates to a process for extracting and purifying lauric acid from litsea cubeba kernel oil. Background technique [0002] Litsea cubeba is one of the unique spice resources in southern my country. Litsea cubeba oil is rich in citral, which is a raw material for the synthesis of ionone, ironone, etc. Litsea cubeba oil is often extracted by steam distillation in industry; Nucleolus oil can also be extracted from the Litsea cubeba residue of litsea cubeba oil, which is rich in natural oils and can be used to extract fatty acids, among which lauric acid is the most important one. Lauric acid is a saturated straight-chain dodecanoic acid, which can be used in the production of alkyd resins, wetting agents, detergents, insecticides, surfactants, food additives, etc. It is an important raw material for chemical, coating and other industries. [0003] In order to extract lauric acid from Litsea cubeba kernel oil, Cheng Sixi[Research on Extractin...

Claims

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Application Information

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IPC IPC(8): C11C1/08C11C1/04C11C1/10
Inventor 李湘洲周军杨国恩张胜
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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