Method for Determination of Iodine Value of Palm Oil

A determination method and palm oil technology, applied in the direction of thermal development of materials, can solve the problems of complex operation of palm oil iodine value determination, poisoning of reagents, etc., and achieve the effects of accurate and reliable determination results, safe and simple operation, and fast determination speed.

Active Publication Date: 2017-07-21
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the deficiencies in the prior art, the present invention provides a novel method for measuring the iodine value of palm oil, which solves the problems of complex operation and relatively poisonous reagents in the determination of the iodine value of palm oil at present. The method of the present invention is fast, safe and reliable

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  • Method for Determination of Iodine Value of Palm Oil
  • Method for Determination of Iodine Value of Palm Oil
  • Method for Determination of Iodine Value of Palm Oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Example 1: Establishment of a standard control curve between the iodine value of a palm oil sample and the crystallization exothermic peak.

[0043] Take 30 different grades of palm oil products with known iodine value of 65-75, heat these samples at 70°C under stirring, dissolve them all, and keep the temperature for 30 minutes; take 5 mg of palm oil samples to differential In the scanning calorimeter crucible, seal it with a matching crucible lid, and put it into the differential scanning calorimeter. The crucible was heated up to 70°C at 5°C / min, kept at a constant temperature for 30 minutes, and then cooled to -45°C at 5°C / min to measure the heat change during palm oil crystallization. The obtained exotherm spectra of different samples are as follows: figure 1 shown.

[0044] The iodine value of the above-mentioned oil sample is respectively different from the oil crystallization peak 1 measured by differential scanning calorimetry (the crystallization point tempe...

Embodiment 2

[0045] Example 2: Using differential scanning calorimetry T on - Iodine value standard control curve to determine the iodine value of palm oil.

[0046] The iodine value of the palm oil sample to be analyzed was determined by differential scanning calorimetry. First, 10 mg of the palm oil sample was added to the crucible of the differential scanning calorimeter, sealed with a matching crucible cover, and put into the differential scanning calorimeter. The crucible was heated up to 70°C at 5°C / min, kept at a constant temperature for 30 minutes, and then cooled to -45°C at 5°C / min to measure the heat change during palm oil crystallization. By this method, measure the crystallization point temperature T of the crystallization peak 1 of this sample on is -12.03°C, compare this value with the fitted T on - iodine value standard curve (results such as figure 2 Shown) is compared and utilizes the correlation formula Y=-0.6203X+68.2912 in the figure to calculate and obtain the iod...

Embodiment 3

[0047] Example 3: Using differential scanning calorimetry T on - Iodine value standard control curve to determine the iodine value of palm oil.

[0048] The iodine value of the palm oil sample to be analyzed was determined by differential scanning calorimetry. First, 5 mg of the palm oil sample was added to the crucible of the differential scanning calorimeter, sealed with a matching crucible cover, and put into the differential scanning calorimeter. The crucible was heated to 60°C at 5°C / min, kept at a constant temperature for 40min, and then cooled to -50°C at 5°C / min to measure the heat change during palm oil crystallization. By this method, measure the crystallization point temperature T of the crystallization peak 1 of this sample on is -10.03℃, and this value is compared with the fitted T on - iodine value standard curve (results such as figure 2 Shown) is compared and utilizes the association formula Y=-0.6203X+68.2912 in the figure to calculate and obtain the iodin...

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Abstract

The invention relates to a method for measuring the iodine value of palm oil. The higher the iodine value of palm oil, the lower the degree of saturation and the higher the degree of unsaturation, so the corresponding melting point of palm oil is lower, and the crystallization temperature corresponding to the cooling crystallization process is lower. The temperature of the crystallization peak in the exothermic curve of the palm oil crystallization process obtained by differential scanning calorimetry is correlated with the iodine value of the sample, and then the crystallization point temperature T on , peak temperature T peak , crystallization completion temperature T off The relationship with the iodine value; used to analyze a series of subsequent palm oil samples, without the need to re-establish the standard control curve and its corresponding correlation formula for each analysis. The iodine value of palm oil samples in different iodine value ranges can be determined by utilizing a novel method for measuring the iodine value of palm oil provided by the invention. The invention has the advantages of safe and simple operation, fast experimental measurement speed, accurate and reliable measurement results, and improves the safety and efficiency of oil sample measurement.

Description

technical field [0001] The invention belongs to the technical field of crystallization in the chemical engineering industry, and in particular relates to a method for measuring the iodine value of palm oil. Background technique [0002] Palm oil is extracted from the palm pulp of the oil palm tree, mainly triglycerides (mass fraction is about 98%), and a small amount of diglycerides and monoglycerides. Triglycerides are formed from glycerol and long-chain fatty acids, and the long-chain fatty acids mainly include palmitic acid with a mass fraction of about 45%, and oleic acid and linoleic acid with a mass fraction of about 40%. Different long-chain fatty acids can form different triglycerides. The saturation degree of palm oil is about 50%. Because it does not contain cholesterol, is rich in vitamin E and carotene, and is cheap, it is widely used in cooking and food manufacturing at home and abroad. At present, palm oil is an important part of the world's oil market, and i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N25/20
Inventor 郝红勋黄欣王静康侯宝红尹秋响王永莉张美景龚俊波鲍颖谢闯王召
Owner TIANJIN UNIV
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