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Method for preparing low-temperature-resistant palm oil with high iodine value

A palm oil and anti-low temperature technology, applied in the direction of fat oil/fat separation, fat production, etc., can solve the problems of destroying palm oil high temperature resistance, anti-oxidation, increasing palm oil production cost, reducing oil fractionation time, etc., to achieve improved separation Efficiency and separation effect, shortening process operation time, and good product quality

Active Publication Date: 2014-03-05
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the addition of crystal inhibitors, the advantages of high temperature resistance and anti-oxidation of palm oil are also destroyed, which increases the production cost of palm oil.
Chinese patent CN102719311A studies the dry fractionation of palm oil. Compared with the original process, by adding seed crystals, the oil fractionation time is reduced by 17h (accounting for 25% of the original process), and the fractionation cost is reduced by about 44%, but Because only one-way cooling is used, there are many fine crystals produced, and filtration and separation are difficult. Only products with an iodine value of about 70 can be prepared, and the purpose of low temperature resistance has not been achieved, and the product quality needs to be further improved.

Method used

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  • Method for preparing low-temperature-resistant palm oil with high iodine value
  • Method for preparing low-temperature-resistant palm oil with high iodine value
  • Method for preparing low-temperature-resistant palm oil with high iodine value

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1: (one tooth at a time)

[0033] At a temperature of 80°C, heat palm oil with an iodine value of 64 under stirring to dissolve it completely, then cool down to -3°C at a cooling rate of 1°C / min, and grow crystals at a constant temperature for 60 minutes; then at a rate of 0.2°C / min Raise the temperature to 0°C and keep the temperature constant for 60 minutes; cool down to -4°C at a rate of 0.2°C / min and keep the temperature constant for 60 minutes. The obtained oil was transferred to a separator and centrifuged at -5°C for 20 minutes. The oil was divided into solid and liquid phases, and the solid oil was removed by liquid separation to obtain palm olein with an iodine value of 67.05. The yield is 80.6%, and the product DSC picture is as image 3 shown. From the DSC figure, it can be seen that with figure 1 Compared with the DSC chart of raw oil, the crystallization peak temperature decreased from -2.96°C to -3.31°C, and the melting point decreased by 0.35°C...

Embodiment 2

[0034] Example 2: (two teeth once)

[0035]At a temperature of 60°C, heat palm oil with an iodine value of 64 under stirring to dissolve it completely, then cool down to -10°C at a cooling rate of 0.8°C / min, and grow crystals for 20 minutes; then increase the temperature at a rate of 0.5°C / min Raise the temperature to -4°C, keep it for 20 minutes, then cool it down to -12°C at a cooling rate of 0.5°C / min, and keep it for 20 minutes; The cooling rate is to cool down to -14°C and keep warm for 20min. The obtained oil was transferred to a separator and centrifuged at -15°C for 10 minutes. The oil was divided into solid and liquid phases, and the solid oil was removed by liquid separation to obtain palm olein with an iodine value of 67.7. The yield was 83.2%. Product DSC pictures such as Figure 4 As shown, the crystallization peak temperature was -3.91°C.

Embodiment 3

[0036] Example 3: (primary two-tooth + secondary two-tooth)

[0037] At a temperature of 80°C, heat palm oil with an iodine value of 63 under stirring to dissolve it completely, then cool down to 0°C at a cooling rate of 0.7°C / min, and grow crystals for 30 minutes; then raise the temperature at a heating rate of 0.5°C / min To 4°C, keep warm for 30min; cool down to -2°C at a cooling rate of 0.5°C / min, keep warm for 30min. Then, the temperature was raised to 2°C at a heating rate of 0.3°C / min, and kept for 30 minutes; the temperature was lowered to -4°C at a cooling rate of 0.3°C / min, and kept for 30 minutes. The obtained oil was transferred to a separator and centrifuged at -5°C for 15 minutes. The oil was divided into solid and liquid phases, and the solid oil was removed by liquid separation to obtain palm olein with an iodine value of 67.1. The yield was 82.4%.

[0038] Take the palm oil obtained by one fractionation, heat it at 80°C, dissolve it completely, then cool it do...

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Abstract

The invention relates to a method for preparing low-temperature-resistant palm oil with high iodine value. The method comprises the following steps: (1) heating palm oil with iodine value higher than 60 at a temperature of 60-80 DEG C while stirring to completely dissolve the palm oil, then, cooling to minus 10 to 0 DEG C, and maintaining the temperature; heating up to 3-6 DEG C and maintaining the temperature; cooling to 4-8 DEG C and maintaining the temperature; and (2) transferring the palm oil obtained in the step (1) into separation equipment, centrifugally separating the palm oil at minus 15 to minus 5 DEG C until the grease is divided into a solid phase and a liquid phase, and extracting the liquid phase to obtain a palm oil product. The method for preparing low-temperature-resistant palm oil with high iodine value provided by the invention can be used for obtaining low-temperature-resistant palm oil product with iodine value higher than 75. Since such novel substances as a crystallization inhibitor, a crystallization solvent and the like are not introduced into the method provided by the invention, the separation efficiency and the separation effect are improved and the operation time of the process is greatly shortened; and no wastewater is generated in the process, the safety is good, the energy consumption in the process is low and the quality of the final product is good, so that the application prospect is wide.

Description

technical field [0001] The invention belongs to the technical field of chemical engineering industry crystallization, and in particular relates to a preparation method of low-temperature-resistant palm oil with high iodine value. 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 composed of glycerol and long-chain fatty acids Formation, its long-chain fatty acids mainly include: palmitic acid mass fraction is about 45%, oleic acid and linoleic acid mass fraction are 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 m...

Claims

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Application Information

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IPC IPC(8): C11B7/00
Inventor 郝红勋王静康黄欣谢闯侯宝红鲍颖龚俊波王召陈巍张美景
Owner TIANJIN UNIV
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