Processing method of high acid value greasy

A high-acid value oil and processing method technology, applied in the direction of fat oil/fat refining, fat production, etc., can solve the problems of high energy consumption, long deodorization time, high requirements for equipment materials, etc., to reduce distillation temperature, improve oil quality, The effect of high application value

Inactive Publication Date: 2007-07-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

In physical refining, it is necessary to rely on high temperature to remove free fatty acids in oil, which mainly has the following disadvantages: 1) Long deodorization time, resulting in dark oil color and increased trans acid, often unable to produce high-quality edible oil; 2) Energy consumption High; 3) Fatty acids are corrosive to equipment at high temperatures, and have high requirements for equipment materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 5000g rice bran oil (containing free fatty acid 10.5%, the average molecular weight of fatty acid is 280), add ethanol 125g, make the mol ratio of fatty acid and ethanol be 1: 1.5, add the vitriol oil of 5g again. Heat to 75°C in a 10L reactor, reflux for 1 hour under stirring, stop the reaction, take a sample to measure the acid value after cooling, and the free fatty acid content of the oil sample is 3.3%. The reaction product was neutralized by adding NaOH solution with a concentration of 15%, and then slowly stirred at 75°C for 15 minutes to neutralize the reaction. After the reaction, the free fatty acid in the oil was measured to be 1.6%, and the soapstock was removed by centrifugal separation, and then centrifugally washed with 10% soft water to obtain Desoap oil.

[0032] Preheat the desoaped oil to 90°C, add clay with an oil weight of 3%, stir and decolorize under vacuum for 20 minutes, and then filter, then distill the decolorized oil with steam at 240°C and a...

Embodiment 2

[0034] 5000g rice bran oil (containing free fatty acid 16.8%, the average molecular weight of fatty acid is 280), add methyl alcohol so that the mol ratio of fatty acid and methyl alcohol is 1: 20, then add the vitriol oil of 8g. Heat to 60°C in a 10L reactor, reflux for 1 hour under stirring, stop the reaction, take a sample to measure the acid value after cooling, and the free fatty acid content of the oil sample is 1.5%. Add 300g of water to the reaction product, heat up and evaporate to recover methanol, then add NaOH solution with a concentration of 15% for neutralization, and slowly stir for 15 minutes at 75°C for neutralization. After the reaction, the free fatty acid in the oil is measured to be 0.2%. Then use 10% soft water to centrifuge and wash to obtain desoaped oil. The desoaped oil was operated according to the method of Example 1 to obtain refined oil 2, and the key indicators of the oil are shown in Table 1.

Embodiment 3

[0036]5000g corn oil (containing free fatty acid 8.3%, the average molecular weight of fatty acid is calculated as 280), add methyl alcohol so that the mol ratio of fatty acid and methyl alcohol is 1: 10, then add 30g sulfamic acid. Heat to 60°C in a 10L reactor, reflux for 3 hours under stirring, stop the reaction, take a sample to measure the acid value after cooling, and the free fatty acid content of the oil sample is 2.6%. The reaction product is heated up and evaporated to recover methanol, filtered to remove solid sulfamic acid, and then add NaOH solution with a concentration of 15% for neutralization, and slowly stir for 15 minutes at 75°C for neutralization. After the reaction, the free fatty acid in the oil is measured to be 0.5%. Remove the soap stock, then use 10% soft water to centrifuge and wash to obtain the desoaped oil. The desoaped oil is vacuum-dried at 90°C, then added with 2% white clay for decolorization reaction for 20 minutes, and filtered to enter the ...

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Abstract

The present invention relates to high acid number oil processing method. Enzyme or acid chemical catalyst is added into the mixture of high acid number oil and lower alcohol, and through selective esterification reaction, the oil has the free fatty acid content lowered to below 1-5 wt%. Most of the residual free fatty acid is converted into soap for separating out to obtain soap-eliminating oil; and the soap-eliminating oil is further processed through drying, decolorizing and deodorizing to form refined oil. The present invention raises the product oil quality and value, and has high application value to refining bran oil, corn oil, cotton seed oil and other high acid number oil.

Description

technical field [0001] The invention relates to a processing method, in particular to a processing method of high acid value oil. Background technique [0002] Chemical refining is a widely used oil refining method, which has the advantages of good versatility and high product quality. However, for the refining of oil with high acid value, the neutralization process of traditional chemical refining produces a large amount of soapstock, resulting in neutral oil A large number of losses and severe environmental pressure. In order to solve the disadvantage of high loss in chemical refining, people generally use physical refining to process high acid value oils, which improves the refining yield and greatly reduces the pressure on environmental protection. In physical refining, soapstock is generally not produced, and the quality of refined oil is greatly reduced due to the lack of adsorption of soapstock to phospholipids and other impurities. In physical refining, it is neces...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11B3/02C12S3/18
Inventor 杨博王永华杨继国王卫飞曹禺王小宁
Owner SOUTH CHINA UNIV OF TECH
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