Method for preparing mixed fatty acid from hogwash oil and use method of mixed fatty acid

A technology of mixing fatty acids and hogwash oil, which is applied in the fields of fatty acid production, fatty acid preparation/refining, carboxylate/lactone preparation, etc. It can solve the problems of immaturity, large investment, lipase not suitable for oil hydrolysis industrial production, etc., and achieve Strong fluidity, less investment in equipment, and low production cost

Inactive Publication Date: 2009-06-24
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

3.9×10 6 Pa does not add a catalyst, directly hydrolyzes, the product quality obtained by this method is good, and can be produced on a large scale, but the investment is relatively large
However, the current domestic technology is still immature, and the domestically produced lipase is not suitable for industrial production of oil hydrolysis

Method used

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  • Method for preparing mixed fatty acid from hogwash oil and use method of mixed fatty acid
  • Method for preparing mixed fatty acid from hogwash oil and use method of mixed fatty acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Embodiment 1: Utilize hogwash oil to prepare mixed fatty acids

[0049] Specifically include the following steps

[0050] 1) The hogwash oil recovered from the catering industry is separated and removed from protein and other food residues, and after pretreatment such as precipitation and impurity removal, acidification degumming, steam cooking deodorization, vacuum dehydration, etc., it is poured into the acidification tank, the hogwash oil is heated and stirred, and sulfuric acid is added Perform acidification treatment, let the lower layer of wastewater stand still, collect it for acidification, then wash it with hot water until it is neutral, then discharge the wastewater, and collect it for acidification.

[0051] 2) The neutral acidified oil is metered and injected into the hydrolysis tank 1, 10% sulfuric acid, 1% catalyst and 50% distilled water are added in proportion, the temperature of the oil bath is controlled at 101-110° C., and the hydrolysis is carried ou...

Embodiment 2

[0055] Embodiment 2: Utilize the mixed fatty acid prepared by hogwash oil of the present invention to produce products such as unsaturated and saturated fatty acids. The specific steps 1) to 5) of this example are the same as those in Example 1, and step 6) is also included. Step 6) is as follows: put the mixed fatty acid obtained in the above step 5) into a freezing pot, control the temperature at 0-4°C, and freeze for 24 hours , process the frozen mixed fatty acid by cloth extrusion method, the liquid part is mixed unsaturated fatty acid, and the solid part can be heated to 95 ℃ to obtain saturated fatty acid such as stearic acid, which can be used in industrial fields such as rubber, printing and dyeing, plastic additives, etc. .

Embodiment 3

[0056] Example 3: Production of oleic acid and linoleic acid products using the mixed fatty acid prepared from hogwash oil according to the present invention.

[0057] The specific steps 1) to 5) of this embodiment are the same as in Example 1, and also include step 6), and step 6) is as follows: the mixed fatty acid obtained in the above step 5) is pumped into a freezing pot, stirred continuously, and the fatty acid is frozen , emulsification separation and distillation treatment, the qualified oleic acid and linoleic acid are distilled out, which is a product of deep processing of the unsaturated part of mixed fatty acids and is widely used.

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PUM

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Abstract

The invention discloses a method for preparing mixed fatty acid by using waste cooking oil and the application method of the mixed fatty acid. The preparation method comprises: 1) the waste cooking oil is pretreated; 2) concentrated sulfuric acid is added into an oil layer which is then turned over and cooked and stands; the mixture is washed by hot water and stands, and the waste water at the lower layer is discharged; the obtained product is washed by water repeatedly until acidated oil with the pH value of 6-8 is obtained; 3) the acidated oil, distilled water, sulphuric acid and a catalyst are added in a reaction vessel, heated, stirred, and hydrolyzed and then stand; the waste water at the lower layer is discharged; the mixture is washed by hot water and stands, and the waste water at the lower layer is discharged; the product is washed by water repeatedly until the discharged water is neutral; 4) the step 3 is carried out again, and crude fatty acid can be obtained by secondary hydrolysis; 5) the mixed fatty acid product is obtained by thermal dehydration and negative pressure distillation. The method has high synthetic efficiency, low requirements for equipment as well as low investment and preparation cost; the prepared mixed fatty acid has high activity, strong fluidity and remarkable flotation performance when being applied to the aspect of ore dressing flotation, thereby having stronger competition strength and good application prospect.

Description

technical field [0001] The invention relates to a method for preparing mixed fatty acids from hogwash oil and an application method of the mixed fatty acids. Background technique [0002] Oleic acid has been widely used in flotation as a beneficiation agent, and has a place in hematite oxidized ore flotation, but the flotation effect is not ideal. Highly unsaturated fatty acid linoleic acid and linolenic acid have better flotation performance than oleic acid, but their application is limited due to high price and other reasons. [0003] The method for producing mixed fatty acids (mixed fatty acids are mainly composed of highly unsaturated fatty acid linoleic acid and linolenic acid) generally has the following five processes: one is saponification. The process has simple equipment, convenient operation, short cycle and good product quality, and is suitable for small chemical production. But there is the disadvantage of unreasonable application of acid and alkali. The seco...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/09C11C1/04
Inventor 孙伟曹学锋欧阳魁胡岳华
Owner CENT SOUTH UNIV
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