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Method for refining lipid

A refining method and oil technology, applied in the direction of edible oil/fat, food science, application, etc., can solve the problems of inability to effectively eliminate or reduce membrane pollution, restore membrane flux, inability to completely remove dirt, long cleaning time, etc. Achieve the effect of less emission, high degree of flux recovery and easy cleaning

Inactive Publication Date: 2009-07-22
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Backwashing, mechanical scraping, negative pressure cleaning, ultrasonic cleaning, chemical cleaning, etc. take a long time to clean, and cannot effectively eliminate or reduce membrane fouling and restore membrane flux.
Conventional cleaning generally cannot completely remove the dirt, and may make the dirt more difficult to clean, resulting in a large amount of acid or alkaline wastewater (Food Research and Development 28(6)(2007): 169-172)

Method used

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  • Method for refining lipid
  • Method for refining lipid
  • Method for refining lipid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Example 1 Refined rapeseed mixed oil

[0048] First step, membrane degumming

[0049] Rapeseed mixed oil (oil content 21.5%) is filtered by plate and frame to remove solid impurities, and then degummed and decolorized through a dead-end filter assembly (membrane MPS-U20-S, filtration temperature 35°C, maintaining working pressure 0.1-0.9MPa) for 25 hours; Wash the ultrafiltration membrane with 1wt% enzyme preparation I (50wt% Candida antarctica lipase, 49wt% porcine pancreas phospholipase A and 1wt% subtilisin) aqueous solution at 45°C for 15min, and wash the ultrafiltration membrane with warm water (45°C) After 10 minutes, the membrane was reused.

[0050] The second step, deacidification by nanofiltration

[0051] Degumming-decolorization mixed oil passes through nanofiltration membrane (membrane NTGS-2200, maintains working pressure 0.1-0.8MPa, temperature 35°C) and operates for 55h; Wash the ultrafiltration membrane for 10 minutes, wash the ultrafiltration membra...

Embodiment 2

[0054] Example 2 Refined soybean mixed oil

[0055] First step, membrane degumming

[0056] Soybean mixed oil (oil content 20.5%) is filtered by plate and frame to remove solid impurities, and degummed-decolorized by cross-flow filter module (membrane MF-50, filtration temperature 40°C, maintaining working pressure 0.1-0.8MPa), concentration ratio (initial Volume / (initial volume of feed liquid-membrane permeate volume)) 8, operation 20h; With 1wt% enzyme preparation I (55.0wt% porcine pancreatic lipase, 44.5wt% streptococcal phospholipase A and 0.5wt% papain) Wash the ultrafiltration membrane with aqueous solution at 40°C for 20 minutes, wash the ultrafiltration membrane with warm water (40°C) for 10 minutes, and reuse the membrane.

[0057] The second step, deacidification by nanofiltration

[0058] The degummed-decolorized mixed oil is passed through a nanofiltration membrane (FilmTec BW30 membrane, maintained at a working pressure of 0.1-0.7 MPa, at a temperature of 40°C)...

Embodiment 3

[0061] Example 3 Refining machine pressed sunflower oil

[0062] First step, membrane degumming

[0063] Machine-pressed sunflower oil plate and frame filter to remove solid impurities, pass through a cross-flow filter module (membrane MPS-U20S, filter temperature 30 ℃, maintain working pressure 0.1~0.9MPa) degumming-decolorization, concentration ratio 6, operate 20h; With 1wt% enzyme preparation I (60wt% porcine pancreatic lipase, 39wt% Aspergillus oryzae phospholipase A and 1 wt% trypsin) aqueous solution at 45° C. to wash the ultrafiltration membrane for 15 minutes, warm water (45° C.) to wash the ultrafiltration membrane for 8 minutes, and then use the membrane again.

[0064] The second step, deacidification by nanofiltration

[0065] Degumming-decolorizing oil is dissolved in ethanol (oil / alcohol, 4:1, w / v), passes through nanofiltration membrane (membrane NFM2221, maintains working pressure 0.1-0.8MPa, temperature 35°C), operates for 45h; with 0.5wt% enzyme Preparat...

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Abstract

The invention provides a method for refining fat. The raw material fat is subjected to degumming treatment at pressure of between 0.1 and 1.0MPa at a temperature of between 25 and 55 DEG C through an ultrafiltration membrane (aperture of between 5 and 10nm) for 10 to 30 hours, is subjected to deacidifying treatment at pressure of between 0.1 and 1.0MPa at a temperature of between 25 and 55 DEG C through a nanofiltration membrane (aperture of between 0.1 and 1.0nm) for 40 to 70 hours, and is subjected to deodorization at a temperature of between 220 and 250 DEG C at pressure of between 50 and 200Pa so as to produce the refined fat. The degumming membrane is cleaned by an aqueous solution containing 0.1 to 5.0 weight percent of enzyme preparation (mixture of lipase, phosphatidase A and proteolytic enzyme), and is cleaned by water to be reused; and the deacidifying membrane is cleaned by an aqueous solution containing 0.1 to 5.0 weight percent of lipase, and is cleaned by water to be reused. The membrane permeability is less attenuated, the membranes have long service life, the process is stable, and the refined fat product has good quality.

Description

technical field [0001] The invention relates to the field of refining fat or oil, in particular to using membrane separation technology to refine oil, and a method for cleaning the membrane with enzyme preparation during use of the membrane. Background technique [0002] The oil produced by solvent extraction or pressing contains a small amount of phospholipids, free fatty acids, pigments and other trace components. The existence of phospholipids, free fatty acids and pigments affects the quality, appearance, nutrition and use effect of oils. In order to meet the edible requirements, the oil must go through a refining process to remove substances such as phospholipids, free fatty acids and pigments. In the oil refining process, phospholipids are hydrated with water and phosphoric acid to settle and centrifuge the phospholipids; the refining process is complicated, the energy consumption is high, the refining effect is not ideal, and the quality of the by-product phospholipid...

Claims

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Application Information

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IPC IPC(8): A23D9/04
Inventor 杨天奎牟英
Owner DALIAN UNIV OF TECH
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