Method and apparatus for preparing natural vitamin E by rectification-molecule distillation coupling mode

Abstract

The invention discloses a method and an apparatus for preparing natural vitamin E by a rectification-molecule distillation coupling mode. The plant oil is deodorized to obtain a distillate for esterification and alcoholysis, press filtration is carried out to remove sterol to obtain a material flow 1, the material flow 1 is vaporized to obtain a vaporization flow under 100-300Pa at temperature of 180-230 DEG C, the vaporization flow is rectified to obtain a light component shunting and a recombination component, the light component is condensed to obtain a material flow 8, the heavier component is returned to a vaporization program for next circulation, a material flow 5 is lead out at bottom of rectification equipment after multitime cycle and stabilization, molecule distillation is carried out on the material flow 5 at 210-220 DEG C under 1-5Pa, natural vitamin E is obtained by condensing the light component, and a heavy phase is plant asphalt. The invention also provides an apparatus of the above method, and is characterized in that a falling film rectifying tower and a molecule distiller are combined. The apparatus combines the advantages of rectification and molecule distillation, products with good quality and high yield can be effectively obtained, production period is short, and the traditional residual oil which is regarded as low added value can be used.

Description

technical field [0001] The invention relates to a method and a device for preparing natural vitamin E in a rectification-molecular distillation coupling manner. Background technique [0002] Natural vitamin E is a fat-soluble vitamin, which is widely used in the fields of food, medicine, cosmetics and feed due to its good physiological and pharmacological effects, nutritional strengthening value and antioxidant effect. Vegetable oil deodorizer distillate (deodorizer distillate, DD oil) is a by-product of oil refining, its main components are free fatty acids, neutral oils, natural vitamin E, phytosterols, plant hydrocarbons, and a small amount of waxes, pigments, etc. The content of natural vitamin E in DD oil is related to the variety, origin and refining conditions of the raw oil. [0003] At present, the traditional natural vitamin E extraction process is to firstly esterify the deodorized distillate of vegetable oil, convert the free fatty acids in it into fatty acid me...

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Problems solved by technology

[0004] Chinese patent CN101323607 discloses a method of removing sterols by esterification alcoholysis and cold analysis, then by molecular distillation, and finally by silica gel column chromatography to obtain a high content of natural vitamin E; in this patent, only 40% of natural vitamin E can be obtained after molecular distillation. Vitamin E, a higher content of natural vitamin E needs to be separated by chromatography, but the chromatographic separation has a small amount of processing, high difficulty, large dissolution consumption, and high separation cost

[0005] Chinese patent CN101225414 discloses a method for extracting natural vitamin E through enzymatic esterification and two-stage molecular distillation, but the cost of enzymatic esterification is high, the service life of the enzyme is short, and it is difficult to apply mechanically. In addition, it can only be obtained after two-stage molecular distillation 30-40% content of natural vitamin E

[0006] Chinese patent CN1263096 discloses a method of purifying natural VE with a content of 42%-52% of natural VE as a raw material, through extraction with organic solvents such as ketones, alcohols, hydrocarbons, cooling and precipitation, filtration and separation, and concentration of mother liquor. Although the method can increase the content of natural VE by 5-15%, the consumption of organic solvent used is large, the standing cold analysis time is long, and the purification efficiency is low

[0010] It can be seen that the existing molecular distillation or rectification technology cannot obtain high content of natural vitamin E. It needs to be prepared by sophisticated separation technologies such as ion exchange, silica gel chromatography and extraction. The extraction is difficult, the efficiency is low, and the separation cost is high.

In addition, the current industrial extraction of natural vitamin E raw materials is mainly based on the deodorized distillate of soybean oil with high tocopherol content, while the deodorized distillate with low content of tocopherol such as cottonseed oil, rapeseed oil, and rice bran oil is very little Involved, the utilization rate of raw materials is limited, which restricts the further development and utilization of this process

[0011] In summary, although the current means of producing high-content natural vitamin E are feasible and each has its advantages, there are also many defects. Some of them use a large amount of organic solvents, some have too high requirements for equipment, and some have The yield is low, and the overall process is long, the cost is high, and the product quality and yield are not ideal

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