A method for dewaxing by combining surface crystal copolymerization and alcohol extraction of peony seed oil

Abstract

The invention discloses a method for dewaxing the peony seed oil by combining surface crystal copolymerization and alcohol extraction. The specific steps are as follows: heating the peony seed oil to 70-90°C until the waxy crystals precipitated at normal temperature are completely dissolved in the peony After soaking in the seed oil, cool down to 50-65°C, then add 0.08-0.15% surfactant by weight of peony seed oil, then slowly lower the temperature under stirring conditions, stop stirring when it reaches 5-8°C, grow crystals, and centrifuge. Take the supernatant oil and set it aside; add absolute ethanol solution to the supernatant oil, transfer it to a separatory funnel and let it stand, separate the liquids, remove the lower layer of oil, repeat the extraction once, remove the lower layer of oil, and finally remove the ethanol solution. The invention combines surfactant with ethanol extraction to obtain dewaxed oil with low viscosity, good fluidity and clear color, which improves the poor dewaxing effect of the traditional dewaxing process and the wax esters in the oil cannot be effectively removed. The incoming grease becomes viscous or even waxy prematurely.

Description

technical field [0001] The invention belongs to the technical field of deep processing of peony products, and in particular relates to a method for dewaxing by combining surface crystal copolymerization and alcohol extraction of peony seed oil. Background technique [0002] The oil dewaxing process began in the late 1940s and was fully developed and popularized in the 1970s and 1980s. After the 1990s, with the rapid development of science and technology and the demand for high-quality vegetable oil, the position of dewaxing in the process of vegetable oil refining is becoming more and more important. Since the crystallization of wax in oil does not become solid waxy crystal particles as people imagine, it is impossible to slow down the temperature without limit, that is, the wax cannot all crystallize into large particles. Wax crystals in wax and oil suspensions are a kind of plastic solid particles, which are greatly affected by temperature and pressure. When the temperatu...

AI Technical Summary

Problems solved by technology

Wax crystals in wax and oil suspensions are a kind of plastic solid particles, which are greatly affected by temperature and pressure. When the temperature and pressure change, the wax crystal particles are easily deformed and form fine or tiny particles. In order to avoid suspension In the process of separation and transportation, the wax crystals are crushed by the shear force. In the traditional dewaxing process, centrifugal filtration or plate and frame filtration is generally used. At the same time, the thickness of the filter cloth is very thin. Under the action of centrifugal force and pressure, the wax Some of the crystalline particles become fine particles, and the uncrystallized waxy molecular groups or waxy tiny crystal nuclei in the oil are squeezed and pass through the filter cloth into the dewaxed oil, so that the wax content in the dewaxed oil is far more than normal value

In the existing dewaxing technology, the conventional dewaxing method of freezing and crystallization has the advantages of simple equipment, low investment and easy operation, but the disadvantage is that the oil-wax separation is not complete, the yield of dewaxed oil is low and the cloud point is high

Surfactant degreasing method, the advantage is that it is beneficial to the separation of wax and oil. The disadvantage is that after adding surfactant to the oil, it is difficult to completely separate the surfactant from the oil. The tiny particles of wax residue in the oil cannot be effectively removed by filtration, and the resulting oil will appear viscous or even waxy after 3 months, seriously affecting the quality of vegetable oil, and even premature rancidity of the oil

[0003] As a new resource of peony seed oil, the wax content in the oil has not been clearly determined, and there is no report on the degreasing and dewaxing process of peony seed oil. There is no relatively perfect ideal process for the dewaxing of peony seed oil, and Due to the unique characteristics of the high content of unsaturated fatty acids in peony seed oil itself, the traditional dewaxing process cannot be used simply for dewaxing

Therefore, the dewaxing effect of improving the traditional dewaxing process is not obvious, and the technological research of exploring the degreasing and dewaxing of peony seed oil is the key technical problem and difficult problem to be solved by the present invention

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