Combined degumming and dewaxing process and refining process of wax-containing edible vegetable oil

Abstract

The invention relates to the field of edible oil processing, in particular to a combined degumming and dewaxing process and a refining process of wax-containing edible vegetable oil. On one hand, the invention provides a combined degumming and dewaxing process of wax-containing edible vegetable oil, which comprises the following steps of: reacting wax-containing crude oil with acid to convert non-hydrated phospholipid in the wax-containing crude oil into hydrated phospholipid, then carrying out hydration degumming and winterization dewaxing, and then carrying out centrifugal separation to obtain degummed and dewaxed oil. The method can simplify the processing flow, reduce the investment of a physical refining system and reduce the building area of a workshop. In addition, chemical refining is avoided, VE sterol and oryzanol are reserved to the maximum extent by adopting physical refining on the premise of high yield of finished product oil, and the contents of VE sterol and oryzanol both exceed 10000ppm.

Description

technical field [0001] The invention relates to the field of edible oil processing, in particular to a combined degumming and dewaxing process and a refining process for waxy edible vegetable oil. Background technique [0002] The production of all waxy edible vegetable oils is processed through refining processes such as crude oil removal, degumming, deacidification, desolventization, drying, decolorization, deodorization and winterization dewaxing. With the development of modern society, people pay more attention to healthy eating oil, and the market also prefers to use related rice oil, corn germ oil, sunflower oil and rapeseed oil with a small amount of wax. However, the processing and refining of these kinds of oils must be winterized. Wax (grease) process, winterization dewaxing process is to freeze the oil at low temperature, so that the wax with high freezing point or high melting point solid fat is crystallized, and then separated by solid-liquid separation, but the...

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Problems solved by technology

[0004] (1) The existing simple freezing and crystallization requires a long freezing time for simple oil freezing (different types of oils have different freezing times, as short as ten hours and as long as 30 to 40 hours). This method has a slow winterization reaction and wax high oil content;

[0005] (2) The existing one is combined with the neutralization alkali refining section, and the free fatty acid in the oil is used to neutralize the alkali refining reaction, then cool down after the winterization dewaxing reaction, and then separate the soapstock and wax fat through a disc centrifuge; this method will There is a loss of oil saponification and a loss of beneficial ingredients oryzanol and phytosterol;

[0006] (3) In the prior art, there is also a method of adding diatomite crystallization nuclei in order to shorten the time (the dewaxing time can be within 20 hours). If diatomite is added, the disc type cannot be used due to the solid minerals therein. Centrifuge separation, the subsequent separation can only be filtered by a filter. If the amount of wax is small and the hardness of the wax is high, the filtration operation is not difficult, but once the amount of solid wax is large or the hardness is low, dewaxing filtration is very difficult. Operation, which seriously affects the processing capacity of the production line, especially rice oil, due to its high wax content, high wax viscosity, and low hardness, the traditional dewaxing process has the problems of difficult operation, high consumption, and low yield.

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