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Centrifugal extraction machine the principle of separation of saponins compounds

by:Deyuan      2020-08-23
The extraction of saponin compounds machine centrifugal extraction solvent extraction can be used to extract, according to the nature of the saponin compounds and structure. Because of the saponins soluble in water. Its nature and saponins of different composition and structure, has a very important role in industry.
   ( 1) Characteristics of saponins molecules is big, not easy to crystallization, mostly white or milky white amorphous powder, centrifugal extraction machine only a few for crystals, such as ivy saponins for the needle crystal. The crystallization of saponins yuan have mostly intact. Because of the separation technology developed rapidly in recent years, high purity of saponins of crystal shape. As in the past as a single component of amorphous digitalis saponins, has been proved for complex mixtures, and isolated by five kinds of single crystal form of saponins. More saponin is hygroscopic.
   ( 2) Most of saponins have bitter and spicy, Chinese herb extraction technology on the human body each part of mucous membrane have strong excitant, especially the most sensitive nasal mucosa, sucked nose that can cause sneezing. So some oral saponins can stimulate the gastrointestinal mucosa, used for expectorant cough. And some saponins didn't the nature of the case really glycosides has striking and strong sweet taste, and weak in the stimulation of mucous membrane.
   ( 3) Solubility in most saponin contain more sugar, polarity, soluble in water, water dilute alcohol, methanol and hot ethanol, almost insoluble or poorly soluble in ether, benzene, acetone and other polar organic solvents. Saponins in aqueous n-butyl alcohol has good solubility, and can and moisture into two phase, can use this property from aqueous solution using butanol or amyl alcohol extract saponins, which separated from hydrophilic big sugar, protein, etc. Saponin hydrolysis into secondary saponin, solubility in water, soluble in medium polarity of alcohol, acetone, ethyl acetate; Saponin hydrolysis into more completely after its lipotropy sex is strong, insoluble in water and soluble in petroleum ether, benzene, ether, chloroform and other low polar organic solvents.
   ( 4) Surface active role of saponins has the effect that reduce the surface tension of aqueous solution, its aqueous solution by the strong vibration can create persistent foam, not disappear because of heat. Saponins have the function of the emulsifying agent, so it can be used as a cleaner instead of soap and detergent. Saponins have surface activity, can produce bubbles and can be used as emulsifier, is due to its molecular lipophilic saponins in yuan parts and hydrophilic polysaccharide can achieve appropriate proportion, and the ratio of the two parts of appropriate can show the surface activity. If the ratio is not appropriate, the hydrophilic part is stronger than lipotropy, or fat than hydrophilic, molecular internal balance, surface active role is not easy to show it. So many saponins have no blister or blister is very weak, such as foamability of glycyrrhizic acid is very weak, yam saponins, slender yam saponins poorly soluble in water and insoluble in water, such as mixed water when the vibration wave nature is not easy to produce bubbles. Raw material liquid mixed with the extracting agent fully contact, complete the solute mass transfer process;
weight according to certain proportion respectively from two two phase solution and feeding tube into the drum shell ring gap formed between the mixed zone, with the aid of the rotation of the drum, through the turbine disc and the impeller to make two phase mixing and dispersing quickly, two phase solution fully mass transfer. Complete mixing and mass transfer process. Extraction and extraction residual phase separation process;
mixture under the action of vortex disk into the rotary drum, in the plate to form the bulkhead area, mixture quickly with synchronous rotary drum, in under the action of centrifugal force, the heavier than major phase fluid in the process of upward mobility and gradually away from the drum center on the drum wall; Small proportion of liquid phase gradually away from the drum wall and on to the center, after clarification of two phase fluid end respectively through their weir plate into the collection chamber and the tube was closed to derivation, respectively, to complete two phase separation process. From the extraction phase and extraction phase extractant recycling process.
usually use the method of distillation recycling extracting agent. Removal after extraction of proportion as the extractant extract; After removal from the extraction agent over extraction of proportion of extraction liquid.
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