普华甜菊糖
PUHUA STEVIA
PUHUA STEVIA
release time：2020-06-08 9092People browsing
Using membrane technology provides an economic, reliable and simple method, usually first using more than the filter to remove the impurities and macromolecular substances in the stevia extract, to achieve the purpose of purification and decolorization, followed by reverse osmosis to concentrate the stevia superfiltration solution, and the water through the membrane can be recycled for recycling.
① performed the water treatment to make the pure water
Using membrane technology, the application of electrodialysis or microporous filtration, in the case of no heating, can be separated water impure substances, such as salt, bacteria and suspended solid, so that pure water to meet the extraction of stevia pond famous process requirements, especially the application of more filtration or penetration, can make high purity water.
②Elimination and decolorization of the stevia extract
Usually, the removal and removal of stevia extraction adopts chemical flocculation precipitation, centrifugal separation, solvent extraction, ion exchange and driving methods, which not only has high cost, low efficiency and unstable product quality. Due to the application of membrane technology, the use of tangential microfiltration, the feed liquid on the membrane surface tangential flow, through the liquid vertically flowing away from the membrane surface and. The same substance deposited on the membrane surface does not exceed a certain thickness controlled by the speed of the feed liquid, and the passage resistance of the membrane will no longer increase at a certain value. Therefore, the stevia extract can be treated continuously to achieve a satisfactory effect.
The test results show that the closed 20,000 ultrafiltration films can be removed by 45%. The decolorization rate reaches 90%, and the crude products are not easy to moisture solution, saving a lot of energy and labor costs, reducing the production costs, and improving the product quality. In the future, if the domestic ultrafiltration membrane with a molecular weight of 1~2,000 is successfully intercepted in China, the impurity removal rate will reach more than 90%, which can greatly simplify the extraction process of stevia.
③Stevia extract and was separated, concentrated and refined
Using ion exchange, adsorption, activated carbon decolorization, vacuum film concentration and step by step crystallization, the same cost is high energy consumption and low efficiency.
Using membrane technology provides an economic, reliable and simple method, usually first using more than the filter to remove the impurities and macromolecular substances in the stevia extract, to achieve the purpose of purification and decolorization, followed by reverse osmosis to concentrate the stevia filtration solution, and the water through the membrane can be recycled for recycling. Compared with conventional vacuum distillation, the concentration of stevia superfiltrate with reverse osmosis has the advantages of fast water outlet speed, low heating temperature, small footprint, and significant energy saving effect, and improves the product quality. In addition, through the concentration test of 40% and 70% alcohol (aqueous solution) stevia glycoside, the separation effect of intimate reverse osmosis is good, but also suitable for the concentration of a certain concentration of alcohol solution products.
