"steam distillation unit" refers to a process in which a raw powder or fragment containing volatile ingredients is soaked in water and heated for distillation or with steam distillation. The herb may also be boiled and distilled in a multi-function TCM extraction tank. The volatile ingredients in the herb may be removed with steam distillation and the distilled liquid may be collected after condensation. Generally, it is necessary to re-distillation once to improve the purity and concentration of distillate, and finally collect a certain volume of distillate; However, the number of distillation should not be too much, so as to avoid oxidation or decomposition of some components in the volatile oil. The basic principle of this method is that according to Dalton's law, the total vapor pressure of a liquid mixture that is insoluble to each other and does not react chemically is equal to the sum of the saturated vapor pressures of the components (that is, partial pressures) at this temperature. Thus, although the boiling point of the components themselves is higher than the boiling point of the mixture, the liquid mixture begins to boil and is distilled when the sum of the partial pressures is equal to atmospheres. Indeed, a steam distillation unit is only suitable for extraction of a volatile ingredient that does not appear to be destroyed with steam distillation, and that is insoluble or insoluble in water. The boiling point of this kind of composition is more than 100℃, and water is not miscible or only slightly soluble, and there is a certain vapor pressure at about 100℃. When heated with water, the vapor pressure and the vapor pressure of water add up to one atmosphere, the liquid begins to boil, and the water vapor takes the volatile materials with it. For example, the volatile oil in Chinese herbal medicine, some small molecular alkaloids - ephedrine, naucine, arecoline, and some small molecular phenolic substances. This method can be used to extract paeonol.
Indeed, fluoride may appear in a large number of natural water bodies. Indeed, it may appear in nonferrous metallurgy, steel and aluminum processing, coke, glass, ceramics, electronics, electroplating, fertilizer, pesticide wastewater, and wastewater containing fluoride indeed. The process is usually performed with a pre-distillation process. In a solution containing perchloric acid (or sulfuric acid), water vapor is passed through the solution to be evaporated as fluorosilicic acid or hydrofluoric acid.
1.6 samples can be used for distillation experiment independently at the same time
2. steam distillation unit (" steam distillation unit ") with strict temperature control is better to remove interference and is not likely to boil
3. 7 inches large LCD touch screen control, 6 independent control system
4. 6 independent digital display temperature control, high precision temperature control
5. High purity aluminum module heating, heating speed, high precision
6. Built-in refrigeration compressor, no need for external chiller, low noise
7. Over-voltage and over-current leakage protection system, high stability, improve the service life
8. With steam generator, the steam speed is fast, and the steam rate is adjustable
9. Steam comes with automatic water refill function, safe, simple, convenient and easy to operate
Some volatile components are slightly more soluble in water, so the distillate is often re-distilled to separate the volatile oil layer in the first part of the distillation, or the constituents are extracted in the distilled water layer by salting out with a low boiling point solvent. For example, rose oil, protoanemonin (protoanemonin) and other preparation often use this method. steam distillation unit (" Steam distillation unit ") requires heating of the raw material and is not suitable for the extraction of chemically unstable fractions. Indeed, the value of steam's steam pressure (indeed) is p = p1 + p2 +... + pi, so the pure boiling point of the liquid in the mixture, no matter how high it is, is lower than the liquid with the lowest boiling point in the mixture at the same external pressure. The specific boiling point is determined by the ratio of the two solutions. 2 distillation process spices and water constitute the non-soluble system of essential oil and water, heating, with the increase of temperature, essential oil and water are to accelerate the evaporation, produce mixed vapor, the vapor through the pot top gooseneck into the condenser to get the liquid mixture of water and essential oil, after oil and water separation can be obtained essential oil products. 3. Distillation method: water distillation: raw materials are placed in the sieve plate or directly into the still pot, the pot with water soaked material layer, the pot bottom heating. Water distillation :(water distillation) raw materials placed in the sieve plate, pot to add water to meet the requirements of distillation, but the water must not be higher than the sieve plate, and can ensure that the water boiling to evaporation without splash wet material layer, generally using reflux water, keep the water constant in the pot to meet the steam operation required enough saturated steam, so can be installed in the bottom of the pot speculum, observe the height of the water. Direct vapor distillation: Install a ring tube with holes under the sieve plate, by the external steam directly through the hole, into the sieve to heat the raw materials, but the water dispersion is not sufficient, should be carried out in advance outside the pot, pot distillation is fast and easy to change to pressure distillation. Water diffusion vapor distillation: This is a new distillation technology used abroad. The water vapor enters from the top of the pot, and gradually penetrates into the material layer from top to bottom. At the same time, the air in the material layer is pushed out, and the water dispersion and the essential oil from the mass transfer can enter the condenser at the bottom of the pot without all gasification. The steam is percolated, the distillation is uniform, consistent and complete, and the condensate of water and oil enters the condenser quickly, so the essential oil obtained has good quality, high yield, low energy consumption, short distillation time and simple equipment.
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