hybrid stills is a separation technique carried out under high vacuum conditions. The distillation process is irreversible and does not boil. It is characterized by low temperature of hybrid stills, high vacuum degree of system, short heating time of materials and high separation degree. Suitable for separation of high boiling point, sensitive to heat and easy oxidation of substances. It is widely used in the pharmaceutical industry, petrochemical industry, food industry, cosmetic industry and agriculture to extract the active ingredients of vitamins and herbs.

hybrid stills:

1. Falling film molecular hybrid stills

The device uses gravity to drop material from evaporating surfaces into a liquid film and drop it. When the material is heated, the evaporates may condense on the condensing surface in the opposite direction. Falling film device is an early form, which is simple in structure and has a thick liquid film on the evaporation surface, so it is inefficient and rarely used in various countries at present.

2, wipe the membrane molecule hybrid stills

Wipe film molecular still and its technological application were not studied in China until the late 1980s. The material on the evaporating surface is caused by gravity to drip into a liquid film, but in order to make the thickness of the liquid film on the evaporating surface thinner and evenly distributed, a rotary scraper made of hard carbon or PTFE is installed in the still. The installed plate scraper not only fully agitates the downstream liquid layer, but also accelerates the renewal of the vaporized surface liquid layer, thereby enhancing the heat and mass transfer process of the material.

Its advantages are that the liquid film is very thin and flows along the surface of evaporation. The residence time of distillate at working temperature is short, the risk of pyrolysis is low, and the distillation process can be continued, and the production capacity is large. Disadvantages are the difficulty of completing the liquid dispensing device and ensuring that all evaporating surfaces are uniformly covered by liquid film.

However, because of its relatively simple structure and relatively low cost, the device is currently used in most laboratories and industrial production.

3. hybrid stills

The device sends the material into the center of a high-speed rotating turntable, causing it to expand on the rotating surface to form a film, heat and evaporate, while condensing on the opposite condensing surface. The device is currently relatively ideal for molecular hybrid stills. However, compared to the other two devices, it requires a fast rotating turntable and requires higher vacuum packaging technology.

Centrifugal molecular distillers have the following advantages over wipeable membrane molecular distillers: High speed rotation of the rotary table results in a very thin liquid film, more uniform liquid film distribution, increased evaporation rates and separation efficiency, and evaporation of materials. Short surface heating time reduces the risk of thermal decomposition of thermal sensitive materials, improves the processing capacity of materials, and is more suitable for continuous industrial production.

hybrid stills https://www.hzzjde.com/Hybrid_Stills/