Short Path Distillation Chemistry For Sale

Many such as heavy petroleum residues, chemicals, medicines and natural foods, health products, fatty acids, etc., are often heat-sensitive, viscous and/or have high boiling point materials. To separate these materials from their other components, while maintaining the quality of the product, rectification can only be performed at low or even sub-boiling temperatures, and the thermal decomposition can only be removed in a short period of time. Or polymerization is minimized to eliminate damage to the product. Then, cdu 1000 distillation is the best experimental equipment.
 

Operation process:

The short path distillation chemistry consists of a cylinder with jacket heating, laboratory water circulation pump and short path distillation vacuum pressure and other components.
The distillation process is: the material is added from the top of the evaporator, and is continuously and evenly distributed on the heating surface by the material-liquid distributor on the rotor, and the film scraper scrapes the product into an extremely thin, turbulent liquid film. During this process, the light molecules escaping from the heating surface are condensed into liquid on the condenser almost without collision, and flow down the condenser tube and discharged through the discharge tube at the bottom of the evaporator; the residual liquid is heavy Molecules are collected in a circular channel under the heating zone and flow out through a lateral discharge tube.  

Short path distillation how it works?

Distillation is a method of separating mixed liquids in chemical unit operations. It is divided into atmospheric distillation and vacuum distillation. It mainly uses the different volatility of each component in the mixed liquid to achieve the purpose of separation. That is to say, the separated When the saturated vapor pressure of the light component liquid is greater than the pressure of the system, the material can be separated, so the lower the pressure in the system (the higher the vacuum degree), the easier it is to be separated. Molecular distillation is the introduction of saturated steam on the basis of ordinary distillation. The concept of pressure and molecular mean free path captures and accumulates the light component molecules separated from the main body of the liquid phase at the fastest speed, that is, the distance from the heating surface to the condensation surface is equal to or less than the escape free path of the light component molecules, but It must be larger than the molecular mean free path of the heavy components. In order to obtain a good capture effect, the condensation area should be larger than the evaporation area to achieve the purpose of molecular distillation. However, due to the influence of the equipment structure, the actual equipment cannot achieve the ideal molecular distillation conditions. , can only approach or simulate molecular distillation, so we call it short path distillation.

Factors affecting the separation ability of Short Path Distillation:

1. The diffusion rate of light components in the mixed liquid from the liquid phase body to the heating surface.
2. The saturated vapor pressure of the light components and the vacuum degree of the system.
3. The speed of light component molecules escaping to capture and condensation accumulation (that is, the distance from the heating surface to the condensation surface).

In view of the above working principle, in order to improve the diffusion speed of light components from the liquid phase body to the evaporation surface, a scraping film type is used to scrape the material evenly on the heating surface into a thin film, so that the light components in the mixed liquid are The diffusion speed from the liquid phase main body to the evaporation surface reaches the maximum, and the diffusion time is very short. A built-in condenser is placed inside the equipment, so that the distance between the heating surface and the condensation surface is less than or equal to the molecular mean free path of the light component, and the evaporation Molecules escaping from the surface can fly and condense onto the condensation surface without hindrance, so that the collection and accumulation of light components reaches the fastest limit speed. A high vacuum is maintained inside.

 

Short Path Distillation Features:

Compared with ordinary distillation, short path distillation chemistry (molecular distillation) has the following characteristics:
1: The separation operation can be realized at the temperature of the material's boiling point, as long as the system pressure is lower than the saturated vapor pressure of the light component of the material and the distance between the heating surface and the condensation surface is less than or equal to the molecular mean free path of the light component, separation can be achieved.
2: Ordinary distillation is operated above the boiling point temperature of the material, so evaporation and condensation are a reversible process, short path distillation chemistry (molecular distillation) The separation operation can be realized below the boiling point temperature, so short path distillation chemistry (molecular distillation) Evaporation and condensation are irreversible processes.
3: Ordinary distillation has bubbling and boiling phenomena, short path distillation chemistry (molecular distillation), the separation operation is realized below the boiling point temperature, so there is no bubbling and boiling phenomenon, which is beneficial to the whole system to maintain a high degree of vacuum.
 

Short Path Distillation internal structure:

ZZKD is a professional manufacturer of short-path distiller (molecular distillation). While digesting and absorbing technology, combined with the company's professional and technical personnel's understanding of molecular distillation, we have designed and manufactured a precise and accurate short-path distiller (molecular distillation), For different materials, choose different scraping film forms to meet different process requirements, and at the same time, there are a variety of built-in condensers in different forms to choose from, to meet the materials of different molecular mean free paths, reasonable configuration and precise and accurate processing, Ensure the distance between the evaporating surface and the condensing surface, and the boring and polished evaporating surface makes the material flow more smoothly.
 

System device configuration:

Reasonable system configuration can not only ensure the normal operation of short path distillation chemistry (molecular distillation), but also avoid unreasonable investment. Generally speaking, the operation vacuum of short-path distillation (molecular distillation) is relatively high, so before entering the short-path still (molecular distillation), light components ( Non-condensable gas, low boiling point residual part) is removed first. Practice has proved that the wiped film evaporator is an ideal pre-removal device, and the selection of the combined wiped film evaporator can ensure that the short-path distiller (molecular distillation) is in a high vacuum state. normal operation.

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