Overview
2l short path distillation kit The pressure difference between the boiling film and the condensing surface makes the steam flow, and a small pressure drop will cause the steam to flow. Operation at 1mbar requires a very short distance between the boiling surface and the condensing surface, and the distiller based on this principle is called short-path distillation. The 2l short path distillation kit has a built-in condenser on the opposite side of the heating surface and reduces the operating pressure to 0.001mbar.
2l short path distillation kit is a thermal separation technology that operates at a pressure of 1~0.001mbar. Its lower boiling temperature is very suitable for heat-sensitive and high-boiling substances.
The 2l short path distillation kit has a cylindrical shell with a heating jacket, a rotor and a built-in condenser, and the film wiper and anti-splash device are precisely installed on the rotor fixing frame. The condenser is located at the center of the evaporator, and the rotor rotates between the cylindrical shell and the condenser. The 2l short path distillation kit consists of a vertical cylinder, a condenser and a rotary wiper.
2l short path distillation kit process:
1. Molecules diffuse from the main body of the liquid phase to the evaporation surface: the diffusion speed in the liquid phase is the main factor controlling the molecular distillation speed, and the thickness of the liquid layer should be reduced as much as possible and the flow of the liquid layer should be strengthened.
2. Free evaporation of molecules on the surface of the liquid layer: The evaporation rate increases with the increase of temperature, but the separation factor sometimes decreases with the increase of temperature. The thermal stability of the material to be processed should be considered as the premise, and the choice of economical Reasonable distillation temperature.
3. Molecules fly from the evaporating surface to the condensing surface: During the process of flying from the evaporating surface to the condensing surface, the vapor molecules may collide with each other or collide with the remaining air molecules between the two surfaces. Evaporation molecules are much heavier than air molecules, and most of them have the same direction of motion, and their own collisions have little effect on the direction of flight and evaporation speed. The residual gas molecules are in a chaotic thermal motion state between the two sides, and the number of residual gas molecules is the main factor affecting the flying direction and evaporation speed.
4. Molecules condense on the condensing surface: As long as there is a sufficient temperature difference between the hot and cold sides (generally 70~100°C), and the form of the condensing surface is reasonable and smooth, the condensation step can be completed in an instant, so choose a reasonable condenser form is very important.
2l short path distillation kit conditions:
1. The partial pressure of the residual gas must be so low that the mean free path length of the residual gas is a multiple of the distance between the still and condenser surfaces.
2. At saturation pressure, the mean free path length of vapor molecules must be of the same order of magnitude as the distance between the evaporator and condenser surfaces. Under these ideal conditions, evaporation occurs from the residual gas molecules without any hindrance. All vapor molecules reach the condenser surface without encountering other molecules and returning to the liquid. The evaporation rate is at the maximum possible at the prevailing temperature. The evaporation rate is proportional to the pressure, therefore, the distillate volume of molecular distillation is relatively small.
Features
2l short path distillation kit features:
1. The 2l short path distillation kit can be carried out at any temperature, as long as there is a temperature difference between the hot and cold sides, the separation can be achieved.
2. During the process of the 2l short path distillation kit, the molecules escaping from the evaporation surface fly directly to the condensation surface without colliding with other molecules in the middle, and there is no possibility of returning to the evaporation surface in theory. Therefore, the 2l short path distillation kit The process is irreversible.
3. The 2l short path distillation kit process is free evaporation on the surface of the liquid layer without bubbling.
4. The separation factor of the separation ability of 2l short path distillation kit is related to vapor pressure and molecular weight.
Compared with ordinary distillation, 2l short path distillation kit has the following characteristics:
1: The separation operation can be realized at the temperature below the boiling point of the material, as long as the pressure of the system 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, The purpose of 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, and the separation operation of the 2l short path distillation kit can be realized below the boiling point temperature, so the evaporation and condensation of the 2l short path distillation kit are a irreversible process.
3: Ordinary distillation has bubbling and boiling phenomena. The separation operation of 2l short path distillation kit is realized below the boiling point temperature, so there is no bubbling and boiling phenomenon, which is conducive to maintaining a high degree of vacuum in the entire system.
Specifications
Product Parts:
|
Parts Name |
Parts number |
|
Heating Mantle |
1 |
|
2 Neck Boiling Flask |
1 |
|
Short Path Distillation Head |
1 |
|
Cow Receiver |
1 |
|
Round Bottom Flasks |
3 |
|
Plastic Keck Clips |
7 |
|
Cast Iron Stand |
1 |
|
Metal Three Finger Clamp |
1 |
Ancillary equipment:
Refrigerated circulator: condensation and reducing waste of materials.
2XZ Rotary vane vacuum pump: provide vacuum source.
Magnetic Heating mantle: energy saving heating and stirring.
