Before the first use of the short path distillation kit, it is necessary to understand its working principle and precautions in advance, so as to avoid misoperation during use and cause losses.
The short path distillation kit is a thermal separation technology process working at a pressure of 1~0.001mbar. Its lower boiling temperature is suitable for heat-sensitive and high-boiling substances.
The short path distillation kit consists of an outermost heated vertical cylinder with a central condenser located in it and a wiper that rotates between the still and the condenser. The material is fed from the top of the evaporator, and is continuously and evenly distributed on the heating surface through the material-liquid distributor on the rotor, and then the scraper scrapes the material liquid into a thin, turbulent liquid film, and spirally Push down. During this process, the light molecules escaping from the surface of the heating surface condense into a liquid on the built-in condenser through a short route and almost without collision, and flow down the condenser tube, passing through the condensate at the bottom of the evaporator. The discharge pipe is discharged; the residual liquid, that is, heavy molecules, is collected in the circular channel under the heating zone, and then flows out through the discharge pipe on the side.
Short path distillation kit are also more suitable for molecular distillation. Molecular flow is directed from the heating surface to the condenser surface.
The Basic Composition of the Short Path Distillation Kit:
Cylindrical barrel with heating jacket, rotor and built-in condenser; the film wiper and anti-splash device are precisely installed on the fixed frame of the rotor. The built-in condenser is located in the center of the evaporator, and the rotor rotates between the cylindrical barrel and the condenser.
The Working Process of the Short Path Distillation Kit:
The short path distillation kit process can be divided into the following four steps:
1. Molecules diffuse from the liquid phase body to the evaporation surface:
Usually, the diffusion speed in the liquid phase is the most important 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. Therefore, the thermal stability of the processed substance should be taken as the premise, and a more economical and reasonable distillation temperature should be selected.
3. Molecules fly from the evaporation surface to the condensation surface:
In the process of flying from the evaporating surface to the condensing surface, the vapor molecules may collide with each other, and may also collide with air molecules remaining between the two surfaces. Because evaporated molecules are much heavier than air molecules, and most of them have the same direction of motion, 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, so the number of residual gas molecules is the main factor affecting the flying direction and evaporation speed.
4. Molecules condense on the condensation 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 condensation surface is reasonable and smooth, the condensation step can be completed in an instant, so it is very important to choose a reasonable form of condenser.
Features of Short Path Distillation Kit:
1. Operate at a temperature far lower than the boiling point of the material, and the residence time of the material is short; it is beneficial to the separation of high boiling point, heat-sensitive and easily oxidizable materials.
2. Effectively remove substances in the liquid such as organic solvents, odors, etc., which is a very effective method for the precipitation of liquids after solvent extraction.
3. Products can be selectively evaporated to remove other impurities, and more than two substances can be separated at the same time through multi-stage separation.
4. The vacuum degree of distillation is high, the vacuum degree can reach below 0.1pa, and a high degree of vacuum can be obtained inside, and molecular distillation is usually carried out at a very low pressure. operation, so the material is not easily oxidized and damaged.
5. The distilled liquid film is thin, the heat transfer efficiency is high, and the film thickness is less than 0.5mm.
6. The degree of separation is higher. Molecular distillation can separate substances that are not easy to separate.
7. There is no boiling and bubbling phenomenon. Molecular distillation is free evaporation on the surface of the liquid layer, and it is carried out under low pressure. There is no dissolved air in the liquid, so the entire liquid cannot be boiled during the distillation process, and there is no bubbling phenomenon.
8. Provide a variety of specifications for customers to choose from, suitable for customers' small-scale experiments and pilot-scale experiments. If a larger evaporation area is required, it can be customized according to customer requirements.
9. Physical separation method, non-toxic, harmless, non-polluting, non-residue, can obtain pure and safe products.
10. The scraper system is made of PTFE material and SS316L stainless steel material, which has the effect of anti-corrosion.
11. The feed tank is optional to realize the preheating function, and the preheating temperature can be adjusted.
12. Each interface is sealed with fluorine rubber gasket, which has good air tightness. If the customer needs corrosion resistance, it can be replaced with PTFE.
Compared with Ordinary Distillation,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 short-path still can be realized below the boiling point temperature, so the evaporation and condensation of the short-path still is an irreversible process.
3: Ordinary distillation has bubbling and boiling phenomena. The separation operation of the short-path still 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.
The Model and Supporting Facilities of the Short Path Distillation Kit:
Our short path distillation kit device mainly has two series: ZNCL series and ZKCL series. The main difference between the two series is that the electric heating jacket is different. There are 5 models in the ZNCL series:
They are ZNCL-SPD-2L, ZNCL-SPD-5L, ZNCL-SPD-10L, ZNCL-SPD-20L
ZNCL-2L Short Path Distillation Kit
ZNCL-5L Short Path Distillation Kit
ZNCL-10L Short Path Distillation Kit
ZNCL-20L Short Path Distillation Kit
There are 5 models in the ZKCL series:
ZKCL-SPD-2L, ZKCL-SPD-5L, ZKCL-SPD-10L, ZKCL-SPD-20L (with custom warm cover)
There are three supporting facilities for short path distillation kit, namely: desktop circulating water vacuum pump, rotary vane vacuum pump and low-temperature coolant circulating pump, among which desktop circulating water vacuum pump and rotary vane vacuum pump can be used. Short-path distillation equipment can be purchased according to your own needs when it is sold.
Desktop circulating water vacuum pump: use circulating water as the working fluid to provide vacuum conditions for the rotary evaporation process;
Rotary vane vacuum pump: It has the advantages of fast pumping speed, small size, light weight, low noise, convenient maintenance, and high ultimate speed;
Low-temperature coolant circulation pump: adopts the principle of mechanical refrigeration for low-temperature cooling, and the lowest temperature can reach -120°C.
Application Fields of Short Path Distillation Kit:
1. Fine chemical industry, such as the purification of aromatic oil, the purification of high polymer intermediates, the extraction of lanolin, etc.
2. Food industry: such as refined fish oil, oil deacidification, refined high-carbon alcohol, separation of mixed oils, etc.
3. Other fields: petroleum industry, daily chemistry, environmental protection, etc.
Precautions when Using the Short Path Distillation Kit:
The short-range molecular distillation apparatus is an instrument that realizes liquid-liquid separation based on the difference in the mean free path of molecular motion of different substances, and can solve problems that cannot be solved by conventional distillation techniques. There are some precautions in operation, which need to be paid attention to during use to avoid malfunction of the instrument due to misoperation.
1. The liquid level of each effect separator needs to be strictly controlled so that it is in a suitable position required by the process.
2. When distilling materials that are prone to crystallization, scaling and clogging of pipelines, plate evaporators, valves and other parts are prone to occur. Therefore, it needs to be washed with water regularly to keep it unblocked, or to take measures such as vacuum pumping to remedy it.
3. The instrumentation of the device needs to be adjusted frequently to make it sensitive and reliable. If the instrument is found to be malfunctioning, find out the reason and deal with it in time.
4. The equipment and pipelines of the short-range molecular distillation apparatus need to be strictly inspected and inspected frequently, especially the sight glass should be inspected frequently and replaced in due course to prevent accidents caused by corrosion.
5. Before overhauling the equipment, release the pressure and discharge the material, rinse with water to cool down, and remove the remaining corrosive liquid in the equipment.
6. Operators and maintenance personnel should wear protective clothing to avoid personal injury caused by hot liquid and hot steam.
Why Choose Us
Professional extraction equipment manufacturer
Zhengzhou Keda Machinery Equipment Co., Ltd. is a family integrating production and trade. Our main product is laboratory extraction equipment. Supercritical extraction is one of our main products. Our short path distillation kit models are: ZNCL series and ZKCL series, and can also be customized according to your needs. The company has been established for more than ten years, providing equipment solutions for tens of thousands of enterprises and individuals at home and abroad, and has won unanimous praise from domestic and foreign customers.
Fast delivery
We have warehouses in Los Angeles in the United States, Valencia in Spain, and Thailand. We can choose the nearest warehouse for delivery according to the customer's geographical location, ensuring that the customer receives the goods quickly.
Perfect after-sales team
We provide a one-year warranty service for the products we sell. We have a professional after-sales team to deal with customers' after-sales problems, and can provide corresponding technical guidance through videos and other methods.
Parameter
Model | Parts name | Parts number |
2L short path distillation | 2000 ml Digital Heating Mantle | 1 |
2L short path distillation | 2000 ml 2 Neck Boiling Flask | 1 |
2L short path distillation | Short Path Distillation Head | 1 |
2L short path distillation | Cow Receiver | 1 |
2L short path distillation | 500 ml Round Bottom Flasks | 3 |
2L short path distillation | Plastic Keck Clips | 7 |
2L short path distillation | Cast Iron Stand | 1 |
2L short path distillation | Metal Three Finger Clamp | 1 |
Model | Parts name | Parts number |
2L short path distillation | 2000 ml Digital Heating Mantle | 1 |
2L short path distillation | 2000 ml 2 Neck Boiling Flask | 1 |
2L short path distillation | Short Path Distillation Head | 1 |
2L short path distillation | Cow Receiver | 1 |
2L short path distillation | 500 ml Round Bottom Flasks | 3 |
2L short path distillation | Plastic Keck Clips | 7 |
2L short path distillation | Cast Iron Stand | 1 |
2L short path distillation | Metal Three Finger Clamp | 1 |
