Short Path Distillation

Short path distillation is a special distillation method mainly used for materials with high boiling point, temperature resistance, high molecular weight, and high viscosity. It is also known as molecular distillation or short range distillation.

This distillation method can complete the separation process in a very short time, hence it is called "short path". Its working principle is based on the principle of molecular distillation, operating at a short distance between the heating and condensing surfaces to achieve efficient separation.

Laboratory SPD for CBD

NCF-10A                                                                        NCF-50A

PID (Process & Instrumentation Drawing)                  CAD (Computer Aided Design)

Pilot SPD for CBD

NCF-100                                                                CAD(Computer Aided Design)

Industrial SPD for CBD

PLEASE Fulfilled Below Chart to Customize:

The Request List of Short Path Distillation
1. Company Information
Company
Website				Field
Contact Person				Email
Contact Number				Social APP
2. Information of Your Mixed Materials to be Purified
Sub-group #serial	Name			Content (W%)	Boiling point(°C) (cor. pressure)	Melting point(°C) (Atmospheric)
A
B
C
D
E
F
Remark	Accurate info for pure substance (Chemical, Molecular formula, CAS)			Weight content in mixed material	Default 101.325kPa( 1atm), If NOT please give us the pressure of your system
(1) What is the viscosity of your mixed materials to be purified? We need the data in RT(25-30°C) and in your heating terperature
1			mPa.s(cp)	RT(25-30°C)	*Fill in the Viscosity in RT(25-30°C)
2			mPa.s(cp)		*Fill in the Viscosity and Temperature in your heating system.
(2) Sensory description What is the appearance of your mixed materials? (a) Solid; (b)Wax; (c)Viscous fluid; (d)Liquid
In RT(25-30°C) , which form is it in?					*Fill in the result of above (a)Solid; (b)Wax; (c)Viscous fluid; (d)Liquid
In your heating temp. , which form is it in?
Supplement: A brief description, for example, what is your mixed material similiar as? Such as water, honey or gasoil etc.
(3) Are there any solid particles in your mixed materials? If yes, what is the content and size of the solid particles?
(4) Is it thermosensitive or photosensitive? (At what temperature there are side effects? Does it need UV light isolation? or other request...)
3. Your Target Subtance
(1) What is your target substance? In the chart of your mixed materials to be purified, A, B, or C?
(2) What is your request of analysis result? After SPD purifying system, what are the purity and related data? Such as the contect of the pointed impurity, single impurity etc.
(3) Any other requests? Such as color, smell etc.
(4) Have you done the Distillation tests before? If yes, do you want to share the data?
(5) Multi-stage separation? If yes, pls show us your details of each stage of separation.
(6) What is the production capacity you want? The Unit: L/H
(7) Any Supplement of SDS? Such as Toxicity, Security data (flammable, explosive, etc.)
4. Auxiliary Equipment & Information
(1) Production site/workshop size
(2) Explosion proof requirements
(3) Is there circulating water in your system?
*When we design the SPD system , we will put the energy saving issues into consideration, so we can make full of the energy in our internal sytem in advance
(4) Is there circulating low-temp. liquid in your system?
*We will judge if we will use the external Cold trap
(5) Do you want to use the rough vacuum in your system?
*Used for vacuum drying after equipment cleaning and degassing at high volume content
(6) Is there a high-temperature heat transfer oil circulation system heated by fuel or gas?
*Can be used for heat exchange to provide heat to the evaporator
(7) Power Supply
*Default is 380V\50HZ\3P\N, and we can supplyall kinds of transformers as well, or we will adjust the powder as your request when we design your system.

Short path distillation separates liquid mixtures by controlling temperature and pressure, which has the advantages of high efficiency, stability, and energy conservation.

They can be divided into the following two types in terms of materials:

◆ Traditional glass distillation equipment: Traditional short path distillation equipment is usually made of glass material. This material has good transparency, can observe the distillation process, and has good corrosion resistance to many chemical substances. However, glass materials may have certain mechanical strength and thermal stability limitations in high temperature and high vacuum environments.

◆ Stainless steel distillation equipment: Stainless steel material is also widely used in the manufacturing of short range distillation equipment due to its excellent corrosion resistance, high-temperature stability, and mechanical strength. Stainless steel distillation equipment can withstand higher operating pressure and temperature, and is suitable for handling chemicals with higher corrosiveness.

The distillation system consists of the following components:

◆ Distillation tower: The distillation tower is the core component of the entire system, with multi-level separation layers. Distillation towers typically contain fillers or plate structures inside to increase surface area and contact time, thereby improving separation efficiency.

◆ Heating system: The heating system is responsible for providing energy to heat the mixture to the desired evaporation temperature. Electric heaters or hot oil circulation systems are usually used to provide uniform heating.

◆ Cooling system: The cooling system is used to quickly condense steam during the fractionation process and convert it into liquid. The cooling system can be cooled by methods such as cold water circulation or liquid nitrogen injection.

◆ Vacuum pumping system: The vacuum pumping system is used to create a high vacuum environment to reduce the boiling point during the fractionation process and reduce the pressure of gas phase components. Usually, vacuum pumps or other high-efficiency vacuum equipment are used to achieve this.

◆ Collection system: The collection system is used to collect purified products and by-products after separation. It can include components such as condensers and collection containers to receive condensed steam.

• Short residence time;
• Low operating pressures to 0.1Pa (100Pa=1mbar);
• Jacket design for efficient heating & excellent heat preservation;
• Low distillation temperature;
• High evaporation rates.

Short path distillation is mainly applied to materials with high boiling point, temperature resistance, high molecular weight, and high viscosity, such as lactic acid, VE, fish oil, dimeric acid, trimeric acid, silicone oil, fatty acid, binary acid, linoleic acid, flaxseed oleic acid, natural pharmaceutical active ingredient extraction, glycerol, fatty acid esters, essential oils, isocyanates, isobutyl ketone, polyethylene glycol, cyclohexanol, etc. Short range distillation operates under high vacuum, therefore it has the characteristics of energy conservation and environmental protection.

The maintenance and upkeep of short path distillation is crucial for the stable operation and service life of the equipment. Here are some recommended maintenance steps:

Compared to thin-film evaporators, short-range distillation (molecular distillation) has the following advantages:

 The distance between cold and hot contact surfaces is shorter, the evaporation efficiency is higher, and the evaporation speed is faster.

 The lower temperature required for evaporation helps to reduce energy consumption and thermal damage of heat-sensitive substances.

However, the structure of short-range distillation is relatively more complex and the price is relatively expensive.

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