Molecular distillation is a special liquid-liquid separation technology, which is different from traditional distillation by the separation principle of boiling point difference, but by the difference of the mean free path of molecular motion of different substances to achieve separation. When the liquid mixture flows along the heating plate and is heated, the light and heavy molecules will escape from the liquid surface and enter the gas phase. Due to the different free paths of the light and heavy molecules, the molecules of different substances will move at different distances after escaping from the liquid surface. If a condensing plate (built-in condenser) can be properly set, the light molecules will reach the condensing plate and be discharged by condensation. The heavy molecules do not reach the condensing plate and are discharged along the mixture. In this way, the purpose of material separation is achieved.
Distillation concentration
Since thin film evaporation, and molecular distillation techniques in particular, are capable of distilling at very low pressures, they are better suited for those with high boiling points and concentrations of heat-sensitive substances. The concentration process mainly refers to the evaporation of the solvent without destroying the useful components. Thin film evaporation and molecular distillation technology in natural and synthetic vitamins, lanolin fatty acids, lanol, palm oil, rice bran oil, fish oil and cod liver oil, natural plant leaf neck root extracts (such as capsaicin, lycopene, pyrethrin, lecithin, beta-carotene, traditional Chinese medicine active ingredients, etc.) are mainly in this category.
Removing solvent
With the development of new domestic and international standards and the continuous improvement of people's living standards, food, drugs, cosmetics, building materials and other chemical raw materials closely related to human beings and their products on the residual amount of solvent restrictions are more and more stringent. The traditional distillation method can not meet the demand of the market, so the technology of thin film evaporation and molecular distillation has become the last choice of people. This type of process is often connected to the extraction means as the last line of quality assurance system for green products.
Free monomers are removed
If the product is a combination or polymerization of two or more monomers, the equilibrium mixture of the reaction often contains the remaining free monomers and the larger molecular weight of the hyperpolymers and byproducts. In order to obtain a pure product, the equilibrium mixture needs to undergo a separation process that removes the free monomers. With the difference of allowable residual amount of free monomer, thin film evaporation and molecular distillation technology can be considered. Typical examples are: epoxy resin, epoxy oil, polyurethane, isocyanate, resin plastics, plasticizers, stabilizers, acrylates; Monostearin glycerides, diglycerides, fatty acid dimers, organic intermediates (such as esters, amine synthetic organic compounds, etc.).
Decolorization and flavor removal
Most organic raw materials and their products need to be decolorized and deodorized. In general, the color is caused by the recombination of components in the mixture, while the taste mainly comes f rom the volatilization of the light components. If the pure product itself is color less and tasteless, the purpose of decolorization and flavor removal can generally be achieved through film evaporation and molecular distillation technology. Typical examples are: organic intermediates, lactic acid, fatty acids and their derivatives, APG, epoxy resin, epoxy oil, plant wax, silicone oil, brake fluid, vacuum pump oil, lubricating oil, paraffin oil, etc.
High boiling point process Preparation/production and boiling range determination
Normally, for every order of magnitude of pressure reduction, the boiling point of a substance can be reduced by 20 to 50 degrees. According to this calculation, the boiling point of a substance at 0.1Pa should be 120 to 300 degrees below its normal boiling point. At present, molecular distillation technology can be applied to the distillation separation of substances with boiling point close to 700 degrees at atmospheric pressure. Such applications are mainly represented by the production of high-grade specialty wax products.
1·The distillation temperature is low, molecular distillation is operated at a temperature far below the boiling point, and the separation purpose can be achieved as long as there is a temperature difference, which is the essential difference between the technology and conventional distillation.
2·The distillation vacuum is high, and a high vacuum can be obtained inside the device. Usually, the technology is operated at a very low pressure, so the material is not easily damaged by ox (Process flow chart) idation.
3·Thin film of distilled liquid, high heat transfer efficiency.
4·The heating time of the material is short, and the distance between the heated liquid surface and the condensing surface is less than the average free path of the light molecules, so the light molecules escaping from the liquid surface almost reach the condensing surface without collision. Therefore, the distillation material is heated for a short time, and the residence time at the distillation temperature is generally between a few seconds and tens of seconds, which reduces the opportunity of thermal decomposition of the material. Under the operation, so the material is not easily damaged by oxidation.
5·The degree of separation is higher, and the technology is not easy to separate the routine
Process flow chart
6·There is no boiling bubbling phenomenon, the technology is the free evaporation on the surface of the liquid layer, carried out at low pressure, there is no dissolved air in the liquid, so the whole liquid cannot be boiled during the distillation process, there is no bubbling phenomenon.
7·Non-toxic, harmless, pollution-free, no residue, can get pure and safe products, and the operation process is simple, less equipment. The distillation technology can separate substances that are difficult to be separated by conventional distillation.
8·Molecular distillation equipment compared with ordinary equipment manufacturing cost is higher, the distillation device must ensure that the system pressure to reach a high degree of vacuum, high requirements for material sealing, and the distance between the evaporation surface and the condensing surface to be moderate, equipment processing difficulty, high cost.
9·The product energy consumption is small, because the distillation technology as a whole separation overheating loss is less, and because of the special structure of the distillation device, the internal pressure is very low, the internal resistance is far less than the conventional distillation, so it can greatly save energy consumption.
1
Low operating temperature (far below the boiling point), high vacuum (no load ≤1Pa), short heating time (in seconds), will not occur thermal decomposition, high separation efficiency, especially suitable for high boiling point, heat sensitive, easy oxide separation;
2
Can effectively remove light molecular substances (deodorization),heavy molecular substances (decolorization) and remove impurities in the mixture; This is a very effective method for the desolubilization of liquid after solvent extraction.
3
The separation process is a physical separation process, which can well protect the separated substance from being polluted, especially to maintain the original quality of the natural extract;
4
It can selectively steam the target product, remove other impurities, and separate more than 2 kinds of substances at the same time through multistage separation;
5
High separation, higher than traditional distillation and ordinary film evaporator;
6
Easy to form continuous production, simple operation;
7
The distillation process of molecular distillation is short and the energy consumption is small.
The temperature control precision of the heating body is high, and the temperature difference can be controlled at ±0.5.
The use of self-developed built-in cold well technology, saving cooling water and vacuum pipeline length, ensuring the high efficiency and high selec tivity of the distillation process under high vacuum (1Pa) in the evaporation chamber.
The evaporation temperature is low, the heat loss is small, the steaming process is short, and the product is easier to save energy.
The system size is small, the pipeline is simplified,Short preheating start time, flexible control.
It can replace the conventional falling film evaporator, used for distillation, purification, concentration and decolorization of food, medicine, petrochemical, chemical and oil chemical products, especially suitable for the distillation and refining of heat-sensitive and easily oxidized biological and chemical industrial products, and can also be used for distillation and separation of high boiling point Specification Table products.
| Specification/Model | Effective heating area M² | Inside diameter of evaporator MM | Total height of evaporator MM | Weight KG |
| JBMD-0.1 | 0.1 | 100 | 1610 | 110 |
| JBMD-0.2 | 0.2 | 150 | 1910 | 230 |
| JBMD-0.5 | 0.5 | 210 | 2650 | 430 |
| JBMD-1.0 | 1.0 | 267 | 3200 | 640 |
| JBMD-2.0 | 2.0 | 400 | 4350 | 1080 |
| JBMD-3.0 | 3.0 | 400 | 5120 | 1520 |
| JBMD-4.0 | 4.0 | 500 | 5860 | 1980 |
| JBMD-6.0 | 6.0 | 600 | 6480 | 3100 |
| JBMD-8.0 | 8.0 | 800 | 7200 | 3580 |
JNBAN vacuum belt dryers have been included in the“ Eleventh Five-Year National Science and Technology Support Program, Zhejiang Science and Technology Department Major Science and Technology Public Relations Project and Zhejiang Province” Major Science and Technology Special (Priority Theme) Social Development Project. There are 4 papers and 6 patent applications accepted, including 4 invention patents, 2 special authorizations, and 10 practical patents. They won the third prize of Zhejiang Science and Technology Progress Award and the first set of products in Zhejiang Province.……
Wenzhou Jinbang Light Industry Machinery Co., Ltd. is a high-tech enterprise integrating R & D, manufacturing and sales. Professional in the production and sales of pharmaceutical, bioengineering machinery and equipment professional enterprises. The company mainly specializes in consulting, scheme design and manufacturing, budget, on-site installation and after-sale maintenance of traditional Chinese medicine extraction equipment, concentration equipment, separation and purification equipment, alcohol recovery equipment and drying equipment.……
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