How to Choose Correctly and Use Vacuum Pump in Distillation Industry
The so-called vacuum distillation is one of the distillation methods. It is usually used to separate substances that are easy to decompose when heated to boiling point at atmospheric pressure, or to combine with other distillation methods (such as steam distillation) to reduce distillation temperature and improve separation efficiency. Used for separation and purification of chemical, organic, metal compounds, metal alkoxides, etc. Vacuum distillation is also used for deep purification of some special gases. Some compounds have very high boiling points. In order to boil these compounds, it is better to lower the pressure at which they boil than to raise the temperature. Once the pressure is reduced to the vapor pressure of the compound (at a certain temperature), the compound begins to boil and distillation can proceed. This technology is called vacuum distillation and is commonly used in laboratories in the form of vacuum carburetors.
Vacuum pump is widely used in the industrial production process of vacuum distillation, so how to correctly select and use the vacuum pump is particularly important.
Here are some matters needing attention in the process of using vacuum pump:
1. What is the required vacuum degree and pumping speed in this vacuum distillation process?
2. Is the exhausted gas flammable or explosive?
3. Is the extracted gas corrosive?
4. Pipeline connection of the exhausted gas.
5. Whether the extracted gas contains condensable gases such as water vapor or not.
Next, see which vacuum pumps are used for distillation.
Which vacuum pump is the best choice for toluene distillation under low pressure in laboratory?
(1) Let’s see what kind of vacuum pump you want to use. Generally, vacuum pumps are used in experiments. They are mainly micro-vacuum pumps. Their advantages are small size, low noise and easy maintenance.
How much vacuum you can achieve depends on the surface pressure or the limit vacuum. The surface pressure is the value displayed by the external vacuum meter. For example, the surface pressure of 80KPA means that 80KPA is pumped.
Limit vacuum means the actual internal vacuum condition. For example, 10 Pa means that the internal vacuum is 10 pa. This vacuum is sufficient for general laboratories.
Generally, the vacuum of water pump can reach 0.05 atmospheric pressure, the leakage point must be less, and all the grinding points should be coated with vacuum oil ester.
Generally, the vacuum of oil pump can reach 0.04 atmospheric pressure. Oil pump can maintain vacuum better than water pump.
If you make a general vacuum distillation laboratory with the most common and cheapest water pump, as long as the seal is good, it is no problem to reach 0.1 atmospheric pressure.
Application and Improvement of Vacuum Distillation-Roots Vacuum Pump
In order to solve the problems of Roots vacuum pump in distillation engineering, two aspects of technology and equipment are adopted to tackle the key problems. After analysis and research, our company believes that we should consider the factor of improving vacuum degree at present. In theory, the increase of temperature will accelerate the speed of resinization of materials, and the long residence time of materials will increase the amount of resin. The best way to solve these two problems is to increase the vacuum degree in the pot.
Firstly, the boiling point of the material can be reduced by increasing the vacuum, that is, the bubble point temperature in distillation operation can be reduced.
Secondly, increasing the vacuum can increase the driving force of distillation and accelerate the rate of material evaporation.
In the distillation process, the vacuum equipment we used in the past is the ordinary W 150 reciprocating vacuum pump. Its performance parameters are the pumping rate is 150 L/S, the limit vacuum degree is 2600 pa, and the motor power is 15 kw. The present method is to use ZJ300 Roots vacuum pump with high vacuum in series with W150 reciprocating vacuum pump, which will greatly improve the vacuum degree and the pumping rate.
EVP Vacuum Equipment Co., Ltd. is a professional manufacturer of vacuum equipment, with years of experience in sales and maintenance of blower, vacuum pump and air compressor equipment. With equipment and production line, independent R&D team, self-research core mainframe, solid quality, more secure after-sales. The main engine of the distillation vacuum pump is specially processed, wear-resistant, corrosion-resistant and long life. The efficiency of the main engine is increased by 14% by customizing the rotor, bearing and gear. The localized products are suitable for the domestic climate environment with high temperature, dust and high humidity. They can run at low energy consumption for 24 hours.
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