For the refining process of liquid products, the last step is often distillation. The main purposes are: to maintain the physical and chemical properties of the product; the refining yield of the product is as high as possible; taking the product as the positive fraction, to remove the low boiling part as the solvent and the high boiling part of the waste material, so as to achieve the product quality index. Liquid products usually have the heat sensitivity of thermal deterioration, so it is very important to achieve refining at a lower temperature.
Similarly, from the consideration of economy and environmental protection, the removed solvent must be recycled. The refining of liquid products is required to be carried out under high vacuum as much as possible, and the normal operating pressure is below 10Pa (one standard atmospheric pressure is 101325pa). There are two kinds of single pumps, slide valve vacuum pump and claw pump, and roots vacuum unit.
(1) Roots vacuum unit.
Its operating power is quite high. For the unit with the same pumping capacity of the front stage pump as the lh-70ph claw pump, the unit power is 20kW. For the vacuum generating device running continuously day and night, the difference of 12.5KW means the difference of electricity cost of 90000 yuan (calculated by 300 working days and nights every year) after one year. 1 yuan / kWh).
(2) Spool pump.
It must have a vacuum pump to work effectively. When the gas flows through the vacuum pump, it is inevitable that the vacuum pump oil will be entrained out. This means that the recovered solvent cannot be applied directly, or the environment can be wasted and polluted. In addition, the slide valve pump requires high operation and maintenance. In the cold season, if the switch is a little careless, it is very easy to damage.
(3) Claw pump.
Using claw pump, there is no problem in recovering solvent under normal pressure after pump. In addition, due to its good structure, excellent processing and complete accessories, once put into use, it has low requirements, wide range of use, long service life and convenient cleaning and maintenance. When a higher vacuum is needed, it can be used as a front stage pump to form a vacuum unit conveniently.
It can be seen that in the case of high vacuum refining of liquid products, claw pump is a quite reasonable option.
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