Chemical process - to the requirement of vacuum pump

in many chemical companies, such as water, electricity, compressed air vacuum equipment is indispensable in the public facilities. Vacuum is usually used to remove the air or water vapor, to prevent interference process. Vacuum can also improve the efficiency of the reaction process and the recovery rate of important compounds.

in the condition of vacuum, the boiling point of the liquid is reduced, this is very helpful for heat-sensitive materials processing. Under the vacuum state, from a liquid solid of the final product is uniform, and almost no hole caused by air bubbles.

in addition, under the vacuum processing and transfer of corrosive compound safer.

1。 The role of vacuum in chemical process

remove the oxygen and water vapor in the air, If these ingredients combined with process composition, chemical reaction will change) ;

considering efficiency and production, remove the excess of reactants or unwanted by-products;

in the distillation process to reduce the boiling point of the mixture;

through the elimination of solvent drying materials;

use differential transport materials.

2。 Various methods for vacuum

vacuum is generated by the vacuum pump. There are different types of vacuum pump. In order to obtain low voltage and high pumping speed, multi-stage vacuum pump can series and parallel to form a vacuum system. However, all of the vacuum system consists of a main pump or vacuum pump, referred to as the exhaust pump. According to the different methods of extraction, a vacuum to obtain equipment is divided into the following categories:

automatically intercept and suction gas from inlet to outlet, such as vacuum pump variable volume.

momentum through the injector, the pumping gas were taken away, such as the steam jet pump and ejector atmosphere.

on the expansion of the surface, the gas is absorbed by porous media at low temperature, such as adsorption pump.

the first two kinds of vacuum pump is widely used in chemical industry, but the steam jet pump of high energy consumption, pollution, now rarely used. Adsorption pump will pump gas stored in the pump, no direct emissions into the atmosphere, thus not suitable for industrial application. With vacuum is finding wider and wider application in the field of chemical industry, with composite vacuum system, which composed of multiple series vacuum pump vacuum unit more appropriate.

3。 The chemical process requirement of the vacuum water pump

due to the chemical process of bad working conditions and long working period, vacuum pump must be reliable, durable and stable performance, and it also must have the following features:

can handle all kinds of solvent vapor, won't cause damage to the pump;

not to process and environment pollution;

should reduce waste as far as possible;

vacuum pump should be resistant to corrosion.

can handle flammable gas or steam.

can not damage the pump suction liquid.

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