In the chemical production process, according to the specific work required by the work pressure level and the nature of the suction gas to choose a reasonable vacuum pump, generally determine the specific process required pressure, vacuum distillation, distillation, sublimation and other processes required vacuum Degree of high (low pressure), vacuum evaporation, drying, condensation, crystallization, dehydration, bleaching, chemical reaction absorption and vacuum conveying materials and other processes require a low degree of vacuum (high working pressure). Working pressure is determined, according to the size of the amount of suction and the nature of the suction gas to choose a reasonable vacuum pump.
1, according to several types of vacuum pump work pressure can be achieved to list the scope of application of various vacuum pumps.
2, suction of different gases to choose a different jet vacuum pump (1) water jet vacuum pump is suitable for working pressure greater than 25mmhg (3.3KPa), sucking a variety of gases, especially in condensable condensable vapor (ie, Condensed gas condensation), with dust, granular media, its advantages are more prominent. When the work pressure is relatively small, non-condensable pumping gas volume is larger, you should choose steam jet pump and steam in series, steam jet spray combination.
(2) The working pressure of series water jet vacuum pump can reach 2mmhg (267Pa), but it is smaller than the new type high efficiency steam jet vacuum pump, steam jet water jet vacuum pump and multistage steam jet vacuum pump, which is suitable for batch production of small and medium-sized enterprises.
(3) The new high efficiency steam jet vacuum pump working pressure can reach 0.5mmhg (65Pa), suitable for most of the gas to be aspirable condensable gas, non-condensable gas occupies a relatively small proportion of the process.
(4) The working pressure of the soda ejector vacuum pump and multistage steam ejector vacuum pump can reach 10Pa, and can suck various gases. The difference between them is that the soda ejector vacuum pump saves the working steam consumption and saves the operation than the multistage steam ejector vacuum pump cost.
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