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Optimizing Büchi® Rotary Evaporator Applications

(joules/mol)

Molecular weight (g/mol) x 3,600 sec./hr.

Example:

From the previous example, we determined the rate of evaporation for Hexane to be 12,183 g/hr. The vapor pressure temperature in this example was assumed to be 40°C, therefore the condenser temperature should be 20°C.

What heat removal capacity is required for Hexane to be evaporated under these conditions?

Heat Removal Capacity (watts) =

Rate of Evaporation (g/hr.) x HvapSolvent (joules/mol)

Molecular weight (g/mol) x 3,600 sec./hr.

=

12,183 g/hr. x 31,912 j/mol

86.2 (g/mol) x 3,600 sec/hr.

=

1,253 watts

Based on the following graph, the Lauda Recirculating Chiller Model WK-1200 would provide sufficient cooling capacity for this application. As a general guideline, the following table can be referenced for selecting an appropriate
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Source:


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