Vacuum receiver

For top-feed applications, the most convenient assembly is that shown in Fig. 18-95. The depth of the dam must, of course, be sufficient to contain the total quantity of feed shiny required for the test. Since the test leaf is mounted on top of the vacuum receiver, it is nec-essaiy to provide a valve between the test leaf and the receiver so that the desired operating vacuum may be obtained in the receiver before the start of a test run. It is imperative, however, that there be no restriction in this valve. The preferred choice is a ball valve with the full bore of the drainage piping. 

One or more vacuum receivers (if separation of the mother filtrate from the wash filtrate is needed)... 

Tn a 125-ml. Claisen flask, equipped with a capillary for vacuum distillation and a thermometer, are placed 50 g. (0.3 mole) of isodchydroacetic acid (p. 76) and 2 g. of copper powder (Note 1). A 125-ml. simple distilling flask, cooled by a water jet, is used as a vacuum receiver and is attached to a water aspirator. The Claisen flask is heated at atmospheric pressure in an oil bath at 230 235° for 45 minutes or until the decarboxylation has (eased. The pressure on the system is then slowly reduced, and... 

Vacuum distillation, see Distillation under diminished pressure Vacuum receivers, 103, 108, 109, 118, 218f... 

Fignre 7.7b shows the fate of the filtrate as it is sucked from the filter cloth. Two tanks called vacuum receivers are provided for the two types of filtrates the filtrate removed while the segments are still submerged in the tank and the residual filtrate removed when the segments are already out of the tank. Vacuum receivers are provided to trap the filtrate so that the filtrate will not flood the vacuum pump. Also note the barometric seal. As shown, this is in parallel connection with the suction vacuum of the filter. The vacuum pressure is normally set up to a value of 66 cm Hg below atmospheric. Any vacuum set for the filter will correspondingly exert an equal vacuum to the barometric seal, on account of the parallel connection. Hence, the length of this seal should be set equivalent to the maximum vacuum expected to be utilized in the operation of the filter. If, for example, the filter is to be operated at 51 cm. 

Bleaching. The oil is pumped to a slurry tank passing through a preheater at a temperature of 90-95°C. The oil, dried and deaerated under vacuum, receives a predetermined dose of bleaching earth-activated carbon (10 1 ratio), agitated for 20-30 min for the removal of color bodies and other adsorbable impurities. The bleached oil is filtered through a plate and frame filter press and further purified in drum-type polishing filters. 

The various pieces of accessory apparatus can of course be placed where they are most convenient and where a battery of filters is connected into the accessory apparatus the only point to be observed beyond securing the necessary capacities throughout the accessory apparatus is to see that the piping has sufficient fall to secure drainage. The vacuum receivers in the dry system are fitted with a float and vacuum release so that if anything goes wrong with the solution pumps the vacuum apparatus will not be flooded. 

It should also be self-draining into a vacuum-receiver, which collects the solvent as well as maintains the vacuum integrity of the entire system. The condensate receiver should have a sight glass so that visual inspection will indicate when it needs emptying. Obviously the receiver should be large enough to contain all of the condensate from one batch of product. 

Selection Pfaudler glass-lined vacuum receiver of 50 gal capacity... 

Type Glass-lined vacuum receiver. Type VR-50 Rated capacity 50 gal... 

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