November, 1929
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INDUSTRIAL A N D ENGINEERING CHEMISTRY
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Figure 11-Ricard-Allenet
Figure 10-Ricard-Allenet Process; British P a t e n t 214,581 ; Case* 2 b a n d 2 d
(1) The process is very similar to case 2r The condensate, however, from the first recovery column is sent to an auxiliary separator. (2) The water layer from this separator, and also part of the oil layer, is returned as reflux to the first recovery column (3) The rest of the oil layer is added to the regular reflux from the dehydrating column.
These particular features are of no fundamental importance and their value on a commercial hook-up is questionable. [Cases 3a and 3b: British Patent 215,716; convention date (Belgium), May 9, 1923 1
i
Process; British P a t e n t 243,368; Case 46
regular reflux condenser and returned his oil layer to the middle OK base of the column.
[Cases 4a and 4b: British Patent 243,368; convention date (Belgium), November 20, 1924.1
Case 4a covers the dehydrat,ion and purification of impure pthyl alcohol-for example, alcohol denatured with methanol. The water is rectified and then the ternary mixture separated and scrubbed with water as in the Steffens process. The “heads” are further rectified and the %ils” are also rectified. Gase 4b is indicated in Figure 11. The features are as follows:
Case 3a is the process case of the apparatus cases 2a and 2b. Propyl alcohol is dehydrated and the “third” liquid is trichloret hylene. Case 3b is a special case for the dehydration of glycerol. Extra heating elements are used in the dehydrating column. Toluene is the “third” liquid. The water layer is thrown away and the oil layer is returned as reflux (as indicated by I
