On the profit of optimum control in batch distillation

✍ Scribed by L.H.J. Kerkhof; H.J.M. Vissers

• Publisher: Elsevier Science
• Year: 1978
• Tongue: English
• Weight: 755 KB
• Volume: 33
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(78)85187-2

✦ Synopsis

Usmg a profit function In which the start-up time and severaL cost factors are taken mto account opttmum reflux poltctes for binary batch dlsttllatton processes wtth negligible hold-up are calculated The optimum In controlling IS compared with the conventtonal constant-overheads composttion and constant reflux pohctes Calculattons are made for a wide vartety of cases It IS possible to systemtse the results by mtroducmg two dlmenstonless numbers The first number contammg onty process parameters IS a measure of the dtfliculty of a separation The preference for one of the three reflux pohcles constdered will be found to depend strongly on this number The second dImensionless number combines the influences of the cost factors and the start-up time By means of these aumbers a simple rule of thumb ts formulated whtch predicts when optimum control IS worth while I MTRODUCTlON Research mto dynamic optlmfsatmn of batch dlstlllation processes has been carried out by several mvestlgators Converse and Gross[ II have determmed the optimum reflux ratlo pohcy for a specified duration of operation The optimum pohcy resulted In product yields of up to 5% over conventlonal