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# The product from a reactor contains 60 w w A 25 ww B and 15 ww C The final saleable product is required to contain 90 A The mixture can be purified in a distillation column but under the

The product from a reactor contains 60% w/w A, 25% w/w B and 15% w/w C. The final saleable product is required to contain 90% A. The mixture can be purified in a distillation column but under the conditions possible in the column the product produced is 100% A with the bottom product containing no A. It is possible to mix the reactor products and distillation product. Calculate: (i) the amount of reactor product that could by-pass the distillation system to give the maximum amount of saleable product at minimum cost (ii) the amount and composition of 'waste' material. 3 Teesside University Open Learning (Engineering) © Teesside University 2011 4. 500 kg h–1 of a 10% w/w solution of a compound X(OH)2 is to be treated using a 5% excess of 20% w/w solution of sodium carbonate (Na2CO3) to precipitate the X as its carbonate according to the balanced reaction equation: All the solid is filtered off but some solution remains with the solid such that the solution forms 4% w/w of the total mass removed. The filtered liquid product is then neutralised with 2 molar hydrochloric acid according to the reactions: Calculate: (i) the amount (kg h–1) of sodium carbonate solution required (ii) the amount (kg h–1) and composition (% w/w) of the liquid product after filtration (iii) the amount (kg h–1) and composition (% w/w) of the solid product after filtration (iv) the amount of acid (in litres per hour) required for neutralisation. Data: Relative atomic mass of X = 40, O = 16, H = 1, Na = 23, C = 12, Cl = 35.5. Na CO HCl NaCl H O CO 2 3 aq aq aq ( ) ( ) ( ) () ( ) 2 l 2g + ? ++ 2 2 NaOH HCl NaCl H O ( ) ( ) ( ) () aq aq aq 2 l +? + X OH Na CO XCO NaOH aq 2 3 aq 3 s aq ( ) + ?+ 2( ) ( ) () ( ) 2 4 Teesside University Open Learning (Engineering) © Teesside University 2011 5. A chemical process is represented by the equation and diagram below: The feed to the process (F) contains 'A' and 'B' in stoichiometric proportions. It also contains 0.5 mol % of impurity 'I'. The mixture (X) entering the reactor (i.e. feed and recycle) contains 'A' and 'B' in stoichiometric proportion but the level of impurity must not exceed 4 mol%. In the reactor, the reaction goes to 60% completion. Pure product (C) is removed completely in the separator. The remainder of the reaction products (i.e. unconverted 'A' and 'B' together with any impurity) is recycled. In order not to exceed the maximum quantity of impurity in the reactor feed, some of the recycle is purged (P), the remainder (R) going back to the reactor. On the basis of 100 kmol of 'A' plus 'B' entering the reactor at (X), carry out mass balances to find the flows of: (i) feed (F) (ii) recycle (R) (iii) purge (P).

Jul 23 2020 View more View Less