Question

Problem Statement #3: Methane (CH) reacts with Cl; to produce methyl chloride (CH,CI) and HCI. However some of the CH,CI undergoes further chlorination to form CH Cl; and HCI. The balanced reactions are shown below: CH,+C CHCI+ HCI CH CI CICH CI,+ HCI A fresh feed consisting of 200 mol/h of methane with 150% excess Cl, is joined by a recycle stream and the mixture is fed to a reactor where it reacts to produce CHCI, CH CI and HCL The products from the reactor are sent to a separator where 80% of the unreacted CH, and Cl; are recycled, while the remaining CH., Cl, and the products are sent to another part of the plant to be processed. If the overall conversion is 90% and the selectivity is 3, find a. the molar flow rates of HCI. CH CI and CH,CI b. the single-pass conversion of CH,

Answer 1

Given neactions ane CH C, tHCL CHCLt C Let extent of neaction of aeaction O extent of neaction of neacEion@ Given exces s no-of moles in feed- no of moles heg ue ex cess na of moles heguined X (00 n0 0f moles mollA neguired 200 (50 moles infeed-20O x (e0 260 mollh moles in S00 Incrally 200 SOO Afcea 1 eaction compleced x 500-1 200-X S00-x S00-2-7 ズーン

Sepehalc d-2 (200-x) Cly 200-1 20 0mh C Reacloh o-2 G00-1d S00-2-1 Cl - CC CHCL x-FA CH,Cl C20 0-x) CH4 Gioen Ovenall convession- Reactant input- Reactant oup Reaclion nprt 90 200- o-2(200-x 2e6 lon 200 40 + 0 27 180 O- 22= 20 I 00moles destaed produce slectivicy moles of moles of undesiged produc 3-8 = RE t00- 100 MSSmoles 48

Flow gate of Hcl = 12smales flow nate af CHC - 75 moles Flow aate of c Cl, 25 moles Sing le - pass conveasons neactant Input to the Reacton-neactand output 9om 9eacto neactan input CO the neactor C200-2) Single-pass Con veRsion of Ce (e 200- 200 (00 2 = so%o