10-Year Case 9
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9. A mixture of C9 aromatic hydrocarbons and toluene undergoes disproportionation in the presence of a catalyst to produce mixed xylene. There is a reactor that processes 18,400 kg per hour of a mixture of C9 aromatics and toluene, with a toluene content of 50 wt%. The toluene content in the reaction product is 10 wt%, while the xylene content in the mixture is 38 wt%. What value is the selectivity of this reactor for the conversion of toluene into mixed xylene closest to? (The molecular weight of toluene is 92, and that of xylene is 106.) (A) 0.95 (B) 0.8 (C) 0.76 (D) 0.825. The calculated value for this question is over 40%; the ratio of the coefficients for a mixture of toluene and xylene is given as 1:2, but the correct answer is 1:1. Please discuss this issue
This post was last edited by chen3316407 on 2016-7-11 at 16:35. Is the answer 0.825? That’s what I got; it’s just a matter of converting toluene into xylene – the same benzene ring is used in both cases. You can refer to this post: http://bbs.hcbbs.com/thread-1317370-1-1.html
This is a set of answers; it’s far-fetched.