Question

Hydrogen fluoride (HF), an essential substance in the semiconductor manufacturing process, is a material of high purity and can be produced by chemical reaction by applying heat to a mixture of fluorspar (CaF2) and sulfuric acid (H2SO4), (CaSO4) is produced as a by-product. do, Company A is attempting to synthesize hydrogen fluoride using a batch reactor to obtain hydrogen fluoride with a purity of 99%. When the reaction rate of fluorspar, a reactant, in the chemical reaction of hydrogen fluoride production (kg / hr) is rCaF2 = 100 -0.91, 99% purity of fluoride is obtained when 100 mol of fluorspar and the same number of sulfuric acid are added to the reactor. Calculate how many hours the reactor needs to run to get hydrogen.. 1 142 لا gE و6241 et 20 10 بچی 13 /1 4 و 2 a » ا e ه | SAMSUNG يالالالاله الهالة الله الى الهات" = االالات

Answer 1

The solution steps are shown below:

Solution, é cafe = - d[Ca] = dt 100 exp 1-o.at). 100 exp (- 0.9t). 997 purity is obtained when 100 ml. transpan [af ] reacts. of @t-o [Ca Fz] = 100. Then for 99% purity. @ t = to [Ca F₂] = 0 - d[Ca E] = 100 exp (-0.9t) d t Integrating with limits. - f d (ca Fi] = 100 loo exp(-0.9t) at

+ [Carli (0-100) = 0.9 t hoo supl-0.44). loof epf-0-2 t) -esploit -0.9= exp(-0.9to) - 1 exp(-ooq to) = 0.l. -o.a to = en lo.i). to = - In/0.1) 0.9. t = 2.56 hours