Question

A spent 1.0 percent caustic soda solution (PNaOH = 8.42 lb/gal) with a volumetric flow rate of 3.0 gpm is to be neutralized using either sulfuric acid or hydrochloric acid. First, determine the mass flow rate (lb/day) of NaOH in the spent caustic soda solution, and then use that value to determine the stoichiometric amounts (lb/day) of: 1. H2SO4 required for neutralizing the OH ions contributed by the spent caustic soda. [Hints: (1) write the balanced chemical equation for the acid-base reaction between NaOH and H2SO4, and use it to establish the stoichiometric weight ratio H2SO4: NaOH.] 2. HCl required for neutralizing the OH ions contributed by the spent caustic soda. [Hints: (1) write the balanced chemical equation for the acid-base reaction between NaOH and HCl and use it to establish the stoichiometric weight ratio HCI : NaOH.]

Answer 1

moss flow rate of waos/2016 Solution day 8-4216 gal- x 3.0 ga x Gomin x 24 hr hr day. mis Ib 3.6.000 geen Mb z 3 6, 374-y le a day. mass flow rate of Nach In bal Too h soy tinaOH mole 2 moles 98-07922 39-9979 mo (wib day 36,3444.16 s stryday : 363.74406 naso + 240. Storchometric worght z vatio of Hsu: waon. 98-0799 uso 2x39-9979 Naoy 2 1.226 mass how rate of use, required (in ) Stolchamehe weight rato x mass flow rove of noos 3 1.226 Hax 36, 37441 eb naon naod day Tuu, 500 9516 1 ~ 150oo Na 2 day 2 uso ebiday HCl + naon wall the Imae mole 36-460949 39-9979. stolchom eme ratio of Hel & Noon z 36-46090g = 0.9159. 39.9989 mass How rate of Ac required (2016) 2 0.9154 x 36,3741b/day 133, 1585 4 6 ~ 133,0 Day)