Guaifenesin (Guaiacol glyceryl ether, 3-(2-Methoxyphenoxy)-1,2-propanediol, C₁₀H₁₄O₄) is an expectorant that is found in cough medicines such as Actifed^TM and Robitussin^TM. U.S. 4,390,732 (to Degussa) describes a preparation of the active pharmaceutical ingredient (API) from guaiacol (2-methoxyphenol, C₇H₈O₂) and glycidol (3-hydroxy propylene oxide, C₃H₆O₂). When the reaction is catalyzed by NaOH, the reaction yield is 93.8%. The product is purified in a thin-film evaporator giving an overall plant yield of 87%.

i. Estimate the feed flow rates of glycidine and guaiacol that would be needed to produce 100 kg/day of the API. 

ii. Estimate how much product is lost in the thin-film evaporator. 

iii. How would you recover the product lost in the evaporator?