Question

A liquid adhesive, which is used to make laminated boards, consists of a polymer dissolved in a solvent. The amount of polymer in the solution has to be carefully controlled for this application. When the supplier of the adhesive receives an order for 3000 kg of an adhesive solution containing 13 wt% polymer, all it has on hand is (1) 500 kg of a 10 wt. % solution, (2) a very large quantity of a 20 wt. % solution, and (3) pure solvent. a. Draw the flowchart for this process and label all process streams and units. b. Perform degrees of freedom analysis. c. Determine the weight of each of the three stocks that must be blended together to fill the order. Use all of the 10 wt. % solution.

Answer 1

Solution ma goulty polymer ORDER m, = 500kg lowth paymen + Myz 3000kg 13 wt% polymer m3 Pure sovent owth polymer be UMUMOWY Degree freedom analysis Number 2 {mar med Number La malardal of independent equation balanias Degree of freedom نك overall mass balance m, & m & my 3000kg 2 3 ovo Soo ug & m & mg m₂ & My Suo ky © Mass balance on polymers + 0.2m, tolm, ) 0:16 Stoug) + 0.2m 0.1m 0:13. Buvo key? to 390 o kg Blut key 1700 from an, we get & m, a 1700 BMI kg + m₂ 2500kg (mg 800