Questions 2-6 refer to the statement and information given b…
Questions 2-6 refer to the statement and information given below. In the manufacture of paper, logs are cut into smaller wood chips that are digested with an alkaline solution to make wood pulp. In one steady state process, logs are composed of 35 wt% water, lignin, insoluble inorganic impurities, and cellulose. The cellulose content of the logs is 42 wt% on a dry basis. They are cut into wood chips and are continuously fed to a digester unit. A fresh feed of aqueous NaOH solution is mixed with a recycle stream and fed to the digester as a second input. This combined alkaline liquid solution (stream 3) contains 30 wt% lignin. While none of the cellulose and the insoluble inorganics from the wood chips dissolve in the alkaline liquid, all of the lignin from the chips is solubilized into the alkaline solution. The single output from the digester is a solid-liquid slurry that is sent to a filter unit along with a stream (5) of pure water as a fresh feed. The primary product stream 6 is removed at a rate of 100 ton/day of wet wood pulp containing 60 wt% cellulose, some insoluble species, and a small amount of water. No NaOH or lignin leave in the wet wood pulp. The liquid filtrate (stream 7) is split into a recycle and a purge, which is removed from the process as a waste stream 9. For every pound of wood chips fed to the digester, two pounds of alkaline solution is fed to the digester. The amount of pure water required for the wash stream 5 is 5% of the total mass of slurry (4) fed to the filter. On your pdf submission in Test1_part2, draw a clearly labeled schematic that shows the above information. Without solving any material balances, determine the degrees of freedom for the filter unit. In the pdf upload in Test1_part2 you must briefly explain your answer by indicating the source of unknowns and source of independent equations. The explanation must be consistent with your labeled schematic for credit.