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16 Nov 2019
PSpearmint oil can be produced by steady-state extraction with hexane. One such process is shown below, where a solids-free extract is produced and 15 percent of the oil in the feed mint is lost in the waste stream. [30 pts 1976. kg/h extract (solids-free) Xokg oil/kg 1-Xo kg hexane/kg mH kg/h hexane O,E Extractor 1250. kg/h dried mint 22.5 % oil 77.5 % solids mw kg/h waste (solids, lost oil and hexane) 75 % solids ow kg oil/kg Xhwkg hexane/kg a) List the unknowns in this process b) How many independent material balance can be Witten%. c) How many other equations can we use, if anyli d) How many degrees of freedom do we bave: e) Write the equations necessary to solve for all of the unknowns. The number of spaces does not necessarily represent the number of equations needed. Use the notation and values/units provided in the flow diagram. [5 pts] f) What is the hexane to oil mass ratio in the extract? Show your work. [15 pts]
PSpearmint oil can be produced by steady-state extraction with hexane. One such process is shown below, where a solids-free extract is produced and 15 percent of the oil in the feed mint is lost in the waste stream. [30 pts 1976. kg/h extract (solids-free) Xokg oil/kg 1-Xo kg hexane/kg mH kg/h hexane O,E Extractor 1250. kg/h dried mint 22.5 % oil 77.5 % solids mw kg/h waste (solids, lost oil and hexane) 75 % solids ow kg oil/kg Xhwkg hexane/kg a) List the unknowns in this process b) How many independent material balance can be Witten%. c) How many other equations can we use, if anyli d) How many degrees of freedom do we bave: e) Write the equations necessary to solve for all of the unknowns. The number of spaces does not necessarily represent the number of equations needed. Use the notation and values/units provided in the flow diagram. [5 pts] f) What is the hexane to oil mass ratio in the extract? Show your work. [15 pts]