Chemical enginering assignment Essay Example | Topics and Well Written Essays - 2500 words

Chemical enginering assignment - Essay Example The acetic acid which is the vapour is then cooled to obtain its distillate. From the cooler the acetic acid stream containing paracetamol and water (product) enters evaporator for concentration (increasing its concentration) by removal of certain portions of water from the product. Consider the flow diagram below; According to mass balance principle, mass of materials entering a system is equal to the mass of materials leaving the system assuming that there are neither losses within the system nor losses associated with the processes under which the materials entering the system undergo (Wacharawichanant 2012). This can be expressed mathematically as shown below, As of the case of processing paracetamol, the rate of mass of products (paracetamol) entering the evaporator is equal to rate of mass of mass of concentrate leaving the system plus rate of mass of vapour leaving the system. Mass balance can be expressed mathematically as shown below, (consider Figure 1) The mass of the products from cooler, (the mass of Acetic acid + Water + paracetamol) was 2319 Kg per hour (Kg/hr) (From L-37) of the Engineering line diagram (report 2). After evaporation the mass of the concentrate obtained per hour was 1380.85 Kg per hour. Therefore, the mass of the vapour (acetic acid vapur) assuming that no loss occurred as a result of evaporation process can be calculated as follows. In order that required quantity of paracetamol per year is obtained, and assuming other factors are constant, the product from the cooler should be fed at rate of 2319 Kilograms per hour or 55656 Kilograms per day (assuming that the plant will work 24 hours per day). A measure of concentration process that takes place in the evaporator is what is known as evaporation ratio, and it is calculated as shown above. When concentrating the solution F (dilute paracetamol) at a steady rate, the concentration rate starts