# Introduction to process engineering and design by Thakore By Thakore

Creation to method engineering and layout

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This is known as heat of solution. Also when two liquids are mixed, a heat change takes place which is termed as heat of mixing. 15 K) and at standard atmospheric pressure. Units of the heat changes are kJ/mol solute, kJ/kg solution, etc. depending on user's convenience. When solids like causitc soda, caustic potash, sodium carbonate, etc. are dissolved in water, heat is evolved. Similarly when acids are mixed (a mixture of Introduction to Process Engineering and Design HNO3 + H2SO4 + H2O), heat is released.

1 kg/h Assume average condensation temperature of 450C. 9 kJ/kg (Ref. 69 kg/h (100%) Stoichiometry a .... 84 m3/h Since demineralized water is added at 250C, its heat input is zero. ^13 = ^ When HNO3 dissolves in water, heat change takes place (Ref. 1). 15 K (Ref. 88 kW Cooling water is supplied to internal coils at 320C and leaves it at 370C. 5 in Chapter 9. Both these examples refer to absorption with heat of absorption. 1 A cylinder is filled with 6 Nm3 hydrogen. Its pressure and temperature are 150 bar g and 350C.

VOC laden nitrogen is recycled. Other reasons for recycle are utilization of heat from the outgoing stream, to improve the performance of an equipment, to improve selectivity of a product, to improve safety of the process, to minimize waste generation, etc. Chemical engineers are familiar with reflux in a distillation column. It is basically a recycle stream to maintain specific quality of the top product. In Chapter 8, number of examples are given for calculating reflux ratio which represent material balance in an unit operation.