Technological Institute of the Philippines ENERGY BALANC Technological Institute of the Philippines Technological Institute of the Philippines Technological Institute of the Philippines ENERGY BALANCE AROUND PREHEATER 1 Inlet Temperature, Components Mass, kg K Molasses 31555.548 310.15 Inlet Temperature, Components Mass, kg K Molasses 31555.548 338.65 Determined from www.EngineeringToolBox.com πΎπ½ Cp of Molasses = 2.093 × 10−3 πΎπ−πΎ The Heat (Q) Around the Pre heater is: π2 Q = ∫π1 ππΆπππ 338.65 πΎ = ∫310.15 πΎ 31555.548 πΎπ × 2.093 × 10−3 = 1,882.30 KJ Determined from www.EngineeringToolBox.com Latent Heat of Vaporization of Water = 2256 πΎπ½ πΎπ The mass of water required in the Pre heater: Amount of water = = π πππ‘πππ‘ βπππ‘ ππ π£ππππππ§ππ‘πππ 1882.30 KJ πΎπ½ 2256 πΎπ = 0.83 Kg of Water πΎπ½ πΎπ−πΎ ππ Technological Institute of the Philippines ENERGY BALANCE AROUND PREHEATER 2 Inlet Temperature, Components Mass, kg K Nitric Acid 66266.65 293.15 Outlet Temperature, Components Mass, kg K Nitric Acid 66266.65 338.65 Determined from Table 2-166, Perry’s Handbook 8th Edition Cp of Nitric Acid = 2.6272 πΎπ½ πΎπ−πΎ The Heat (Q) Around the Pre heater is: π2 Q = ∫π1 ππΆπππ 338.65 πΎ = ∫293.15 πΎ 66,266.65 πΎπ × 2.6272 πΎπ½ πΎπ−πΎ = 7,921,356. 40 KJ Determined from www.EngineeringToolBox.com Latent Heat of Vaporization of Water = 2256 πΎπ½ πΎπ The mass of water required in the Pre heater: Amount of water = = π πππ‘πππ‘ βπππ‘ ππ π£ππππππ§ππ‘πππ 7,921,356.40 KJ πΎπ½ 2256 πΎπ = 3,511.24 Kg of Water ππ Technological Institute of the Philippines ENERGY BALANCE AROUND REACTOR 1 (CSTR) Mass, Inlet Components Kg Temperature Vanadium Pentoxide 63.77 338.65 Mass, Outlet Components Kg Temp Nitrogen Oxide 23666.4 338.65 Inlet Components Mass, Kg Temperature Nitric Acid 66266.65 338.65 Inlet Components Mass, Kg Temperature Molasses 31555.548 338.65 Components Unreacted Molasses Unreacted Nitric Acid Vanadium Pentoxide Water Oxalic Acid Mass, Kg 78888.86 16566.66 63.77 14199.84 35500 Reaction Involved: C6H12O6 + 6HNO3 ο 3C2H2O4 + 6NO + 6H2O Determined from www.EngineeringToolBox.com πΎπ½ Cp of Molasses = 2.093 × 10−3 πΎπ−πΎ πΎπ½ Cp of Water = 24.1879 πΎπ−πΎ πΎπ½ Cp of Nitric Oxide = 0.995 πΎπ−πΎ Outlet Temperature 338.65 Technological Institute of the Philippines Determined from https://webbook.nist.gov πΎπ½ Cp of Oxalic Acid = 1.6222 πΎπ−πΎ Determined from Table 2-166, Perry’s Handbook 8th Edition Cp of Nitric Acid = 2.6272 πΎπ½ πΎπ−πΎ βπ»ππ₯π = βπ»ππ₯π° + βπ»πππππ’ππ‘ − βπ»πππππ‘πππ‘ Total Heat of reactant πΎπ½ HMolasses = 31,555.548 Kg × 2.093 × 10−3 πΎπ−πΎ × 338.65πΎ = 22,366.40 KJ HNitric Acid = 66,266.65Kg × 2.6272 πΎπ½ × 338.65πΎ πΎπ−πΎ = 58,957,524.04 KJ Hreactant = 22,366.40 KJ + 58,957,524.04 KJ = 58,979,890.44 KJ Total Heat of Product πΎπ½ HUnreacted Molasses = 78,888.86Kg × 2.093 × 10−3 πΎπ−πΎ × 338.65πΎ = 55,915.99 KJ HUnreacted Nitric Acid = 16566.66Kg × 2.6272 πΎπ½ × 338.65πΎ πΎπ−πΎ = 14,739,381.01KJ Hwater = 14199.84 Kg × 4.1879 = 20,138,672.24 KJ πΎπ½ πΎπ−πΎ × 338.65πΎ Technological Institute of the Philippines πΎπ½ HOxalic Acid = 35500 Kg × 1.6222 πΎπ−πΎ × 338.65πΎ = 19,502,210.07 KJ HNO = 23,666.4 Kg × 0.995 πΎπ½ × 338.65πΎ πΎπ−πΎ = 7,974,553.23 KJ Hproduct = 55,915.99 KJ + 14,739,381.01 πΎπ½ + 20,138,672.24πΎπ½ + 19,502,210.07 πΎπ½ + 7,974,553.23 πΎπ½ =62,410,732.53KJ Q Heat = Hproduct – H reactant = 62,410,732.53KJ - 58,979,890.44 KJ = 3430842.093 KJ Technological Institute of the Philippines Technological Institute of the Philippines R-02 Technological Institute of the Philippines Technological Institute of the Philippines Technological Institute of the Philippines Technological Institute of the Philippines Technological Institute of the Philippines CRYSTA 1 AND 2 Technological Institute of the Philippines CENTRI 1&2 Technological Institute of the Philippines Technological Institute of the Philippines Technological Institute of the Philippines Technological Institute of the Philippines
