Material Balance

Chemical reaction:

1 mole = 1 mole = 1 mole = 1 mole

Molecular weight of Acetic Anhydride = 102.09 (EXCESS REACTANT) Molecular weight of Salicylic Acid = 138.12 (LIMITING REACTANT) Molecular weight of Acetyl Salicylic Acid = 180.16 (MAIN PRODUCT) Molecular weight of Acetic Acid = 60 (BY-PRDOUCT)

STOICHIOMETRY BALANCE FOR 100% YEILD: (Kg basis) Limiting component: 138.12 Salicylic Acid required = 180.16 Acetyl Salicylic Acid ? = 4000 kg Salicylic Acid required = 3067.5 kg. FOR 90% CONVERSION: Salicylic Acid required = 3067.5/0.9 = 3407.8 Kg.

EXCESS COMPONENT: FOR 100% YEILD: (Kg basis) 102.09 Acetic Anhydride required = 180.16 Acetyl Salicylic Acid ? = 4000 kg Acetic Anhydride required = 2266.6 Kg FOR 90% CONVERSION: Acetic Anhydride required = 2266.6/0.9 = 2518.5 Kg

SOLVENT REQURIED: SOLVENT: Acetic Anhydride = (1:1.13) Toluene Required = 2518.5/1.3 =1937.3 Kg. CATALYST REQURIED: 1.5% OF WEIGHT OF Salicylic Acid = .015* 3407.8 Sulphuric acid required = 51.117 Kg PRODUCT FORMED: Acetyl Salicylic Acid Formed = 4000 kg BY PRODUCT FORMED: Acetic Acid Formed = 1332.149 Kg.

STOICHIOMETRY BALANCE

RECYCLE REACTION: Ketene + Acetic Acid Acetic Anhydride 1 mole = 1 mole = 1 mole 42 kg ketene = 60 kg Acetic Acid ? = 1332.149 Ketene Required = 932.50 Kg. Acetic Anhydride Formed = 2266.65

EQUIPMENT WISE MATERIAL BALANCE

Input Output

MATERIAL BALANCE OVER REACTOR

MATERIALS ENTERING (Kg) LEAVING(Kg)

Acetic Anhydride 2518.5 251.9

Salicylic Acid 3407.8 340.3

Toluene 1937.8 1937.8

Acetyl Salicylic Acid 0 4000

Acetic Acid 0 1332.449

Sulphuric Acid 51.117 51.117

TOTAL 7915.217 7915.21

MATERIAL BALANCE OVER REACTOR

MATERIAL BALANCE OVER CRYSTALLIZER

MATERIAL BALANCE OVER CRYSTALLIZER

MATERIALS ENTERING (Kg) LEAVING(Kg)

Acetic Anhydride 251.9 251.9

Salicylic Acid 340.8 340.3

Toluene 1937.8 1937.8

Acetyl Salicylic Acid(Crys) 0 3500

Acetyl Salicylic Acid(liqu) 4000 500

Acetic Acid 1332.449 1332.449

Sulphuric Acid 51.117 51.117

TOTAL 7914.066 7913.566

MATERIAL BALANCE OVER FILTER

MATERIAL BALANCE OVER FILTER

MATERIALS ENTERING (Kg) LEAVING(Kg) TOP LEAVING(Kg) BOTTOM

Acetic Anhydride 251.9 251.9 0

Salicylic Acid 340.8 340.3 0

Toluene 2228.47 2028.47 20

Acetyl Salicylic Acid(Crys) 3500 0 3500

Acetyl Salicylic Acid(liqu) 500 500 0

Acetic Acid 1332.449 1332.449 0

Sulphuric Acid 51.117 51.117 0

TOTAL 8204.736 4504.236 3520

MATERIAL BALANCE OVER ABSORBER

MATERIALS ENTERING (Kg) LEAVING(Kg) TOP

Acetic Anhydride 251.9 2517

Salicylic Acid 340.8 340.3

Toluene 2228.47 2228.47

KEYENE GAS 932.5 0

Acetyl Salicylic Acid(liqu) 500 500

Acetic Acid 1332.449 0

Sulphuric Acid 51.117 51.117

TOTAL 5637.236 5636.887

MATERIAL BALANCE OVER ABSORBER

ENERGY BALANCE

ENERGY BALANCE

MATERIALS MASS MASS FRACTION Cp in J/Kg Cp*w in J/Kg

Toluene 1937.8 0.244 1.13 0.2766

Sulphuric Acid 51.117 0.006 1.14 0.0091

Acetic Anhydride 2518.5 0.32 1.17 0.372

Salicylic Acid 3407.8 0.43 1.81 0.778

TOTAL 7915.217 1 1.4357

ENERGY BALANCE OVER REACTOR

HEAT OF REACTION (Q) = -84J/g.mol dt of steam = 110-100 = 100c dt of mixture = 90-25 = 650c Cp of steam at 1100c =2.03 Cp of mixture =1.357 Q + Ms* Cps* dts = m*Cpm* dtm -84 + Ms * 2.30*10 = 7915.217 * (1.43)*65 Ms=362.4kg

ENERGY BALANCE OVER CRYSTALIZER

dt of WATER = 36-28 = 80c dt of mixture = 90-45 = 450c Cp of WATER =4.17 J/Kg Mw* Cpw* dtw = m*Cpm* dtm Mw*4.17*8 = 7915.217 * (1.43)*45 Mw=152.6807 Kg of cold water is required