Questions regarding the calculations for the dry absorption process using sulfuric acid; looking forward to experts’ answers
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In the “Calculation and Selection of Sulfuric Acid Process Equipment” section of the Fertilizer Department, the heat balance calculations for the dry absorption towers involve the use of: 1. For the absorption tower using 98% acid, the heat of reaction of SO3 together with the integrated heat of dissolution is used to determine the concentration heat； 2. 104.5% of the nicotinic acid towers use differential heat of solution. May I ask, if differential heat is used, then reaction heat and integral heat should not be used; and if integral heat is used, then differential heat should not be used. For calculus, only one of the two types of heat can be used. Why?
Calculating the thermal equilibrium for this part is indeed quite difficult\ud83d\ude07
I guess: the final product of one absorption tower is a sulfuric acid solution; therefore, heat considerations involve two main aspects: 1. The reaction heat generated when SO3 reacts with water to form 100% sulfuric acid. 2. The heat of dilution as the 100% sulfuric acid produced is diluted with water to the acid concentration at the exit of the tower, and the heat of concentration as the acid at the entrance of the tower is concentrated to the acid concentration at the exit of the tower. As for the nicotinic acid tower, it can be assumed that there are no chemical reactions, only the heat of dissolution of SO3.