# Calculate Heat Transfer To Crystallizer

Question

An aqueous solution of sodium acetate (20.0 mol% NaC2H3O2) flows at a rate of 100 kg/h into an evaporative crystallizer at 60°C. When the solution is exposed to the low pressure in the evaporator 16.9% of the water evaporates, concentrating the remaining solution and causing crystals of sodium acetate trihydrate (NaC2H3O2.3H2O) to form. The product is an equilibrium mixture of crystals and a saturated aqueous solution containing 15.4 mol% NaC2H3O2. The effluents (crystals, solution, and water vapor) are all at 50°C.

Estimate the rate at which heat must be transferred to or from the crystallizer (state which), using the following physical property data:

Cp, all solutions = 3.5 kJ/(kg °C)

Cp, crystals = 1.2 kJ/(kg °C)

Cp, H2O(v) = 32.4 kJ/(kmol °C)

ΔÄ¤v,H2O = 4.39 x 104 kJ/kmol

Heat of solution of anhydrous sodium acetate: ΔÄ¤s(25 °C) = -1.71 x 104 kJ/kmol NaC2H3O2

Heat of Hydration: NaC2H3O2(s) + 3 H2O (l) à NaC2H3O2.3H2O (s) ΔÄ¤(25 °C) = -3.66 x 104 kJ/kmol NaC2H3O2

Summary

The question belongs to Chemistry and it discusses about calculating the rate at which heat must be transferred to or from the crystallizer. This has been discussed in the solution detail.

Total Word Count 288

• Rasha

this is a very good website

• maani

I have 50 questions for the same test your page is showing only 28

• joeanne

• joeanne

hi can anyone help or guide me to my assignments. thanks

• Monik

• Cristina

This solution is perfect ...thanks

• Janete

Hello Allison,I love the 2nd image that you did! I also, had never heard of SumoPaint, is something that I will have to exolpre a bit! I understand completely the 52 (or so) youtube videos that you probably watched. Sometimes they have what you want, sometimes they don't! However, it is always satisfying when you are able to produce something that you have taught yourself. Great job!Debra 0 likes

• Sandeep

Perfect bank of solution.

• Oxana

great !

• Paul Brandon-Fritzius

thanks for the quick response. the solution looks good. :)

• tina Johnson

thnx for the answer. it was perfect. just the way i wanted it.

• Giuseppe

works fine.