A single-effect evaporator is concentrating a feed of 9072 g/h of a 10 wt% solution of...

A single-effect evaporator is concentrating a feed of 9072 g/h of a 10 wt% solution of NaOH in water to a product of 50% solids. The pressure of the saturated steam used is 42 kPa (gage) and the pressure in the vapor space of the evaporator is 20 kPa (abs). The overall heat-transfer coefficient is 1988 W/m2*K. a) calculate the steam use, steam economy and area if the feed temperature at 288.8 k (15.6 c) b) predict the new product composition if the feed rate is reduced to 4536 kg/h

Solutions

Expert Solution

NOTE: 1. DEAR STUDENT IF YOU WANT SOLUTION WITH ENTHAPY DATA FROM STEAM TABLE, KINDLY INFORM ME & I SHALL REUPLOAD THE SOLUTION. HOWEVER, RESULT WILL NOT VARY BY MUCH.

DEAR STUDENT FOR PARTA, FEED FLOW RATE IS MENTIONED AS 9072G/HR.& SOLUTION IS PROVIDED FOR PART A CONSIDERING THE SAME. IF UNIT IS KG/HR, THEN KINDLY INFORM ME & I SHALL MAKE MINOR ADJUSTMENTS REQUIRED IN SOLUTION. IN THAT CASE, AREA & STEAM CONSUMPTION ANSWER SHALL DIFFER.

IN PART B, REDUCED FLOW RATE IS HIGHER THAN ORIGINAL FLOW RATE HENCE SAME HAS BEEN CONSIDERED IN GRAM /HR.

IN CASE OF ANY DOUBT, FEEL FREE TO ASK & I SHALL TRY MY BEST TO RESOLVE YOUR QUERY. THANK YOU.

Amanda K answered 1 year ago

Next > < Previous

Related Solutions

A continuous single effect evaporator concentrates 9072 kg/h of 10 wt% salt solution to a product...

A continuous single effect evaporator concentrates 9072 kg/h of 10 wt% salt solution to a product of 50 wt% solid. The pressure of the saturated steam used is 42 kPa (gage) and the pressure in the vapor space of the evaporator is 20 kPa (abs). The overall heat transfer coefficient is 1988 W/m^2K a) calculate the steam used, steam economy and area if the feed temperature at 288.8k (15.6 c) b) predict the new product composition if the feedrate is...

a single effect evaporator is used to concentrate a solution of 10% of total solids to...

a single effect evaporator is used to concentrate a solution of 10% of total solids to 30% of total solids at a rate of 250 kg / h. if the evaporator pressure is 77 kpa, and if steam is available at 200 kpa gauge, the amount of steam needed per hour and the area of heat transfer area if the overall heat transfer coefficient is 1700 jm -22s-1 ° C. the feed temperature is 18 ° C and the boiling...

Fresh feed containing 55 wt% A and 45 wt% B flowing at 100kg/h enters a separation...

Fresh feed containing 55 wt% A and 45 wt% B flowing at 100kg/h enters a separation system that removes a portion of pure component A only, as a bottom product. The top product stream (tops) of the separator unit contains 10 wt% of componenet A and the balance is B. A small part of the tops stream is recycled and mixed with the fresh feed stream- the remainder of the tops stream is purged. The separtor is designed to removed...

A forward feed triple effect evaporator, where each effect has 150 m2 of heating surface is...

A forward feed triple effect evaporator, where each effect has 150 m2 of heating surface is used to concentrate a solution containing 5% solids to a final concentration of 35% solids. Steam is available at 97 kPa (gauge), and the boiling point at the last effect is 40 °C, The overall heat transfer coefficients, U in W/m2 °C are 2900 in effect 1, 2600 in effect 2 and 1300 in effect 3. The feed enters the evaporator at 90 °C....

A triple-effect evaporator is a process that removes pure water from a salt water feed. The...

A triple-effect evaporator is a process that removes pure water from a salt water feed. The process consists of three units connected in series. The feed to the process contains 3.43 wt % NaCl in water. In the first effect, sufficient water is evaporated to concentrate the solution to 3.89 wt % NaCl. The second effect concentrates the solution further to 4.22 wt %, and the brine discharged from the process contains 5.02 wt % NaCl. a. Draw a diagram...

A triple-effect forward-feed evaporator is used to concentrate a liquid which has marginal elevation in boiling...

A triple-effect forward-feed evaporator is used to concentrate a liquid which has marginal elevation in boiling point. The temperature of the stream to the first effect is 125°C, and the boiling point of the solution within third effect is 45°C. Find out at what temperatures the fluid boils in the Ι and ΙΙ effects. The overall heat transfer coefficients are 2250W/m2 in the Ι-effect, 1800W/m2 in the ΙΙ-effect and 1300W/m2 in the ΙΙΙ-effect respectively.

Making mixture solution: Cupric nitrate : wt = 241.60 g/mol SMS : wt= 250.278 g/mol I...

Making mixture solution: Cupric nitrate : wt = 241.60 g/mol SMS : wt= 250.278 g/mol I want to make the mixture of solution that has cupric nitrate constant concentration at 10E-5 M, but SMS concentration will run from 0 to 10E-4M So please help me make like 6 mixture solutions that have same concentration of cupric nitrate and SMS concentration run in that range. Thank you. Please show step by step

A solution is made by dissolving 0.0607 g of biphenyl (C 12 H 10 ) in...

A solution is made by dissolving 0.0607 g of biphenyl (C 12 H 10 ) in 350.0 mL of benzene (C 6 H 6 ) . If the vapor pressure of pure benzene is 24.4 kPa at 40.0 °C, then what will the vapor pressure of the solution be? (consider biphenyl to be nonvolatile)

An evaporator is used to concentrate 4536 kg/h of a 20% NaOH solution entering at 60?C...

An evaporator is used to concentrate 4536 kg/h of a 20% NaOH solution entering at 60?C to a product of 50% solids. The pressure of the saturated steam used is 170 kPa and the vapour space pressure of the evaporator is at 12 kPa. The overall coefficient U is 1560 W/m2K. Calculate the steam used, the steam economy (kg vaporized / kg steam used) and the heating surface area.

A single-effect evaporator generates a distillate product at a flow rate of 2 kg/s. The system...

A single-effect evaporator generates a distillate product at a flow rate of 2 kg/s. The system operating temperatures are as follows: • The boiling temperature, Tb is 90 ºC. • The feed temperature, Tf, is 85 ºC. • The steam temperature, Ts, is 100 ºC. • Boiling Point Elevation is neglected. • The Temperature of cooling Water, Tcw, is 25 ºC. Determine the heat transfer areas in the evaporator and the condenser, the thermal performance ratio, the flow rates of...

Subjects