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.

Solutions

Expert Solution

Amanda K answered 1 year ago

Next > < Previous

Related Solutions

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...

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 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.

Determine the heating area required for the production of 4535.9 kg/h of 50% NaOH solution from...

Determine the heating area required for the production of 4535.9 kg/h of 50% NaOH solution from a 10% NaOH feed entering at 37.8oC. Evaporation is to be carried out in a single-body standard evaporator for which an overall coefficient of 2839 W/m2.K is expected. Steam is available saturated at 446.09 kPa and the evaporator can be operated at 32.4kPa. (A = 137.07 m2)

Water at a flow rate of 20,000 kg/h will be heated from 20°C to 35°C by...

Water at a flow rate of 20,000 kg/h will be heated from 20°C to 35°C by hot water at 140°C. A 15°C hot water temperature drop is allowed. A number of 3.5 m hairpins of 3 in. (ID = 0.0779 m) by 2 in. (ID = 0.0525 m, OD = 0.0603 m) counter flow double-pipe heat exchangers with annuli and pipes, each connected in series, will be used. Hot water flows through the inner tube. Fouling factors are: Rf i...

If a solution of NaOH has a 20% mass percent of NaOH and a density of...

If a solution of NaOH has a 20% mass percent of NaOH and a density of 1.22 g/ml, what is the molarity of this solution ?

4500 Kg/h of a solution that is one-third K2CrO4 by mass is joined by a recycle stream containing 36.4% K2CrO4, and the combined stream is fed into an evaporator.

(chemical engineering) 4500 Kg/h of a solution that is one-third K2CrO4 by mass is joined by a recycle stream containing 36.4% K2CrO4, and the combined stream is fed into an evaporator. The concentrated stream leaving the evaporator contains 49.4% K2CrO4; this stream is fed into a crystallizer in which it is cooled and then filtered. The filter cake consists of K2CrO4 crystals and a solution that contains 36.4% K2CrO4 by mass; the crystals account for 95% of the total mass of...

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...

A mixer used to prepare 1000 kg of 8 wt% sodium hydroxide (NaOH) solution. The feeds...

A mixer used to prepare 1000 kg of 8 wt% sodium hydroxide (NaOH) solution. The feeds to the mixer are 10 mol% sodium hydroxide solution in water and pure water. What are the quantities (in kg) of pure water and 10 mol% sodium hydroxide solution to be added to the tank?

A 10.0m solution of NaOH has a density of 1.33 g/cm3 at 20 °C. Calculate the...

A 10.0m solution of NaOH has a density of 1.33 g/cm3 at 20 °C. Calculate the mole fraction, weight percent (%), and molarity (M) of NaOH? Mole fraction = Weight percent = % Molarity = M

Subjects