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2

# How To Determine Flash Evaporation Rate

flash

2 replies to this topic
|

### #1 rikakose

rikakose

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Posted 11 October 2018 - 02:34 AM

Block diagram is attached.

After reaction, the temperature in the reactor is 50ºC, Methanol and product (crystals) are present in the reactor.

Now, we start vacuum pump to flash the methanol. Methanol vapor is condensed and collected in the accumulator.

Vacuum pump working point is 100 mbar 48m3/h. it draws system pressure from 1 atm to 100 mbar in 30 min.

total methanol is 4m3.

Cooling water inlet temperature 1ºC.

How to calculate the vapor flow rate generated?

#### Attached Files

Edited by rikakose, 11 October 2018 - 02:36 AM.

### #2 breizh

breizh

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Posted 11 October 2018 - 07:21 AM

Hi ,

if your condenser is operating like a total condenser , the mass flow of liquid is equal to the mass  flow of gas .

my 2 cents

Breizh

### #3 rikakose

rikakose

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Posted 11 October 2018 - 09:05 AM

Hi ,

if your condenser is operating like a total condenser , the mass flow of liquid is equal to the mass  flow of gas .

my 2 cents

Breizh

Thanks for the reply.

The condenser should be able to condense all the vapor at 100mbara. condesation temperature around 10C. But we found the condensate in the accumulator is around 40ºC.

Cooling water return temperature is around 4ºC. indicating, condensation almost stops when pressure drops to certain value. we don't have any flowmeter.