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Evaporation Of Hcl

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#1 Kpankhaniya


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Posted 13 September 2016 - 12:46 AM

Hi everyone,

Please help me with your suggestion for below condition

In a reactor, 15 ton of chloro sulphonic acid is added to a reactor below 30 deg C. After that 5 ton of acetanilde is added to the same reactor.

Thereafter, stirring is done for 4 hours at 45 deg C, in this process HCL is formed which is to be removed totally from the reaction.

The temperature maintained in this reactor is 45 deg C maximum, so to scrubb the hcl gas i have to evaporate hcl gas and for that i cannot heat the reactor by more than 45 deg c . So i have to give vaccume pressure to the reactor to bring down the boiling point of hcl to 45 deg C.

So please suggest, how much vaccume pressure should i consider to evaporate hcl at 45 deg C

Thank you in advance

#2 Rajneesh1234


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Posted 10 March 2017 - 02:46 AM

As per my understanding you have to calculate the partial pressure of HCL in mixture in the mixture, Bring the mixture pressure below what ever you have calculated,

#3 Dazzler


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Posted 10 March 2017 - 10:18 PM

Many reactor plants use some vacuum to keep the boiling point temperature of the reaction mixture low for quality reasons, and to slow the reaction down to a safer rate.


The boiling temperature in the reaction mass may change was the reaction proceeds and will depend on what compounds are evaporating at the time, as well as the pressure/vacuum.


If the reactor is not operated with any pressure then some vacuum is required as a driving force to pull the vapours through the downstream piping and scrubbing system etc which will all have a pressure drop to overcome.  So the vacuum pressure you will need to specify in the reactor, and this value is less vacuum than is needed at the source of the vacuum (such as the suction of a vacuum pump or other method).


I can't comment on real temperatures as these depend on your composition (changing).  HCL is however a gas and is usually present in industry in a solution which has a boiling point dependent on concentration.  Of course that will differ if other compounds are present also.  It could be that you are evaporating water (from the raw materials if they are solutions) and HCL at the same time?



Edited by Dazzler, 10 March 2017 - 10:19 PM.

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