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Hno2 Vapor Separation From Spent Acid

packed column acid separation separation process

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#1 kamble.shridhar


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Posted 06 April 2017 - 06:04 AM

here is a typical industrial problem where HNO2 is to be separated from Spent acid (Sulphuric acid and Nitric Acid) the details of Spent Acid is as follows


Spent Acid:

Total 10MT of Spent Acid

99.7 % of H2SO4 

0.3 % HNO2

70 % solution,

density - 1500 kg/m3


0.3 % of HNO3 is to separated and brought down below 0.05 % , this has been experimented on pilot scale which is successful , with 500 Ltr of Spent acid was top fed in a Packed Column, of packing height 2M with SS Pall rings in it, and dia of packing was 0.3 m , and air was introduced from bottom at a rate of 500 LPM the separation took 25 hrs , now that can any one optimize or suggest any improvement in it and design it for 10 MT of spent Acid to separate in 8 to 10 hrs.  pls let me know.


Query: 1)Is Temp to be mentioned at 85 to 90 deg C for boiling of HNO2 

            2) the air which was introduced was at room temp , does pre-heating the separation be effective,

            3) MOC of Column and type of  Packing to be used, tower ht and Dia











Edited by kamble.shridhar, 13 April 2017 - 02:13 AM.

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