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topic 6760

Chlor-Alkali Sulphuric Acid re-concentration


I am the Operations Manager for a CHlor-Alkali company. Our process requires the use of concentrated sulphuric acid (98%) for the drying of the chlorine gas prior to liquification. During this process the concentration drops to approximately 85% at which time the chlorinated acid cannot be used further.

I am looking for a way of re-concentrating the acid to approximately 90% and forming a closed system.

Andy Mahadeo
- Trinidad


Reconcentrating of dilute sulphuric acid to 98% is not considered worthwhile and hence not done in majority of plants.

Sudhakar Achwal
Kvaerner - Portsmouth, UK


Concentrating from 85% to 90% or above is possible but expensive. A simple way is to mix with Oleum and bring up the concentration. This would result in the increase of total acid quantity. Some acid could be disposed off as 98% acid. This wold be a simpler method than to concentrate the acid.

RJ Associates Engineers Pvt Ltd - Mumbai, Maharashtra, India


I did concentrated sulphuric acid but by a foolish way of my own which seemed to be working

I placed the dilute acid in a beaker and placed the beaker in another larger one which was filled with water at a constant level and heated

the outer water reaches 100C and also the inner acid
so water evaporates from the acid while the acid is with a boiling point of 180

pretty foolish way but it seemed to be working in an inverse logarithmic speed.

Flanker Scorpion
- Cairo, Egypt

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