HOW CAN CHLORIDE EVAPORATE???
HOW CAN CHLORIDE EVAPORATE???
(OP)
our plant bottom section of distillation column was contaminated by chloride (Cl-). This chloride come from sea water leakage outside distillation system to the feed (liquid). The concentration accumulate at this bottom section reach 250 ppm.
As i know chloride is in form of ion and it can not be evaporate. But from our lab analysis, we found that the top product (our pure product) is also contaminated by it.
How can this chloride ion get into our top distillation product?? is it carried over by the vapour (entrainment) from the bottom section?? or can it form a volatile compound such as HCl and than evaporate??
Chloride fastly promoted corrosion like pitting corrosion, doesn't it?? So should we shutdown the plant and do cleaning program for the equipment??
As i know chloride is in form of ion and it can not be evaporate. But from our lab analysis, we found that the top product (our pure product) is also contaminated by it.
How can this chloride ion get into our top distillation product?? is it carried over by the vapour (entrainment) from the bottom section?? or can it form a volatile compound such as HCl and than evaporate??
Chloride fastly promoted corrosion like pitting corrosion, doesn't it?? So should we shutdown the plant and do cleaning program for the equipment??





RE: HOW CAN CHLORIDE EVAPORATE???
you are getting products of reaction (chlorination).
RE: HOW CAN CHLORIDE EVAPORATE???
RE: HOW CAN CHLORIDE EVAPORATE???
Besides, some chlorides (e.g., magnesium chloride) decompose at temperatures above 177oC to form volatile HCl in the presence of moisture.
Thus, chlorides may appear in distillation overheads.
RE: HOW CAN CHLORIDE EVAPORATE???
RE: HOW CAN CHLORIDE EVAPORATE???
nice response.
we have our discussion here and i guess the cl- was carried by the vapour (entrainment) instead forming other compound such as HCl.
So my guess is: HE leakage, sea water contain Cl- mixed with distillation feed, accumulate in bottom section.
Then the bottom liquid was evaporated in reboiler, the vapour caried away liquid droplet (as entrainment) which contain disolved Cl- to the top of column. So the distillate was contaminated by Cl-
since we can not observe this mechanism, i'm still not sure about this. I need more opinion.
Thanx
dev
RE: HOW CAN CHLORIDE EVAPORATE???
RE: HOW CAN CHLORIDE EVAPORATE???
bottom temperature 112 C
bottom pressure 1.7 barg
top temperature 84 C
feed contaminated by Cl- entered from middle of tower (tray 33 of 85)
as i mentioned Cl- source is sea water leakage so it also contain (in bottom) other constituent such as possessed by sea water.
thanx
dev
RE: HOW CAN CHLORIDE EVAPORATE???