> normally rinsing is specified in terms of dilution factor.what is the
> dilution factor requried in rinses following baths that contain high
> dissoved solids?
> E.g after acid copper, acid/ alkaline etching, permanganate desmear
> etc.(assuming soft or D.I water is used)
>
> sometimes chemistry supplier specify the water turnover in a counter flow
> rinses should be 1to 2 bath volume per hour. what is the relationship
> between dilution factor and bath turnovers ? In their effort to increase
> bath lives,excess amount of water is used than necessary.
>
> how do you fix amount of rinse water required for a particular volume of
> dragout(for particular throughput)
>
> thanks in advance

Hi,

The magic number is 2.3.  It take 2.3 tank volumes to dilute to 10% of the
original concentration.  For example:  If you dragged in enough solution
into a 100 gallon tank to get a concentration of 100 ppm, you would have to
add 230 gallons of clean water to dilute to 10 ppm.  This is why we use
counterflow (cascade) and spray rinses. 

You may wish to review our web page at www.remco.com/an2.htm.  This has a
graph and formula for calculating this.  I also have a spreadsheet where you
can change the variables and calculate for a single and double/triple
counterflow rinses.
Specify quatro pro or excel,

You may also want to review www.remco.com/an1.htm and www.remco.com/an4.htm
which discuss other aspects of rinsing and rinsewater control.

Bob Mesick


Remco Engineering
Environmental Water and Wastewater Treatment Systems
Home: http://remco.com/home.htm

***************************************************************************
* TechNet mail list is provided as a service by IPC using SmartList v3.05 *
***************************************************************************
* To subscribe/unsubscribe send a message <to: [log in to unmask]>   *
* with <subject: subscribe/unsubscribe> and no text in the body.          *
***************************************************************************
* If you are having a problem with the IPC TechNet forum please contact   *
* Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask]      *
***************************************************************************