Phosphate conditioning, Chemistry

Assignment Help:

Q. Write phosphate conditioning method for water softening with suitable chemical reactions. How it is different from soda lime method.

Ans. 

Phosphate conditioning: In high pressure boilers, scale formation can be avoided by adding sodium phosphate, which reacts with hardness causing substance of water, forming non adherent and easily removable soft sludge of calcium and magnesium phosphates, which can be removed by blow down operation.

 

3MCl2 + 2Na3PO4 = M3 (PO4)2 + 6NaCl

 

Where   M = Ca+2 or Mg+2

Mainly employed phosphates are:

1.      Sodium dehydrogenate phosphate (acidic) Na2HPO4

2.      Disodium hydrogen phosphate (weakly acidic)  Na2HPO4

3.      Trisodium hydrogen phosphate (alkaline) Na3PO4.

Difference between phosphate conditioning and Lime-Soda method

 

Phosphate conditioning

Lime-soda process

1

This is internal treatment method.

This is external treatment method.

2

It just supplements the L-S process and is not meant to replace L-S.

It has its own importance and is meant that it is necessary.

3

In this appropriate sodium phosphates are added.

Calculated amount of L and S is added.


Related Discussions:- Phosphate conditioning

Direct isotope dilution analysis (DIDA), A solution contains an unknown amo...

A solution contains an unknown amount of osmium at the µg/g level, or below. Chemically pure osmium (Os) may be separated from the solution, but the chemical yields are variable an

Vsper theory, #quest defination ,description prostulates

#quest defination ,description prostulates

Chemical bond, what is chemical bond and his type?

what is chemical bond and his type?

Hydrides.., How to write conclusion for this topic hydrides

How to write conclusion for this topic hydrides

Structure of 1-1-dimethylcyclohexane, 1,1-Dimethylcyclohexane is achiral, a...

1,1-Dimethylcyclohexane is achiral, and therefore cannot be optically active.

Castenar kelner process, in castner kelnar process sodium metal extract at ...

in castner kelnar process sodium metal extract at cathode and calcium also why they do not mix if they extract at same chamber?

Effect of heat on metal carbonates, what are some issues that can be discus...

what are some issues that can be discussed in the project?

Define the term - extrusion, Define the term - Extrusion It is a meta...

Define the term - Extrusion It is a metal working process that produces long lengths of uniform cross sectional area from a metal billet by causing the latter to flow under h

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd