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

Physical properties of cycloalkane, Physical properties of Cycloalkane ...

Physical properties of Cycloalkane  (i) In Cycloalkane First two members are gases, next three members are liquids and higher ones are solids. (ii) Cycloalkane is not solubl

Spdf, how to solve the spdf i don''t understand

how to solve the spdf i don''t understand

Addition and Substitution of bromine to Toluene, Bromination of Toluene in ...

Bromination of Toluene in presence of light or heat gives benzyl chloride, but chlorination of benzene in presence of light gives benzene hexachloride. Why?

Aromatic nitro compounds - electrophilic substitution, Chemical Properties ...

Chemical Properties of Aromatic Nitro Compounds - Electrophilic substitution Because - NO 2 group is deactivating and m-directing, electrophilic substitution (halogenation, ni

Why can butyllithium not be used for deprotonation, Why can butyllithium (B...

Why can butyllithium (BuLi) not be used for deprotonation? The direct alkylation of enolates is often not very efficient for a preparative synthesis due to problems with furthe

Chemical properties of maleic acid and fumaric acid, Chemical Properties of...

Chemical Properties of Maleic Acid and Fumaric Acid Chemically, both of the acids provide the reactions of alkenes and dibasic acids apart from that the maleic acid on heating

SALT ANALYSIS, WHAT IS THE CHEMICAL EQUATION FOR LITHIUM SOLUTION WHEN AMMO...

WHAT IS THE CHEMICAL EQUATION FOR LITHIUM SOLUTION WHEN AMMONIUM FLUORIDE AND AMMONIA ARE ADDED

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