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

How are p-type and n-type semiconductor obtained, How are p-type and n-type...

How are p-type and n-type semiconductor obtained? A P-type semiconductor is attained by carrying out a process of doping which is adding a certain type of atoms to the semicon

Existence of positively charged nucleus was established by, Existence of po...

Existence of positively charged nucleus was established by: (1) Positive ray analysis   (2) α -ray scattering experiments    () X-ray analysis (4) Discharge tube exper

Difference between natural rubber and vulcanized rubber, Difference between...

Difference between Natural rubber and Vulcanized Rubber Natural rubber Vulcanized rubber  (1) it is soft and sticky Vulcanized

Solvent effect of UV, what is the solvent effect on transition metal?

what is the solvent effect on transition metal?

Illustrate relative amount of two co-existing phases, Illustrate and demons...

Illustrate and demonstrate that, for correct mass balance, relative amount of two co-existing phases or micro constituents should be as given by lever rule. The lever rule giv

Conformation energy profile for butane c2-c3 bond rotation, Conformation en...

Conformation energy profile for butane Conformation energy profile for butane C2-C3 bond rotation

Electrochemistry, reversible and irreversible cell with example

reversible and irreversible cell with example

Biological or a physical-chemical treatment, A) Explain the purposes of equ...

A) Explain the purposes of equalization basins, grit chambers, primary sedimentation tanks, and waste stabilization ponds in wastewater treatment. B) Would you consider a biolog

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