Phosphate conditioning, Chemistry

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.

Posted Date: 7/21/2012 7:08:00 AM | Location : United States







Related Discussions:- Phosphate conditioning, Assignment Help, Ask Question on Phosphate conditioning, Get Answer, Expert's Help, Phosphate conditioning Discussions

Write discussion on Phosphate conditioning
Your posts are moderated
Related Questions
what can you deduce about the relationship between ionization energy and reactivity of metals

Q. Uses of selenium? Uses of selenium include photocopying process of xerography, decobrisation of glasses and as a catalytic agent particularly in the isomerisation of certain

To calculate the e.m.f of the cell when does the nelsons equation is use? Ans) The Nernst equation is useful to measure the e.m.f of the cell when the concentrations of solution

Problem: Let us calculate Q value of the reaction 27 Al (d, α) 25 Mg Answer: Given that masses of 27 Al = 26.981541        2 H        = 2.014102 4 He = 4.

Write and balance the equation for the burning of an unknown hydrocarbon, C4H9 in air.

Generation of the electrophile : The electrophile is the carbocation produced by protonation of the alcohol  oxygen and loss of water.

mention the condition required of maximum the yield of ammonia.?

You make up 0.100 L of a buffer having 1.00 M acetic acid and 1.10 M sodium acetate. The Ka of acetic acid is 1.8 x 10-4. (a) Determine the pH of this buffer.

The correct electronic configuration of Ti(Z= 22)  atom is: (1) 1s 2 , 2s 2 , 2p 6 , 3p 6 , 4s 2 , 3d 2 ,   (2) 1s 2, 2s 2 , 2p 6 , 3p 6 , , 3d 4 ,         (3) 1s 2 , 2s

The electronic configuration of an element is  1s 2 , 2s 2 2p 6 3s 2 3p 6 3d 5 4s 1 . This represents its: (1) Excited state (2) Ground state        (3)Cationic for