I hope I can give you an explaination in english,
because I am from Holland :
You start with the amount of NaOH you used
to make your batch of BD.
For example 5 kg for 800 liters of
BD.
So you use 5 kg NaOH, which you will all find
back in the bottom layer residue.
1 mole of NaOH weighs 23 + 16 + 1 makes 40
grams.
23 + 16 + 1 are the mole weights of the elements.
You can find them in te periodic system of elements in every schoolbook of
chemistry.
Now you mix with phosphoric acid, but what
percentage ?
Phosphoric acid is H3PO4, which has a mole weight
of (3x1) + 31 + (4x16) =98 grams
What you should try to reach is a complete
reaction between the acid and the NaOH
The reaction would be : H3PO4 +NaOH --> Na3PO4
+ H20
Now make it equal, so it gets to :
H3PO4 + 3NaOH --> Na3PO4 + 3H2O
In grams :
((3x1)+16+64) + (3x40)
--> ((3x23)+16+64) + (3x18) ---------> 203 =
203
So the reaction is equal now.
That means you need one mole of H3PO4 + 3 moles
of NaOH to react completely and split your residue.
As you will understand now, I hope, you need 98
grams of H3PO4 for every 40 grams of NaOH you used.
Of course if you have a phosphoric acid of let's
say 75%, it means that if you take 1 kilo of that, you have 750 grams of
phosphoric acid.
All together, if you don't take enough acid, you
won't split your residue completely, but if you take too much acid, you will
find the surplus somewhere in the FFA's , or maybe on the bottom, or
maybe solved in either of them, or maybe.........
I hope I helped you with this.
Greetings,
Pieter
----- Original Message -----
Sent: Thursday, December 01, 2005 3:13
PM
Subject: [Biofuel] seperating
Glycerine
Hi,
I did couple of tests on glycerin separation with the
titration method
on JTF with different results.
Test One;
250ml
byproduct
10ml phosphoric
shacked vigorously
There was
separation with 3 layers about 60/30/10 within about 15 minutes.
FFa
Glycerin and fluffy white sodium phosphate
Test two;
250ml
byproduct
10ml phosphoric
shaked vigorously
I then added 5ml
phosphoric
shaked vigorously
I added more phosphoric to
see what would happen.
there was separation with In about one minute
with two layers about 50/50
with creamy brown stuff on the bottom. FFa on
top
I then added more phosphoric until I got separation of a reddish
colour onbottom. this has being sitting for 4 hours or so.
In the jar
there is about (40/60 (ffa/glycerin)
with a very fine white layer on the bottom.
I made a mistake with the last mail.
There is a greater amount
of glycerin in test two and less ffa
Could any one explain to me what
is happening
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