[downpants]

Electrolytic coagulation? What happens in term of solvating, ionization, disociation when soluting CaCl2 or Ca(NO3)2 in methanol or ethanol? Edit

Hello experts

I tried to do an experiment in corelation to this article. (Precipitation of kraft black liquors (1996).

I prepared 6 samples at lab. temp 298,15K (mixing time was same for all samples 20minutes) :

1+2 = disolved 5 grams of CaCl2 in 50 ml of MeOH on magnetic stirrer. And did the same for 50ml of EtOH.

3+4= disolved 5 grams of Ca(NO3)2.4H2O in 50ml MeOH and EtOH

5+6= disolved 5 grams of these salts in 50ml of destiled water.

Then I measured conductivity - it was lower in all cases with alcohol as a solvent than in salt-water mixes. Can anyone please tell me why? (what forms in alcohol salt mix?)

Then I mixed these 6 samples with 6 same flasks (50ml) of "liquid residue" containing 40% of lignocellulosic material and stirred gently for 10 seconds.

In case of alcohol-salts adds the precipitation in "sludge" occurs fastly, visualy kinda better were CaCl2 mixes. Nothing happend during adding and mixing of water-salts mixes. This "precipitation" happenes in various different "coloidal systems" e.g. milk and absolutely don´t know the mechanism of it. how this Ca-alcohol coagulant work?   Can anyone help?

I searched for some information about this in terms of used organic solvents and I think the parameters such as

dielectric constant and surface tension of solvent (in the meaning of "wetting" and ion transport) could play a role in these "reaction"?

I´m not a chemist and definitely not a physical and electrochemist

I just would like to know what is the mechanism of this solid-liquid sludge separation in meaning of prepared alcohol-salt system?

I´ve also tried it with another soluble Cl, NO3 salts and majority "coagulation/precipitation" effect has a Ca2+ ions, trivalent cations (Fe3+, Al3+) also caused precipitation, but no effect like Shulz-Hardy rule was observed.

Can anyone please help me to understand what happen during disolving salts in alcohols?
And in context of solvation, dissociation?

Thanks for any idea