Dry Tek questions.

[desultoryendeavor]

I saw in gordo Tek it says Sodium carbonate could be used in place of calcium hydroxide but when I search I can't find any other posts about using.

Doesn't that mean it doesn't work?

I saw with q21q21 Tek that vinegar is used to speed up the process. It's not used with HIELO and that doesn't take any longer.

How necessary is using an vinegar with the dry tek?

 

[desultoryendeavor]

I also wanted to ask if there was any advantage to water washing with a dry tek as calcium hydroxide isn't water soluble.

If there is an advantage to water washing that is the ratio water to naphtha? Should the volume of naphtha be reduced down first as a dry Tek use a larger volume than a wet tek?

 

[Icon]

Hi, yes you could use sodium carbonate. It reaches 11 pH so the DMT will be >99% freebased. I have no idea why it isn't the more common choice instead of lye for wet teks.

I'm not sure about vinegar, that's a good question. Is HIELO also a calcium hydroxide dry tek?

There's not a specific ratio for washing that I've seen. My understanding is not much water, maybe 1/5th or less.

My notes for sodium carbonate:
240g Na2CO3 to 800ml for saturated solution
ph 11.6 @ 45.5g/100ml aqueous solution.

SODIUM CARBONATE WASH
Add sodium carbonate solution to saturated NPS, mix
Separate water, discard
Wash with distilled water twice more

As far as whether it matters, probably not, q21 crystals are so clean already. If I were going to do it tho (and I would), I'd do it as part of a mini-a/b. Then you get a defat, a sodium carb wash, and solvent wash.

Shouldn't be necessary to reduce the naphtha volume, but wouldn't hurt either. Might as well save it for reuse.