What I previously did was to synthesize sodium stearate from stearic acid by addition of NaOH.
I first melted stearic acid in water at 60C, then mixed NaOH dissolved in water.
When white lumps started to form and float and/or suspend on water, I boiled off water.
However, I did not completely boil it off but let it dry on dessicator and vacuum oven.
But when I dissolve it on water, the product formed seems to not dissolve in water.
Any suggestions/comments?
You have to consider that Krafft point is well above room temperature. Dissolution will take time and/or intense mixing. Further check the pH which should be in the range of 9 or higher.
Furthe look into
http://www.personalcaremagazine.com/Print.aspx?Story=8744
Hi,
The stearic acid is first heated and melted (about 70 ° C), and then 1.1-1.2 eq of triethanolamine is added to cause a salt formation reaction to obtain a triethanolamine stearate salt.
The salt has a certain water solubility, and then a sodium hydroxide solution or a sodium chloride solution is added, and a precipitation reaction occurs to obtain a relatively pure solid sodium stearate, filtrate and wash the filter cake (must completely remove the triethanolamine or its hydrochloride), dry it.
Thank you Chen Jingwen . It's been a while since I got back to this question I posted. But thank you for following up on this. My research group at the university may find your answer helpful along with other people who are reading/researching on it.
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