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REVERSE ENGINEERING
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IZINTO EZIGQOKWAYO
Polyvinyl Alcohol: Polyvinyl Acetate Stirred in Alcoholic Potash
Vinyl alcohol itself cannot be isolated, but its polymer can: Herrmann and Haehnel (patent 1928) stirred ground polyvinyl acetate into potash dissolved in alcohol, and polyvinyl alcohol fell out as a white, odourless powder that dissolves in water. It is the protective colloid in PVA (polyvinyl acetate) glue emulsions.
The picture: our diagram of the patent's Example I.
Ophakathi
An hour, then drying
Imiyalelo
1
1
Grind the polyvinyl acetate
Grind the polyvinyl acetate
Grind the solid polyvinyl acetate to a powder in a mortar (our method).
Izinto zokwakha zalesi sinyathelo:
I-polyvinyl acetate80 gAmathuluzi adingekayo:
Isigqulo Nomgqulo
Isikali Sedijithali Sasekhishini2
2
Dissolve the potash
Dissolve the potash
Dissolve 60 g potassium hydroxide in 50 g ethyl alcohol in a vessel you can stir. Potash burns skin and eyes.
Izinto zokwakha zalesi sinyathelo:
I-potassium hydroxide60 g
I-ethanol - izinga lelabhorethri, 95 %50 gAmathuluzi adingekayo:
Ibhikha Lengilazi
Induku Yengilazi YokugovuzaIsikali Sedijithali Sasekhishini
Amagilavu Amelana Namakhemikhali
Izibuko Zokuchitheka Kwamakhemikhali3
3
Stir in the acetate
Stir in the acetate
Add the 80 g ground polyvinyl acetate while stirring hard, and keep stirring for about half an hour. Polyvinyl alcohol precipitates.
Amathuluzi adingekayo:
Ibhikha LengilaziInduku Yengilazi YokugovuzaAmagilavu Amelana NamakhemikhaliIzibuko Zokuchitheka Kwamakhemikhali4
4
Filter and dry
Filter and dry
Collect the precipitate on a filter and dry it: a white powder without odour that dissolves in water.
Amathuluzi adingekayo:
I-funnel ye-Büchner (i-porcelain)
Iphepha Lokuhluza
Ithileyi evulekile yokomisaAmagilavu Amelana Namakhemikhali5
5
Scaling the patent's example
Scaling the patent's example
Ilayisha incwadi ye-Jupyter…
Izinto
3- Isibambeli
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Amathuluzi Adingekayo
9- Isibambeli
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