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Petroleum Jelly: Vacuum Residue Filtered Warm Through Bone Black
Petroleum jelly (petrolatum, vaseline) is what is left of crude oil after the lighter parts are distilled off, cleaned by filtering it warm through bone black. The 1907 US Dispensatory and Thorpe (1913) describe the process: the first colourless runnings become petroleum jelly, and the later, darker filtrate is cylinder oil.
The picture: white petrolatum (Wikimedia Commons).
Hejuru
Several days
Amabwiriza
1
1
Distil off the light cuts
Distil off the light cuts
Distil crude oil in an atmospheric column and draw off the lighter cuts. Keep the residue from the bottom.
Ibikoresho by'iyi ntambwe:
Peteroli mbisi1 tIbikoresho bikenewe:
Inkingi yo gutosha mu muvuduko usanzwe w'ikirere2
2
Reduce under vacuum
Reduce under vacuum
Distil the residue further under vacuum, heated by coils carrying superheated steam, not by direct fire. Done right, the reduced oil reaches a fire-test of 337.7 °C (640 °F) without any burnt smell.
Ibikoresho bikenewe:
Inkingi yo gutosha hakoreshejwe vacuum
Pompe ikuramo umwuka3
3
Filter warm through bone black
Filter warm through bone black
Melt the reduced oil and run it onto steam-jacketed filters of fine, granular, well-dried bone black, kept at 43.3–54.4 °C (110–130 °F).
Ibikoresho bikenewe:
Akayunguruzo gafite umwuka w'amazi ashyushye
Umukara w'amagufwa
Termokupuli ifite igaragaza4
4
Keep the clear runnings
Keep the clear runnings
The first filtrate is colourless; it then turns straw or lemon, and finally red. Keep the clear runnings for petroleum jelly. The red filtrate is cylinder oil, a lubricant.
Ibikoresho bikenewe:
Akayunguruzo gafite umwuka w'amazi ashyushye
Ikopo ry'icyuma5
5
Set the melting point
Set the melting point
If the jelly is too soft, stir pure block paraffin into the warm oil until it has the right melting point. It dissolves completely. Pour it into tins to set.
Ibikoresho by'iyi ntambwe:
Ibuki rya parafine1 as requiredIbikoresho bikenewe:
Termokupuli ifite igaragazaIkopo ry'icyumaIbikoresho
2- Umwanya
- 1 as requiredUmwanya
Ibikoresho bikenewe
7- 1 vendor sell this, none ship to you yetUmwanya
- Umwanya
- Umwanya
- Umwanya
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