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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).
Osezingeni eliphezulu
Several days
Imiyalelo
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.
Izinto zokwakha zalesi sinyathelo:
Uwoyela ongahluziwe1 tAmathuluzi adingekayo:
Insika yokucwenga ngomfutho womoya2
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.
Amathuluzi adingekayo:
Insika yokucwenga ngevakhumu
Iphampu yomoya3
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).
Amathuluzi adingekayo:
Isihlungi esinejakhethi yomhwamuko
Umnyama wamathambo
I-thermocouple enesibonisi4
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.
Amathuluzi adingekayo:
Isihlungi esinejakhethi yomhwamuko
Ithini5
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.
Izinto zokwakha zalesi sinyathelo:
I-paraffin wax1 as requiredAmathuluzi adingekayo:
I-thermocouple enesibonisiIthiniIzinto
2- Isibambeli
- 1 as requiredIsibambeli
Amathuluzi Adingekayo
7- Isibambeli
- Isibambeli
- 1 vendor sell this, none ship to you yetIsibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
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