Extracting caffeine from Tea

[agregory]

Hi,

Does anyone have a prac for Extracting Caffeine from Tea (which doesn't use a banned chemical like Dichloromethane)?

Annette.

[Jazz]

Dichloromethane is not banned??? when?? by whom? I thought it is allowed for 11-12. CSIS pg 99

[lada]

Yes, it is allowed for 11-12. Dont like using it, it is chlorinated hydrocarbon, possible carcinogen, and depleteds ozone layer.
Lada

[agregory]

We don't have CSIS here in Qld, so can't refer to it. We are told to read the SDS and make a decision from that. It is classed as a Toxic substance, and the material and container must be disposed of a hazardous waste, therefore deemed by us as a chemical not to be used in a school.
From RiskAssess: Appropriate for use by 11-12 students. Potential hazards - Moderately toxic; suspected to be weakly carcinogenic; highly volatile; do not inhale vapours; lung irritant; toxic by absorption through skin.
Anyway, a teacher wants to use it for Y10 SiP......

[JelJane]

Not sure what you are allowed to use over there. Found this one that uses hexane and isopropyl alcohol. http://oxytops.wordpress.com/2012/10/31 ... -tea-bags/