Joback method: Difference between revisions

Revision as of 15:03, 7 May 2019

Revision as of 13:21, 15 June 2019

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</ref> have shown that the quality of the Joback method is limited. The original authors already stated themselves in the original paper: "High accuracy is not claimed, but the proposed method are often as or more accurate than techniques in common use today."

The list of groups don'tdoes not cover many common molecules sufficiently. Especially aromatic compounds are not differentiated from normal ring containing components. This is a severe problem because aromatic and aliphatic components differ strongly.

The data base Joback and Reid used for obtaining the group parameters was rather small and covered only a limited number of different molecules. The best coverage has been achieved for normal boiling points (438 components) and the worst for heat of fusion (155 components). Current developments that can use data banks like the [[Dortmund Data Bank]] or the DIPPR data base have a much broader coverage.