Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal
Patent
1974-05-07
1976-06-08
Roberts, Elbert L.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
C-metal
C07C 6748
Patent
active
039623157
ABSTRACT:
Crude DMT containing, as impurities mainly dimethyl isophthalate, dimethyl orthophthalate and p-toluic acid methyl ester, is purified with the use of solvents known to be useful for the recrystallization of DMT in such a manner that the crude DMT in molten state is introduced with agitation into the solvent, the temperature of which is maintained above the temperature of that eutectic mixture of DMT and the main impurities associated therewith which has the highest melting point. As soon as the solvent is saturated with DMT, pure DMT crystallizes. The process is preferably carried out continuously and in a special vertical counter-current washing column.
REFERENCES:
patent: 2802861 (1957-08-01), Dijk et al.
patent: 3037048 (1962-05-01), Lotz
patent: 3502711 (1970-03-01), Claybaugh et al.
Achsel Eberhard
Giller Heinz
Hortig Hans-Peter
Seipp Heinrich
Hoechst Aktiengesellschaft
Phillips D. R.
Roberts Elbert L.
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