Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal
Patent
1975-09-02
1977-06-28
Myers, Jane S.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
C-metal
260475B, C07C 6980, C07C 6982
Patent
active
040325636
ABSTRACT:
A process is disclosed for producing the dimethyl esters of aromatic dicarboxylic acids wherein the acid is esterified with a low molecular weight alcohol, the product is crystallized and separated to isolate a mass of the diester crystals and recover a mother liquor. An improvement in such process resides in the thermal oxidation with molecular oxygen of a mother liquor material to produce a mono methylphthalate from either p-methyl toluate or methyl-4-carboxybenzaldehyde. A portion of the oxidized mother liquor is recycled to the esterification zone wherein the mono methylphthalate can be esterified to the dimethyl ester while another portion of the oxidized mother liquor stream is passed to an evaporation treatment zone, preferably a wiped film evaporator, wherein overhead material is separated from a high boiling bottoms material and recycled to the esterification reaction zone. The high boiling bottoms stream from the evaporation treatment zone is purged from the system thereby removing from the overall process high boiling organics including ash.
Harper Jon J.
Navarrete Antonio E.
Thomas Richard J.
Gilkes Arthur G.
McClain William T.
Myers Jane S.
Sloat Robert E.
Standard Oil Company
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