Method of producing dimethyl phthalate from naphthalene...

Details Method of producing dimethyl phthalate from naphthalene... Method of producing dimethyl phthalate from naphthalene...

2006-11-14

2006-11-14

Oh, Taylor Victor (Department: 1625)

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

Reexamination Certificate

active

07135588

ABSTRACT:
The present invention results to an improved and environment friendly method of producing dimethyl phthalate of about 99% purity from naphthalene based chemicals, said method comprising steps of mixing phthalic anhydride with methanol in the ratio ranging between 2:3 to 3:2, adding catalyst(s) to the mixture wherein, the ratio of phthalic anhydride and the catalyst is ranging between 3:1 to 15:1, adding a promoter to the resultant of step (b) wherein, the promoter is in the range of 1.5 to 2.0% by weight of phthalic anhydride, refluxing the resulted mixture at a temperature ranging between 60 to 100° C., for time duration ranging between 6 to 12 hrs. in the presence of benzene, wherein the ratio of benzene to phthalic anhydride is in the range of 1:5 to 2:1 to obtain distillate, neutralizing the residue with about 10% caustic soda, extracting the neutralized residue with the benzene, distilling at the temperature ranging between 140 to 150° C. under 10 mm of mercury to obtain dimethyl phthalate.

REFERENCES:
Dubey et al , Reactions of Phthalic Anhydride with Alcohols, 1997, Asian Journal of Chemistry, vol. 9, No. 3 , 1997, p. 379-387.
Chemical Abstracts, vol. 43, Jul. 25, 1949, 5767a.

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