Process for the manufacture of light colored dipropyleneglycol d

Details Process for the manufacture of light colored dipropyleneglycol d Process for the manufacture of light colored dipropyleneglycol d

1976-08-09

1978-09-05

Myers, Jane S.

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

Organic compounds

Carboxylic acid esters

560 77, C07C 6978

Patent

active

041122402

ABSTRACT:
Process for production of dipropyleneglycol dibenzoate isomer mixture of the formulas: ##STR1## A crude methyl benzoate containing at least 80 wt.% methylbenzoate, which is a by-product of production of dimethylterephthalate by catalytic oxidation of p-xylene and/or methyl-p-toluate and esterification of the resulting acids with methanol, is contacted with dipropylene glycol commercial isomer mixture in the presence of a catalyst for a transesterification to produce said benzoate. The catalyst is an aluminum alkoxide or an aluminum silicon alkoxide containing the group Al O Si. The product is obtained in good yield, has good color, and is useful as a plasticizer for PVC.

REFERENCES:
patent: 2822348 (1958-02-01), Haslam
patent: 3031491 (1962-04-01), Dobson et al.
patent: 3098093 (1963-07-01), Hagemeyer et al.
patent: 3194791 (1965-07-01), Wilson et al.
patent: 3356712 (1967-12-01), Renckhoff et al.
patent: 3696141 (1972-10-01), Hulsmann et al.
patent: 3784578 (1974-01-01), Swodenk et al.
Wilfong, J. Polymer Science, 54, pp. 388-389 (1961).

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