Process for increasing the direct esterification reaction rate o

Details Process for increasing the direct esterification reaction rate o Process for increasing the direct esterification reaction rate o

1989-12-08

1991-05-14

Dees, Jose G.

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

Organic compounds

Carboxylic acid esters

528279, 528283, 560 90, 560 94, 560 99, 560198, 560204, C07C 6708

Patent

active

050157590

ABSTRACT:
A process for increasing the direct esterification reaction rate between a diacid and 1,4-butanediol and for directly esterifying greater than 95% of the acid ends of the diacid by mixing in any order the diacid, the 1,4-butanediol and a catalyst compound selected from organo-titanium, organo-tin, and organo-zirconium compounds, to form a reaction mixture wherein the ratio of diol:diacid is at least 2:1 and then reacting the reaction mixture at an average temperature ranging between 190.degree. C. to 200.degree. C. for a period of time no longer than sixty minutes. The same process may be followed substituting ethylene glycol for 1,4-butanediol, provided the catalyst compound is added neat, further provided that the average reaction temperature ranges from 190.degree. C. to 200.degree. C., and also provided that the reaction mixture be reacted for a period of time no longer than seventy minutes. The product resulting from this process may be polycondensed or further treated to form a high molecular weight polymer.

REFERENCES:
patent: 4049635 (1977-09-01), Cleary
patent: 4680376 (1987-07-01), Heinze et al.

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