Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1995-02-27
1995-10-17
Acquah, Samuel A.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528272, 528298, 210601, 210620, C08G 6378
Patent
active
054592291
ABSTRACT:
A process for preparing a 1,3-propanediol-based polyester comprises contacting an aqueous stream containing acrolein byproduct with a base for a time effective to reduce the acrolein content of the aqueous stream. In a specific embodiment, a poly(propylene terephthalate) preparation process comprises the steps of:
(a) contacting 1,3-propanediol and terephthalic acid at elevated temperature to produce a reaction product mixture comprising a poly(propylene terephthalate) and an aqueous solution comprising acrolein;
(b) removing a major portion of the aqueous solution from said reaction product mixture;
(c) adding a sufficient quantity of a base to the aqueous solution to form a basic solution having a pH greater than about 7.5 and maintaining the basic solution for a time effective to lower the acrolein content thereof;
(d) optionally, diluting the basic solution with water; and
(e) optionally, biotreating the dilute basic solution for a time effective to further lower the acrolein content.
The process of the invention provides a polyester byproduct stream containing reduced levels of acrolein.
REFERENCES:
patent: 4375538 (1983-03-01), Cohen et al.
patent: 4611049 (1986-09-01), Kuratsuji et al.
patent: 5300332 (1994-04-01), Kawaguchi et al.
patent: 5382624 (1995-01-01), Hotta et al.
Chou Charles C.-S.
Kelsey Donald R.
Acquah Samuel A.
Shell Oil Company
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