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US 4,233,408 AGranted
Polyurethane foams from polyester precursor derived from adipic acid process waste
AssigneeWitco Chemical Corporation
InventorsKenneth P. Satterly, Frank E. Livingston
Life of this patent
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Abstract
A waste stream of nonvolatiles is recovered (NVR) as a by-product from the oxidation of cyclohexane to cyclohexanone and cyclohexanol in the process for making adipic acid. The NVR is partially dehydrated, and then reacted with an esterifying polyol to form a polyester polyol product which is useful in producing polyurethane foams. A particularly useful end-product is a rigid polyurethane foam having good cell structure and a density of at least 2.0 lb./cu. ft.
Claims9
A process for making polyurethane comprising reacting an organic polyisocyanate with a polyester polyol prepared by:
- a. oxidizing cyclohexane to form cyclohexanone, cyclohexanol and a non-volatile residue;
- b. separating out the non-volatile residue;
- c. reducing the water content of the residue to about less than 15% by weight;
- d. reacting the recovered residue from (c) with an esterifying polyol to form a polyester polyol.
1 more element
Dependencies are inferred from the claim text.