Preparation of glycol esters
Patent 4073876 Issued on February 14, 1978. Estimated Expiration Date: 
February 14, 1995. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
February 14, 1995. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3637515 3715389 3778468 3872164 3907874 Process for preparing glycols from their ester precursors Patent #: 3985795 InventorAssigneeApplicationNo. 05/701464 filed on 07/01/1976US Classes:423/508, SELENIUM OR TELLURIUM OR COMPOUND THEREOF423/509, Binary compound548/455, The additional polycyclo ring system includes a five-membered nitrogen containing hetero ring548/492, Having -C(=X)-, wherein X is chalcogen, bonded directly to ring carbon of the five-membered hetero ring (e.g., indole-2-carboxylic acids, etc.)549/473, Acyclic -C(=X)-, wherein X is chalcogen, attached directly or indirectly to the hetero ring by nonionic bonding549/484, The -C(=X)- is part of a -C(=X)X- group, wherein the X's are the same or diverse chalcogens554/134, Molecular oxygen utilized as oxidizing agent554/135, Heavy metal containing catalyst utilized558/441, Oxygen bonded directly to the carbonyl group (e.g., carboxylic acid esters, etc.)558/442, Additional carbonyl attached indirectly to the cyano group by nonionic bonding560/1, Carboxylic acid esters560/100, Naphthyl in acid moiety560/105, Carboxyl, not bonded directly to a ring, in acid moiety560/112, Polyoxy alcohol moiety560/122, Cyclopentyl-COOR, -C-COOR or -C-C-COOR560/124, Cyclopropyl in acid moiety560/152, Thio ether in acid moiety560/178, Acetoacetic acid560/187, Alkoxy in acid moiety560/20, Nitro bonded to carbon in acid moiety560/230, Polyoxy alcohol moiety560/246, Preparing polyoxy alcohol esters from olefins560/50, Polyoxy alcohol moiety560/63, Polyoxy alcohol moiety560/67Phenolic hydroxy or metallateExaminersPrimary: Weinberger, Lorraine A.Assistant: Shippen, Michael L. Attorney, Agent or FirmAbstractIn the preparation of glycol esters by the oxidation of an olefin in the presence of a catalyst comprising tellurium, wherein the accumulation of foreign metals in association with the tellurium catalyst component has an adverse effect upon the reaction, such foreign metals are maintained at low levels while the tellurium catalyst values are recovered for recycling in high yield by purging a portion of a high-boiling residual fraction produced in the distillation treatment of the reaction mixture and treating the purged portion with water and/or an aqueous alkaline solution. |
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