Separation process

Details Separation process Separation process

2005-11-15

2005-11-15

Manoharan, Virginia (Department: 1764)

Distillation: processes, separatory

Addition of material to distilland to inhibit or prevent...

C203S019000, C203S038000, C203S041000, C203S047000, C203S057000, C203S100000, C203SDIG001, C568S749000, C568S890000, C568S913000

Reexamination Certificate

active

06964728

ABSTRACT:
Bisphenol-A-bis(neopentylglycolphosphate) products of enhanced properties and processes for preparing them are described. One of the processes includes (a) mixing and reacting neopentyl glycol and bisphenol-A-bis(dichlorophosphate) in an inert polar organic solvent which (1) if mixed by itself with an equal volume of water at 25° C., will form a separate phase, (2) the solvent by itself will dissolve at least about 10 wt % of bisphenol-A-bis(neopentylglycolphosphate) at a temperature in the range of 25 to 50° C., and optionally but preferably (3) the solvent by itself can be completely vaporized at a temperature below about 180° C.; (b) washing bisphenol-A-bis(neopentylglycolphosphate) product formed in a) while dissolved in inert organic solvent having such characteristics at least once with an aqueous alkaline washing solution; and (c) optionally but preferably, recovering bisphenol-A-bis(neopentylglycolphosphate) product from organic solvent having such characteristics. The reaction of (a) can be conducted in an inert non-polar solvent if that solvent is replaced by an inert polar organic solvent satisfying (1) and (2), and preferably (3). A solvent satisfying (1), (2), and (3) is used when (c) is conducted by distilling or vaporizing off the solvent to recover the bisphenol-A-bis(neopentylglycolphosphate) product as such. The product has a low acid number or a high thermal stability, and usually both.

REFERENCES:
patent: 2165378 (1939-07-01), Hickman
patent: 3182088 (1965-05-01), Hennis
patent: 3234289 (1966-02-01), Hennis
patent: 3347937 (1967-10-01), Carr et al.
patent: 4302614 (1981-11-01), Dannenberg et al.
patent: 4701568 (1987-10-01), McKinnie et al.
patent: 5395994 (1995-03-01), Williams et al.
patent: 5527971 (1996-06-01), McKinnie
patent: 5723690 (1998-03-01), McKinnie
patent: 5847232 (1998-12-01), McKinnie
patent: 6002050 (1999-12-01), McKinnie
patent: 6084136 (2000-07-01), Holub et al.
patent: 6084137 (2000-07-01), McKinnie et al.
patent: 6300527 (2001-10-01), Manimaran et al.
patent: 1049071 (1966-11-01), None
patent: 2049452 (1980-12-01), None
patent: 9837046 (1998-08-01), None

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