Process for the solvent-free preparation of ethercarboxylic...

Details Process for the solvent-free preparation of ethercarboxylic... Process for the solvent-free preparation of ethercarboxylic...

2007-04-24

2007-04-24

Zucker, Paul A. (Department: 1621)

Chemical apparatus and process disinfecting, deodorizing, preser

Process disinfecting, preserving, deodorizing, or sterilizing

Maintaining environment nondestructive to metal

C562S587000

Reexamination Certificate

active

11072033

ABSTRACT:
The invention provides a process for preparing compounds of the formula (1)where A is C2- to C4-alkylene, B is C1- to C4-alkylene, n is a number from 1 to 100, and R is C1- to C30-alkyl, C2- to C30-alkenyl, or C6— to C30-aryl, bya) alkylating a basic mixture of oxoalkylated alcohols of the formulain-line-formulae description="In-line Formulae" end="lead"?R—O-(-A-O—)n—Hin-line-formulae description="In-line Formulae" end="tail"?and alkoxides thereof with a C2- to C5-chlorocarboxylic acid in the absence of a solvent,b) converting the thus obtained ethercarboxylic acid salt to the free ethercarboxylic acid by adding an acid, the pH being adjusted to 3 or less,c) freeing the thus obtained ethercarboxylic acid, without washing, of water present down to a residual water content of <0.30% by distillation under reduced pressure, andd) removing the precipitated metal salts by filtration, so that the resulting product has a residual salt content of <0.2%.

REFERENCES:
patent: 4625057 (1986-11-01), Springmann et al.
patent: 5840973 (1998-11-01), Yasukohchi et al.
patent: 6326514 (2001-12-01), Klug et al.
patent: 2003/0194388 (2003-10-01), Dahlmann et al.
patent: 39 24201 (1991-01-01), None
patent: 1061064 (2000-12-01), None
English Abstract of DE 39 24201, published Jan. 24, 1991.
EP Search Report for Application EP05003714.2-2108PCT, Dated Jul. 27, 2005.

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