Compositions – Compositions containing a single chemical reactant or plural... – Organic reactant
Reexamination Certificate
2006-06-06
2006-06-06
Thexton, Matthew A. (Department: 1714)
Compositions
Compositions containing a single chemical reactant or plural...
Organic reactant
C562S554000, C562S575000
Reexamination Certificate
active
07056450
ABSTRACT:
An aqueous high-concentration solution of N,N-dialkylglycine, economical, easy to handle, and useful for subsequent organic chemical reactions, is provided. Also is provided a process for production thereof. The aqueous high-concentration solution of N,N-dialkylglycine which contains the N,N-dialkylglycine at a concentration of 30–80% by mass, and a metal-mineral acid salt at a content of 0.3–3% by mass can be produced industrially from an aqueous N,N-dialkylglycine alkali metal salt as the source material by the steps of(i) neutralizing an aqueous solution of an N,N-dialkylglycine alkali metal salt with a mineral acid,(ii) condensing the obtained aqueous solution by removal of water, and(iii) separating by solid-liquid separation the deposited alkali metal-mineral acid salt from the resulting slurry of the aqueous N,N-dialkylglycine solution and the alkali metal-mineral acid salt.
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Inoue Katsuhisa
Katoh Tohru
Saito Makoto
Ueda Takashi
Kao Corporation
Showa Denko K.K.
Thexton Matthew A.
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