NITROGEN-CONTAINING COMPOSITION AND MANUFACTURING METHOD THEREFOR

WIPO Patent Application WO/2011/087062

A1

Provided is a method in which the addition of an acid is used to recover an aliphatic carboxylic acid from an aqueous solution that contains an ammonium salt of an aliphatic carboxylic acid obtained from a feedstock of biological origins, wherein an ammonium salt of sulfuric acid and a nitrogen-containing composition generated as side products can be stably and efficiently recovered. The provided method, which is used to manufacture a nitrogen-containing composition from an aqueous solution that contains an ammonium salt of an aliphatic carboxylic acid obtained from a feedstock of biological origins, is characterized by the inclusion of: a crystallization step in which an ammonium salt of sulfuric acid is concentrated and crystallized from an aqueous solution containing an ammonium salt of sulfuric acid; a solid-liquid separation step in which solid-liquid separation is performed on the ammonium salt of sulfuric acid obtained in the crystallization step; and a mother-liquor recycling step characterized in that some but not all of the mother liquor obtained in the solid-liquid separation step is recycled in at least one step among steps up to and including the crystallization step.

MORI YOSHIAKI
TAKAHASHI GOU

PCT/JP2011/050453

July 21, 2011

January 13, 2011

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MITSUBISHI CHEM CORP (JP)
MORI YOSHIAKI
TAKAHASHI GOU

C01C1/24; B01D9/02; C05C3/00

JP2001514900A	2001-09-18
JP2005295998A	2005-10-27
JP2004010408A	2004-01-15
JPH05213615A	1993-08-24
JPS51122699A	1976-10-26
JPS4830239B1	1973-09-18
JPH09500649A	1997-01-21
JP2007511461A	2007-05-10
JP2005139137A	2005-06-02
US3264060A	1966-08-02
EP0126058A1	1984-11-21
DD289259A5	1991-04-25

HAMADA Yuriko et al. (JP)
Yuriko Hamada (JP)

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