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Title:
NITROGEN-CONTAINING COMPOSITION AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2011/087062
Kind Code:
A1
Abstract:
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.

Inventors:
MORI Yoshiaki (())
森 義昭 (())
Application Number:
JP2011/050453
Publication Date:
July 21, 2011
Filing Date:
January 13, 2011
Export Citation:
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Assignee:
MITSUBISHI CHEMICAL CORPORATION (14-1, Shiba 4-chome Minato-k, Tokyo 14, 〒1080014, JP)
三菱化学株式会社 (〒14 東京都港区芝四丁目14番1号 Tokyo, 〒1080014, JP)
MORI Yoshiaki (())
International Classes:
C01C1/24; B01D9/02; C05C3/00
Foreign References:
JP2001514900A
JP2005295998A
JP2004010408A
JPH05213615A
JPS51122699A
JPS4830239B1
JPH09500649A
JP2007511461A
JP2005139137A
US3264060A
EP0126058A1
DD289259A5
Attorney, Agent or Firm:
HAMADA Yuriko et al. (Eikoh Patent Firm, Toranomon East Bldg. 10F 7-13, Nishi-Shimbashi 1-chome, Minato-k, Tokyo 03, 〒1050003, JP)
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Claims: