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Patent Searching and Data


Title:
PREPARATION OF DIACETONE-2-KETO-L-GULONIC ACID
Document Type and Number:
Japanese Patent JPS57163376
Kind Code:
A
Abstract:

PURPOSE: To obtain the titled substance useful as a precursor for ascorbic acid economically in high yield, by oxidizing diacetone-L-sorbose with an oxygen- containing gas in the presence of a catalyst prepared by adding Pb, Bi, etc. to Pd and/or Pt.

CONSTITUTION: In preparing the titled substance by oxidizing diacetone-L-sorbose, a catalyst obtained by adding Pb and/or Bi to Pd and/or Pt is used, to oxidize it with an oxygen-containing gas (e.g., oxygen, air). The catalyst is usually supported by active carbon, alumina, etc. for use, the supported amount of Pd and Pt is 0.5W5wt% in the state of metal or oxide, and that of Pb and Bi is 1W5wt% in the state of metal, hydroxide, oxide, etc. In the example of preparing the catalyst, active carbon powder is soaked in an aqueous solution of chloroplatinic acid and lead nitrate, and reduced with an aqueous solution of formalin.


Inventors:
Kiyoura, Tadamitsu
Application Number:
JP1981000047147
Publication Date:
October 07, 1982
Filing Date:
April 01, 1981
Export Citation:
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Assignee:
MITSUI TOATSU CHEM INC
International Classes:
C07D317/26; B01J23/62; B01J23/644; C07B61/00; C07D307/62; C07D493/14; C07H9/04; (IPC1-7): C07D317/26