C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
260/531.8
C07C 51/43 (2006.01) C07C 51/42 (2006.01) C07C 51/487 (2006.01) C07C 63/06 (2006.01)
Patent
CA 1268477
ABSTRACT The invention relates to a process for preparing puri- fied, virtually odourless, solid benzoic acid obtained from toluene by oxidation with a gas containing molecular oxygen, by means of a treatment using an inert gas or gas mixture, wherein the benzoic acid to be purified is supplied in a liquid state to a fluid or spouted bed granulator in which the prevailing tempera- ture is below the solidification temperature of the benzoic acid and in which the benzoic acid is treated, during and possibly after the granulating process, with the said gas or gas mixture, the impurities present being taken up in whole or in part in the gas or gas mixture, upon which the benzoic acid thus purified is removed from the fluid or spouted bed device. By the above process, granulation and extraction may be combined, impurities already removed during granulation, permitting recovery of a sub- stantially odourless benzoic acid.
499296
Mutsers Stanislaus M.p.
Willems Michael H.
Wolvers Wilhelmus P.
Fetherstonhaugh & Co.
Mutsers Stanislaus M.p.
Stamicarbon B.v. (licensing Subsidiary Of Dsm)
Willems Michael H.
Wolvers Wilhelmus P.
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