United States Patent (19) 11 Patent Number: 4,645,579 Weiss Et Al
United States Patent (19) 11 Patent Number: 4,645,579 Weiss et al. 45) Date of Patent: Feb. 24, 1987 (54 PREPARATION OF AOUEOUS 4,521,285 6/1985 De Witt et al............... 204/182.4 X HYDROXYLAMINE SOLUTIONS OTHER PUBLICATIONS 75 Inventors: Franz-Josef Weiss, Neuhofen; Chemical Abstracts, vol. 102, 1985, abstract No. 134403s, Wolfgang Habermann, Mainz; Peter Stamicarbon, B. V., "Circulating Process for Preparing Hammes, Ruppertsberg; Elmar and Working Up a Hydroxylammonium Salt Solution'. Frommer, Ludwigshafen; Erwin Chemical Abstracts, vol. 94, 1981, abstract No. 141,98ly, Thomas, Freinsheim; Peter Thoma, Chang, Y. et al., "Conversion of Hydroxylamine Hydro Frankenthal, all of Fed. Rep. of chloride to Hydroxylamine Nitrate by Electrodialysis Germany and Water Splitting". 73) Assignee: BASF Aktiengsellschaft, Fed. Rep. of Chemical Abstracts, vol. 83, 1975, abstract No. 181595e, Germany Maurel, A., "Continuous Transformation of a Hydroxy lamine Salt into Another Hydroxylamine Salt'. 21 Appl. No.: 685,254 Y. Chang et al., "Chemical Abstracts', Band 94, (1981), 22 Filed: Dec. 24, 1984 p. 134. 30 Foreign Application Priority Data Primary Examiner-John F. Niebling Dec. 28, 1983 DE Fed. Rep. of Germany ....... 3347259 Attorney, Agent, or Firm-Keil & Weinkauf 51) Int. Cl. .............................................. B01D 13/02 57 ABSTRACT 52 U.S.C. ................................. 204/1824; 204/101; Aqueous solutions of hydroxylamine are prepared from 204/102; 204/182.5 aqueous hydroxylammonium salt solutions by electrodi 58) Field of Search .................... 204/101, 102, 180 P, alysis by a method in which the aqueous hydroxylam 204/1824, 182.5, 72 monium salt solution is fed into the middle zone of an electrolysis cell, which is divided into a cathode zone, 56) References Cited an anode zone and a middle zone by means of semiper U.S.
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