Method for producing refined ethylene sulfite

Details Method for producing refined ethylene sulfite Method for producing refined ethylene sulfite

2006-01-31

2006-01-31

Richter, Johann (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

Reexamination Certificate

active

06992196

ABSTRACT:
Refined ethylene sulfite exhibits an excellent storage stability when used as a constituent of an electrolyte. A method of producing same has a step of reacting ethylene glycol and thionyl chloride to producing raw ethylene sulfite, a rectifying step for rectifying the raw ethylene sulfite, and a refining process for refining the raw ethylene sulfite or the rectified ethylene sulfite conducted before or after the rectifying step. The refining process is at least one process selected from the group consisting of a washing process, a dehydration process by total reflux distillation, a second rectifying process, and an absorbing process. Refined ethylene sulfite produced according to the method contains chloroethanol in an amount of not more than 1000 ppm.

REFERENCES:
patent: 346685 (1929-11-01), None
Carlson et al., Hydroxyalkylation with Cyclic Alkylene Esters. I. Synthesis of Hydroxyethylapocupreine, J. Am. Chem. Soc., 69 1952 (1947).
Malima et al., Action of Thionyl Chloride upon Polyatomic Alcohols, Proc. Imp. Acad (Japan), 1926, 2, 544-546.
Multi-Sulfur and Sulfur and Oxygen Five-and Six-Membered Heterocycles, In Two Parts, Part One, The chemistry of Heterocyclic Compounds, First published 1966 by John Wiley & Sons, Ltd.
Synthesis of Biocidal Agent of Quaternary Ammonium Intramolecular Salt Type, Jul. 8, 1994.

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