Manufacture of pure hydralazine salts
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United States of America Patent
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May 12, 2009
Grant Date -
Jun 7, 2007
app pub date -
Dec 7, 2005
filing date -
Dec 7, 2005
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Abstract
The present invention provides an improved process of preparing hydralazine hydrochloride, which involves the preparation of 1-chlorophthalazine salt and further reacting with hydrazine followed by purification of hydralazine hydrochloride, which is free of phosphate, does not contain any individual impurities more than 0.05%, total impurities less than 0.5%, and a hydrazine content of not more than 0.001%, and preferably less than 0.0003%. One benefit of improved purity is enhanced storage stability.
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