| 摘要 |
PROBLEM TO BE SOLVED: To provide an inexpensive method by which very pure dimethylaminoacetonitrile(DMAA) solution is obtained directly in storage-stable form. SOLUTION: The present invention relates to a method for preparing color stable aqueous solution of dimethylaminoacetonitrile from formaldehyde source, dimethylamine and hydrocyanic acid. In the method, reaction mixture contains 2,4-diamino-6-phenyl-1,3,5-triazine (benzoguanamine) in a concentration of 0.001-5 wt.% based on formaldehyde and the starting materials are used stoichiometrically or in a ratio of 0.98-1.02 mol of formaldehyde and 0.90-1.10 mol of dimethylamine per mol of hydrocyanic acid. The resulting product remains color-stability without a further purification step even after prolonged storage.
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