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AssigneeClariant GmbH
InventorsRainer Fell, Gotz Wilbert, Thomas Stahrfeldt
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The present invention relates to a process for preparing a colour-stable, aqueous dimethylaminoacetonitrile solution from a formaldehyde source, dimethylamine and hydrocyanic acid, wherein the reaction mixture contains 2,4-diamino-6-phenyl-1,3,5-triazine (benzoguanamine) in a concentration of from 0.001 to 5% by weight, based on formaldehyde, prior to the reaction and the starting substances are used stoichiometrically or in a ratio of 0.98-1.02 mol of formaldehyde and 0.95-1.10 mol of dimethylamine per mol of hydrocyanic acid. The resulting product remains colour-stable without a further purification step even after prolonged storage.
Process for preparing a colour-stable, aqueous dimethylaminoacetonitrile solution from a formaldehyde source, dimethylamine and hydrocyanic acid, wherein the reaction mixture contains 2,4-diamino-6-phenyl-1,3,5-triazine (benzoguanamine) in a concentration of from 0.001 to 5% by weight, based on formaldehyde, prior to the reaction and the starting substances are used stoichiometrically or in a ratio of 0.98-1.02 mol of formaldehyde and 0.95-1.10 mol of dimethylamine per mol of hydrocyanic acid.
Aqueous dimethylaminoacetonitrile solution containing 2,4-diamino-6-phenyl-1,3,5-triazine in a concentration of from 0.001 to 2.0% by weight, based on the dimethylaminoacetonitrile.
Aqueous dimethylaminoacetonitrile solution containing 2,4-diamino-6-phenyl-1,3,5-triazine in a concentration of from 0.01 to 0.25% by weight, based on the dimethylaminoacetonitrile.
Use of 2,4-diamino-6-phenyl-1,3,5-triazine (benzoguanamine) for preparing colour-stable aqueous dimethylaminoacetonitrile solutions.
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