Preparation of isophorone diamine
AssigneeE. I. Du Pont de Nemours and Company
InventorsFrank E. Herkes, Kostantinos Kourtakis
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Abstract
Isophorone diamine is prepared from isophorone nitrile by imination using a supported heteropoly acid catalyst to form the ketimine followed by the reduction of the ketimine to form the diamine.
Claims3
A continuous process for the preparation of 3-cyano-3,5,5-trimethylcyclohexaneimine which comprises the treatment of 3-cyano-3,5,5-trimethylcyclohexanone (IPN) with ammonia in a molar ratio of 6-100 moles of ammonia per mole of IPN, at a temperature in the range of 50.degree. to 90.degree. C. and at a pressure in the range of 500 to 3500 psig, in the presence of 0.2-3 grams of a heteropoly acid catalyst supported on a refractory oxide or carbon per gram of IPN plus ammonia, wherein the catalyst remains on the support throughout the process.
A continuous process for the preparation of 3- (aminomethyl)-3,5,5-trimethylcyclohexaneamine comprising the steps of
- A. treatment of 3-cyano-3,5,5-trimethylcyclohexanone (IPN) with ammonia in a molar ration of 6-100 moles of ammonia per mole of IPN, at a temperature in the range of 50.degree. to 90.degree. C. and at a pressure in the range of 500 to 3500 psig, in the presence of 0.2-3 grams of a heteropoly acid catalyst supported on a refractory oxide or carbon per gram of IPN plus ammonia, wherein the catalyst remains on the support throughout the process;
- and
- B. reducing the imine produced in step (A) above at elevated temperature and pressure in the presence of hydrogen, ammonia and a hydrogenation catalyst.
Dependencies are inferred from the claim text.