Method for intermittently producing 4,4′-diaminodicyclohexylmethane with a low amount of the trans-trans isomer
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United States of America Patent
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Jun 24, 2014
Grant Date -
Dec 20, 2012
app pub date -
Jun 3, 2011
filing date -
Jan 7, 2011
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Abstract
The present invention discloses a method for intermittently producing 4,4′-diaminodicyclohexyl methane (H12MDA) with a low amount of the trans-trans isomer thereof, which comprises: controlling the reaction process by stopping the reaction when, except for a solvent, the reaction solution comprises MDA of 0-5 wt % and H6MDA of 1-20 wt %; and b) separating the reaction solution obtained from step a) by conventional means to obtain H12MDA product with desired purity, and allowing the un-reacted material and intermediate product to be recycled to the reactor after being accumulated. The method of the present invention decreases the amount of the trans-trans isomer in H12MDA, increases the yield of the reaction, and reduces the production cost. The present invention also provides a post treatment process of the reaction mixture.
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