Release Time:2022-07-01  Hits:

Date of Publication: 2016-01-01

Journal: 现代化工

Volume: 36

Issue: 2

Page Number: 87

ISSN: 0253-4320

Abstract: Two-step continuous reaction process is used to synthesize
   N,N-dimethyl-1,3-propanediamine with dimethyl amine and acrylonitrile as
   raw materials. In the first step,N,N-dimethyl-amino propionitrile is
   prepared in fixed bed reactor by continuous addition reaction between
   acrylonitrile and dimethyl amine,which is then followed by the
   hydrogenation of N,N-dimethyl-amino propionitrile in the fixed bed. The
   optimal results show that, in the first step, the conversion of
   acrylonitrile and the selectivity of N,N-dimethyl-amino propionitrile
   can reach 100.00% and above 99.50%, respectively,under the following
   conditions: 1.1 h~(-1) of LHSV, 30℃ of temperature,1 MPa of pressure and
   1∶ 1 mole ratio of dimethyl and acrylonitrile. In the second step,
   adopting reflux reaction way, the conversion of N,N-dimethylamino
   propionitrile and selectivity of N,N-dimethyl-1,3-propanediamine are
   both higher than 99.50% with DCF-1Raney-Ni as catalyst, 70℃ of reaction
   temperature,6 MPa of pressure, 0.3 h~(-1) of LHSV and 0.46 wt% of NaOH.

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