A method for preparing (dimethylaminomethylene) malononitrile by using a micro reaction system. Cyanoacetamide, N,N-dimethylformamide and a catalyst are mixed to obtain a mixture, and the mixture and phosphorus oxychloride are simultaneously pumped into the micro reaction system that includes a micromixer and a microchannel reactor connected in series for continuous dehydration condensation. After adjusted to a target pH, the crude product is subjected to continuous liquid-liquid extraction with an organic solvent in a centrifugal extraction unit comprising a plurality of annular centrifugal extractors connected in series. The organic phase is collected to obtain the target product (dimethyl aminomethylene) malononitrile.

A method for preparing (dimethylaminomethylene) malononitrile by using a micro reaction system. Cyanoacetamide, N,N-dimethylformamide and a catalyst are mixed to obtain a mixture, and the mixture and phosphorus oxychloride are simultaneously pumped into the micro reaction system that includes a micromixer and a microchannel reactor connected in series for continuous dehydration condensation. After adjusted to a target pH, the crude product is subjected to continuous liquid-liquid extraction with an organic solvent in a centrifugal extraction unit comprising a plurality of annular centrifugal extractors connected in series. The organic phase is collected to obtain the target product (dimethyl aminomethylene) malononitrile.

According to the present disclosure, there is provided a preparation method of an acrylonitrile dimer capable of obtaining an acrylonitrile dimer with high purity and enhancing process efficiency and economic feasibility by easily recovering the catalyst used in the reaction.

According to the present disclosure, there is provided a preparation method of an acrylonitrile dimer capable of obtaining an acrylonitrile dimer with high purity and enhancing process efficiency and economic feasibility by easily recovering the catalyst used in the reaction.

A method for preparing an acrylonitrile dimer according to the present disclosure makes it is possible to efficiently recover an acrylonitrile dimerization catalyst while reducing the process load.

A method for preparing an acrylonitrile dimer according to the present disclosure makes it is possible to efficiently recover an acrylonitrile dimerization catalyst while reducing the process load.

A method for preparing an acrylonitrile dimer according to the present disclosure makes it is possible to efficiently recover an acrylonitrile dimerization catalyst while reducing the process load.

The present disclosure relates to a method for preparing acrylonitrile dimer.

The present disclosure relates to a method for preparing acrylonitrile dimer.

The present invention relates to an improved process for addition of hydrogen cyanide across olefins and, in particular, to the use of a specific aluminum oxide to catalyze the reaction. The aluminum oxide catalyst must have total alkali metal and/or alkaline earth metal content, measured in the form of alkali metal oxide and/or alkaline earth metal oxide, of less than 3,000 ppm by weight.