Freezing point, acrylonitrile

Acrylonitrile (2-propenonitrile, propene nitrile, vinyl cyanide, CH2=CHCN freezing point -83.5°C, boiling point 77.3°C, density 0.806) used to be manufactured completely from acetylene by reaction with hydrogen cyanide. 

Table 11.2 presents fundamental physical properties for the key components implied in separations. The difference in the boiling points favors the separation, except of acrylonitrile and acetonitrile. The differences in the freezing point are also sensitive, but they did not justify the investment in a separation by crystallization. It remains that distillation-based separation methods should be tried in the first place. However, the formation of azeotropes of components with water will present difficulties. 

Fig. 14.1. Balance of oil resistance and Gehman freeze point for various copolymers of n-butyl acrylate. O, n-BA only O, n-BA/N,N-dimethyl acrylamide , n-BA/acrylonitrile A, n-BA/ethyl acrylate V, -BA/2-cyanoethyl acrylate x, n-BA/l,l,4-trihydroperfluorobutyl acrylate. (After Tucker and Jorgensen, 1968.)...

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