ES276021A3 - A continuous procedure for the separation of cyclohexane from a fraction of isoheptanes containing cyclohexane (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

A continuous process for separating cyclohexane, which consists in continuously passing a liquid mixture containing isoheptans and cyclohexane, from a zone of relatively high temperature to a zone of relatively low temperature, in an extensive zone of separation and purification, under conditions such that the temperature of said liquid mixture gradually decreases; maintaining, by indirect heat exchange, in said relatively high temperature zone a temperature a little higher than that of the melting point of the pure cyclohexane crystals; maintaining, by indirect heat exchange, said zone of relatively low temperature, at a temperature lower than the solidification point of the crystals containing cyclohexane and isoheptanes, but higher than the temperature at which the entire mixture solidifies, so that crystals of multiple components are formed in it; to pass, continuously and mechanically, said crystals towards said zone of relatively high temperature, so that their temperature increases gradually and the concentration of isoheptanes decreases therein, and finally, completely melting the cyclohexane crystals; continuously passing a portion of the molten cyclohexane to said low temperature zone, in the form of reflux; continuously introducing said fraction of isoheptanes, as a feedstock into said liquid mixture, through a point situated between said zones, so as to provide an essentially crystallization zone between said point and said low temperature zone and a purification zone between said point and said high temperature zone; and continuously withdrawing liquid cyclohexane from said relatively high temperature zone and a liquid rich in said isoheptanes, and over in cyclohexane, from said relatively low temperature zone. (Machine-translation by Google Translate, not legally binding)