抄録
In order to obtain the fundamental conditions of cellulose triacetate manufacturing by the vapour phase method, influence of kind of catalyser, amount of cellulose, of acetic anhydride and their concentration. on the acetylation rate were investigated.
ZnCl2 was chosen as the most suitable catalyser, and cellulose was pretreated with its acetic acid solutions of various concentrations. The rate constants (k′) and the activation energies for those ZnCl2 concentrations were obtained from the Sakurada's equation; dx/dz=k′p′/xn, x=kzm
To know the value of pn′ of the equation i.e. the influence of vapour pressure of acetic anhydride, this was diluted with triacetine to various concentrations, and acetylation rates of those unsaturated vapours were measured after the Raoult's law, and the logp_??_logk relation curve, the activation energies were obtained. In the case of ordinary saturated vapour of acetic anhydride n′ is considered as zero and in cases of the unsaturated n′ increases to some positive values.
This means that in the case of ordinary reaction, acetic anhydride vapour condenses in cellulose fiber phase, cellulose reacts with this liquid phase, and the vapour pressure has almost no direct bearing on the reaction rate.
