Author/Authors :
Derakhshanfard، F نويسنده 1Department of Chemical Engineering, Ahar Branch, Islamic Azad University, Ahar, Iran , , Vaziri، A نويسنده Department ofPolymer Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran , , Fazeli، N نويسنده Department ofPolymer Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran , , Heydarinasab، A نويسنده Department of Chemical Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran ,
Abstract :
Suspension polymerization process is commonly used to produce expandable
polystyrene. In the conventional method for producing this polymer, two
different initiators are added to the process at two different temperature
levels. In the industrial scale, this process is time consuming and difficult to
control. A new method (Multi-Stage Initiator Dosing, MID) is proposed in
which the initiator is dosed into the reactor. Laboratory and bench scale tests
of this new method result in better control of the process, shorter reaction
times and better quality of the product. Optimum temperature and dosing
intervals are determined. The properties of the prepared samples by MID and
conventional methods are compared with each other. According to the
results, time process and consuming amount of initiator is reduced. Also,
absorption of pentane was evaluated comparison to conventional methods. In
fact, in this process the suspension control would be easier due to varying
dose ofinitiator in several stages.
