Single-layer glass reactorOne of the steady-state characteristics is the sensitivity of the state variables of the reactor to changes in operating parameters. This change in state variables will reversibly disappear with the recovery of operating parameters.
Temperature usually has a significant impact on reaction rate and is a common sensitivity factor in reactors. In a tubular fixed bed reactor used for strongly exothermic reactions, the hot spot temperature of the reaction tube is highly sensitive to the tube wall temperature. A slight increase in wall temperature can cause a significant rise in hot spot temperature, even exceeding the allowable range, resulting in overheating.
Single-layer glass reactordesign
(1) Adopt full kettle operation to avoid the existence of gas-liquid interface.
(2) The inlet and outlet ports should be installed in appropriate positions to ensure rapid mixing of various materials entering the system.
(3) The added initiator and electrolyte should be diluted to a sufficiently low concentration to prevent latex settling.
(4) The inner surface of a single-layer glass reactor should be smooth. The rough surface provides a place for the generation and deposition of polymers on the inner wall. Commonly used are single-layer glass reactors and polished stainless steel reactors. We use stainless steel reactors because the heat transfer coefficient of glass lined reactors is small.
(5) Moderate stirring is required to accelerate mixing and enhance heat transfer. But stirring should not be too intense, as strong turbulence and shear can cause clumping and sticking to the kettle.
(6) Fluctuations in conversion rate and surface tension can exacerbate adhesive adhesion, and the driving method and control program should ensure that the concentration of free emulsifiers in the system remains constant.
(7) Single layer glass reactors should be carefully cleaned to avoid damaging the reactor walls.
(8) When the wall temperature of the reactor is uneven or variable, it will cause the sticking of the kettle to hang glue. When designing a reactor, the heat exchange jacket should cover the outer surface of the reactor as much as possible to achieve uniform wall temperature and provide a larger heat exchange area, in order to reduce the temperature difference of the main body of the reactor wall and minimize temperature fluctuations.
