Online viscosity monitoring in the reaction vessel
Thread Content
The application of online monitoring technology enables manufacturing enterprises to monitor the operation of polymerization reactors in real time. By taking into account the real-time changes in viscosity, they can adjust the feed formulation or other operating conditions promptly to control product quality, which plays an important role in improving the economic efficiency of these enterprises. To improve the reaction efficiency inside the reactor, almost all polymerization reactors are equipped with stirring devices. For a specific reaction setup, the power required for stirring depends on parameters such as the viscosity of the material, temperature, density, liquid level in the reactor, and stirring speed. Unlike ordinary viscous Newtonian fluids, the apparent viscosity of polymers changes with shear rate, and it must be modeled using the principles of fluid rheology. Through detailed mechanism analysis and taking into account the operating characteristics of specific reaction vessels, this online viscosity detection system performs real-time measurement of viscosity by constructing a nonlinear model for non-Newtonian fluids. The model requires only three input parameters (introducing additional parameters yields only minor improvements in measurement accuracy and can be ignored): (1) stirring torque, which indicates the power consumed by stirring ； (2) Stirring speed, this parameter indicates the magnitude of the shear rate ； (3) Polymer temperature: The effect of temperature on viscosity also exhibits a highly nonlinear relationship, requiring compensatory correction. Experts with different opinions are welcome to join the discussion and exchange views.
1. External forces surrounding the rheometer have a significant impact on the test results; the polymerization process itself also affects these results； 2. The material temperature during the polymerization process is within a certain range, and it is difficult to maintain it at a precise temperature; the material temperature has a significant impact on the results ；
Hello, sorry to bother you, but I was wondering what your business is? I am from the online monitoring project team at Shanghai Jiao Tong University. I saw your reply to me regarding online viscosity monitoring in reaction vessels. Thank you for recognizing our technology; you are absolutely right. I’m not sure how to address you – if it’s convenient for you, could you please provide your contact information so that we can discuss the principles behind online monitoring of slurry concentration?
Hello, I work in polymer synthesis； Online viscometers only make sense when a specialized model is developed for each individual unit ；
Our online monitoring system is designed differently for each set of equipment, taking into account its production process and operating conditions on site; individual modeling is carried out based on the characteristics of the materials.
May I ask if it’s the design institute that handles the design of polymerization processes here, or is it the production workshop in the chemical plant that conducts the process analysis?
May I ask if it’s the design institute that handles the design of polymerization processes here, or is it the production workshop in the chemical plant that conducts the process analysis?