Real-time monitoring of polyester esterification rate
Thread Content
The esterification reaction typically involves 4 substances; for example, terephthalic acid (PTA) and ethylene glycol (EG) undergo an esterification reaction under certain conditions to produce bis(2-ethyleneglycol) terephthalate (BHET) and water. There are significant differences in the density (specific gravity) of these 4 substances: the reactant PTA has a density of 1.55, EG has 1.1155, the product BHET has 1.089, and water has a density of 1.000. It is obvious that, with a constant (known) feed ratio, the density of the entire reactant system (i.e., the material system comprising the four substances mentioned above) varies depending on the degree of reaction progression (i.e., the esterification rate). Therefore, by monitoring the density of the system online and combining this data with the feed ratio, it is possible to calculate the esterification rate of the esterification reaction using a model. Given the complexity of the esterification reaction, building on the aforementioned density method and taking into account other characteristics of the esterification process, multiple approaches are employed to estimate the esterification rate, thereby forming what is known as \"multi-sensor information fusion\" in order to improve the accuracy and reliability of detecting the esterification rate. For example, the heat cross-method, the boiling point elevation method, etc. Through the above methods, parameters such as the esterification rate of the esterification reaction are calculated using models, and these values are displayed in real time on the DCS to guide production.
What is the precision of this viscosity?
Compared to the laboratory, the error is around 1%.
For those who use esterification reactions, here is the simplest fully automatic oil-water separation tank available – it allows for better separation of oil from water, with more oil being extracted when there’s plenty of oil, and more water being removed when there’s plenty of water. This results in a shorter reaction time and lower energy consumption. No manual drainage is required, and it is possible to monitor the reaction rate and depth at any time, with alerts when the reaction reaches its completion point! **Patented technology – feel free to use it!
Our online monitoring system measures various parameters such as concentration and viscosity in the chemical production process, facilitating control over production. I hope we can work together happily in the future! ! !