Detection and Automatic Control of Hydrogenation Refining of Benzene
Abstract
Benzene hydrogenation refining is an important part of the chemical chemical industry. The hydrogenation reaction process of benzene is an efficient way to improve the oil quality. However, it is difficult to control the reaction accurately, because of the complicated reaction process. In order to get better process optimization result and higher product response accuracy, advanced automatic control system should be applied in benzene hydrogenation refining. This paper emphasizes on the detection and automatic controller for such kind of benzene reaction process.
Introduction
Benzene is one of the widely used organic chemicals in the organic chemical industry. It is widely used in the production of fibers, dyes, drugs, plasticizers, gasoline and so on. In the production of petroleum, it is also an important product in the transformation of crude oil. After refining, the benzene produced can be sold directly as raw materials. Therefore, the production of benzene with high quality products is an important factor in the chemical industry.
Hydrogenation refining of benzene is an efficient way to improve the production of benzene products. In a typical process, several steps are included, including on-line hydrogenation, partial dehydration and degassing. The hydrogenation reaction procedure involves a series of alkene absorption, hydrogenation and desorption step. It is a complicated process, so it requires a perfect reaction system and refined control equipment to ensure that the products meet the characterization as required.
However, due to the complicated reaction, the traditional manual control system is difficult to ensure the product accuracy, and it’s also difficult to adjust the product structure. And it’s almost impossible to guarantee the stability of the reaction. Therefore, in order to improve the product quality and consistency, an advanced automatic control system is necessary.
Detection
The stability of the reaction is closely related to the type and amount of catalyst used. Therefore, the composition and concentration of catalysts and other components in the reaction system should be monitored in real time.
1. Catalyst type and concentration. In order to keep the optimal catalytic effect, the catalysts and catalyst activators needed in the reaction process should be monitored in real time. Firstly, the type of catalyst should be monitored. According to the process requirements, the catalyst concentration needs to be understood by the testing data. Furthermore, the degree of supersaturation of the catalyst should be monitored in certain reaction conditions. This allows for accurate control of the reaction.
2. Dissolved gases. The concentrations of the dissolved gases should also be monitored in order to adjust the pressure in the reaction system. The dissolved gases can be measured by online gas probe to understand the process condition of the reactor.
3. Solvents and reactants. In order to guarantee the completion of the reaction, the solvents and reactants should also be monitored in real-time. The concentrations of them in the system should be understood.
Automatic controller
Based on the above detection data, an advanced automatic controller can be designed to control the reaction process of benzene hydrogenation. The automatic controller can modify the process conditions according to the set parameters.
1. Process control based on monitoring data. The automatic controller can adjust the flow rate, temperature, pressure and other process conditions through the data obtained from the probes. This can efficiently control the process parameters, and will be beneficial to the entire process optimization.
2. Catalyst and reactants addition. The automatic controller can record the consumption of catalysts and reactants at each reaction step, and adjust the feed rate accordingly. Therefore, it can help to maintain the optimal reaction conditions, which is beneficial for the completion of the reaction.
3. Advanced control based on model prediction. With the help of advanced modelling and simulation methods, the automatic controller can predict the future status of the reaction system, and therefore adjust the process condition accordingly. This helps to ensure the optimal process control and maximize the product output.
Conclusion
In summary, the hydrogenation refining process of benzene is a complex process, and it requires a perfect detection and automatic controller to ensure the accuracy and consistency of the product. Advanced automatic controllers can adjust the process parameters according to the data obtained from the probes so as to get better process optimization result. Also, by using model predictions, the process controller can further improve the product output and quality.
