Crude terephthalic acid (CTA) hydrofining preparing process proxy model modeling method

Abstract

The invention relates to a crude terephthalic acid (CTA) hydrofining preparing process proxy model modeling method. The method mainly comprises the steps: systematically analyzing a hydrogenation reaction mechanism, searching for an operating parameter that greatly influences the hydrofining preparing process to serve as a corresponding input, and using a key performance index of the hydrofining preparing process as an output, while collecting running data of actual industrial devices; performing a pre-processing operation to obtain a correspondingly eligible sample; using a topological structure to be a 5*5*2 3-layer BP neural network model; using a Levenberg-Marquardt learning algorithm to train the model; and predicting data and verifying the accuracy thereof, thereby fully describing the neural network proxy model of the CTA hydrofining preparing process and achieving the prediction of the hydrofining preparing process, so as to provide good guidance for the optimized running operations of the actual preparing process, which has significant real meanings in aspects such as stabilizing preparation, ensuring product quality, and reducing energy consumption.

Description

technical field [0001] The invention relates to a proxy model modeling method for crude terephthalic acid (abbreviated as CTA) hydrofining production process, which is a modeling method for completely describing the original industrial process by using a substitute model. Specifically, it is a proxy model modeling method for key performance indicators of CTA hydrofining production process. Background technique [0002] Purified Terephthalic Acid (PTA) is mainly used in the production of polyester, and it is also an important chemical raw material. The main reaction process is that p-xylene reacts with oxygen under catalyst conditions to generate terephthalic acid and water. After continuous process improvement and upgrading, the PTA production process is now mainly based on the American AMOCO process, the British ICI process and the Japanese Mitsui process. [0003] The overall PTA process is mainly divided into a PX oxidation unit and a CTA hydrorefining unit. Since the P...

AI Technical Summary

Problems solved by technology

Among them, the content of 4-CBA is between 2000ppm and 3000ppm. Although the content is not high, it must be removed through the CTA hydrogenation process because it has a great impact on the melting point and spinning of polyester and endangers product quality.

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