(146c) Machine Learning Techniques Applied to Classical Product Properties
- Conference: AIChE Spring Meeting and Global Congress on Process Safety
- Year: 2019
- Proceeding: 2019 Spring Meeting and 15th Global Congress on Process Safety
- Group: Industry 4.0 Topical Conference
- Time: Wednesday, April 3, 2019 - 9:00am-9:30am
Accurate and reliable predictive models for physicochemical properties of Hydrocracking process (HCK) products are extremely important. It can help petroleum refinery industries to save time and expansion on costly experiments. In our case, this is the main motivation to synthesize the available knowledge base of HCK process to build a digital twin capable of predicting the product properties of valuable petroleum fractions based on scientific principles. However, for the efficient execution of digital twins is it required to use the different steps of the Knowledge Discovery in Databases-process (KDD-process) . That means automatic extraction of non-obvious, hidden knowledge from large volumes of data . Ideally, the twin would enable:
Data cleaning and preprocessing to handle:
- missing data items by deletion or imputation approach,
- unexpected values (variables under consideration are expected to have values within a predefined range) by expert pre-processing.
- Outliers Detection to identify and remove unwanted samples from data. In this work, we use the Local Outlier Factor (LOF) technique .
- Variables selection to select optimum number of variables from a large pool of variables. In the present work we applied leaps  and Random Forests  algorithms to determine suitable descriptors.
- Machine learning to build models that characterize the impact of different physicochemical properties of the product. For this, Linear Regression, Kriging ,Support Vector Regression , Random Forest and Gradient Boosting Machine are proposed
- Validation of the models using either a dedicated database or cross-validation techniques.
The proposed twin was tested to predict the specific gravity of the vacuum gasoil (VGO), diesel and heavy naphtha cuts in Mild HCK (process that uses low to intermediary pressures and relatively low conversions). The results from this work will be presented. Results are promising but many unforeseen difficulties had to be addressed.
In the future, the proposed framework can also be used to predict other properties (cetane number, sulphur and nitrogen content, etc.) with several process (High Pressure Hydrocracking, FCC â¦). Furthermore, this type of methodology is also extended to predict industrial deactivation.
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