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Water dispersible granules by extrusion - Relevant parameters and impact on the process
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The work in this dissertation for obtaining the Master’s degree in Chemical and Biochemical engineering was undertaken in the Industrial Complex of Sapec Agro Portugal, SA, in the Innovation, Process & Improvement Department, from February to July, 2018.
Water dispersible granules by extrusion – Relevant parameters and impact on the process was the topic proposed by the company and aimed to increase the production of water dispersible granules (WG) obtained through extrusion, while keeping the high quality of the products.
Since it is hard to make theoretical predictions about the involved processes, it was necessary to obtain experimental data. Experiments were performed at industrial scale, during the production phase of each agrochemical studied. Thus, the production of 5 agrochemicals was monitored, verifying the moisture content and several physical and chemical properties, namely the dispersibility in water and active substance quality in order to keep the final product quality high.
The drying process was the main focus of this work, since in some products it took more than the double or triple the time than the other operations. The increase in batch size, air flux and temperature in the drying step, as well as a good isolation, were the major process modifications that increased the production capacity by 12.3, 3.3, 2.7, 2.2 and 1.7 for products A, B, C, D and E, respectively.
Whilst extrusion is a simple operation, the handling of complex products implies some care in its operation. It was determined the extrusion output increased 16.7% by raising the added water by 23%.
As for the spheronization, the impact of the compressed air introduction at the top of the equipment was studied, as well as, the batch size concluding that the best option is to use a small batch (around 7kg) with no injection of compressed air.
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Extrusion Drying WG Plant Protection Compounds Active Substances