Alginate-based aerogel particles were produced by dripping alginate solution (2%, w/w) into CaCl₂ solution (100 mM) followed by solvent exchange and supercritical drying (SCD). Hydrogel particles were first produced by the dripping method. Beads were separated from the CaCl₂ cross-linking solution by filtration. Then, the solvent exchange was performed at room temperature by the immersion of the particles into ethanol/water mixtures. Next, the obtained alcogels were submitted to a SCD process at 12 MPa, 40 °C, and CO₂ flow rate from 0.27 to 0.84 kg/h, and the recovered ethanol was gravimetrically measured. Finally, a comprehensive mathematical model was employed to describe the SCD process using the law of conservation of mass. The model, which resulted in two partial differential equations for the fluid and solid phases, was numerically solved using the finite difference method, successfully validated by the experimental data and employed in the sensitivity analysis and optimization.

通过将藻酸盐溶液（2％，w / w）滴入CaCl ₂溶液（100 mM）中，然后进行溶剂交换和超临界干燥（SCD），制得基于藻酸盐的气凝胶颗粒。首先通过滴注法生产水凝胶颗粒。通过过滤从CaCl ₂交联溶液中分离出珠。然后，通过将颗粒浸入乙醇/水混合物中在室温下进行溶剂交换。接下来，将获得的醇凝胶在12 MPa，40°C和CO ₂下进行SCD处理。流速从0.27至0.84 kg / h，并用重量分析法测定回收的乙醇。最后，使用质量守恒定律，采用综合数学模型描述SCD过程。该模型使用有限差分法数值求解了固相和固相两个偏微分方程，并通过实验数据进行了成功验证，并用于灵敏度分析和优化。