We studied the effect of temperature gradients within a packed bed on the SuperCritical (SC) CO₂ extraction of oil from pelletized cranberry seeds. Temperature gradients were imposed on the extractor by using different temperatures for the SC-CO₂ flow and the extractor vessel wall in heating and cooling experiments (60 and 40 °C, and viceversa) for oilseed pellets and glass beads at 48 MPa. A two-phase heat transfer model and a linear-driving-force mass transfer model described temperature profiles and oil extraction curves. Overall, temperatures in the packed bed were more affected by the vessel wall than the SC-CO₂ inlet condition. Extraction curves for heating and cooling experiments were between the isothermal extraction curves for 40 and 60 °C, being affected by the vessel wall temperature in the solubility-controlled period of the extraction and approaching each other after 1-h of dynamic extraction. Both heat and mass transfer models allowed a satisfactory prediction of such a behavior and represent a step forward in the prediction of SC-CO₂ oil extraction course.

我们研究了填充床内的温度梯度对从粒状蔓越莓种子中提取油的 SuperCritical (SC) CO ₂的影响。在 48 MPa 的油籽粒料和玻璃珠的加热和冷却实验（60 和 40 °C，反之亦然）中，通过对 SC-CO ₂流和提取器容器壁使用不同的温度，将温度梯度施加到提取器上。两相传热模型和线性驱动力传质模型描述了温度分布和油提取曲线。总体而言，与 SC-CO ₂相比，填充床中的温度受容器壁的影响更大入口条件。加热和冷却实验的提取曲线介于 40 和 60 °C 的等温提取曲线之间，在提取的溶解度控制期间受容器壁温度的影响，并在动态提取 1 小时后相互接近。传热和传质模型都允许对这种行为进行令人满意的预测，并且代表了 SC-CO ₂石油提取过程预测的一个进步。