The problem of enhancing refrigerating capacity of disk regenerative crystallizer designed for oil dewaxing and slack wax and petrolatum deoiling processes is studied. A computer model is built to study the heat exchange process in the crystallizer. The numerical modeling data are compared with the industrial disk crystallizer test data. It is demonstrated that the proposed model adequately describes the hydro- and thermodynamic conditions of operation of the industrial apparatus and that the disk crystallizer has considerable potential for augmenting refrigerating capacity. Current production of group II and III petroleum base oils is based on two different technologies, namely, hydrocatalytic (hydrocracking of the oil or fuel profile in combination with hydrocatalytic dewaxing) and combined that includes a solvent dewaxing unit. The unit treats the raffinate after the selective purification and hydroconversion stages. The slack wax obtained is submitted to hydroisomerization. These technologies include units for deasphalting heavy resid with propane to get residual base oil component. The hydrocatalytic oil production process, in spite of all its virtues, does not help get two costly and scarce products, namely, wax and a high-viscosity oil called bright stock. The reason for this is that hydrocatalytic dewaxing cracks the wax and turns it into gas. Concomitantly, hydrocracking reduces the viscosity of the residual component to a level below what is required for bright stock production. The combined technology, which involves selective purification and solvent dewaxing processes, allows production of a wide variety of base oils, including bright stock, as well as waxes. The operating costs in this technology are higher because of use of a solvent dewaxing unit. The dewaxing unit operating costs in some cases may be more than 40% of the total costs for the whole oil block. The companies Yutec Technolgies and Petrokhim Engineering have developed a disk-shaped regenerative crystallizer, which helps reduce the solvent dewaxing unit operating cost substantially by way of increased extraction of dewaxed oil from the raffinate and reduced cost of the base oil, which increases competitiveness of the combined process. Moreover, this technology is preferable from the point of range of products obtainable. The disk regenerative crystallizer is a horizontal cylindrical apparatus partitioned by cooling disks into separate sections (Fig. 1). The filtrate produced upon separation of the wax crystals from the feed mixture, which acts as the coolant, is injected into the hollow disks. The suspension moves inside the housing, gradually overflowing from one section to another through the peripheral and central annular gaps (channels). The wax crystals form on the surface of the cooling disks and in the solution volume.