DISTILLATION DEVICE SUITABLE FOR SEPARATING SPECIALLY ZRC 4 FROM HFC 4

摘要

PURPOSE:An industrial distillation device capable of being operated safely for a sufficiently long time, consisting of a still equipped with pipes for feeding a raw material and taking out a product, a cooling means with its temperature controllable connected to the top of the still, a pressure-resistant structure of a column body epuipped with a pipe for taking out a product at its top, and a heating furnace. CONSTITUTION:The spherical still 2 in the insulating part 6 of an insulating material is connected to the approximately vertical cylindrical cooling column 3 having a smaller cross-sectional diameter than that of the still at the top of the still. On the outer periphery of the column 3, the cooler 4 or a cooling jacket for letting a refrigerant gas flow is set. When the whole length of the column is limited, the spiral plate 5 may be arranged to lengthen the disrtillation travel. A raw chloride of a raw material is fed from the pipe P1 to the still 2, the still 2 is closed hermetically, and distillation is carried out at =25atm. at =about 450 deg.C by heating the still by the heater 1. Vapor having concentrated HfCl4 is exhausted from the pipe P3 and ZrCl4 with a smaller amount of HfCl4 than a given amount is exhausted from the pipe P2. Although some unsatisfactory points may be left in hot strength with respect to corrosion resistance, cracking between granules, cost, etc., a carbon steel (SS material) is used as the material of the device.