Capillary preparation is a cumbersome task when vacuum distillation is performed. First use an alcohol torch or other device capable of generating a high-temperature flame to burn a glass tube with a standard ground-mouth, pull out a capillary of appropriate length and length, and then cut the capillary to a suitable length according to the specific experimental apparatus. During this process, the operator must be very careful. If the estimation is inaccurate, the slightly longer capillary can be easily broken. If the length of the Cologne mass flowmeter is too short, the capillary tube cannot be used again; The device that can be used for tailoring according to their size, if replaced with a flask or a Krebs distillation head, the length of the capillary may not be suitable. The existence of these objective factors makes the preparation of the capillary tube a time-consuming task when vacuum distillation is performed. Use a standard rubber mouth plug to plug the straight mouth of the Kirkner's distillation head. The capillary tube made of the needle is inserted into the rubber stopper. The quick-freezing refrigerator is passed through the Kirchner's distillation head to the bottom of the bottle. The inside of the hose is also distilled under normal conditions. The appearance of 1-2 copper wires is put in it, and the air intake volume and the vacuum degree are adjusted by the elasticity of the screw clamps. The improved capillary tube can be used for several years and can be applied to different specifications of the bottle distillation head. It is very convenient to use. It is used for vacuum distillation and its distillation effect is no different from glass capillary.
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Care must be taken when producing capillaries
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