Type and use of rotary evaporator condenser tubes
Scope of use: The temperature of the steam is greater than 140 degrees Celsius, using an air condensing tube, the temperature is less than 140 degrees Celsius, using a straight condenser. The condenser is usually used on a flask to be tested under reflux conditions or on a distillation flask to collect the condensed liquid. Condensation of the vapor occurs on the inner wall of the inner tube. The space enclosed by the inner and outer tubes is such that the water area absorbs heat from the vapor and removes the heat. The water inlet usually has a high water pressure. In order to prevent the water pipe from falling off, the plastic tube should be tied with a tube bundle. When used in a reflux state, the lower end of the condenser tube is inserted with a rubber stopper so as to be inserted into the mouth of the flask to receive the vapor evaporated upward in the flask.
In the case of volatile liquid reactants, in order to avoid loss of reactants and to make full use of the raw materials, a condensing reflux device is designed in the generating device to return the gas to a liquid state by condensation, thereby returning and collecting. The laboratory can be realized by installing a long glass tube or a condensing return tube in the generating device.
It is composed of a straight glass tube with internal and external combination. It is mostly used for distillation operation. The steam temperature is less than 140 degrees and cannot be used for reflux. There are connecting pipe joints on the upper and lower sides of the outer pipe, and the nozzle and the water inlet are used.
How to use: When using, connect the faucet to the lower end of the connection port as a water inlet. Because the water at the inlet is lower, the water heated by the steam has a higher temperature; the hotter water will automatically flow upward due to the lower density, which helps the cooling water to circulate.
The air condensing pipe and the straight condensing pipe are mainly used for distilling off the product (including distillation and fractionation). When the boiling point of the distillate exceeds 140 degrees Celsius, an air condensing pipe is generally used to prevent the straight condensing pipe from being cooled by water to cause a large temperature difference between the glass and the glass. Burst.
The inner tube is connected by a plurality of glass spheres for refluxing organic preparation and is suitable for liquids of various boiling points. After long-term use, the rust in the spacer can be washed away with hydrochloric acid. Disadvantages: The condensed liquid is easily stuck in the glass ball after solidification. Since the water pressure at the water inlet is high, the hose is easy to fall off, and it is tied with a wire when it is used.
Reflow for organic preparation, suitable for liquids with lower boiling points.