Double-layer glass reactor manufacturers distillation principle analysis

Time:

2021-08-26

Source:

www.jinghuayiqi.com

Author:

京华仪器

Distillation uses the difference in volatility of the components in a mixed liquid to partially evaporate the mixed liquid, and then partially condenses the vapor to separate the contained components. It is a unit operation of mass transfer separation and can be used in oil refining, chemical industry, light industry and other industries.

`Analysis of distillation principle of double-layer glass reactor manufacturer` 　　

　　 The separation of two-component mixtures was analyzed as an example. The raw material liquid will partially vaporize after being heated, and the volatile components will be concentrated in the steam, while higher non-volatile components will be produced in the remaining liquid, which achieves the separation of the two to a certain extent. . The greater the difference in volatilization between the two, the greater the concentration of the above two substances. Industrial distillation equipment is used to directly contact the partially evaporated liquid phase with the partially condensed gas phase, thereby achieving partial evaporation of the liquid phase and partial condensation of the gas phase, that is, partial evaporation of the gas phase and partial condensation of the gas phase, thereby achieving gas phase Partial evaporation and partial condensation of the gas phase.

　　 Due to molecular motion, the molecules of a liquid tend to overflow the surface. This trend increases with increasing temperature. When a liquid is placed in a closed vacuum system, the molecules of the liquid will continue to escape, forming vapor on the surface of the liquid. The molecules will then escape from the vapor, and then the molecules will escape from the vapor back into the liquid. The vapor remains A certain amount of pressure. At this point in time, the liquid surface reaches saturation, which is called saturated vapor, and the pressure it exerts on the liquid surface is called saturated vapor pressure. The results show that the saturated vapor pressure of a liquid is only related to temperature, that is, the liquid has a certain vapor pressure at a certain temperature. Refers to the pressure experienced by a liquid when it is in equilibrium with its vapor phase, regardless of the amounts of liquid and vapor in the system.

　　 The combined operation of heating a liquid until it boils, turning it into vapor, and then cooling the vapor and condensing it back into a liquid is called distillation. Obviously, distillation can separate volatile and non-volatile substances, as well as mixed liquids with different boiling points. However, in order to obtain good separation results, the boiling points of the components of the mixture must be very different (at least 30°C or above). During normal pressure distillation, since the atmospheric pressure is usually not exactly 0.1MPa, strictly speaking, the boiling point plus a correction value should be observed, but since the deviation is usually very small, even if the atmospheric pressure differs from normal pressure by 2.7KPa, the correction value is only ± It is about 1℃, so it can be ignored.

The above is the content related to the analysis of the distillation principle of double-layer glass reactor manufacturers　　 brought to you by Jinghua Instrument . If you have any questions, you can contact us at any time and we will serve you wholeheartedly. Consultation hotline: 4000883616

Real-time information

■

The practical application of high and low temperature cycling machine and common experimental equipment supporting

—

2021-07-01