Dynamic vapor-liquid balance measuring device

Abstract

The invention provides a dynamic vapor-liquid balance measuring device, which comprises an equilibrium still, a vapor-liquid separation bottle, a vapor phase condensing device and a plurality of flowtubes, wherein a stirring magneton is disposed in the equilibrium still; a liquid phase outlet is arranged at one side of the horizontal bottom of the vapor-liquid separation bottle; the top end of the first liquid phase flow tube is connected to the liquid phase outlet with an included angle of 0.5 to 10 degrees; a liquid phase sampling opening is formed in the top end of the second liquid phaseflow tube, and the portion, close to the liquid phase sampling opening, of the second liquid phase flow tube is communicated with the interior of the top end of the third liquid phase flow tube through a third liquid phase reflux shutoff valve. The dynamic vapor-liquid balance measuring device is additionally provided with the stirring magneton, and the stirring magneton is driven to rotate by oilbath heating, so as to avoid liquid flooding. The first liquid phase flow tube and the vapor-liquid separation bottle are designed to eliminate a liquid phase dead angle in an existing device. The spiral return tube is designed to eliminate the problem of volatilization loss caused by the too high temperature of liquid phase and vapor phase samples in the using process of existing device.

Description

technical field [0001] The invention belongs to the field of experimental equipment, in particular to a vapor-liquid balance measuring device. Background technique [0002] There are basically two kinds of devices for the determination of the vapor-liquid equilibrium dynamic method of miscible systems, one is commonly used for teaching, and the other is commonly used for scientific research. Through the long-term use of the above two devices for measurement work, it is found that both have their own advantages and disadvantages. [0003] For the commonly used devices for teaching, there are mainly the following shortcomings: 1) The device has no thermometer casing, and the thermometer is inserted into the balance kettle, which needs to be sealed with a rubber plug, which is easy to corrode and deform, causing air leakage, polluting the environment, and causing experimental errors; 2) The device When the device is sampling in the vapor and liquid phases, it is necessary to r...

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Problems solved by technology

[0003] For the commonly used devices for teaching, there are mainly the following shortcomings: 1) The device has no thermometer casing, and the thermometer is inserted into the balance kettle, which needs to be sealed with a rubber plug, which is easy to corrode and deform, causing air leakage, polluting the environment, and causing experimental errors; 2) The device When the device is sampling in the vapor and liquid phases, it is necessary to remove the sealing plug and use a rubber dropper to sample, which will easily cause light components to volatilize, pollute the indoor environment, and cause experimental deviations; 3) The device uses resistance wire heating, which is not suitable for stable measurement The chemical compound system with poor resistance can easily lead to the decomposition of the compound. At the same time, the resistance wire is heated by an open flame, which has potential safety hazards; 4) It is difficult to achieve stable voltage control by using resistance wire heating, and it is prone to overheating or overcooling, resulting in balance deviation and experimental errors. ; 5) It is difficult for the device to measure the low-pressure vapor-liquid equilibrium; 6) It is difficult to grasp whether the vapor-liquid two phases are in equilibrium, and it is easy to cause deviation; 7) The device is not equipped with a vapor-liquid fluid separation component, When boiling violently, the liquid phase is easy to contaminate the vapor phase sample; 8) There is no heat preservation in the rising section of the vapor phase of the device, which may easily cause the rising steam to condense prematurely

[0004] However, the commonly used devices for scientific research have the following shortcomings: 1) The device is heated by resistance wire, which is not suitable for measuring the compound system with poor stability, and it is easy to cause the compound to decompose. At the same time, the resistance wire is heated by an open flame, which has potential safety hazards; Heating, it is difficult to achieve stable voltage control, prone to overheating or overcooling, resulting in balance deviation, resulting in experimental errors; 3) The temperature of the sample taken in the vapor and liquid phases of the device is relatively high, and the sampling process is easy to volatilize and cause errors; 4) The There is a dead angle in the liquid phase sampling port of the device, and it is not easy to replace during the circulation process, and the liquid phase fluid is easy to mix into the sample and be taken out at the moment of sampling imbalance; 5) The device is difficult to operate, prone to bumping, and easy to leak when measuring low-pressure vapor-liquid equilibrium , it is difficult to collect equilibrium gas and liquid two-phase samples at the same time, and there are serious deficiencies

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