SU595666A1

SU595666A1 - Device for investigating phase equilibrium

Info

Publication number: SU595666A1
Application number: SU762427868A
Authority: SU
Inventors: Виктор Федорович Лисенков; Лев Аркадьевич Коган
Original assignee: Восточный научно-исследовательский углехимический институт
Priority date: 1976-11-26
Filing date: 1976-11-26
Publication date: 1978-02-28

Description

1one

Изобретение относитс к области физической химии, в частности к изучению фазового равновеси систем пар-жидкость и пар-твердое тело.The invention relates to the field of physical chemistry, in particular to the study of the phase equilibrium of the vapor-liquid and vapor-solid systems.

Известно устройство измерени фазовых характеристик сложных смесей с помощью прибора Отмера, состо щего из циркул ционной системы и перегонного куба.A device is known for measuring the phase characteristics of complex mixtures using a meter instrument consisting of a circulation system and a distillation cube.

В этом устройстве в результате многократной перегонки исследуемой смеси при конденсации паров отгона и возвращении их в куб получаетс конденсат, идентичный по составу равновесной при температуре кипени паровой фазе. Анализ конденсата затруднений обычно не вызывает.In this device, as a result of repeated distillation of the studied mixture, condensation of the distillate vapors and their return to the cube produces condensate that is identical in composition to the vapor phase that is equilibrium at the boiling point. Analysis of condensate is usually not difficult.

Недостаток этого устройства в том, что оно позвол ет получать данные о фазовом равновесии только при температуре кипени .The disadvantage of this device is that it allows to obtain data on phase equilibrium only at the boiling point.

Известно устройство дл исследовани фазового равновеси , содержащее источник газа-носител , термостатированный сосуд дл исследуемого образца, установленный на испарителе хроматографа и соединенный с испарителем капилл ром, проход щим через штуцер с уплотнением.A device for studying phase equilibrium is known, which contains a source of carrier gas, a thermostated vessel for the sample under investigation, mounted on a chromatograph evaporator and connected to an evaporator by a capillary passing through a choke seal.

Недостатком указанного устройства вл етс неполный перенос пробы из сосуда в испаритель хроматографа из-за адсорбции части пробы па поверхности капилл ра.The disadvantage of this device is the incomplete transfer of the sample from the vessel to the chromatograph evaporator due to the adsorption of a part of the sample on the capillary surface.

Цель изобретени - повышение точности исследовани .The purpose of the invention is to improve the accuracy of research.

Поставленна цель достигаетс за счет того , что капилл р имеет в средней части отверстие , установлен с возможностью перемеш .епп и соединен с источником газа-носител .This goal is achieved due to the fact that the capillary has a hole in the middle part, is installed with the possibility of mixing and is connected to a source of carrier gas.

На чертеже схематически изображено предлагаемое устройство, продольный разрез.The drawing schematically shows the proposed device, a longitudinal section.

Устройство содержит термостатированный сосуд 1. Сосуд и термостат к нему расположены па испарителе хроматографа. Сосуд имеет проход щий через центральные соосные штуцеры 2 с уплотнительиыми элементами 3 капилл р 4 с отверстием 5. Капилл р выполнен с возможностью перемещени и соединен с источником газа-носител .The device contains a thermostated vessel 1. The vessel and the thermostat to it are located on the chromatograph evaporator. The vessel has passing through central coaxial nozzles 2 with sealing elements 3 capillaries 4 with an opening 5. The capillary is movable and connected to a source of carrier gas.

Устройство работает следующим образом.The device works as follows.

Claims

The test mixture, the composition of which is predetermined, is loaded into vessel 1. An inert gas, other than the chromatographic carrier gas, is injected into the space above the mixture to a pressure exceeding the pressure of the carrier gas. At the same time, the capillary 4 is in the uppermost position and the opening 5 is tightly closed by the sealing element 3. The vessel is heated in a thermostat to the required temperature and the phases are equilibrated by keeping the mixture at this temperature for 10-15 minutes. Then the capillary 4 is moved to the lower extreme position for a short period of time and the orifice 5 leaves the seal 3. At this point, a sample of the vapor phase due to excessive pressure through the orifice and the capillary enters the chromatograph for analysis. The residence time of the capillary in the lower extreme position is limited by the volume of the sample to be taken, which must be approximately 2 orders of magnitude smaller than the volume of vapors in vessel 1. Observe this condition so as not to disturb the equilibrium in the vessel. The carrier gas is continuously fed into the chromatograph through the capillary 4, which eliminates the loss of the analyzed components of the sample due to their adsorption on the inner surface of this tube and contributes to improving the accuracy of determining the concentration of 5 10 15 20 them in the vapor phase. According to chromatographic analysis, the partial pressure of the components can also be calculated at the required temperature. A device for studying phase equilibrium can improve the accuracy of determining the composition of the vapor phase. Apparatus of the Investigation Device for Phase Equilibrium Investigation, containing a source of carrier gas and thermostated for the sample under investigation, installed at the entrance to the chromatograph evaporator and connected to the evaporator by a capillary passing through a compaction syringe, characterized in the capillary has a hole in the middle part, which is connected with a source of carrier gas and is mounted for movement.