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External circulation sampling system and external circulation type two-channel online sampling analysis system

A circulation system, sampling analysis technology, applied in the direction of analyzing materials, material separation, measuring devices, etc., can solve the problems of sample waste, affecting sampling operations, liquid level changes, etc., to achieve less sampling, accurate sampling results, and automated analysis high degree of effect

Inactive Publication Date: 2016-05-25
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, this method is limited by the negative pressure system, that is, it needs to be pressurized with an inert gas under negative pressure conditions before sampling
On the other hand, this method is also limited by the high-pressure system. Due to the contact between the sample and the air during this process, the gas-liquid phase composition of the sample changes at ambient temperature and pressure.
In the gas-liquid phase equilibrium experiment or liquid-liquid phase equilibrium experiment, if the component analysis of the changed liquid phase is performed directly, it cannot truly reflect the true composition of the components in the device.
At this stage, there are also reports in the literature that the content analysis of the liquid phase components under environmental conditions is carried out, and then the liquid phase composition under the original conditions is released. The accuracy of the results of this method is not only related to the measurement method but also closely related to the estimated relationship. , The calculation process is complicated
Furthermore, this sampling method needs to use the components under the new equilibrium conditions to flush the sampling port, that is, to release the sample remaining in the sampling pipeline from the previous sampling to ensure that samples representing the new equilibrium components are obtained, resulting in sample waste. The liquid level changes, affecting the next sampling operation

Method used

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  • External circulation sampling system and external circulation type two-channel online sampling analysis system
  • External circulation sampling system and external circulation type two-channel online sampling analysis system
  • External circulation sampling system and external circulation type two-channel online sampling analysis system

Examples

Experimental program
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Effect test

Embodiment 1

[0051] Based on the volume of the HA-II phase balancer balance kettle produced by Jiangsu Huaan Scientific Research Instrument Co., Ltd., the volume of the balance kettle is 100mL, and the sampling port interface is 1 / 4-28UNF flat-bottom threaded interface. Select a 50ml syringe injector and install it on the high-pressure injection pump. Sealed with 316 and Viton or perfluorinated O-rings, this syringe is ideal for applications with corrosive, viscous liquids, or high-pressure processes. The parameters of the syringe are: volume 50mL, barrel length 140mm, stroke 76.8mm, outer diameter 32mm, inner diameter 28.6mm, and total length 165mm. The rated linear thrust of the selected high-pressure syringe pump is greater than 450N. When a 50mL syringe is installed, the maximum outlet pressure can reach 0.56MPa, and its flow range is 3.2121μl / min-83.5152ml / min. Extraction, extraction first and then injection, continuous five working modes. The maximum pressure of the two miniature hi...

Embodiment 2

[0057] Example 2: The ternary liquid-liquid phase equilibrium data under the conditions of 50° C. and 200 kPa were measured using the above-mentioned implementing device. Select the cyclohexyl-benzene-sulfolane system as the experimental object, add 50mL of a mixed solution of benzene and sulfolane with a mass ratio of 1:1 into the balance kettle, add different amounts of cyclohexane into the balance kettle, stir well and let it stand Separate layers, measure the liquid phase composition of the upper and lower layers, and t=10min in the six-way valve switching program. Each group composition was measured three times and the average value was taken. Obtain a series of liquid-liquid equilibrium data such as Figure 5 shown. The results show that the cyclohexyl-benzene-sulfolane system has good consistency with the liquid-liquid phase equilibrium data estimated by the NRTL model, and the results of this example are accurate.

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Abstract

The invention provides an external circulation sampling system. The external circulation sampling system comprises a first sampling port, a second sampling port, a four-way valve, a first quantitative loop, a second quantitative loop, a three-way valve and an injector. The first sampling port and the second sampling port are connected with two samples to realize sampling; the four-way valve is communicated with the first sampling port; the first quantitative loop is communicated with two ports of the four-way valve respectively; the second quantitative loop is communicated with the second sampling port; the three-way valve is communicated with one port of the four-way valve and the second quantitative loop respectively; the injector is communicated with the three-way valve. Arbitrary two adjacent ports of the four-way valve are communicated, arbitrary two ports of the three-way valve can be communicated, and all parts are connected through pipelines. By addition of two external circulation loops, totally-closed sampling of two liquid phases in a kettle can be realized while a self-cleaning function of sampling circuits is realized, namely reacted or balanced materials are pumped into the stainless steel injector by a high-pressure injection pump, and adding of cleaning solvents is avoided.

Description

technical field [0001] The invention relates to the technical field of analysis equipment, and relates to a sampling external circulation system and an external circulation dual-channel online sampling analysis system. Background technique [0002] With the development of science and technology and social economy, the chemical industry has gradually developed into an industry involving many fields and varieties. chemical industry. There are many products, and the production processes are very different, but they all have a common feature: raw materials undergo a series of chemical and physical changes to obtain products. In this process: reaction and separation are the core of the entire chemical production, and the study of liquid-liquid phase equilibrium is also an important part of the study of the separation process. Liquid-liquid equilibrium data are the basis for industrial distillation technology, simulation calculation, physical property estimation, and chemical pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02
CPCG01N30/02
Inventor 汪勤张冰剑陈清林何昌春高学农
Owner SUN YAT SEN UNIV
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