Test method and test device for obtaining saturated solubility and diffusion coefficients of solid solute in liquid phase simultaneously

A diffusion coefficient and testing device technology, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of heavy experimental workload, etc., and achieve the effects of improving measurement accuracy, ensuring data consistency, and short measurement time

Inactive Publication Date: 2010-12-08
NANJING UNIV OF TECH
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Problems solved by technology

[0011] Based on the problems of separate measurement of the solubility and diffusion coefficient of solid solutes in liquid phase and large experimental workload, the present invention provides a test method and a test device for simultaneously obtaining the saturation solubility and diffusion coefficient of solid solutes in liquid phase, which can not only Reduce the experimental workload and ensure the consistency of the measured data

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  • Test method and test device for obtaining saturated solubility and diffusion coefficients of solid solute in liquid phase simultaneously
  • Test method and test device for obtaining saturated solubility and diffusion coefficients of solid solute in liquid phase simultaneously
  • Test method and test device for obtaining saturated solubility and diffusion coefficients of solid solute in liquid phase simultaneously

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Embodiment 1

[0094] Test conditions: solid solute: cylindrical amorphous glucose; solvent: ethanol, methanol, temperature: 20°C. Specific steps are as follows:

[0095] 1) The first step: the preparation of cylindrical amorphous glucose, including the preparation of test samples: first, heat the crystalline glucose at 150°C for 20 minutes to form a transparent liquid, then put the molten liquid into a vacuum at a constant temperature of 152°C Vacuum in a vacuum oven at -0.1Mp for 3 minutes to remove the air bubbles in the melt; secondly, pour the melt into a stainless steel cylindrical mold; finally, cool it in the mold for 2 days and take it out to obtain a uniform, compact size of φ30mm×30mm cylindrical amorphous glucose. Install the test sample and set the test parameters according to the subsequent procedure in the first step of the operation procedure.

[0096] 2) The second step: test;

[0097] 3) The third step: parameter identification;

[0098] Figure 4a and Figure 4b It r...

Embodiment 2

[0105] According to the procedure of the first step of Example 1, the cylindrical amorphous trehalose was prepared by melting-cooling method, and according to the procedure of the second step of Example 1, the amorphous seaweed at 20°C was obtained by using a precision balance connected to an automatic data acquisition system The real-time change value of the dissolved amount of sugar in ethanol was measured for 15 minutes. On this basis, the measured value of the average mass flux of the solid-liquid interface was calculated. Next, the solubility and liquid phase diffusion coefficient of amorphous trehalose in pure ethanol are obtained according to the third step of the operation procedure.

[0106] The calculation results are shown in Table 3. It can be seen from Table 3 that when the genetic algorithm runs for 70 generations, the optimal individual of the two parameters, that is, the identification value has approached its literature value. When the genetic algorithm runs fo...

Embodiment 3

[0110] First, the compaction method is used to prepare cylindrical urea. According to the second step procedure of Example 1, a precision balance is used to connect the automatic data acquisition system to obtain the real-time change value of the dissolved amount of crystalline urea in water at 20°C. On this basis, the calculated Measured average mass flux at the solid-liquid interface. Next, calculate and obtain the solubility and liquid phase diffusion coefficient of urea in pure water according to the third step of the operation procedure.

[0111] The calculation results are shown in Table 4. It can be seen from Table 4 that when the genetic algorithm runs for 70 generations, the optimal individual of the two parameters, that is, the identification value has approached its literature value. When the genetic algorithm runs for 150 generations, the identification values ​​of each parameter The value meets the tolerance requirement. The genetic algorithm runs to 150 generati...

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Abstract

The invention relates to a test method and a test device for obtaining saturated solubility and diffusion coefficients of a solid solute in a liquid phase simultaneously. According to solute mass conservation law and Archimedes law in the process of dissolution, a physical model in the process of dissolving the solid solute is established and mathematical description of the physical model is determined so as to establish an experiment characterization method and a measurement device. In the test method and the test device, the saturated solubility and the diffusion coefficients of the solid solute in the liquid phase at a certain temperature and under certain pressure are calculated from the measured real-time dissolved amount through a specific inversion model (physical and mathematical model). The test device has the advantages of simple operation, short measuring time and capability of measuring large quantity of data; and the solubility and the diffusion coefficients are obtained simultaneously, and the measured data can be verified mutually, so the measuring accuracy is improved and the data consistency is ensured well.

Description

technical field [0001] The invention relates to a method for simultaneously obtaining the solubility and diffusion coefficient of a solid solute in a solvent, and in particular designs a method and a device for simultaneously obtaining the saturation solubility and diffusion coefficient of a solid solute in a liquid phase. Background technique [0002] The saturated solubility data and liquid phase diffusion coefficient of solid solutes in the liquid phase are important basic physical property data for the study of industrial crystallization and separation processes, mass transfer mechanisms, and chemical design and development. , The separation and purification process of special polymer monomers have been widely used. Since the measurement and theoretical description of solid solute solubility data are far more difficult than vapor-liquid and liquid-liquid systems, and the diffusion coefficient of solid solutes dissolved in liquid solvent systems is very small; in addition...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N5/00G01N13/00
Inventor 黄培胡程耀
Owner NANJING UNIV OF TECH
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