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
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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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