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Method for determining solubility of solid in supercritical ammonia, and apparatus used thereby

A supercritical and solubility determination technology, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve problems such as valve blockage and complicated operation, and achieve the effect of simple operation, convenient experimental operation and accurate experimental results

Inactive Publication Date: 2016-04-06
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The invention adopts a static method to measure the solubility of supercritical ammonia system, which overcomes some shortcomings of valve blockage and complicated operation in the existing dynamic method, and can obtain more accurate measurement experimental data compared with the traditional static method

Method used

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  • Method for determining solubility of solid in supercritical ammonia, and apparatus used thereby
  • Method for determining solubility of solid in supercritical ammonia, and apparatus used thereby

Examples

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Effect test

Embodiment 1

[0051] Embodiment 1, figure 1 A device for measuring the solubility of solids in a supercritical ammonia system (that is, a device for determining the solubility of a supercritical ammonia system) is presented, which is composed of a circulating equilibrium sampling system and a sample analysis system.

[0052] The cyclic balance sampling system includes a balance kettle 1, a sampling kettle 2 and a circulation device. The oil bath 15 is filled with methyl silicone oil, and the balance kettle 1 and the sampling kettle 2 are all immersed in the methyl silicone oil located in the inner cavity of the oil bath 15. . A pressure gauge 4 and a thermocouple 5 are provided on the balance kettle 1 .

[0053] The circulation device comprises a fully-enclosed cylindrical shell 3, and a magnetic piston 31 that can move freely against the side wall of the cylindrical shell 3 is arranged in the cylindrical shell 3. The magnetic piston 31 is formed by a cylindrical inner shell 311 and a The...

Embodiment 2

[0071] Embodiment 2, measure the supercritical ammonia system solubility of ammonium chloride: concrete operation steps are as follows:

[0072] 1. Using the Peng-Robinson gas state equation Wherein, p is the pressure, R is the ideal gas constant, T is the absolute temperature, V is the volume, a and b are parameters) estimation, under the experimental temperature and pressure conditions, the amount of liquid ammonia required for the entire circulation equilibrium sampling system is filled, Among them, at 25°C, the relative density (water) of saturated liquid ammonia is 0.603.

[0073] 2. The excess solute solid (ammonium chloride) is wrapped in an asbestos net and placed in the balance kettle 1, such as figure 1 Set up the experimental device (balanced sampling system) and use nitrogen to detect leaks above 15MPa.

[0074] Remarks: After the experiment, it should be found that there are more solute solids in the asbestos net; and the asbestos net will not hinder the exchan...

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Abstract

The invention relates to a method for determining the solubility of a solid in supercritical ammonia, and an apparatus used thereby, and discloses the apparatus for determining the solubility of a supercritical ammonia system. The apparatus is composed of a cyclic balance sampling system and a sample analyzing system; and the cyclic balance sampling system comprises a balancing kettle and a sampling kettle which are two autoclaves, a circulating device, a needle valve and an oil bath pot. The sample analyzing system comprises a valve, a gas flow meter, an ammonia gas absorption bottle (gas collecting bottle) and a corresponding titration device. The invention also discloses the method for determining the solubility of the supercritical ammonia system by using the apparatus. A design idea in the invention is derived from the determination process of the solubility of a solution at normal temperature under normal pressure, that is, a saturated solution is measured, and the solubility of the system keeps unchanged in the operating process. The above static method for determining the solubility of the supercritical ammonia system avoids the disadvantages of valve obstruction and complex operation of present dynamic methods, and allows determination experiment data to be more accurate than data obtained through traditional static methods.

Description

technical field [0001] The invention relates to a device for statically measuring the solubility of solids in supercritical ammonia. It belongs to the technical field of supercritical system solubility measurement. Background technique [0002] The supercritical state is a state exhibited by substances whose temperature and pressure are above the supercritical point. Supercritical fluid has a viscosity close to that of gas, a density close to that of liquid, a diffusion coefficient between liquid and gas, and a solubility much better than that of liquid. Therefore, supercritical technology using supercritical fluid as a solvent has been widely used in extraction processes, and has been applied to chemical reactions, water oxidation, crystallization technology, chromatography technology, liquefied coal technology, power generation technology, mineralization technology, organic pollutant degradation And the coupling with membrane separation technology, the coupling with ioni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/00
Inventor 钱超欧阳博陈新志
Owner ZHEJIANG UNIV
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