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Freeze concentration for aqueous solutions

A freeze-concentration and aqueous solution technology, applied in solution crystallization, heat exchange cooling crystallization, general layout of crystallization devices, etc., can solve the problems of non-commercial application, low refrigeration efficiency, and extra energy consumption

Inactive Publication Date: 2002-08-28
梁保民 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this technology is the extra energy consumption of heating the slurry in the column, the driving force for ice crystal growth is small, and the cooling efficiency of the jacketed refrigeration method is low
All of the above techniques, with the exception of the Glencoe / Nirou approach, have not been commercialized due to various issues

Method used

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  • Freeze concentration for aqueous solutions
  • Freeze concentration for aqueous solutions
  • Freeze concentration for aqueous solutions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] This example illustrates subcooling of an aqueous solution without nucleation in a refrigeration heat exchanger.

[0060] Sucrose solutions of varying concentrations, prepared with commercial granulated sugar and water, were cooled in laboratory-scale double-pipe heat exchangers, with the solutions in the tubes and the coolant supplied by a refrigerated water bath in the annulus, operating as countercurrent. The technique described in the "Principles of Supercooling, Metastable Solutions and Instantaneous Nucleation" in the "Best Mode for Carrying Out the Invention" section was used in the experiments to achieve higher degrees of subcooling. The results of the degree of subcooling achieved without nucleation are shown in Table I.

[0061] Table I

[0062] Solution concentration Freezing point Test times Subcooling temperature difference

[0063] (weight%) (°C) (°C) (°C)

[0064] 5 -0.34 8 3.8-6.8 1.0-1.8

[0065] 10 -0.61 9 4.4-6.7 0.8-1.6

[0066] ...

Embodiment 2

[0071] This example illustrates the growth, transformation and aggregation of ice crystals in a lab-scale (1 L) multipurpose crystallizer with cooling jacket. The sucrose solutions with different concentrations are supercooled by a laboratory-scale sleeve-and-tube heat exchanger. The supercooled solution is seeded and nucleated, and the resulting fine ice crystals are separated from the concentrated solution by a filter. For the growth, transformation and aggregation of ice crystals, the obtained fine ice crystal slurry is added to a multifunctional crystallizer containing a suspension of large growing ice crystals. As a starting solution, a 5% sucrose solution was also added to the crystallizer. The mean values ​​and standard deviations of the results obtained through several experiments under different conditions are listed in Table II.

[0072] Table II

[0073] Concentration Range Low Medium Low Medium High High

[0074] Number of trials 4 6 4 6

[0075] C r (we...

Embodiment 3

[0095] This example illustrates a three-stage freeze concentration process for a sucrose solution, operated according to Figure 5 The process shown is carried out. The material balance and operating parameter data of the three freeze concentration stages and the two step combinations of the three-stage freeze concentration process are given in Table III and Table IV, respectively. The mass balance is based on 100 kg of the 5% original sucrose solution to be treated.

[0096] The meanings of the symbols in Table III and Table IV, except those already stated in Table II, are as follows:

[0097] W r - Mix the weight of the sucrose solution in the refrigerated heat exchanger.

[0098] W ri - the weight of the sucrose solution mixed with the circulating solution.

[0099] W rc - the weight of the circulating solution.

[0100] W fc - the weight of the concentrate after separation from the fine ice crystal slurry.

[0101] W fi - the weight of the ice in the fine ice cryst...

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Abstract

The invention is an efficient physical method of freezing and concentrating aqueous solutions based on the transformation of ice crystals. It results in a very high ice crystal growth rate, produces granular, aggregated large ice crystals without internal entrainment, and avoids scraping of ice crystals during freezing to save energy. The method mainly consists of the following processes: cooling the solution to a supercooled state without nucleation or ice formation on the heat transfer surface; instantly nucleating the supercooled solution to produce fine ice crystals and concentrating the solution; with the help of absorption-exotherm The growth, transformation and polymerization of ice crystals in a well-balanced and controlled environment produce large, granular or spherical ice crystals at high rates. Both single-stage and multi-stage operations can be used in this method and the main steps can be arranged flexibly. The equipment for implementing this method mainly includes refrigeration heat exchangers, nucleators, filters and multifunctional crystallizers, each of which has its own characteristics to meet the requirements of the method.

Description

technical field [0001] The invention provides a physical method for freezing and concentrating various aqueous solutions, especially the aqueous solutions in industries such as food, beverage, dairy products, medicine, nutraceuticals, biochemistry and environmental protection. technical background [0002] Concentration of aqueous solutions is a common technique in many industries. Evaporation is a widely used method of concentration of aqueous solutions. However, an effective evaporation process must be carried out at a higher temperature boiling state, which leads to the loss or destruction of volatile or heat-sensitive substances in the solution. Unlike evaporation, which converts water into vapor, freeze concentration concentrates an aqueous solution by crystallizing water into ice at temperatures as low as the freezing point. The purpose of freeze concentration of an aqueous solution may be to obtain a concentrate, or pure water, or both. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D9/00
CPCB01D9/0013B01D9/0036B01D9/0059
Inventor 梁保民石渝萍
Owner 梁保民
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