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Method of reducing impurity content in aqueous salt solution

A technology of aqueous solution and sodium chloride aqueous solution, which is applied in the field of trace impurities, and can solve problems such as affecting the growth of algae, increasing the turbidity of artificial seawater, and hindering the passage of light

Inactive Publication Date: 2006-03-15
NAT INST OF ADVANCED IND SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0028] However, in general, sodium chloride contains calcium sulfate, calcium carbonate, and basic magnesium chloride as poorly soluble substances, which increase the turbidity of artificial seawater, hinder the passage of light, affect the growth of algae, or adhere to the surface of algae to inhibit the growth of algae. Causes of Algae Growth
[0029] In order to prevent the formation of such insoluble substances, it is attempted to add soda ash to remove magnesium ions as a source of basic magnesium chloride and calcium ions as a source of calcium carbonate from aqueous sodium chloride solution, but if a large amount of In the case of sodium chloride, large-scale equipment is required, and it takes a long time to process, which becomes a serious problem

Method used

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  • Method of reducing impurity content in aqueous salt solution
  • Method of reducing impurity content in aqueous salt solution
  • Method of reducing impurity content in aqueous salt solution

Examples

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Effect test

Embodiment 1

[0112] Separation of potassium ions from a 1M-sodium chloride aqueous solution containing 13 mg / liter of potassium ions, 4 mg / liter of magnesium ions, and 2 mg / liter of calcium ions as impurities using a device having a liquid-feeding pump, an adsorbent column, and a fraction collector .

[0113] A glass column (about 10 mm in inner diameter and 500 mm in height) was filled with an ammonium ion-type natural zeolite (manufactured by Sunzeolite Co., Ltd., ammonia zeolite, trade name "Sanzeolite") that adsorbed about 5 μmol / g of potassium ions as an adsorbent. The average particle size is 0.5mm) to a height of 470mm, and the above-mentioned sodium chloride aqueous solution is passed through at a flow rate of 0.1ml / min in a constant temperature room (27°C). The eluate from the column at this time was extracted as 1 fraction per 2 ml, and the potassium ion concentration of each fraction was quantitatively analyzed. The potassium ion concentration elution curves in each fraction th...

Embodiment 2

[0116] Impurities were separated from a 1M-sodium chloride aqueous solution containing 13 mg / liter of potassium ions, 4 mg / liter of magnesium ions, and 2 mg / liter of calcium ions as impurities using an apparatus having a liquid-feeding pump, an adsorbent column, and a fraction collector.

[0117] A glass column (approximately 50 mm in inner diameter, 200 mm in height) is filled with H adsorbed with approximately 7 μmol / g of potassium ions as an adsorbent. + Type natural zeolite (manufactured by Sunzeolite Co., Ltd., ammonium zeolite, trade name "Sanzeolite", average particle diameter 0.5 mm) to a height of 70 mm, at a temperature of 50 ° C, the above-mentioned aqueous sodium chloride solution was passed through at a flow rate of 1 ml / min. .

[0118] Next, the eluate from the column was extracted in fractions of 2 ml, and the potassium ion concentration, magnesium ion concentration, and calcium ion concentration of each fraction were quantitatively analyzed. The results are pl...

Embodiment 3

[0120] Separation from a 1M-sodium chloride aqueous solution containing 13 mg / liter of potassium ions, 4.5 mg / liter of magnesium ions, and 3.5 mg / liter of calcium ions as impurities using a device having a liquid-feeding pump, an adsorbent column, and a fraction collector Potassium ions.

[0121] A glass column (about 10 mm in inner diameter and 500 mm in height) was filled with an ammonium ion-type natural zeolite (manufactured by Sunzeolite Co., Ltd., ammonia zeolite, trade name "Sanzeolite") that adsorbed about 5 μmol / g of potassium ions as an adsorbent. The average particle diameter is 0.5 mm) to a height of 470 mm. In a constant temperature room (27° C.), the above sodium chloride aqueous solution is passed through at a linear velocity of 30 cm / hr. Find the relationship between the ratio of the eluent volume from the column to the column volume at this time and the potassium ion concentration (mg / liter) in the eluent. The concentration elution curve thus obtained is show...

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Abstract

The invention provides a method for reducing impurity content in saline solution, wherein, water-soluble compound aqueous solution which at least comprises one trace impurity is filled with columns of absorbent which selectively absorbs the impurity; when the impurity is removed, the phenomenon of anomalous chromatogram absorption is caused, and an eluent fraction the impurity concentration of which is larger than that of the trace impurity in the prior solution; the fraction is removed, and then the trace impurity is effectively removed, thereby a water-soluble compound can be obtained in the state of high purity. When the method is used for sodium chloride aqueous solution, sodium chloride crystals with reduced impurity concentration can be obtained, and medical brine which is obtained by solubilization of sodium chloride crystals with low potassium ion concentration into water and sodium chloride compounds with low magnesium ion or calcium ion concentration which are used for cultivation of algae and preparation of artificial sea water are provided.

Description

technical field [0001] The present invention relates to a method for removing trace impurities, especially impurity ions, contained in an aqueous solution in which prescribed substances such as water-soluble inorganic salts are dissolved by utilizing anomalous adsorption chromatographic phenomenon; using the above-mentioned method to produce purified A method for crystallization of sodium chloride; obtained by dissolving refined sodium chloride crystals with less potassium ion content in water, capable of suppressing low-potassium medical saline based on dysfunction caused by potassium ions and a preparation method thereof; and dissolving in The sodium chloride composition and the preparation method of artificial seawater for preparing algae culture in water are disclosed. Background technique [0002] Distillation, recrystallization, solvent extraction, non-solvent washing, etc. are known as methods for separating each component in a mixture containing two or more component...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D15/08B01D9/02A61K47/02A61P3/02C01D3/16A01G33/00A61K33/14A61P3/12
CPCY02W10/37
Inventor 垣田浩孝苑田晃成吉原一年上嵨洋广津孝弘大井健太高岛和行岩崎哲夫山时英次
Owner NAT INST OF ADVANCED IND SCI & TECH
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