Preparation method for micron order superfine sodium chloride

A sodium chloride and micron-level technology, which is applied in the field of preparing micron-level ultrafine sodium chloride, can solve the problems of easy clogging of nozzles, difficulty in preparing micron-level ultrafine sodium chloride, environmental hazards of ultrasonic technology, etc.

Inactive Publication Date: 2009-10-28
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The particle size of sodium chloride prepared by domestic ball milling method is about 150 mesh (about 100 microns), and it is difficult to prepare micron-sized ultrafine sodium chloride by ball milling method
The spray drying method is easy to block the nozzle under high temperature drying conditions, and the sodium chloride micro

Method used

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  • Preparation method for micron order superfine sodium chloride
  • Preparation method for micron order superfine sodium chloride
  • Preparation method for micron order superfine sodium chloride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] At room temperature, add 50 ml of ethanol to 50 ml of sodium chloride saturated aqueous solution without adding modifiers, stir for half an hour, quickly filter to collect the crystals, and dry in a vacuum drying oven at 80°C.

[0018] Scan the surface morphology with a scanning electron microscope (SEM) and calculate the particle size.

[0019] When using different proportions of ethanol as an anti-solvent to prepare ultrafine sodium chloride, the particle size of sodium chloride is distributed around a few microns. When the amount of ethanol is 50 ml, the particle size of sodium chloride is 7.07 μm; the primary crystal yield is 41.4%.

[0020] The scan results are attached figure 1 .

Embodiment 2

[0022] At room temperature, add 100ml of ethanol to 50ml of sodium chloride saturated aqueous solution without adding modifiers, stir for half an hour, quickly filter to collect the crystals, and dry in a vacuum drying oven at 80°C.

[0023] Scan the surface morphology with a scanning electron microscope (SEM) and calculate the particle size.

[0024] When using different proportions of ethanol as an anti-solvent to prepare ultrafine sodium chloride, the particle size of sodium chloride is distributed around a few microns. When the amount of ethanol is 100 ml, the particle size of sodium chloride is 9.07 μm; the primary crystal yield is 60.2%.

[0025] The scan results are attached figure 2 .

Embodiment 3

[0027] At room temperature, add 200ml of ethanol to 50ml of sodium chloride saturated aqueous solution without adding modifiers, stir for half an hour, quickly filter to collect the crystals, and dry in a vacuum drying oven at 80°C.

[0028] Scan the surface morphology with a scanning electron microscope (SEM) and calculate the particle size.

[0029] When using different proportions of ethanol as an anti-solvent to prepare ultrafine sodium chloride, the particle size of sodium chloride is distributed around a few microns. When the amount of ethanol is 200 ml, the particle size of sodium chloride is 3.68 μm; the primary crystal yield is 76.5%.

[0030] The scan results are attached image 3 .

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Abstract

The invention relates to a preparation method for micron order superfine sodium chloride, namely a method for preparing the micron order superfine sodium chloride by a desolvation method. The method comprises the following steps: at room temperature, dissolving sodium chloride into water to prepare a saturated sodium chloride solution; then adding alcohols as counter solvents; adding a modifying agent; stirring the mixture; quickly filtering and collecting crystals; and drying the crystals in a vacuum drying chamber at 80 DEG C to obtain micron order superfine sodium chloride powder, wherein the alcohols can be methanol, ethanol, isopropanol, normal butanol, isobutyl alcohol, 1,2-propanediol or 1,4- butanediol, preferably the ethanol, the isopropanol or the 1,4- butanediol; and the modifying agent can be tween 80, sorbierite, citric acid, polyethyleneglycol-200 (PEG) or polyvinylpyrrolidon (PVP), preferably the sorbierite or the polyvinylpyrrolidon (PVP). The method has simple process; the productivity of the superfine sodium chloride is higher, and the modifying agent is used, so that the granular diameter of the sodium chloride can be markedly reduced and the granular diameter distribution is narrow.

Description

Technical field: [0001] The invention relates to a method for preparing ultrafine sodium chloride, in particular to a method for preparing micron-level ultrafine sodium chloride by using an antisolvent method with alcohols as an antisolvent. Background technique [0002] Sodium chloride is widely used in the food industry, in daily life, and also in glass, dyes, metallurgy and other industries. Used in the manufacture of soda ash and caustic soda and other chemical raw materials, used in ore smelting, salting in the food industry and fishery, and also used as raw materials for seasonings and refined table salt. Sodium chloride mainly comes from the salt industry. In my country, the salt industry is only a resource mining and primary processing industry, with insufficient in-depth development, low added value of products, and limited development space. With the development of the market economy, the low-level salt industry is at a disadvantage in competition. This has prompted sal...

Claims

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Application Information

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IPC IPC(8): C01D3/22B82B3/00
Inventor 殷恒波张东芝葛晨薛金娟王爱丽任敏漆琳张运生卢章准陈维广沈玉堂姜廷顺江瑞生吴占敖
Owner JIANGSU UNIV
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