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Process for manufacturing sodium sulfate for continuously crystallized medicament

A manufacturing process, Glauber's salt technology, applied in the field of fine chemical processing, to achieve the effect of uniform pore size, simple washing, and less consumption

Inactive Publication Date: 2011-11-09
四川省川眉芒硝有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] In Chinese Patent No. 97116654.4, a production method of frozen crystallization to produce Glauber's salt containing crystal water is introduced. It goes through dehalogenation, concentration, beach drying, collection, and impurity removal. And other technological processes, this method mainly adopts the method of cooling, concentration and sun drying, and the temperature is controlled at 18°C ​​in hot days, and 10°C in winter and spring. This one-step crystallization method produces Glauber's salt containing crystal water, but the purity of Glauber's salt produced in this way is It is not high, and it needs unfavorable factors such as a large harvesting site. At the same time, it is very unlikely to have an annual output of hundreds of thousands of tons

Method used

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  • Process for manufacturing sodium sulfate for continuously crystallized medicament
  • Process for manufacturing sodium sulfate for continuously crystallized medicament
  • Process for manufacturing sodium sulfate for continuously crystallized medicament

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Under the monitoring of the DCS automatic monitoring system and the control of the AK liquid balance flowmeter, the 24°Be concentrated raw nitric water transported downhole is removed through the three-stage pipeline filter to remove mechanical impurities, and the eight-stage ion exchanger is refined and purified to obtain extremely low impurity content. The refined nitric water is finally input into a continuous crystallization process system. In a continuous crystallization system, there are heat exchangers, crystallizers and thickeners and other equipment. The refined nitric water is carried out with 1 ℃ cold water in the heat exchanger Heat exchange to form a supersaturated solution containing 20% ​​sodium sulfate crystals—grain slurry; the crystal slurry is input from the bottom of the crystallizer, and the crystals grow to an average particle size of 0.5mm in the crystallizer, thereby forming a 35% crystal slurry , the saturated solution containing sodium sulfate i...

Embodiment 2

[0053] Under the monitoring of the DCS automatic monitoring system and the control of the AK liquid balance flowmeter, the 24-30° Be concentrated raw nitric water transported downhole is passed through the three-stage pipeline filter to remove mechanical impurities, and the eight-stage ion exchanger is refined and purified to obtain extremely low The refined nitric water with impurity content is input into a continuous crystallization process system. In a continuous crystallization system, there are heat exchangers, crystallizers and thickeners. Cold water is used for heat exchange to form a supersaturated solution containing 20% ​​sodium sulfate crystals—a crystal slurry mixture; the crystal slurry is input from the bottom of the crystallizer, and the crystal grows to an average particle size of 1.2mm in the crystallizer, thereby forming 40 % of the crystal slurry, the saturated solution containing sodium sulfate in the upper part returns to the heat exchanger from the overflo...

Embodiment 3

[0055] Under the monitoring of the DCS automatic monitoring system and the control of the AK liquid balance flowmeter, the 24-30° Be concentrated raw nitric water transported downhole is passed through the three-stage pipeline filter to remove mechanical impurities, and the eight-stage ion exchanger is refined and purified to obtain extremely low The refined nitric water with impurity content is input into a continuous crystallization process system. In a continuous crystallization system, there are heat exchangers, crystallizers and thickeners and other equipment. Cold water is used for heat exchange to form a supersaturated solution containing 15% sodium sulfate crystals—grain slurry; the crystal slurry is input from the bottom of the crystallizer, and the crystals grow to an average particle size of 0.8mm in the crystallizer, thereby forming 37% sodium sulfate. The crystal slurry, the saturated solution containing sodium sulfate in the upper part returns to the heat exchange...

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Abstract

The invention discloses a process for manufacturing sodium sulfate for a continuously crystallized medicament, which comprises the following steps of: removing mechanical impurities from underground conveyed raw nitrate solution at certain concentration through a three-level pipeline filter under the monitoring of a DCS automatic monitoring system and the regulation and control of an AK liquid balancing flow meter, refining and purifying the raw nitrate solution by using an eight-level ion exchanger to obtain refined nitrate solution with extremely low impurity content, conveying the refined nitrate solution to a continuously crystallized process system, performing solid-liquid separation on the refined nitrate solution by using a plurality of parallel centrifuges, and finally packing theseparated product by using an automatic packing system to obtain the sodium sulfate in accordance with the medicinal grade of Chinese pharmacopeia.

Description

Technical field: [0001] The invention belongs to the processing field of fine chemicals. Background technique: [0002] Sodium sulfate decahydrate is Glauber's salt, Glauber's salt (Na 2 SO 4 10H 2 O), English name: hydrous Thenardite. It contains 55.9% crystal water and 44.1% sodium sulfate. Pure mineral contains Na 2 O 19.3%, SO 3 24.8%. Monoclinic crystal system, usually in the form of granular and massive, and also in the form of shell or film. Colorless and transparent, impurities will dye it into gray, gray green, light yellow, milky white, black and so on. Vitreous luster. Streaks white. Hardness 1.5~2.0. The specific gravity is 1.48. It has a slightly bitter and salty taste. It loses water of crystallization at 100°C. It gradually loses water in dry air and turns into white powder anhydrous Glauber's salt. When burning, the flame is dark yellow. Soluble in water and glycerin but insoluble in ethanol. And anhydrous sodium sulfate is also called anhyd...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D5/16
Inventor 刘泽民李栋良刘文良苟兴无张大明李洪清李春先
Owner 四川省川眉芒硝有限责任公司
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