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Continuous crystallization manufacturing process of medicinal glauber salt

A manufacturing process, Glauber's salt technology, applied in the field of fine chemical processing, can solve problems such as excessive storage equipment, low mass transfer efficiency and energy consumption, and shortened production process, so as to shorten the process, reduce operating costs, and reduce energy consumption Effect

Inactive Publication Date: 2010-12-29
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

[0012] The purpose of the present invention is to study a manufacturing process of continuous crystalline medical thenardite, so that it can overcome the shortcomings of the existing medicinal thenardite production technology, with high heat transfer and mass transfer efficiency and low energy consumption, which is conducive to large-scale production ; Overcoming the shortcomings of excessive storage equipment in the production process of Glauber's salt, shortening the production process

Method used

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  • Continuous crystallization manufacturing process of medicinal glauber salt
  • Continuous crystallization manufacturing process of medicinal glauber salt
  • Continuous crystallization manufacturing process of medicinal glauber salt

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Experimental program
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Effect test

Embodiment 1

[0035] Embodiment 1: Under the monitoring of the DCS automatic monitoring system and the control of the AK liquid balance flowmeter, the 35.8% concentration of raw nitric water transported down the well is removed through a three-stage pipeline filter to remove mechanical impurities, and the eight-stage ion exchanger is refined and purified to obtain a very The refined nitric water with low impurity content is then input into the continuous crystallization process system. In the continuous crystallization system, there are heat exchangers, crystallizers, thickeners and other equipment. The refined nitric water is mixed with cold water at 1°C 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 upper part of the saturated s...

Embodiment 2

[0037] Under the monitoring of the DCS automatic monitoring system and the control of the AK liquid balance flowmeter, the 36.2% raw nitric water transported down the well is passed through a three-stage pipeline filter to remove mechanical impurities, and an eight-stage ion exchanger is refined and purified to obtain extremely low impurity content. Refined nitric water is input into the continuous crystallization process system. In the continuous crystallization system, there are heat exchangers, crystallizers, thickeners and other equipment. Refined nitric water exchanges heat with 1°C cold water in the heat exchanger to form The supersaturated solution of 20% sodium sulfate crystals - crystal slurry mixture; the crystal slurry is input from the bottom of the crystallizer, and the crystal grows in the crystallizer to an average particle size of 1.2mm, thus forming a 40% crystal slurry, and the upper part The clear liquid of the saturated solution containing sodium sulfate ret...

Embodiment 3

[0039] Under the monitoring of the DCS automatic monitoring system and the control of the AK liquid balance flowmeter, the 26% raw nitric water transported down the well 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 impurity content. Refined nitric water is input into the continuous crystallization process system. In the continuous crystallization system, there are heat exchangers, crystallizers, thickeners and other equipment. Refined nitric water exchanges heat with cold water at 3°C ​​in the heat exchanger to form 15% supersaturated solution of sodium sulfate crystals—grain slurry; the crystal slurry is input from the bottom of the crystallizer, and the crystal grows in the crystallizer to an average particle size of 0.8mm, thus forming a 37% crystal slurry, the upper part of which contains sulfuric acid The sodium saturated solution clear liquid returns to ...

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Abstract

The invention discloses a continuous crystallization manufacturing process of medicinal glauber salt, which comprises the following step: removing mechanical impurities of original aqueous glauber salt with a certain concentration transported underground by a three-level pipeline filer under the monitoring of a DCS automatic monitoring system and the adjustment and control of an AK liquid balance flowmeter; refining and purifying by an eight-level ion exchanger to obtain refined aqueous glauber salt with a very low impurity content; introducing into a continuous crystallization process system; carrying out continuous solid-liquid separation by a multistage tandem centrifuge; and finally packing by an automatic packing system to obtain the glauber salt conforming to the pharmaceutical grade of Chinese Pharmacopoeia.

Description

Technical field: [0001] The invention belongs to the field of fine chemical processing. 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 anhydro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D5/00
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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