Method for preparing sodium carbonate and sodium hydroxide by mirabilite liquid circulation

A liquid phase circulation, Glauber's salt technology, applied in chemical instruments and methods, alkali metal compounds, alkali metal carbonates, etc., can solve the problems of low utilization rate, complex equipment, difficult waste liquid treatment, etc. The effect of reducing and simplifying the recovery process of intermediate substances

Inactive Publication Date: 2018-05-04
新疆昌吉职业技术学院
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Problems solved by technology

The ammonia-soda method has been researched and developed for hundreds of years. Both the process and the equipment are very mature, but there are still two major problems: first, the use of salt as raw material has a low utilization rate, only 72% to 73%, and the second waste Liquid handling is difficult
After the carbonization of the intermediate bisphenol A, it is a solid-liquid two-phase, and the bisphenol A is recovered by filtration for recycling. Filtration requires the use of filtration equipment, which makes the equipment complicated

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  • Method for preparing sodium carbonate and sodium hydroxide by mirabilite liquid circulation

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Embodiment 1

[0051] A kind of method for preparing soda ash and caustic soda by mirabilite liquid phase circulation method, such as figure 1 As shown, Glauber's salt 12g, water 50g, calcium oxide 6.4g, intermediate substance cresol 25g, normal pressure, reaction temperature 20°C, fully stirred, reaction time 0.5h. After the reaction is over. The calcium sulfate precipitate was separated by filtration to obtain the intermediate substance cresol sodium salt, the measured concentration was 1.24 mol / L, and the conversion rate of Glauber's salt was 91%.

[0052] Introduce carbon dioxide (content ≥ 99%) into the intermediate substance cresol sodium salt, control the carbonization temperature at room temperature, and control the carbon dioxide pressure at about 0.09M Pa. When the pH of the solution is 10, the reaction is stopped, and the carbonization solution is allowed to stand and separate into layers. Separate 25g of cresol, an intermediate substance, and add to the first step reaction for r...

Embodiment 2

[0054] A kind of method for preparing soda ash and caustic soda by mirabilite liquid phase circulation method, such as figure 1 As shown, Glauber's salt 12g, water 50g, calcium oxide 9.6g, intermediate substance cresol 36g, normal pressure, reaction temperature 70°C, fully stirred, reaction time 1h. After the reaction is over. The calcium sulfate precipitate was separated by filtration to obtain the intermediate substance cresol sodium salt, the measured concentration was 2.14 mol / L, and the conversion rate of mirabilite was 95%.

[0055] Introduce carbon dioxide (content ≥ 99%) into the intermediate substance cresol sodium salt, control the carbonization temperature at room temperature, and control the carbon dioxide pressure at about 0.09M Pa. When the pH of the solution is 10, the reaction is stopped, and the carbonization solution is allowed to stand and separate into layers. Separate the intermediate substance cresol 36g and add to the first step reaction for recycling. ...

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Abstract

The invention discloses a method for preparing sodium carbonate and sodium hydroxide by mirabilite liquid circulation. The method comprises the following steps: (1) the raw materials including 0.9-1.1parts by weight of mirabilite, 0.5-0.8 parts by weight of quicklime, 2.0-3.0 parts by weight of cresol and 4.0-4.5 parts by weight of water are mixed, uniformly stirred and subjected to a reaction under ordinary pressure for 0.5-1 h at 20-70 DEG C; (2) reaction slurry is filtered, a filtrate is a cresol-containing sodium salt solution, and a precipitate is calcium sulfate; (3) CO2 is introduced into the cresol-containing sodium salt solution, carbonization is stopped when pressure of CO2 is 0.05-0.25 MPa, carbonization temperature is 20-30 DEG C and pH of the solution is 10, the solution is layered, the upper layer is cresol, and the lower layer is a sodium carbonate solution with concentration being 10%-12%; (4) the sodium carbonate solution is evaporated and concentrated to be crystalized, sodium carbonate is prepared, or the sodium carbonate solution is causticized with calcium hydroxide for preparation of sodium hydroxide. Local mirabilite resources and different intermediate species are used, the production process and the intermediate species recovery process are simplified, the recovery flow and equipment are reduced, the reaction conditions are mild and easy to control, and energy consumption is low.

Description

technical field [0001] The invention relates to the production technology of inorganic chemicals, which belongs to the technology of producing soda ash and caustic soda by mirabilite, in particular a method for preparing soda ash and caustic soda by mirabilite liquid phase circulation method. Background technique [0002] 1. Method for preparing soda ash and caustic soda [0003] At present, the methods for preparing soda ash in the world mainly include the ammonia-soda method (also known as the Solvay method) and the combined soda-making method (also known as the Hou's soda-making method), among which the ammonia-soda method is the most widely used method. The ammonia-soda method has been researched and developed for hundreds of years. Both the process and the equipment are very mature, but there are still two major problems: first, the use of salt as raw material has a low utilization rate, only 72% to 73%, and the second waste Liquid handling is difficult. The waste liq...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D7/00C01D1/04
CPCC01D7/00C01D1/04
Inventor 袁勇张美安商昌桥
Owner 新疆昌吉职业技术学院
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