Large-particle (granular) semi-batch baking soda crystallization method

A technology of baking soda and large particles, applied in chemical instruments and methods, shape preparation of alkali metal carbonates, alkali metal compounds, etc., can solve problems such as poor fluidity, small particle size, uneven distribution, etc., to achieve good fluidity, The effect of large particle size and less process pollution

Inactive Publication Date: 2018-02-27
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Purpose of the invention: In order to solve the problems such as small particle size, uneven distribution and poor fluidity in existing baking soda pr

Method used

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  • Large-particle (granular) semi-batch baking soda crystallization method
  • Large-particle (granular) semi-batch baking soda crystallization method
  • Large-particle (granular) semi-batch baking soda crystallization method

Examples

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Effect test

Embodiment 1

[0026] Dissolve 558g of baking soda in 3kg of an aqueous solution at a temperature of 75°C, and then keep the solution at a constant temperature for 2 hours. After all the solids are dissolved, add 150g of baking soda seeds, start stirring at a speed of 200rpm, and drop The acceleration rate starts to drop the saturated solution of sodium carbonate at 85°C, and at the same time 3 / h into CO 2 , and discharge the fine crystals every half an hour, filter and dry after 5 hours of operation to obtain sodium bicarbonate crystals with an average particle size of 503.2 μm.

Embodiment 2

[0028] Dissolve 558g of baking soda in 3kg of an aqueous solution at a temperature of 75°C, and then keep the solution at a constant temperature for 2 hours. After all the solids are dissolved, add 150g of baking soda seeds, start stirring at a speed of 200rpm, and drop The acceleration rate starts to drop the saturated solution of sodium carbonate at 85°C, and at the same time 3 / h into CO 2 , And discharge the fine crystals every half an hour, filter and dry after 5 hours of operation to obtain baking soda crystals with an average particle size of 445.7 μm.

Embodiment 3

[0030] Dissolve 558g of baking soda in 3kg of an aqueous solution at a temperature of 75°C, and then keep the solution at a constant temperature for 2 hours. After all the solids are dissolved, add 150g of baking soda seeds, start stirring at a speed of 200rpm, and drop The acceleration rate starts to drop the saturated solution of sodium carbonate at 85°C, and at the same time 3 / h into CO 2 , And discharge the fine crystals every half an hour, filter and dry after 6 hours of operation to obtain baking soda crystals with an average particle size of 462.3 μm.

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Abstract

The invention provides a large-particle (granular) semi-batch baking soda reactive crystallization process method. The method comprises the following steps: taking a saturated aqueous solution of sodium bicarbonate and a saturated solution of base (with a principle component of sodium carbonate) as raw materials, and controlling the degree of supersaturation by utilizing a gas-liquid reaction by virtue of a seed crystal adding method, thereby obtaining the large-particle (granular) baking soda crystal product. The specific process comprises the following four steps: preparing the solution, adding the seed crystal, performing reactive crystallization and discharging fine grains. According to the method, the large-particle (granular) baking soda crystal product can be prepared.

Description

technical field [0001] The purpose of the invention is to provide a method for producing large-grain (granular) baking soda in a semi-continuous crystallization process. Background technique [0002] Refined sodium bicarbonate is commercially known as baking soda, English name: sodium bicarbonate, molecular formula: NaHCO 3 , relative molecular mass: 84.01, white opaque monoclinic crystal or crystalline powder, the particle size is usually 0.05 ~ 0.20mm. Baking soda is one of the important inorganic chemical products, it is widely used in all aspects of the national economy such as chemical industry, light industry, medicine, textile and fine chemical industry. Although the output of baking soda in my country is very high, the products of baking soda are single and cannot meet the special requirements of some enterprises and customers. Compared with foreign countries, the application range and consumption structure of baking soda in my country account for the majority in th...

Claims

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Application Information

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IPC IPC(8): C01D7/24C01D7/40A23K20/22
CPCA23K20/22C01D7/24C01D7/40C01P2004/61C01P2006/80
Inventor 朱亮谢智勇沙作良
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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