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A kind of recovery method of sodium borohydride solution

A technology of sodium borohydride and recovery method, applied in the directions of borane/diborane hydride, etc., can solve the problems of long reaction time, influence process efficiency and cost, etc., to improve the recovery rate, reduce the usage amount, and accelerate the reaction effect of speed

Active Publication Date: 2018-05-25
先进储能材料国家工程研究中心有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the recovery process generally uses a batch reactor, the reaction time is long, and the reaction requires high temperature and high pressure conditions, which affects the efficiency and cost of the process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A method for recovering sodium borohydride solution, adding sodium metaborate and metallic magnesium powder into the boiling chamber of a circulating fluidized bed at a molar ratio of 1:2.5, wherein the particle size of sodium metaborate is 40-50 μm, and the particle size of metallic magnesium powder is The particle size is 80-150 μm. Then vacuumize the boiling chamber of the circulating fluidized bed and heat it to above 150°C for 5-10 minutes to pre-dry the sodium metaborate; then continuously feed 2.5bar nitrogen into the circulating fluidized bed at a flow rate of 3m / s Preheat to 100°C in the preheating device, then nitrogen flow flows through the boiling chamber to dry the raw materials for 10 minutes, the temperature in the boiling chamber is controlled at 150°C, and the sodium metaborate is completely dehydrated until the gas water at the gas outlet at the top of the circulating fluidized bed The content is less than 100ppm. Then, at a flow rate of 5m / s, 10bar h...

Embodiment 2

[0017] A kind of recovery method of sodium borohydride solution, its step is similar to the method in embodiment 1, and its difference is:

[0018] 1. The molar ratio of sodium metaborate and metal magnesium powder is 1:2.2, the particle size of sodium metaborate is 10-20 μm, and the metal magnesium powder is also ultrafine powder, with a particle size of 20-60 μm;

[0019] 2. The pressure of nitrogen is 3bar, and the time for nitrogen to flow through the boiling chamber to dry raw materials is 5min;

[0020] 3. The pressure of hydrogen is 8bar, the time for hydrogen to flow into the boiling chamber to react with raw materials is 50min, and the temperature of the boiling chamber is controlled at 280°C;

[0021] After calculation, the recovery rate of recovering sodium borohydride from sodium metaborate by the method of this embodiment reaches more than 95%.

Embodiment 3

[0023] A kind of recovery method of sodium borohydride solution, its step is similar to the method in embodiment 1, and its difference is:

[0024] 1. The molar ratio of sodium metaborate and metal magnesium powder is 1:2.0, the particle size of sodium metaborate is 10-20 μm, and the metal magnesium powder is also ultrafine powder, with a particle size of 20-60 μm;

[0025] 2. The flow rate of hydrogen is controlled at 6m / s, the pressure is 5bar, the time for hydrogen to flow into the boiling chamber to react with raw materials is 30min, and the temperature of the boiling chamber is controlled at 300°C;

[0026] After calculation, the recovery rate of recovering sodium borohydride from sodium metaborate by the method of this embodiment reaches more than 95%.

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Abstract

The invention provides a recovery method of a sodium borohydride solution, which comprises the following steps: adding sodium metaborate and a reducer in a mole ratio of 1:(2.0-2.5) into a boiling chamber of a circulating fluid bed, wherein the temperature in the boiling chamber is controlled at 150 DEG C or above; introducing 1-5bar protective gas into a preheater of the circulating fluid bed at the flow rate of greater than 3m / s, and preheating to a certain temperature until the water content of the gas at the gas outlet on the top end of the circulating fluid bed is less than 100ppm; keeping the temperature in the boiling chamber at 250-300 DEG C, introducing a 3-10bar reducing atmosphere into the preheater of the circulating fluid bed at the flow rate of greater than 5m / s, and preheating to a certain temperature; and enabling the reducing atmosphere to flow into the boiling chamber to react with the sodium metaborate until the pressure of the reducing atmosphere in the boiling chamber becomes stable; and finally, discharging the reaction product from the bottom of the circulating fluid bed, and dissolving the reaction product in an alkaline solution, thereby obtaining the sodium borohydride solution. The method has the advantages of mature used equipment and simple technological conditions; and the recovery rate of the sodium borohydride solution can reach 95% or above.

Description

technical field [0001] The invention relates to a method for recovering sodium borohydride solution. Background technique [0002] Sodium borohydride (NaBH 4 ) can quickly react with water to generate sodium metaborate and release hydrogen gas in an aqueous solution with a pH value of less than 8 at room temperature. The chemical reaction formula is NaBH 4 +2H 2 O = NaBO 2 +4H 2 ↑. So NaBH 4 It can be used as a hydrogen storage medium and stored in a strong alkaline solution, and the hydrogen release rate and amount can be controlled by adjusting the pH value of the solution. [0003] In order to save production costs, reduce boron pollution, and realize boron recycling, researchers have been trying to recover sodium borohydride from sodium metaborate. Sodium metaborate is the reaction product of sodium borohydride and water, which can regenerate sodium borohydride by reacting with metal reducing agent and hydrogen after dehydration. The conventional process route is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B6/21
CPCC01B6/21
Inventor 欧腾蛟钟发平张洪涛王一乔
Owner 先进储能材料国家工程研究中心有限责任公司
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