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Method for deactivation of active sodium sand

An active, sodium sand technology, applied in chemical instruments and methods, metal material coating technology, alkali metal compounds and other directions, can solve the problems of non-recyclable alcohol, complex treatment process, increased treatment cost, etc., and achieves low cost and dosage. Reasonable and easy to operate

Active Publication Date: 2009-08-26
大连双硼医药化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this process is quenched with ethanol or isopropanol, and the resulting sodium alkoxide reacts with water, although it is reduced to alcohol, but because alcohol and water are miscible, the alcohol cannot be recycled, thereby increasing the processing cost
In addition, quenching is carried out in two steps, which also makes the treatment process complicated and the cycle lengthened

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] In 100 grams of the system containing about 50 grams of active sodium and 50 grams of toluene, add 50 grams of common industrial liquid paraffin with a water content of less than 0.5%, replace the system with nitrogen, and cool the reactor with 0°C cold circulation at a speed of 100 rpm Add water dropwise under stirring. Keep the temperature in the reactor below 100°C during the dropwise addition. After 20 minutes, no more gas will emerge. Continue to add 100 grams of water, stir for half an hour, cool and separate layers, release the lower water layer, and add dilute The hydrochloric acid is neutralized to neutrality, and discharged; the organic layer is released, and the toluene is evaporated, and the liquid paraffin is dried with industrial sodium hydroxide until the water content is less than 0.5%, and it is ready for reuse.

Embodiment 2

[0019] Add 50 grams of liquid paraffin to 100 grams of a system containing 50 grams of n-hexane and 50 grams of active sodium, replace the system with argon, do not turn on the cold cycle, add water dropwise under stirring at 200 rpm, and maintain the temperature in the system during the dropwise addition No more than 100°C, no more gas after 45 minutes, continue to add 100 grams of water, stir for half an hour, cool and separate layers, release the lower water layer, add dilute sulfuric acid to neutralize, discharge; release the organic layer, evaporate Hexane and liquid paraffin were dried with industrial sodium hydroxide until the water content was less than 0.5%, for reuse.

Embodiment 3

[0021] In 100 grams of the system containing about 40 grams of active sodium and 60 grams of toluene, add 60 grams of common industrial liquid paraffin with a water content of less than 0.5%, replace the system with nitrogen, and cool the reactor with 0°C cold circulation at a speed of 150 rpm Add water dropwise under stirring. Keep the temperature in the reactor below 100°C during the dropwise addition. After 18 minutes, no more gas will emerge. Continue to add 100 grams of water, stir for 40 minutes, cool and separate layers, release the lower water layer, and add dilute The hydrochloric acid is neutralized to neutrality, and discharged; the organic layer is released, and the toluene is evaporated, and the liquid paraffin is dried with industrial sodium hydroxide until the water content is less than 0.5%, and it is ready for reuse.

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PUM

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Abstract

The invention relates to a treatment method for excess sodium sand in chemical reactions. The invention discloses a method for deactivating active sodium sand. Under the protection of inert gas, liquid paraffin is added to the active sodium system to be treated, and water is added to directly deactivate the active sodium. After deactivation, layers are separated, and the water layer is neutralized and then discharged. The liquid paraffin used in the present invention is common industrial liquid paraffin, which has a high boiling point and is not prone to bumping; it has a large specific heat and is a good dispersion medium, which can effectively disperse active sodium and isolate it from the air; the amount of liquid paraffin is reasonable, Moreover, it can be recycled, and the cost is low; the operation is simple and safe; after the treatment, the water layer can be directly discharged, which is environmentally friendly, and the liquid paraffin is recycled for reuse. Effect.

Description

Technical field: [0001] The invention relates to a treatment method for excess sodium sand in chemical reactions. Background technique: [0002] Sodium is a commonly used raw material in the chemical industry and can be used to carry out many types of reactions. Sodium is prone to spontaneous combustion in air, and it will react violently with water to release hydrogen gas and even burn. However, sodium is often an excessive substance in the reaction, so how to deal with the excess active sodium in the reaction kettle residue is the most important safety issue in most reactions using sodium. The existing method for quenching this type of active sodium is usually to react with isopropanol or ethanol and sodium to generate sodium alkoxide under the condition of nitrogen protection, and after the reaction is completed, add water to react with the generated sodium alkoxide to generate sodium hydroxide and alcohol. The advantage of this process is that the reaction in the whol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/00C01D1/44
Inventor 李晓李艳蔡忠生王秀玲郑烈
Owner 大连双硼医药化工有限公司
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