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Method for recovering sodium bicarbonate and organic acid sodium salt from cyclohexanone waste alkali solution

A technology of organic sodium salt and sodium bicarbonate, applied in bicarbonate preparation, carboxylate preparation and other directions, can solve the problems of cumbersome process flow, difficult separation of solid and liquid, high processing energy consumption, and achieves short process flow and additional The effect of high value and low energy consumption

Inactive Publication Date: 2013-01-16
赵志军
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  • Abstract
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  • Claims
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Problems solved by technology

"This patented method also has disadvantages such as difficult separation of solid and liquid, high energy consumption for processing, cumbersome process flow, and difficulty in industrialization.

Method used

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  • Method for recovering sodium bicarbonate and organic acid sodium salt from cyclohexanone waste alkali solution

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Experimental program
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Effect test

Embodiment 1

[0025] Embodiment one: extract crude product sodium bicarbonate, crude product organic acid sodium salt from waste lye.

[0026] From the cyclohexanone device, take volume and be 810ml of waste lye 1Kg, in 5000ml three-necked flask, waste lye and carbon dioxide gas generation carbonation reaction, record the pH value of reaction solution when being 8.3, stop reaction; The reaction solution was precipitated and layered. After a period of time, solid-liquid two-phase appeared in the flask, the upper layer was clear liquid, and the lower layer was thick slurry; put 500ml of supernatant into a 1000ml three-necked flask by siphon method, and open Water ring vacuum pump, keep the vacuum pressure in the three-neck flask at 60Kpa, collect condensed water, stop evaporation when the volume of condensed water reaches 250ml; put the evaporated residue into a crucible, heat it to 110°C in a muffle furnace, 380 g of crude organic acid sodium salt were obtained; the thick slurry was then pla...

Embodiment 2

[0027] Embodiment 2: extract crude product organic acid sodium salt from waste lye.

[0028] From the cyclohexanone device, get volume and be 810ml waste lye 1Kg, in 5000ml three-neck flask, waste lye and carbon dioxide gas generation carbonation reaction, record the pH value of reaction solution when being 8.5, stop reaction; The reaction solution was precipitated and layered. After a period of time, solid-liquid two-phase appeared in the flask, the upper layer was clear liquid, and the lower layer was thick slurry; put 500ml of supernatant into a 1000ml three-necked flask by siphon method, and open Water ring vacuum pump, keep the vacuum pressure in the three-necked flask at 60Kpa, collect condensed water, stop evaporation when the volume of condensed water reaches 250ml, put the evaporated residue into a 5000ml three-necked flask with thick slurry, and stir After mixing evenly, put it into a crucible and heat to 110° C. in a muffle furnace to obtain 550 g of crude organic a...

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Abstract

The invention provides a method for recovering sodium bicarbonate and organic acid sodium salt from a cyclohexanone waste alkali solution. The method comprises the following steps of: performing gas-liquid contact carbonation reaction on CO2 and the waste alkali solution, precipitating and demixing to obtain clear liquid and concentrated sodium bicarbonate slurry; concentrating and sectioning the concentrated slurry to obtain a crude sodium bicarbonate; and evaporating, concentrating and sectioning the clear liquid to obtain crude organic acid sodium salt, or stirring and mixing raffinate obtained after the clear liquid is evaporated and the concentrated slurry, concentrating and sectioning to obtain the crude organic acid sodium salt. By the method, available resources in the cyclohexanone waste alkali solution are recovered, so that inorganic or organic chemical products such as the sodium bicarbonate and the organic acid sodium salt are obtained, and secondary pollutants are not discharged in the recovering process. Compared with the prior art, the method has the advantages that the whole technological process is short and low in energy consumption, equipment investment and running cost, the added value of the obtained recycled products is high, and social and economic benefits are obvious.

Description

technical field [0001] The invention relates to the comprehensive utilization technology of chemical wastewater, in particular to a method for recovering sodium bicarbonate and organic acid sodium salt from cyclohexanone waste lye Background technique [0002] Cyclohexanone is an important chemical raw material. The industrial production of cyclohexanone mostly adopts cyclohexane liquid phase oxidation process. This process produces cyclohexanone, and the selectivity of alcohol and ketone products is generally 75% to 85%, and the remaining part is converted into by-products, of which light oil and X oil can be directly recovered, and the remaining components must be treated by alkali washing, and finally Form cyclohexanone high-concentration waste lye (hereinafter referred to as waste lye). A set of 50,000 tons / year cyclohexanone production plant discharges about 40,000 to 60,000 tons of waste lye each year. The waste lye mainly includes sodium hydroxide, sodium carbonate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D7/10C07C51/41
Inventor 赵志军
Owner 赵志军
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