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Method for decolorization of pyroligneous liquor and preparation of calcium magnesium acetate based on catalytic ozonation

A technology of calcium magnesium acetate and ozone oxidation, applied in magnesium oxide, chemical instruments and methods, calcium/strontium/barium oxide/hydroxide, etc., can solve the problem of high cost, achieve high comprehensive utilization rate, and shorten decolorization The effect of simple time and production process

Active Publication Date: 2019-04-05
CHINA CATALYST HLDG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But decolorization this link in the deicing agent process of wood vinegar production, adopts active carbon decolorization method (CN203474707U) usually, the weak point of this mode is that cost is higher

Method used

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  • Method for decolorization of pyroligneous liquor and preparation of calcium magnesium acetate based on catalytic ozonation
  • Method for decolorization of pyroligneous liquor and preparation of calcium magnesium acetate based on catalytic ozonation
  • Method for decolorization of pyroligneous liquor and preparation of calcium magnesium acetate based on catalytic ozonation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Add calcium oxide to the wood vinegar, stir evenly at room temperature, and react for 1.5 hours to make the pH value 7.5. The insolubles were removed by filtration to obtain a dark brown wood vinegar conversion solution. Add 1g of calcium oxide (corresponding to 4g / L) to 250mL of wood vinegar conversion liquid, and stir, and measure its pH value to be 9.5. Pass into ozone to the wood vinegar conversion liquid that obtains above, it is the ozone and the oxygen mixed gas that the ozone generator produces, wherein O 3 Concentration is 90mg / L, and flow velocity is 200mL / min, and this mixed gas continuously bubbles into wood vinegar conversion liquid through the porous glass membrane at the bottom of the reactor. With the prolongation of ozone time, the color of wood vinegar conversion solution gradually changed from dark brown to light yellow or nearly colorless. figure 1 It is a photograph diagram of the degradation effect of the wood vinegar liquid conversion solution o...

Embodiment 2

[0027] Add magnesium oxide to the wood vinegar, stir evenly at room temperature, and react for 2 hours to make the pH value 8.0. The insolubles were removed by filtration to obtain a dark brown wood vinegar conversion solution. Add 2g of magnesium oxide (equivalent to 8g / L) to 250mL of wood vinegar conversion solution, and stir, and measure its pH to be 10.0. Pass into ozone to the wood vinegar conversion liquid that obtains above, it is the ozone and the oxygen mixed gas that the ozone generator produces, wherein O 3 Concentration is 100mg / L, and flow velocity is 500mL / min, and this mixed gas is continuously bubbled into wood vinegar conversion liquid through the porous glass membrane at the bottom of the reactor. After 4 hours of reaction, the decolorization was completed, and the pH value of the wood vinegar conversion solution was tested to be 7.8, which was close to neutral. The magnesium acetate aqueous solution was directly obtained by suction filtration, and the nearl...

Embodiment 3

[0029] Add calcium hydroxide to the wood vinegar, stir evenly at room temperature, and react for 1 hour to make the pH value 7.0. The insolubles were removed by filtration to obtain a dark brown wood vinegar conversion liquid. Add 2.5g of calcium hydroxide (equivalent to 10g / L) to 250mL of wood vinegar conversion liquid, and stir, and measure its pH value to be 10.8. Pass into ozone to the wood vinegar conversion liquid that obtains above, it is the ozone and the oxygen mixed gas that the ozone generator produces, wherein O 3 The concentration is 90mg / L, and it is continuously bubbled into the wood vinegar conversion liquid through the porous glass membrane at the bottom of the reactor at a flow rate of 400mL / min. After 3 hours of reaction, the pH value of the wood vinegar conversion liquid is 7.5, close to Neutral, directly obtain calcium acetate brine solution by suction filtration, and further obtain nearly white calcium acetate solid powder by spray drying. The solid pre...

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Abstract

Disclosed is a method for decolorization of pyroligneous liquor and preparation of calcium magnesium acetate based on catalytic ozonation. The method mainly includes (1), adding solid bases which comprise calcium or magnesium oxides and hydroxides in pyroligneous liquor, and reacting at the room temperature for 1-2 hours while keeping the pH value within 7-8; (2), filtering to extract dark-brown pyroligneous liquor transfer solution; (3), adding the same solid bases as the step (1) in the dark-brown pyroligneous liquor transfer solution by the volume of 1-10g / L,while keeping the pH valve to be8-11; (4), introducing ozone to the treated pyroligneous liquor transfer solution obtained in the step (3), reacting for 3-5 hours, with the concentration of O3 being 90-120mg / L and the flow rate being 200-1000mL / min; (5), after decolorization, regulating the pH value of the pyroligneous liquor transfer solution to be similar to neutral, performing suction filtration to extract low-carbon calciummagnesium carboxylate solution, and atomizing the low-carbon calcium magnesium carboxylate solution; (6), calcining solid precipitates filtered out in the step (5) at the temperature of 800 DEG C. The method is simple in process, low in cost, short in time for decolorization and high in comprehensive utilization rate, and is energysaving, efficient and free of secondary pollution.

Description

technical field [0001] The invention relates to a method for decolorizing wood vinegar. Background technique [0002] Using the waste liquid (wood vinegar liquid) produced during the gasification and dry distillation of biomass waste (wheat straw, wood chips, etc.) Calcium magnesium salt (CMA) plant-based compound deicing agent. The production of CMA-type environmentally friendly deicing agent from biomass waste liquid can not only provide an economical and feasible environmental protection deicing agent for road deicing and eradicating the chlorine damage of deicing agent, but also provide a change for the treatment of this kind of biomass waste liquid. A new way to turn waste into wealth. However, during the decolorization process of wood vinegar production of deicing agent, activated carbon decolorization (CN203474707U) is usually used. The disadvantage of this method is that the cost is relatively high. Contents of the invention [0003] The purpose of the present i...

Claims

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Application Information

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IPC IPC(8): B01J8/08C01F11/04C01F5/06C09K3/18
CPCB01J8/08C09K3/18C01F5/06C01F11/04
Inventor 宋朝霞许英梅朱骏
Owner CHINA CATALYST HLDG CO LTD
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