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Recycling method for pyridoxal manganese-containing wastewater

A technology for pyridoxal and waste water, which is applied to the improvement of process efficiency, organic chemistry, etc., can solve the problems of reduced yield of Schiff base, rising cost, poor quality of manganese carbonate, etc. good quality effect

Active Publication Date: 2018-11-06
江苏香地化学有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, we have found through research that there are still many defects in this method that can be further improved. For example, when the manganese-containing wastewater obtained by filtration is prepared into manganese carbonate precipitation, because p-aminophenethyl ether and pyridoxal Schiff base have a negative effect on manganese Ions have complex adsorption, resulting in poor quality of manganese carbonate generated, in order to achieve industrial utilization, manganese carbonate needs to be washed with a large amount of water, which has resulted in the generation of a large amount of waste water, and also increases the cost of waste water treatment; and, for amino The complex adsorption of phenetole and pyridoxal Schiff bases on manganese ions also led to a decrease in the yield of Schiff bases

Method used

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  • Recycling method for pyridoxal manganese-containing wastewater
  • Recycling method for pyridoxal manganese-containing wastewater
  • Recycling method for pyridoxal manganese-containing wastewater

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Experimental program
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Effect test

Embodiment 1

[0036] Specific steps are as follows:

[0037] (1) take water as reaction solvent, manganese dioxide (30g) is as oxygenant, and raw material pyridoxine (40g) is oxidized into pyridoxal, obtains manganese-containing pyridoxal solution;

[0038] (2) Add 500mL manganese-containing pyridoxal solution in a clean flask of 1000mL, suction filter the manganese-containing pyridoxal solution, obtain manganese-containing pyridoxal filtrate and solid manganese dioxide, and collect and reuse the solid manganese dioxide ;

[0039] (3) Manganese-containing pyridoxal is cooled to 35 DEG C, and slowly adding concentration is respectively 5%, 10%, 15%, 20% Na in the manganese-containing pyridoxal filtrate. 2 CO 3 Solution, adjust the pH to 7, after reacting for 30min, produce white manganese carbonate precipitate, separate manganese carbonate solid and pyridoxal solution by suction filtration;

[0040] (4) Pyridoxal solution is continued to react with p-aminophenethyl ether to generate a Sch...

Embodiment 2

[0045] Specific steps are as follows:

[0046] (1) take water as reaction solvent, manganese dioxide (30g) is as oxygenant, and raw material pyridoxine (40g) is oxidized into pyridoxal, obtains manganese-containing pyridoxal solution;

[0047] (2) Add 500mL manganese-containing pyridoxal solution in a clean flask of 1000mL, suction filter the manganese-containing pyridoxal solution, obtain manganese-containing pyridoxal filtrate and solid manganese dioxide, and collect and reuse the solid manganese dioxide ;

[0048] (3) Manganese-containing pyridoxal is cooled to 35 DEG C, and slowly adding concentration is 15% Na in the manganese-containing pyridoxal filtrate. 2 CO 3 Solution, adjust the pH to 5, 6, 7, 8, 9, 10 respectively, after reacting for 30min, produce white manganese carbonate precipitate, separate manganese carbonate solid and pyridoxal solution by suction filtration;

[0049] (4) Pyridoxal solution is continued to react with p-aminophenethyl ether to generate a Sch...

Embodiment 3

[0054] Specific steps are as follows:

[0055] (1) take water as reaction solvent, manganese dioxide (30g) is as oxygenant, and raw material pyridoxine (40g) is oxidized into pyridoxal, obtains manganese-containing pyridoxal solution;

[0056] (2) Add 500mL manganese-containing pyridoxal solution in a clean flask of 1000mL, suction filter the manganese-containing pyridoxal solution, obtain manganese-containing pyridoxal filtrate and solid manganese dioxide, and collect and reuse the solid manganese dioxide ;

[0057] (3) Manganese-containing pyridoxal is cooled to 35 DEG C, and slowly adding concentration is 15% NaHCO in the manganese-containing pyridoxal filtrate 3 solution, adjust the pH to 8, and react for 10, 15, 20, 25, and 30 minutes respectively to produce white manganese carbonate precipitate, and separate the manganese carbonate solid and pyridoxal solution by suction filtration;

[0058] (4) Pyridoxal solution is continued to react with p-aminophenethyl ether to ge...

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Abstract

The invention discloses a recycling method for pyridoxal manganese-containing wastewater and belongs to the technical field of wastewater treatment. The method includes the steps that manganese-containing pyridoxal filtrate with manganese dioxide filtered out after filtering and a sodium carbonate solution or a sodium bicarbonate solution are subjected to a first-time reaction, then filtering is performed, and a pyridoxal solution and manganese carbonate solids are obtained; filtering is performed after the pyridoxal solution and p-phenetidine are subjected to a second-time reaction, and Schiff base solids and filtrate are obtained; and finally, the filtrate is filtered, and NaCL solids and recycled water are obtained. By utilizing the method, the concentration of Mn2+ in the pyridoxal manganese-containing wastewater can be effectively lowered to 0.5 mg / L, the manganese removing rate is increased to 95%, and the Schiff base yield is increased to 90%; and besides, the purity of manganese carbonate recycled through the method reaches up to 90%, and quality is good.

Description

technical field [0001] The invention relates to a method for recycling pyridoxal manganese-containing wastewater, which belongs to the technical field of wastewater treatment. Background technique [0002] Schiff base is a kind of relatively stable imine with an alkyl or aryl group attached to the nitrogen atom. It has excellent liquid crystal properties. Schiff base compounds and their metal complexes are used in medicine, catalysis, analytical chemistry, corrosion and Important applications in the field of photochromism. In the field of medicine, Schiff bases have biological activities of antibacterial, bactericidal, antitumor, and antiviral; in the field of catalysis, cobalt and nickel complexes of Schiff bases have been used as catalysts; in the field of analysis, Schiff bases are used as good Ligands can be used to identify and identify metal ions and quantitatively analyze the content of metal ions; in the field of corrosion, some aromatic Schiff bases are often used ...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B47/00C07D213/66
CPCC07D213/66C22B7/006C22B47/00Y02P10/20
Inventor 林伟蔡琦张玮琪于广陈礼伟
Owner 江苏香地化学有限公司
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