A kind of treatment method of piperonal production wastewater

A technology for the production of wastewater and treatment methods, which is applied in the fields of energy wastewater treatment, natural water treatment, water/sewage multi-stage treatment, etc. It can solve the problems of unrecoverable piperonal products, secondary pollution, etc., and achieve enhanced removal effect and simplified treatment. Effect of technology, high economic effect and environmental benefit

Active Publication Date: 2022-07-12
HEBEI HAILI FRAGRANCES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem that the existing method for treating waste water from piperonal production cannot recycle the reaction raw materials and piperonal products, and will cause secondary pollution, the present invention provides a treatment method for waste water from piperonal production, which mainly uses piperonal Add 1,2-methylenedioxybenzene to the production wastewater to form an azeotropic system, recover the piperonal in the wastewater, and add a catalyst to the wastewater after the recovery of piperonal for high-voltage pulse treatment, so that the wastewater can meet the discharge standard, which not only realizes It ensures the effective recovery of raw materials and products in wastewater, and will not cause secondary pollution, and has high economic and environmental benefits

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The present embodiment provides a treatment method for piperonal production wastewater, comprising the following steps:

[0037] Step a, take 1000g of piperonal production wastewater and add it to the still, add 10g of 1,2-methylenedioxybenzene, under stirring conditions, carry out distillation at normal pressure of 101°C, collect 54.3g of fractions, stop the distillation, and separate the fractions into liquids. , 13.8 g of oil phase was obtained, and detected by high performance liquid chromatography, the content of piperonyl ring was 79.7%, the content of piperonal aldehyde was 15.4%, and the content of intermediate was 3.6%;

[0038] In step b, the remaining mother liquor from the distillation is lowered to room temperature, the pH is adjusted to 4.2 with 30wt% hydrochloric acid, 1 g of nano titanium dioxide powder with a particle size of 20nm is added, and then high-voltage pulse treatment is performed. The discharge voltage of the high-voltage pulse is 650V, the fr...

Embodiment 2

[0042] The present embodiment provides a treatment method for piperonal production wastewater, comprising the following steps:

[0043]Step a, take 1000g of piperonal production wastewater and add it to the still, add 20g of 1,2-methylenedioxybenzene, under stirring conditions, carry out distillation at normal pressure of 102°C, collect 98.5g of fraction, stop distillation, and divide the fraction into liquid. , to obtain 23.6 g of oil phase, and detected by high performance liquid chromatography, the content of piperonyl ring is 88.1%, the content of piperonal aldehyde is 9.3%, and the content of intermediate is 2.1%;

[0044] In step b, the remaining mother liquor from the distillation is lowered to room temperature, the pH is adjusted to 4.9 with 30wt% hydrochloric acid, 1 g of nano titanium dioxide powder with a particle size of 10 nm is added, and then high-voltage pulse treatment is performed. The discharge voltage of the high-voltage pulse is 900V, the frequency is 5000H...

Embodiment 3

[0048] The present embodiment provides a treatment method for piperonal production wastewater, comprising the following steps:

[0049] Step a, take 1000g of piperonal production wastewater and add it to the still, add 15g of 1,2-methylenedioxybenzene, under stirring conditions, carry out distillation at normal pressure of 103 ° C, collect 85g of fractions, stop the distillation, and separate the fractions into liquids, Obtained oil phase 18.7g, detected by high performance liquid chromatography, piperonyl ring content 85.7%, piperonal content 11.6%, intermediate content 2.5%;

[0050] In step b, the remaining mother liquor from the distillation is lowered to room temperature, the pH is adjusted to 4.1 with 30wt% hydrochloric acid, 0.6 g of nano titanium dioxide powder with a particle size of 10 nm is added, and then high-voltage pulse treatment is performed. The discharge voltage of the high-voltage pulse is 800V, the frequency is 8000Hz, and the The empty ratio is 40%, the p...

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Abstract

The invention relates to the technical field of industrial wastewater treatment, and specifically discloses a treatment method for piperonal production wastewater. The method for treating the piperonal production wastewater includes: adding 1,2-methylenedioxybenzene to the piperonal production wastewater, mixing uniformly, performing distillation, collecting fractions, and separating liquids to obtain recovered materials; cooling the remaining mother liquor from the distillation , After adjusting the pH to weak acidity, adding transition metal oxides, performing high-pressure pulse treatment, filtering, and treating the treated water through the sewage treatment system and discharging. The method for treating wastewater from piperonal production provided by the invention has the advantages of simple process operation and low energy consumption, and solves the problem that the reaction raw materials and reaction products in the wastewater cannot be recovered by the traditional treatment process, and the treated wastewater can reach the level of "Chemical Synthesis Pharmaceutical Industry" "Water Pollutant Discharge Standard" discharge standard, will not cause secondary pollution, realize the comprehensive treatment and resource utilization of wastewater, has high economic and environmental benefits, and has high promotion value.

Description

technical field [0001] The invention relates to the technical field of industrial wastewater treatment, in particular to a method for treating wastewater from piperonal production. Background technique [0002] Piperonal, chemical name is 3,4-methylenedioxybenzaldehyde, molecular formula is C 8 H 6 O 3 , white to light yellow crystals, soluble in general organic solvents, insoluble in water and glycerol, melting point is 35~37℃, boiling point is 261~263℃. Piperonal not only has a sweet heliotrope aroma, but also has a light and slightly sweet aroma of cherry and sunflower, and also has a weak spicy aroma, which lasts for a long time. It is one of the most important synthetic spices in the world and is widely used in various Fragrance blending. [0003] Piperonal is prepared from 1,2-methylenedioxybenzene (piperonyl ring) through acidification and catalytic oxidation. During the catalytic oxidation process, wastewater containing benzene ring substances will be produced. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F101/30C02F103/36
CPCC02F9/00C02F1/04C02F1/001C02F1/66C02F2101/30C02F3/30C02F2103/36Y02W10/37
Inventor 张云堂邵帅朱玉梅王飞扬王晶晓邢孟平
Owner HEBEI HAILI FRAGRANCES CO LTD
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