Method for recovering tannic acid from rosin production wastewater

A technology for the production of wastewater and tannic acid, which is applied in the direction of chemical instruments and methods, sugar derivatives, sugar derivatives, etc., can solve the problems of rosin production wastewater that is difficult to treat and cannot meet the discharge standards, so as to improve biodegradability and reduce treatment Difficulty, the effect of efficient recycling

Active Publication Date: 2018-10-16
HANDAN COLLEGE
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Problems solved by technology

With the mass production of rosin, a large amount of waste water will inevitably be produced. These waste waters contain various organic matter such as tannic acid, resin acid, phenols, etc., because the water solubility of tannic acid is strong, it is goo

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  • Method for recovering tannic acid from rosin production wastewater

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Effect test

Embodiment 1

[0028] (1) Put the rosin production wastewater into a container, and carry out floating aeration and degreasing with an air-water ratio of 3:1;

[0029] (2) Add hydrochloric acid to the degreasing wastewater to adjust its pH to 5;

[0030] (3) Add sodium alginate flocculant to the wastewater after pH adjustment, the addition amount is 3g / L, the flocculation time is 10min, and then filter after flocculation;

[0031] (4) The filtrate after the flocculation treatment and the dimethylheptyl methylphosphonate extractant are subjected to multi-stage countercurrent extraction with a total of 6 stages to recover tannic acid, the volume ratio of dimethylheptyl methylphosphonate to wastewater 1:1, after extraction, an extract containing 10g / L of tannic acid mass is obtained;

[0032] (5) The tannic acid-containing extract obtained in step (4) and the NaOH solution with a mass concentration of 20% are subjected to a 6-stage multi-stage countercurrent back extraction treatment, and the volume ra...

Embodiment 2

[0037] According to the method for recovering tannic acid from rosin production wastewater described in Example 1, the addition amount of sodium alginate in the wastewater was changed to 1 g / L, and the remaining process conditions remained unchanged, and a tannic acid product with a purity of 80% was recovered.

Embodiment 3

[0039] According to the method for recovering tannic acid from rosin production wastewater described in Example 1, the volume ratio of dimethylheptyl methylphosphonate to wastewater was changed to 1:3, and the rest of the process conditions remained unchanged to obtain tannic acid with a purity of 76%. product.

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Abstract

The invention discloses a method for recovering tannic acid from rosin production wastewater. Multistage extraction and multistage back extraction methods are adopted for recovering tannic acid from the rosin production wastewater. The method comprises the following steps: firstly, removing oil from the wastewater in an up-float manner; adjusting the pH of the wastewater to 1 to 6; then, adding asodium alginate flocculant to flocculate the wastewater; filtering and performing multi-stage counter-current extraction on filtrate by using di(octan-2-yl)methylphosphonate; performing multi-stage counter-current back extraction treatment on extraction liquid loaded with tannic acid with a NaOH solution; lastly, purifying, concentrating and drying a strip liquor to obtain industrial tannic acid,wherein tannic acid is 75 to 82 percent in purity. By adopting the method, tannic acid is recovered, the biodegradability of the wastewater is improved, and the subsequent biochemical treatment difficulty is lowered.

Description

Technical field [0001] The invention relates to a wastewater treatment process, in particular to a process for recovering tannic acid from rosin production wastewater. Background technique [0002] Tannins can be divided into hydrolyzed tannins and condensed tannins, and hydrolyzed tannins can be divided into gallic tannins and ellagic tannins according to the hydrolyzed products. The most typical gallic tannin is gallic tannin, which is rich in other raw materials such as gallic, tara. The molecular formula of tannin is C 76 H 52 O 46 , Is an ester compound composed of 8 gallic acid units and 1 glucose unit. [0003] Tannic acid belongs to fulvic acid in the hydrophobic neutral substance of natural organic matter. Its own polyphenol structure, in the presence of chlorine, can form chlorophenols, causing the water body to produce a strong, unpleasant irritating smell. Because tannic acid has a loose polymer structure, a large number of functional groups and adsorption complexing...

Claims

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Application Information

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IPC IPC(8): C02F9/10C07H1/06C07H13/08C02F103/38
CPCC02F1/001C02F1/04C02F1/12C02F1/22C02F1/24C02F1/26C02F1/40C02F1/54C02F1/66C02F9/00C02F2103/38C02F2301/08C07H1/06C07H13/08
Inventor 吴运东王磊张睿谢全森
Owner HANDAN COLLEGE
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