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A 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 reducing the load of biochemical treatment

Active Publication Date: 2021-04-02
HANDAN COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 good for anaerobic and good in the biochemical treatment system. Oxygen sludge has an inhibitory effect, and rosin production wastewater is usually difficult to treat, and cannot be discharged up to standard through traditional anaerobic and aerobic processes

Method used

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  • A method for recovering tannic acid from rosin production wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Put the rosin production waste water into the container, and carry out the float method aeration and degreasing with the air-water ratio of 3:1;

[0029] (2) Add hydrochloric acid in the waste water after degreasing, adjust its pH to be 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 filter after flocculation;

[0031] (4) the filtrate after the flocculation treatment and the dimethylheptyl methylphosphonate extractant carry out the multistage countercurrent extraction that the total number of stages is 6 to reclaim tannic acid, the volume ratio of dimethylheptyl methylphosphonate and waste water The ratio is 1:1, and after extraction, an extract containing 10g / L of tannic acid is obtained;

[0032] (5) the extract that step (4) obtains contains tannic acid and the NaOH solution that mass concentration is 20% carries out total number of stages and is 6 grades of m...

Embodiment 2

[0037] According to the method for reclaiming tannic acid from the rosin production wastewater described in Example 1, changing the addition of sodium alginate to the wastewater is 1g / L, and all the other process conditions are constant, and the recovery of the tannic acid product with a purity of 80%.

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 and wastewater is changed to 1:3, and the rest of the process conditions are 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 waste water treatment process, in particular to a treatment process for recovering tannic acid from rosin production waste water. Background technique [0002] Tannins can be divided into hydrolyzed tannins and condensed tannins, and hydrolyzed tannins can be further divided into gallotannins and ellagitannins according to the hydrolyzed products. The most typical gallic tannin is gallic tannin, which is abundant in other raw materials such as gallnut and tara. The molecular formula of tannic acid is C 76 h 52 o 46 , is an esterified compound consisting of 8 gallic acid units and 1 glucose unit. [0003] Tannic acid belongs to fulvic acid in natural organic hydrophobic neutral substances. Its own polyphenol structure can form chlorophenols in the presence of chlorine, which makes the water body produce a strong and unpleasant pungent smell. Because tannic acid has a loose polymer structure, as well as a large number of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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