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Regenerable dicyandiamide modified tannin adsorbent as well as preparation method and production system thereof

A dicyandiamide and adsorbent technology, applied in the field of renewable dicyandiamide modified tannin adsorbent and its preparation, can solve the problems of high preparation cost, easy pollution, and inability to control the particle size and shape. problem, to achieve the effect of good consistency and uniform particle size

Active Publication Date: 2018-12-28
JINGCHU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some researchers modified tannin to load small molecules containing nitrogen or sulfur groups on the surface, such as dimethylamine, dithiourea, N-aminoguanidine, etc., to improve its ability to adsorb precious metals, but such modification methods are often Using reagents such as paraformaldehyde or concentrated acid, and high temperature reaction conditions are required, the preparation cost is high and pollution is easy to occur
The existing research and technology mainly consider high adsorption capacity and strong selectivity in the preparation of adsorbents, but cannot achieve controllable particle size and shape, and there is no batch preparation process

Method used

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  • Regenerable dicyandiamide modified tannin adsorbent as well as preparation method and production system thereof
  • Regenerable dicyandiamide modified tannin adsorbent as well as preparation method and production system thereof
  • Regenerable dicyandiamide modified tannin adsorbent as well as preparation method and production system thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A renewable dicyandiamide modified tannin adsorbent, and its preparation method is as follows:

[0021] Pump the tannin solution in the first storage tank and the ammonia water in the second storage tank into the reactor in turn, stir and mix evenly, pump the formaldehyde solution in the third storage tank into the reactor at a stirring speed of 40r / min, the reaction temperature is 40 ℃ for 2h, and then the dicyandiamide solution in the fourth storage tank (the substances of tannin, ammonia, formaldehyde, dicyandiamide in the above reaction The ratio of the amount is 20:5:1:1) is added dropwise to the reaction kettle, and reacts for 2h at a stirring speed of 40r / min and a reaction temperature of 40℃. After the reaction, the material is pumped into the thickener for concentration Crystallization and concentration crystallization temperature is 20℃, the upper overflow clear liquid after concentrated crystallization is pumped into the reactor, the lower crystal slurry after ...

Embodiment 2

[0030] A renewable dicyandiamide modified tannin adsorbent, and its preparation method is as follows:

[0031] Pump the tannin solution in the first storage tank and the ammonia water in the second storage tank into the reactor in turn, stir and mix evenly, pump the formaldehyde solution in the third storage tank into the reactor at a stirring speed of 200r / min, the reaction temperature is 60℃ for 3.5h, and then the dicyandiamide solution in the fourth storage tank (the substances of tannin, ammonia, formaldehyde, dicyandiamide in the above reaction The ratio of the amount is 27:5.5:1.3:1.1) is added dropwise to the reaction kettle, and reacts for 3h at a stirring speed of 200r / min and a reaction temperature of 60℃. After the reaction, the materials are pumped into the thickener Concentrate crystals, the temperature of concentrated crystallization is 30℃, the upper overflow clear liquid after concentrated crystallization is pumped into the reactor, the lower crystal slurry after...

Embodiment 3

[0039] A renewable dicyandiamide modified tannin adsorbent, and its preparation method is as follows:

[0040] Pump the tannin solution in the first storage tank and the ammonia in the second storage tank into the reactor in turn, stir and mix evenly, pump the formaldehyde solution in the third storage tank into the reactor at a stirring speed of 300r / min, the reaction temperature is 85℃ for 5h, and then the dicyandiamide solution in the fourth storage tank is dropped at a dropping rate of 0.5L / min (the substances of tannin, ammonia, formaldehyde and dicyandiamide in the above reaction) The ratio of the amount is 35:6:1.5:1.2) was added to the reaction kettle, and reacted for 5h at a stirring speed of 300r / min and a reaction temperature of 85°C. After the reaction, the material was pumped into the thickener for concentration Crystallization and concentration crystallization temperature is 40℃, the upper overflow clear liquid after concentrated crystallization is pumped into the ...

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Abstract

The invention relates to a regenerable dicyandiamide modified tannin adsorbent as well as a preparation method and a production system thereof. The regenerable dicyandiamide modified tannin adsorbenthas the structural formula shown in the description. In the provided preparation method, the regenerable dicyandiamide modified tannin adsorbent with uniform grain size and good consistency is obtained by optimizing the reaction stirring speed and the dropwise adding speed of dicyandiamide. The adsorption quantity of the regenerable dicyandiamide modified tannin adsorbent for Co and Ni in the pH range of 3.5-7.5 reaches 70 mg / g or above, is increased by 60% or above as compared with that of existing tannin adsorbents and is 2-5 times or above that of other bio-adsorbents.

Description

Technical field [0001] The invention relates to the technical field of materials, in particular to a renewable dicyandiamide modified tannin adsorbent and a preparation method and production system thereof. Background technique [0002] Plant tannins are rich in sources, low in cost, rich in phenolic hydroxyl groups, and easy to modify. They are a kind of biosorption material with broad application prospects. Tannin can be dissolved in water, so it needs to be prepared as a water-insoluble absorbent before it can be used. At present, tannin-containing adsorbents are roughly divided into four types: tannin phenolic resin, modified tannin resin, grafted polymer substrate cured tannin, and tannin foam. In 1993, Nakajima et al. reported for the first time that formaldehyde and persimmon tannin were cross-linked and solidified under the catalysis of sodium hydroxide to prepare an adsorbent, which can efficiently adsorb Au(III) in aqueous chloroauric acid. Some researchers modified t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30B01J19/18C02F1/28C02F101/20C02F101/22
CPCB01J19/18B01J20/24B01J20/30C02F1/286C02F2101/20C02F2101/22
Inventor 易庆平苏陶贵李居宁王劲松朱德艳
Owner JINGCHU UNIV OF TECH