Preparation method of mercapto functionalized lignin microspheres

A lignin, functionalized technology, applied in chemical instruments and methods, other chemical processes, water/sludge/sewage treatment, etc., can solve the problem of uneven particle size of lignin microspheres, lack of effective functional groups, The problem of poor controllability of morphology, etc., achieves good industrial application prospects, uniform particle size, and low cost.

Active Publication Date: 2017-05-10
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a preparation method of mercapto-functionalized lignin microspheres, so as to overcome the complex process of preparing lignin microspheres, and the prepared lignin microspheres have uneven particle size, wide distribution, and lack of effective functional groups, poor shape controllability, poor adsorption effect, etc.

Method used

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  • Preparation method of mercapto functionalized lignin microspheres

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Embodiment 1

[0028] A preparation method of mercapto-functionalized lignin microspheres, comprising the following steps:

[0029] (1) Construct the oil-in-water-in-oil double emulsion droplet system by microchannel reactor (this microchannel reactor is the focused flow microchannel reactor): comprise the following steps:

[0030] a. dissolving ethylene dichloride in sherwood oil to prepare an organic solution with a mass fraction of 10%, while adding 3% catalyst aluminum chloride as the internal phase;

[0031] b. Add ethanol lignin to water to prepare an aqueous solution with a solid content of 16%, and add 5% emulsifier and 6% regulator sodium carboxymethylcellulose. The emulsifier is SDBS and OP-15, SDBS and OP-15 The mass ratio of the mixture is 1:1, and the mixture is evenly used as the intermediate phase;

[0032] c. Add surfactants Tween80 and Span60 (the mass ratio of Tween80 and Span60 is 2:1) into dodecane, and prepare an organic solution containing surfactant mass percentage co...

Embodiment 2

[0038] A preparation method of mercapto-functionalized lignin microspheres, comprising the following steps:

[0039] (1) Construct the oil-in-water-in-oil double emulsion droplet system by microchannel reactor (this microchannel reactor is the focused flow microchannel reactor): comprise the following steps:

[0040]a. dissolving ethylene dichloride in benzene to prepare an organic solution with a mass fraction of 15%, while adding 4% catalyst aluminum chloride as the internal phase;

[0041] b. Add lignosulfonate to water to prepare an aqueous solution with a solid content of 21%, and add 7% emulsifier and 7.5% regulator water-soluble starch. The emulsifier is SDS and OP-10, and SDS and OP-10 are mixed The ratio is 1:1, mixed evenly as the intermediate phase;

[0042] c. Add surfactants Span80 and Tween20 (the mixing ratio of Span80 and Tween20 is 1:1) into n-hexane, and prepare an organic solution containing a surfactant mass percentage concentration of 6.5% as the external...

Embodiment 3

[0048] A preparation method of mercapto-functionalized lignin microspheres, comprising the following steps:

[0049] (1) Construct the oil-in-water-in-oil double emulsion droplet system by microchannel reactor (this microchannel reactor is the focused flow microchannel reactor): comprise the following steps:

[0050] a. dissolving ethylene dichloride in ether is prepared as an organic solution with a mass fraction of 2%, while adding 1% catalyst aluminum chloride as the internal phase;

[0051] b. adding alkali lignin to water to prepare an aqueous solution with a solid content of 5%, and adding 1% emulsifier SDS and 2% regulator polyethylene glycol, and mixing uniformly as an intermediate phase;

[0052] c. adding the surfactant Span80 into the liquid paraffin, and preparing an organic solution containing a surfactant mass percentage concentration of 1% as the external phase;

[0053] d. Make the internal phase and the intermediate phase flow into the focused flow microchann...

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Abstract

The invention discloses a preparation method of mercapto functionalized lignin microspheres. The method comprises the following steps: (1) building an oil-in-water-in-oil double emulsion droplet system; (2) putting the double emulsion droplet system prepared in the step (1) into a thermal reactor, heating up to 55-95 DEG C, enabling an internal phase solvent to gradually volatilize, and enabling a product to carry out a crosslinking reaction with lignin in an intermediate phase under the catalytic action of a catalyst for 2-12h, so as to form monodisperse chlorinated lignin microspheres; (3) adding the monodisperse chlorinated lignin microspheres obtained in the step (2) into an ethanol solution of sodium hydrosulfide, carrying out a reaction for 2-10h at the temperature of 20-85 DEG C, then filtering a product, carrying out centrifugal separation, washing, and drying to obtain the monodisperse mercapto functionalized lignin microspheres. The mercapto functionalized lignin microspheres prepared by the preparation method have good mechanical property and can bear hydraulic impact; an introduced functional group, i.e., mercapto group has a remarkable adsorption effect on divalent heavy metal ions; the mercapto functionalized lignin microspheres are free from secondary pollution, can be recycled, and is environmentally-friendly and non-toxic.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a preparation method of mercapto-functionalized lignin microspheres. Background technique [0002] Industrial production often produces wastewater containing chromium, nickel, copper, zinc, cadmium, lead, gold, mercury, silver and other heavy metal ions, causing serious pollution to rivers, lakes and seas. Industrial wastewater containing heavy metal ions will cause serious pollution to surface water, groundwater and soil, and cannot be stable in the environment, accumulate in organisms, and easily enter the plant through the root system and be absorbed, inhibiting crop growth and development, and reducing yield , and further enter the human body through the transmission and enrichment of the food chain, causing canceration, deformity, etc., and seriously endangering human health. For example, the blood lead incident in Shuangfeng, Hunan in 2009, and the heavy metal ion pollu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/16C08J3/16C08H7/00B01J20/24C02F1/28B01J20/30C02F101/20C08L97/00
CPCB01J20/24B01J2220/4837C02F1/286C02F2101/20C08H6/00C08J3/16C08J7/16C08J2397/00
Inventor 李志礼葛圆圆黄文星
Owner GUANGXI UNIV
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