Preparation and curing method of sodium alginate-lignin composite gel beads

A technology of sodium alginate and curing method, applied in chemical instruments and methods, other chemical processes, inorganic chemistry, etc., can solve the problems of high price, pollute the environment, high toxicity, etc., and achieve low price, high lignin content, and toxicity. low effect

Pending Publication Date: 2020-04-03
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, using sodium lignosulfonate solution mixed with sodium alginate, one or more of formaldehyde, acetaldehyde, propionaldehyde, butyraldehyde, glutaraldehyde, adipaldehyde, dichloroethane, epichlorohydrin These cross-linking agents are expensive, highly toxic and pollute the environment
And the amount of sodium lignosulfonate in the beads is low, therefore, the utilization rate of lignin in the preparation process of the composite gel material needs to be further improved

Method used

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  • Preparation and curing method of sodium alginate-lignin composite gel beads
  • Preparation and curing method of sodium alginate-lignin composite gel beads
  • Preparation and curing method of sodium alginate-lignin composite gel beads

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] (1) Mixed reaction, prepare 1.5% (w / v) sodium alginate solution and 10% (w / v) alkali lignin glycol solution, first stir the sodium alginate solution in a water bath at 80°C for 45min, then press Sodium alginate and lignin mass ratio are the ratio of 2:1 (lignin content is 33.3wt% in the composite bead), lignin glycol solution is mixed with sodium alginate, mixed reaction is carried out under water bath, temperature is Stir at 40 °C for 30 min at 200 RPM.

[0061] (2) To prepare composite coagulation beads, use a 17G flat-tip syringe to drop the mixed solution into 100ml calcium chloride solution (100mmol / L) drop by drop to form coagulation beads, and let them stand for 12 hours to harden.

[0062] (3) Solidification treatment: Rinse the pod after standing and hardening for 12 hours with deionized water three times to remove unbound lignin and salt. Divide the beads into 5 parts on average, and air-dry the first part as the control group, marked as C1. The remaining 4 ...

Embodiment 2

[0068] As shown in Example 1, the difference is that in the mixing reaction step, sodium alginate and lignin are mixed in a mass ratio of 4:1 (the lignin content in the composite beads is 20wt%) to prepare composite beads, and then Coated and cured. image 3 It is a photo of the sodium alginate-lignin composite beads prepared by the preparation method of Example 2 before air-drying. It can be seen that the beads prepared by reducing the proportion of lignin are lighter in color. Figure 4 After 24 hours of natural air-drying, the beads of the control group C1 appeared collapsed and flat, while the beads that continued to be coated and cured compared with the control group, and finally maintained a high-strength microsphere shape.

Embodiment 3

[0070] As shown in Example 1, the difference is that in the mixing reaction step, a 10% (w / v) lignin glycerin solution is prepared, and then mixed in a ratio of 2:1 by sodium alginate and lignin mass ratio (composite coagulation The lignin content in the beads is 33.3wt%) to prepare composite beads, which are then coated and cured.

[0071] Adsorption performance test:

[0072] The prepared C1 group beads were used for the adsorption of Pb(Ⅱ) and methylene blue solution. Add 10mg of absolute dry beads (C1) to 30mL of Pb(II) solution (20mg / L, PH=6.4), adsorb at 20°C and 250rpm for 3h, and the adsorption amount reaches 53.3mg / g. Add 10 mg of absolute dry beads (C1) to 20 mL of methylene blue solution (30 mg / L, PH=6.8), and adsorb at 20°C for 12 hours at 250 rpm, and the adsorption amount reaches 33.3 mg / g.

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Abstract

The invention relates to a preparation and curing method of sodium alginate-lignin composite gel beads. The method comprises the following steps of mixing a sodium alginate solution with an organic solution of lignin, and dropwisely adding the mixed solution into a calcium chloride or zinc chloride solution by using an injector to obtain the composite gel beads; and carrying out coating and curingtreatment on the composite gel beads by using the sodium alginate solution and the calcium chloride solution. According to the method, ethylene glycol and glycerin which are low in toxicity and smallin pollution are used as solvents to dissolve the lignin, the lignin can be fully dissolved and can also be used as a plasticizer when sodium alginate-lignin is gelatinized, and other toxic and harmful cross-linking agents are prevented from being used. The prepared composite gel beads have high lignin content, high strength, regular shape and uniform particle size, and a certain microsphere formcan be still maintained after further curing treatment. The method is mild in reaction condition, simple, easy to operate and low in manufacturing cost, and a simple and effective storage way is provided for further comprehensive application of the lignin composite gel beads.

Description

technical field [0001] The invention belongs to the technical field of comprehensive application of lignin composite modified materials, and in particular relates to the preparation and solidification method of sodium alginate-lignin composite beads. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] The content of lignin in nature is second only to cellulose, as a renewable natural polymer compound, it is a valuable chemical raw material. The global pulp and paper industry produces about 50 million tons of lignin by-products every year, of which only a small amount is modified and utilized as soil improvers, pesticide slow-release agents, etc., or directly burned, while mos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30
CPCB01J20/24B01J20/28016
Inventor 吕高金罗通王超吉兴香杨桂花陈嘉川
Owner QILU UNIV OF TECH
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