Modified sodium lignin sulfonate chelating agent containing phosphonic acid group and preparation method thereof

A technology of sodium lignosulfonate and chelating agent, applied in the field of chelating agent, can solve problems such as less variety of chelating ability, and achieve the effects of excellent performance-price ratio, improved reactivity and high efficiency

Active Publication Date: 2015-04-29
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problem that there are few varieties of lignin-based chelating agents and the chelating ability needs to be improved, the purpose of the present invention is to provide a modified sodium lignosulfonate chelating agent and a preparation method thereof; Compared with sodium sulfonate, product of the present invention is to Zn 2+ 、Cu 2+ , Pb 2+ 、Ni 2+ The chelating ability of other metal ions is increased by 50% to 108%, and the water solubility is good

Method used

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  • Modified sodium lignin sulfonate chelating agent containing phosphonic acid group and preparation method thereof
  • Modified sodium lignin sulfonate chelating agent containing phosphonic acid group and preparation method thereof
  • Modified sodium lignin sulfonate chelating agent containing phosphonic acid group and preparation method thereof

Examples

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Effect test

Embodiment 1

[0028] Get 100g of sodium lignosulfonate powder from acid pulping waste liquor and add it into water, stir and dissolve to make an aqueous solution with a mass concentration of 30%, add 40g of phenol, adjust the pH value of the system to 9 with 10mol / L NaOH, and place In the frequency conversion microwave reactor, adjust the power to 300W, raise the temperature to 95°C and react for 0.5h; take the above reaction solution out of the microwave reactor, add 15g of epichlorohydrin and 10g of ethylenediamine, and heat it in a normal pressure water bath to adjust the temperature To 80 ° C, stirring the reaction for 1h. Then the system is cooled to 30° C. and then 30 g of phosphorous acid crystals are added, stirred and mixed evenly; after the temperature of the system is lowered to 30° C., 40 g of formaldehyde solution with a mass concentration of 37% is added dropwise (controlling the dripping within 30 minutes), and then the temperature is raised to 80 °C for 2 hours, and the modi...

Embodiment 2

[0031] Take 100 g of sodium lignosulfonate powder from acid pulping waste liquid and add it to water, stir and dissolve to make an aqueous solution with a mass concentration of 35%, add 30 g of resorcinol, and adjust the pH value of the system to 10 with 10 mol / L NaOH Finally, put it in a frequency conversion microwave reactor, adjust the power to 1200W, and heat up to 90°C for 0.5h; take the above reaction solution out of the microwave reactor, add 10g of epichlorohydrin and 12g of diethylenetriamine, and use a normal pressure water bath Heating, adjusting the temperature to 75 ° C, stirring the reaction for 2h. Then the system is cooled to 35°C and then 18g of phosphorous acid crystals are added, stirred and mixed evenly; after the temperature of the system is lowered to 35°C, 35g of formaldehyde solution with a mass concentration of 37% is added dropwise (controlling the dripping within 30min), and then the temperature is raised to 90 °C for 3 hours, and the modified sodium...

Embodiment 3

[0033]Take 100 g of sulfonated alkali lignin sodium salt powder from alkaline pulping waste liquid, add it to water, stir and dissolve to make an aqueous solution with a mass concentration of 30%, add 30 g of hydroquinone, and adjust the pH value of the system with 10 mol / L NaOH After the temperature is 8, it is placed in a frequency conversion microwave reactor, the power is adjusted to 600W, and the temperature is raised to 100 ° C for 1 hour; the above reaction solution is taken out from the microwave reactor, and 20 g of epichlorohydrin and 15 g of 1,3-propylenediamine are added. Heating in a normal pressure water bath, adjusting the temperature to 70°C, and stirring for 1.5h. Then the system is cooled to 40°C and then 15g of phosphorous acid crystals are added, stirred and mixed evenly; after the temperature of the system is lowered to 40°C, 30g of formaldehyde solution with a mass concentration of 37% is added dropwise (controlling the dripping within 30min), and then the...

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Abstract

The invention discloses a modified sodium lignin sulfonate chelating agent containing a phosphonic acid group and a preparation method thereof. The preparation method comprises the following steps: preparing 30-40 mass percent of aqueous solution from sodium lignin sulfonate powder; adding a phenolic substance, regulating the pH value of the system to 8-10, and reacting at the temperature of 90-100 DEG C for 0.5-1 hour by adopting the microwave power of 300-1200W; taking out the reaction solution, adding epoxy chloropropane and short-chain alkyl polyamine, heating in a normal pressure water bath, and reacting at the temperature of 70-80 DEG C for 1-2 hours; cooling to the temperature of 30-40 DEG C, adding a phosphorous acid crystal, and uniformly stirring and mixing; and cooling to the temperature of 30-40 DEG C, dripping a formaldehyde solution, heating to the temperature of 80-100 DEG C, and reacting for 2-4 hours, thereby obtaining the modified sodium lignin sulfonate chelating agent. The chelating agent molecule contains lots of hydroxyl radicals, carboxyl, amido and phosphonic acid groups, can form compound coordination with zinc, copper, lead, nickel and other divalent metal ions and has high chelating ability.

Description

technical field [0001] The invention relates to a chelating agent, in particular to a modified sodium lignosulfonate chelating agent and a preparation method thereof. Background technique [0002] Chelating agents are compounds that can form complexes with metal ions. There are two or more molecules, ions or groups containing lone pairs of electrons in the structure of the chelating agent, which can combine with the empty valence electron layer orbital of the metal ion to form a stable and difficult-to-ionize cyclic chelation substances, thereby immobilizing metal ions. Chelating agents are now mostly used in printing and dyeing, trace element fertilizers, water treatment, soil remediation and other fields. There are various kinds of existing chelating agents, most of which need to be improved in cost performance, and have disadvantages such as being difficult to degrade, toxic, and have certain pressure on the environment, so the application is limited. [0003] The comm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08H7/00
Inventor 邱学青庞煜霞冯雪敏杨东杰黄锦浩
Owner SOUTH CHINA UNIV OF TECH
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