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Preparation method and application method of cellulose xanthogenate heavy metal capturing agent

A heavy metal scavenger and xanthate technology, applied in the fields of resources and environment, can solve the problems of low sulfonation product heavy metal scavenging effect, low cellulose sulfonation rate, increased raw material cost, etc. Economical cost is low, the effect of using less alkali

Inactive Publication Date: 2016-05-25
SHENZHEN DUOYUAN TUOZHAN ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cellulose sulfonation reaction is the reaction between liquid carbon disulfide and the primary alcohol hydroxyl group in the glucose unit of cellulose monomer under alkaline conditions. Heterogeneous reaction of cellulose, carbon disulfide and primary alcohol hydroxyl group in cellulose monomer glucose have very low accessibility, which ultimately leads to low sulfonation rate of cellulose and low heavy metal trapping effect of sulfonated products
In addition, due to the alkalization of cellulose with high-concentration sodium hydroxide, the alkalinity of the alkalized fiber is too strong, and a large amount of carbon disulfide is consumed in the side reaction with the alkali, resulting in an increase in the cost of raw materials

Method used

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  • Preparation method and application method of cellulose xanthogenate heavy metal capturing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] 1) Take the bagasse raw material, wash, dry, pulverize and grind, sieve 60 mesh, and set aside;

[0044] 2) Add 150mL of 20% sodium hydroxide solution pre-cooled to 0~4°C to a 500mL three-necked flask with a stirrer; add 20g of the above-mentioned bagasse dry powder sieved to 60 mesh; stir in an ice bath for 30 minutes; add 150mL A mixed solution containing 6% urea and 8% thiourea was stirred in an ice bath for 60 minutes;

[0045] 3) Add 6mL carbon disulfide solution, stir and react in an ice bath for 2 hours; put the three-neck flask still, pour out the supernatant;

[0046] The bagasse cellulose solution undergoes a sulfonation reaction consisting of the following general reaction formula in the presence of carbon disulfide and alkali to generate bagasse cellulose xanthate sodium salt:

[0047] 3CS 2 +6NaOH→2Na 2 CS 3 +Na 2 CO 3 +3H 2 o

[0048] (C 6 h 9 o 4 Oh) n +nNa 2 CS 3 →(C 6 h 9 o 4 OCSSNa) n ↓+nNaHS

[0049] NaHS+NaOH→Na 2 S+H 2 o

[005...

Embodiment 2

[0057] 1) Take sawdust raw material, wash, dry, pulverize and grind, sieve 60 meshes, set aside;

[0058] 2) Add 200mL of 16% sodium hydroxide solution pre-cooled to 0~4°C to a 500mL three-necked flask with a stirrer; add 30g of the above-mentioned dry powder of sawdust sieved to 60 mesh; stir in an ice bath for 60 minutes; add 200mL containing Mixed solution of 6% urea and 8% thiourea, stirred in ice bath for 60 minutes;

[0059] 3) Add 10mL of carbon disulfide solution, stir and react in ice bath for 2 hours; put the three-neck flask still, pour out the supernatant;

[0060] In the presence of carbon disulfide and alkali, the wood chip cellulose solution undergoes a sulfonation reaction consisting of the following general reaction formula to generate wood chip cellulose xanthate sodium salt:

[0061] 3CS 2 +6NaOH→2Na 2 CS 3 +Na 2 CO 3 +3H 2 o

[0062] (C 6 h 9 o 4 Oh) n +nNa 2 CS 3 →(C 6 h 9 o 4 OCSSNa) n ↓+nNaHS

[0063] NaHS+NaOH→Na 2 S+H 2 o

[0064]...

Embodiment 3

[0073] The cellulose xanthate heavy metal trapping agent made by Example 1 and Example 2 can be applied to heavy metal mining, waste water, heavy metal capture treatment, recovery, heavy metal-containing sludge, bottom mud and heavy metal-contaminated soil Heavy metal exchange, extraction recovery, etc.

[0074] The captured metals include, but are not limited to: copper, lead, zinc, cadmium, nickel, mercury, arsenic, antimony, chromium, manganese, gold, silver, platinum, thallium, uranium, etc.

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Abstract

The invention discloses a preparation method and an application method of a cellulose xanthogenate heavy metal capturing agent. The preparation method comprises following five steps: cellulose raw material pretreatment, cellulose alkalization, alkalized cellulose sulfonation, sulfonated product transformation reaction, and cellulose xanthogenate purification, wherein in the step of cellulose alkalization, under ice-bath conditions, concentrated alkaline swelling and urea-thiourea mixed solution dissolving are adopted to realize dissolving of cellulose. The alkalization technology is capable of reducing using amount of concentrated alkaline in cellulose alkalization, providing an environment with relatively low alkalinity for subsequent sulfonation, and reducing raw material loss caused by side reaction of carbon disulfide with the alkali in sulfonation process; and at the same time, dissolved cellulose is capable of increasing accessibility of carbon disulfide, and reaction speed of sulfonation. The preparation method possesses following advantages: the prepared cellulose xanthogenate is high in yield, sulfur content, and heavy metal capturing effect; the raw materials are easily available; waste materials high in cellulose content such as bagasse and wood flour can be recycled economically and effectively; using amount of the alkali and carbon disulfide is reduced effectively; and the preparation method possesses high economic cost competitive benefits.

Description

technical field [0001] The invention belongs to the field of resources and environment, and in particular relates to a preparation method and a use method of a cellulose xanthate heavy metal trapping agent. Background technique [0002] Xanthate compounds can form insoluble compounds with various metals, and have been widely used in the mining and dressing of metal sulfide ores. In 1977, Wing R.E. and others in the United States developed an insoluble starch xanthate heavy metal collector, which was subsequently hailed as the "best heavy metal collector" and became the winner of the "100 New American Products Award". "one. Since the basic units of cellulose and starch are both glucose, similar products can also be synthesized, and cellulose has the advantages of wider sources than starch, cheaper and easier to obtain, and no need for cross-linking agents. In 1979, John E Hanway et al. introduced the research on the removal of heavy metal ions from wastewater by wood pulp c...

Claims

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Application Information

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IPC IPC(8): C08B9/00C02F1/28C02F1/62
Inventor 潘胜强
Owner SHENZHEN DUOYUAN TUOZHAN ENVIRONMENTAL PROTECTION TECH CO LTD
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