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Globular cellulose chelate sorbent containing amidoxime group and carboxy and preparation method thereof

A technology of chelating adsorbent and cellulose, applied in the field of spherical cellulose chelating adsorbent and its preparation, can solve the problems of large flow resistance, hindering large-scale industrial application, poor hydraulic properties, etc. The effect of good special adsorption selectivity of precious metals and simple and easy method

Active Publication Date: 2009-02-04
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because cellulose and its derivatives are in the form of fibers, powders or particles, they have disadvantages such as poor hydraulic properties and large flow resistance, which hinder their large-scale industrial application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The specific process steps and the order of the present embodiment are as follows:

[0040] Raw materials and formulations of graft copolymerization of spherical cellulose beads and acrylonitrile, saponification and amidoximation graft copolymerization of saponification products (unit-kg)

[0041] Cellulose beads: 5.0 kg

[0042] Acrylonitrile: 8.0 kg

[0043] Initiator: 0.15 kg (including 0.05 kg of ammonium cerium nitrate and 0.1 kg of 0.83mmol / L nitric acid solution)

[0044] Distilled water: 45kg

[0045] Sodium hydroxide solution (0.13mol / L): 15 kg

[0046] Hydroxylamine hydrochloride: 5 kg

[0047] Anhydrous sodium carbonate: 6.35 kg

[0048] Solvent (methanol): 15.5 kg

[0049] Process steps and process parameters of graft copolymerization: In a reactor equipped with a stirring, condensing and reflux device and an automatic feeding device with a built-in constant temperature system, add spherical cellulose beads, distilled water and an initiator, and stir for...

Embodiment 2

[0053] The specific process steps and the order of the present embodiment are as follows:

[0054] Raw materials and formulations of graft copolymerization of spherical cellulose beads and acrylonitrile, saponification and amidoximation graft copolymerization of saponification products (unit-kg)

[0055] Cellulose beads: 5.28 kg

[0056] Acrylonitrile: 5.0 kg

[0057] Initiator: 0.22 kg (including 0.1 kg H 2 o 2 and 0.12 kg of ferrous sulfate)

[0058] Distilled water: 40kg

[0059] Sodium hydroxide solution (0.15mol / L): 13 kg

[0060] Hydroxylamine hydrochloride: 6 kg

[0061] Anhydrous sodium carbonate: 5.5 kg

[0062] Solvent (the volume ratio of methanol to water is 1:2): 25 kg

[0063] Process steps and process parameters of graft copolymerization: In a reactor equipped with a stirring, condensing and reflux device and an automatic feeding device with a built-in constant temperature system, add spherical cellulose beads, distilled water and an initiator, and stir ...

Embodiment 3

[0067] The specific process steps and the order of the present embodiment are as follows:

[0068] Raw materials and formulations of graft copolymerization of spherical cellulose beads and acrylonitrile, saponification and amidoximation graft copolymerization of saponification products (unit-kg)

[0069] Cellulose beads: 6 kg

[0070] Acrylonitrile: 6.95 kg

[0071] Initiator: 0.53 kg (including 0.23 kg of ferric chloride and 0.3 kg of thiourea)

[0072] Distilled water: 42 kg

[0073] Sodium hydroxide solution (0.16mol / L): 11 kg

[0074] Hydroxylamine hydrochloride: 7 kg

[0075] Anhydrous sodium carbonate: 4.52 kg

[0076] Solvent (the volume ratio of methanol to water is 1:1): 22 kg

[0077] Process steps and process parameters of graft copolymerization: In the reactor equipped with stirring, condensing reflux device and automatic feeding device with built-in constant temperature system, add spherical cellulose beads, distilled water and initiator (and nitric acid), 7...

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Abstract

The invention discloses a spherical cellulose chelate sorbent with amidoxime group and carboxyl group and a preparation method thereof. The average pore size of the spherical cellulose chelate sorbent is 5-40nm, the specific surface area is 160-750m<2> / g, the skeletal density is 0.94-1.45g / ml, the apparent density is 0.35-0.78g / ml, the pore volume is 0.25-1.3ml / g, the water content is 45%-70%, the contents of the amidoxime group and the carboxyl group are respectively 10.6-15.0mmol / g and 0.30-0.80mmol / g. The preparation method comprises the steps of graft copolymerization, saponification and the formation of amidoxime. The spherical cellulose chelate sorbent with the amidoxime group and the carboxyl group of the invention has the advantages of high polarity and excellent special noble metal absorption selectivity, simple and easy preparation method and low manufacturing cost; and the cellulose is an abundant natural renewable material; therefore, the spherical cellulose chelate sorbent with the amidoxime group and the carboxyl group can produce practical economic benefit and environmental benefit on enrichment recovery of the noble metals, etc.

Description

technical field [0001] The invention belongs to the field of functional polymer materials, and in particular relates to a spherical cellulose chelating adsorbent containing amidoxime group and carboxyl group and a preparation method thereof. Background technique [0002] In today's world, the reserves of oil and natural gas resources are limited, and their research, development and utilization have an increasingly serious impact on the earth's ecological environment, which has prompted the vigorous development of polymer materials based on natural resources. Cellulose is the most abundant and recoverable natural resource on the earth. It is cheap, degradable and does not pollute the environment. Therefore, all countries in the world attach great importance to the research and development of cellulose. Cellulose adsorbent is one of the important development directions of cellulose functional polymer materials. This kind of adsorbent not only has the adsorption capacity of ac...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30
Inventor 刘明华池明霞黄统琳
Owner FUZHOU UNIV
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