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Amino-modified persimmon tannin adsorbent and its preparation method and application

An adsorbent and persimmon technology, which is applied in the field of effective extraction of scattered metals and preparation of green adsorbents, can solve problems such as waste of resources, and achieve the effects of reduced processing costs, high molybdenum-rhenium separation effect, and simple method

Active Publication Date: 2017-02-15
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The residue after juicing is either directly discarded or used as fertilizer, resulting in a waste of resources

Method used

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  • Amino-modified persimmon tannin adsorbent and its preparation method and application
  • Amino-modified persimmon tannin adsorbent and its preparation method and application
  • Amino-modified persimmon tannin adsorbent and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1 Preparation of Ammonia Modified Persimmon Tannin Adsorbent

[0023] Put 10 g of dried persimmon tannin (PT) powder in a round bottom flask, add 30 mL of 13.5 mol / L sulfuric acid, acidify at a temperature of 90-100° C. for 6 hours, and continuously stir to make it dehydrated and cross-linked. After the reaction is completed, it is suction filtered, washed with deionized water to neutrality, and dried to obtain a black powdery product (CPT). Then add 100mL 6mol / L HCl, 5g paraformaldehyde, 358K oil bath heating for 18h, stirring constantly, after the reaction is completed, suction filtration, wash with deionized water to neutrality, dry at 50℃ for 3h to obtain a black powdery product (Cl- CPT). Put the obtained black powdery product (Cl-CPT) in a 500mL round bottom flask, add 50mL 50% ammonia water, 10mL 37% formaldehyde to it, keep the temperature at 363K, and keep stirring for 3h. After the reaction is complete, filter with suction. Wash with deionized water to ...

Embodiment 2

[0025] Example 2 Preparation of ethylenediamine modified persimmon tannin adsorbent

[0026] The preparation method is the same as that in Example 1, except that the ammonia water is replaced with ethylenediamine. The ethylenediamine modified persimmon tannin adsorbent en-CPT was obtained. The yield is about 90%.

[0027] Elemental analysis data test results: the nitrogen content of the adsorbent is 9.09%, which proves that the obtained product is an adsorbent modified with ethylenediamine.

Embodiment 3

[0028] Example 3 Preparation of persimmon tannin adsorbent modified by methylamine

[0029] The preparation method is the same as in Example 1, except that the ammonia water is replaced with methylamine. The methylamine modified persimmon tannin adsorbent MA-CPT was obtained. The yield is about 90%.

[0030] Elemental analysis data test results: the nitrogen content of the adsorbent is 6.08%, which proves that the obtained product is a methylamine modified adsorbent.

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Abstract

The invention relates to an amine-modified persimmon tannin adsorbent, and a preparation method and an application thereof. The invention adopts a technical scheme that: persimmon tannin is added into sulfuric acid; acidification treatment is carried out under a temperature of 90-100 DEG C, such that a product A is obtained; HCl and paraformaldehyde are added into the product A; 358K oil bath heating is carried out for 15-20h, while continuous stirring is carried out, such that a product B (Cl-CPT) is obtained. The product B (Cl-CPT) is added into a reactor; an ammonia reagent and formaldehyde are added; the temperature is maintained at 363K, and continuous stirring is carried out for 2-4h; when a reaction is completed, suction filtration is carried out; a product is washed to neutral; and the product is dried under a temperature of 60 DEG C, such that the amine-modified persimmon tannin adsorbent is obtained. According to the invention, the amine-modified persimmon tannin adsorbent is obtained through acidification cross-linking and chloromethylation. The absorbent can be used for selectively absorbing molybdenum from a solution comprising molybdenum and rhenium ions. The method provided by the invention has the advantages of low cost and no pollution. The product has high absorption capacity and good molybdenum and rhenium separation selectivity.

Description

Technical field [0001] The invention belongs to the technical field of effective extraction of scattered metals and preparation of green adsorbents, and specifically relates to a method of using amine-modified persimmon tannin to selectively and effectively adsorb molybdenum ions from a solution containing other heavy metal ions to achieve high efficiency of molybdenum rhenium The purpose of separation. Background technique [0002] Because of the special physical and chemical properties of rare metals (gallium, indium, thallium, germanium, selenium, tellurium, rhenium) and their compounds, more and more researchers pay attention. In particular, rhenium (Re) is a widely used element in rare metals. Metal Re and Re alloys are excellent engineering materials. In 1999, it was introduced into the production and use of military stealth fighter jet engine blades. The high temperature characteristics and superior mechanical properties of rhenium metal can greatly improve engine efficie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/22B01J20/30C22B34/34C22B61/00C22B7/00C22B3/24
CPCY02P10/20
Inventor 熊英娄振宁单炜军
Owner LIAONING UNIVERSITY
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