Application of sulfur-containing polyimide resin as silver adsorbent

A technology of sulfur-containing polyimide resin and sulfur-polyimide resin, which is used in the application field of sulfur-containing polyimide resin as a silver adsorbent, can solve the problems of complicated post-processing, and achieve convenient operation and smooth adsorption process. Simple, thermally stable results

Pending Publication Date: 2020-05-01
INSPECTION & QUARANTINE TECH CENT OF NINGBO ENTRY EXIT INSPECTION & QUARANTINE BUREAU +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the enrichment and adsorption of precious metals are generally carried out with a granular structure, and the post-processing is more complicated.

Method used

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  • Application of sulfur-containing polyimide resin as silver adsorbent
  • Application of sulfur-containing polyimide resin as silver adsorbent
  • Application of sulfur-containing polyimide resin as silver adsorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] The sulfur-containing diamine monomer 2,2'-bis(sulfonic acid)-4,4'-diaminodiphenyl ether (ODADS) and the sulfur-free diamine monomer 4,4'-diaminodiphenyl ether The molar ratio of (ODA) was set to 6:4 for the feeding reaction, and the reaction was carried out according to the preparation method of random sulfur-containing polyimide to obtain random sulfur-containing polyimide resin particles.

[0056] Add 2,2'-bis(sulfonic acid)-4,4'-diaminodiphenyl ether ODADS (0.6524g, 1.81mmol), triethylamine (0.5390g, 5.33mmol) and 8mL m-cresol, stirred to dissolve ODADS completely, then added 4,4'-diaminodiphenyl ether ODA (0.2417g, 1.21mmol), thioether naphthalene dianhydride SBNTA (1.2866g, 3.02mmol) and Benzoic acid (0.5522g, 4.53mmol). The mixture was stirred at room temperature for 30 minutes, then warmed to 80°C for 4h and 180°C for 18h. When the mixture was cooled to 80°C, it was poured into 500 mL of acetone to obtain a fibrous polymer. After washing once with acetone, ex...

Embodiment 2

[0063] The molar ratio of the sulfur-containing diamine monomer and the sulfur-free diamine monomer is set to 6:4 for the feeding reaction, and the reaction is carried out according to the preparation method of the block-type sulfur-containing polyimide resin, and the hydrophilic intercalation is controlled. segment length, to obtain block type sulfur-containing polyimide resin particles.

[0064] Add sulfonated diamine ODADS (0.6618g, 1.84mmol), triethylamine (0.4467g, 4.41mmol) and 8mL m-cresol into a No. Ether naphthalene dianhydride SBNTA (0.7640 g, 1.79 mmol) and benzoic acid (0.3274 g, 2.68 mmol). The mixture was stirred at room temperature for 30 minutes, then heated to 80° C. for 4 hours, and 180° C. for 18 hours to obtain an amine-terminated polyimide oligomer. Add the remaining naphthalene dianhydride SBNTA (0.5420g, 1.27mmol) and 8mL m-cresol into another No. 2 oblique three-neck flask protected by nitrogen, stir and dissolve, then add unsulfonated diamine ODA (0.2...

Embodiment 3

[0071]The molar ratio of the sulfur-containing diamine monomer and the sulfur-free diamine monomer is set to 6:4 for feeding reaction, and the reaction is carried out according to the preparation method of the block type sulfur-containing polyimide resin of Example 2, and the control By adjusting the length of the hydrophilic block, block-type sulfur-containing polyimide resin particles are prepared.

[0072] Add iron ions, zinc ions, copper ions and cadmium ions to the silver ion solution to prepare a multi-element mixed solution containing 2 mg / L of silver ions, 1 mg / L of iron, zinc, copper and cadmium ions each.

[0073] Get 1.0g of the block type sulfur-containing polyimide resin particles prepared above, join in 50mL the multi-element mixed solution that contains the silver ion of 2mg / L, the iron of 1mg / L, zinc, copper, cadmium ion, put Go into the shaker and vibrate for 30 minutes, centrifuge and get the supernatant, the concentration of silver ions in the supernatant is...

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Abstract

The invention discloses an application of sulfur-containing polyimide resin as a silver adsorbent. The sulfur-containing polyimide resin is random sulfur-containing polyimide resin or block sulfur-containing polyimide resin, the structural formula of the random sulfur-containing polyimide resin is shown as a formula I; the structural formula of the block sulfur-containing polyimide resin is shownas a formula II. The sulfur-containing polyimide resin particles can also be prepared into a film type adsorbent and are convenient to use. According to the method, the adsorption process of silver issimple and convenient to operate, the adsorbent has specific adsorption on the silver element, and meanwhile the adsorption process is not interfered by common elements such as potassium, sodium, calcium, magnesium, iron, zinc, copper and cadmium. The adsorbent provided by the invention can be normally used in strong acid, high-temperature and high-pressure environments, and the resin material can be regenerated through a simple desorption process, so that the adsorbent is economic and environment-friendly.

Description

technical field [0001] The invention relates to the application of a sulfur-containing polyimide resin as a silver adsorbent. Background technique [0002] As a precious metal, silver is a precious natural resource. It has high physical and chemical stability and is easy to cut. It is often used as precious jewelry and currency. In modern industry, because of its good ductility, electrical conductivity, corrosion resistance, oxidation resistance and catalytic activity, it is widely used in chemical industry, light industry, aviation, military industry, medicine and environmental protection and other fields. [0003] However, the content of silver in the earth's crust is very small, and the resource is extremely scarce relative to the increasing demand. At present, the precious metal metallurgy industry mainly adopts the hydrometallurgical process, which is simple in operation and low in production cost, but there are problems such as low concentration of precious metals in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/30C02F1/28C02F101/20
CPCB01J20/262C02F1/285C02F2101/20
Inventor 钟莺莺陈国飞赵海英谭曜马侦王涛许赛慧
Owner INSPECTION & QUARANTINE TECH CENT OF NINGBO ENTRY EXIT INSPECTION & QUARANTINE BUREAU
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