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Process for combination degradation of polychlorinated biphenyls

A technology for polychlorinated biphenyls and dechlorination, which is applied in the direction of protection devices against harmful chemicals, and achieves the effects of rapid degradation of biphenyls, mild reaction conditions, and no secondary pollution.

Active Publication Date: 2013-03-27
YANTAI INST OF COASTAL ZONE RES CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology involves making it possible to use hydrogen gas (H2) with both water and oxygen as its primary sources without causing harmful side products during chemical reactions that involve high temperatures and pressures. By adding certain substances like ammonia or reducing iron fines into these systems, various types of molecules called polybenzene rings may also break down naturally over time by reacting them with specific enzyme groups found on their surfaces. These processes help reduce environmental concerns associated with disposal of waste materials containing halogens such as H2O2. Additionally, this process allows for efficient production of bioactive components from small amounts of starting material through controlled decomposition at lower temperature and pressure levels than traditional methods.

Problems solved by technology

The technical problem addressed by this patented research relates to finding ways to reduce harmful substances from electronic devices containing certain types of plastic components called PCB' s (Printed Circuit Boards). These harmful agents may be released during manufacturing processes due to improper handling techniques like dipping parts together when they come off at different points along its surface.

Method used

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  • Process for combination degradation of polychlorinated biphenyls
  • Process for combination degradation of polychlorinated biphenyls
  • Process for combination degradation of polychlorinated biphenyls

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1) Preparation of hydrodechlorination catalyst: 2.48g FeSO 4 ·7H 2 O and 0.83g PdCl 2 Dissolve in 200ml of 1.0mol / L dilute hydrochloric acid, add 5g of activated carbon and mix well, then add Na 2 CO 3 solution, adjust the pH to 10, stir for 30 min, and wash with deionized water several times until no Cl ions exist in the filtrate. Then add 2.1g NaBH under stirring condition 4 Reduction was carried out for 1 h, washed with deionized water several times until the filtrate was neutral, and dried at room temperature to obtain a 1.0%Pd-1.0%Fe / C catalyst. Palladium-iron / carbon catalysts with different contents prepared in the same way are listed in Table 1.

[0034] According to the preparation process of the catalyst described in Example 1, except that the active component and the carrier are different, all the other processes are the same. The preparation can obtain supported catalysts with different carriers and different active components. The prepared catalyst is l...

Embodiment 2

[0042] Take by weighing the 1.0%Ni-1.0%Fe / C catalyst that 0.1g table 1 prepares, join in the there-necked flask of 100ml, add the 4-chlorobiphenyl / ethanol-water solution 80ml that concentration is 200ppm, make under magnetic stirrer stirring The reactants were adsorbed for 15 minutes; at the same time, N 2 Replace the air in the reactor, do this three times, and then pass H 2 , H 2 The flow rate is controlled within the range of 10ml / min, and the basic proton absorbent used is sodium hydroxide, but in order to ensure that the second step oxidation reaction can be carried out relatively quickly, the molar ratio of the amount of alkali to the amount of the reaction substrate is 1.1 : 1, the reaction temperature is controlled at 30°C, and the reaction pressure is normal pressure; centrifuge the reaction solution, adjust the pH value of the reaction solution to 7.0, and perform the hydrodechlorination reaction for 120min;

[0043] After the reaction, 9 ml of the reaction solutio...

Embodiment 3

[0045] Weigh 0.1g of the 1.0%Pd-1.0%Fe / C catalyst prepared in Table 1, join in a 100ml three-necked flask, add 80ml of PCB / ethanol-water solution with a concentration of 200ppm, and make the reaction under magnetic stirrer stirring The substance was adsorbed for 15min; at the same time, N 2 Replace the air in the reactor, do this three times, and then pass H 2 , H 2 The flow rate is controlled within the range of 10ml / min, and the basic proton absorbent used is sodium hydroxide, but in order to ensure that the second-step oxidation reaction can be carried out relatively quickly, the molar ratio of the amount of alkali to the amount of Cl in the reaction substrate The ratio is 1.1:1, the reaction temperature is controlled at 30°C, and the reaction pressure is normal pressure; centrifuge the reaction liquid, adjust the pH value of the reaction liquid to 7.0, and carry out the hydrodechlorination reaction for 180 min;

[0046] After the reaction, 9 ml of the reaction solution w...

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Abstract

The invention relates to a combination degradation technology, and particularly relates to a process for combination degradation of polychlorinated biphenyls. According to the process, polychlorinated biphenyls in an organic-aqueous system are subjected to reductive dechlorination reaction for 1.5-4h by adding an alkaline proton absorbent under the catalysis of transition metals with hydrogen gas as the gas source, and subsequently the reaction solution of the reductive dechlorination reaction is added into a carbon-free culture medium for cultivation of candida tropicalis to result in full degradation of the polychlorinated biphenyls. The process has the advantages that the catalysis reduction efficiency of polychlorinated biphenyls is high, and the reaction conditions are simple and modest; the reactants are thoroughly degraded; the operation is easily controlled and the cost is low; and the process is economic and environment-friendly.

Description

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Claims

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Application Information

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Owner YANTAI INST OF COASTAL ZONE RES CHINESE ACAD OF SCI
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