A method for harmless debromination of bromine-containing plastic waste

A harmless and plastic technology, applied to the removal of solid waste, etc., can solve the problems of harsh reaction conditions, high equipment material requirements, corrosion of reaction equipment, etc., achieve mild reaction conditions, improve debromination efficiency, and be easy to control Effect

Inactive Publication Date: 2017-04-19
FUJIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the disadvantage of pyrolysis debromination is that the formation of dioxin-like products and debromination are not complete; microbial degradation and ultraviolet light irradiation are only suitable for the treatment of low-level brominated flame retardants in the environment, and due to the debromination efficiency Secondary pollution and cost problems are difficult to realize engineering application; zero-valent metal catalytic technology generally uses water medium at normal temperature and pressure, but due to the low yield of ionized hydrogen in water medium at normal temperature and pressure and the extremely limited use of brominated flame retardants and plastics The solvency limits the application of zero-valent metal-catalyzed debromination
However, the supercritical water technology used in the debromination of bromine-containing plastics mainly has the following two disadvantages: (1) the reaction conditions are harsh, the temperature reaches 374 ° C, the pressure reaches 22 MPa, the energy consumption is large, and the actual control requirements are high; (2) Acidic substances are produced during the reaction process, which severely corrodes the reaction equipment under high temperature and high pressure conditions, and requires high equipment materials, resulting in high equipment cost
In fact, these two shortcomings of supercritical water debromination technology also greatly limit its application in the harmless treatment of bromine-containing plastic waste

Method used

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  • A method for harmless debromination of bromine-containing plastic waste
  • A method for harmless debromination of bromine-containing plastic waste

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Experimental program
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Effect test

Embodiment 1

[0024] Such as figure 1 with figure 2 As shown, first cut the waste computer plastic case containing bromine 14.8% (w / w%) into a shape of about 3cm × 3cm, put 5 grams of it in a high-temperature and high-pressure reactor with a volume of 200 milliliters, and then pour it into the reactor Add 75 milliliters of aqueous ammonia with a concentration of 25%, seal the reactor, heat up to 300° C., control the pressure at 9.82 MPa, and start timing. Heating was stopped after 10 min of reaction. When the temperature of the reactor is lowered to room temperature, the reactor is opened, and the reaction product is transferred to a centrifuge tube. After centrifugation, the filtrate is ultrasonically extracted with dichloromethane for 20 minutes, and the oil phase product is separated by shaking, and then the water is removed by anhydrous sodium sulfate. , Remove dichloromethane with a rotary evaporator to obtain oil, and the evaporated dichloromethane extractant is recovered and recyc...

Embodiment 2

[0026] Such as figure 1 with figure 2 As shown, first cut the waste computer plastic casing containing bromine 14.8% (w / w%) into a shape of about 3cm×3cm, put 5 grams of it in a high-temperature and high-pressure reactor with a volume of 200 milliliters, and then pour it into the reactor. Add 75 milliliters of aqueous ammonia with a concentration of 25%, seal the reactor, heat up to 300° C., control the pressure at 9.82 MPa, and start timing. Heating was stopped after 15 minutes of reaction. When the temperature of the reactor is lowered to room temperature, the reactor is opened, and the reaction product is transferred to a centrifuge tube. After centrifugation, the filtrate is ultrasonically extracted with dichloromethane for 20 minutes, and the oil phase product is separated by shaking, and then the water is removed by anhydrous sodium sulfate. , Remove dichloromethane with a rotary evaporator to obtain oil, and the evaporated dichloromethane extractant is recovered and ...

Embodiment 3

[0028] Such as figure 1 with figure 2 As shown, first cut the waste computer plastic casing containing bromine 14.8% (w / w%) into a shape of about 3cm×3cm, put 5 grams of it in a high-temperature and high-pressure reactor with a volume of 200 milliliters, and then pour it into the reactor. Add 75 milliliters of aqueous ammonia with a concentration of 25%, seal the reactor, heat up to 300° C., control the pressure at 9.82 MPa, and start timing. Heating was stopped after 30 minutes of reaction. When the temperature of the reactor is lowered to room temperature, the reactor is opened, and the reaction product is transferred to a centrifuge tube. After centrifugation, the filtrate is ultrasonically extracted with dichloromethane for 20 minutes, and the oil phase product is separated by shaking, and then the water is removed by anhydrous sodium sulfate. , Remove dichloromethane with a rotary evaporator to obtain oil, and the evaporated dichloromethane extractant is recovered and ...

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Abstract

The invention discloses a method for harmlessly debrominating bromine-containing plastic waste. The method comprises the following steps: a, pre-processing raw materials; b, performing debromination reaction under high pressure at a high temperature; c, post-processing. The method achieves the following technical goals: firstly, the critical pressure and critical temperature of ammonia water are much lower than those of water, the reaction conditions are gentle, the energy consumption is relatively low, and the reaction is easy to control; secondly, hydroxy radicals which are dissociated in reaction by utilizing the ammonia water are used for neutralizing acidy substances in a reaction process, so that the corrosion of a reaction product to the equipment is avoided; thirdly, ammonium radical ions which are dissociated in reaction by utilizing the ammonia water are used for catching bromine produced in the reaction, so that the debrominating efficiency is further improved.

Description

technical field [0001] The invention relates to a method for converting solid waste into harmless or useful substances, in particular to a method for harmless debromination of bromine-containing plastic waste. Background technique [0002] Bromine-containing plastic waste is one of the fastest growing solid wastes in the past 10 years. Brominated plastic waste contains a variety of brominated flame retardants, commonly used brominated flame retardants are divided into additive types such as polybrominated diphenyl ethers, polybrominated biphenyls, hexabromocyclododecane, and reactive types such as tetrabromobisphenol A . A variety of brominated flame retardants have been included in the new batch of persistent organic pollutants in 2009, which have potential bioaccumulation toxicity and environmental endocrine disrupting effects. Therefore, debromination treatment must be carried out when disposing of waste bromine-containing plastics or recycling them as resources. Tradi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00B09B5/00
Inventor 修福荣齐莹莹
Owner FUJIAN UNIV OF TECH
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