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Method for efficiently dehalogenating waste plastics

A high-efficiency technology for waste plastics, applied in the field of dehalogenation of halogen-containing waste plastics, can solve the problems of low energy consumption, achieve high reaction temperature, reduce operation difficulty, and simple process methods

Active Publication Date: 2016-02-03
CHINA UNIV OF MINING & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a method for efficient dehalogenation of waste plastics, which has low energy consumption, fast degradation, and reduces the possibility of chlorine corrosion and dioxin pollution that may occur in plastic incineration. question

Method used

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  • Method for efficiently dehalogenating waste plastics

Examples

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Embodiment 1

[0025] Embodiment one: chlorinated polyvinyl chloride is an example:

[0026] Step 1: Chlorinated polyvinyl chloride produced by a certain manufacturer has a chlorine content of 62.5%, does not add alkaline chemical raw materials, and does not add Ni 2+ , mix and stir PVC and deionized water in a mass ratio of 1:15;

[0027] Step 2: hydrothermally treating the mixture in step 1 at 220° C. for 45 minutes;

[0028] Step 3: Dehydrating the mixture in Step 2, the content of organic chlorine in the solid phase product is reduced to 53.75%, and the removal rate of organic chlorine is only 12.48%.

[0029] Under the same conditions, adding nickel nitrate makes the Ni in the solution 2+ The concentration is 0.01mol / L, and the removal rate of organic chlorine reaches 79.51%.

Embodiment 2

[0030] Embodiment two: Take industrial polyvinyl chloride PVC as an example

[0031] Step 1: The chlorine content of polyvinyl chloride PVC is 56.8%, add 6% CaO, add water, add a certain amount of nickel nitrate again, make the Ni in the solution 2+ The concentration is 0.01mol / L, mix and stir evenly;

[0032] Step 2: hydrothermally treating the mixture in step 1 at 200° C. for 30 minutes;

[0033] Step 3: Dehydrate the reacted mixture in Step 2, dry it, measure the chlorine content in the solid, and calculate the removal amount of chlorine to be 68.14%.

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Abstract

The invention discloses a method for efficiently dehalogenating waste plastics. The method comprises the following three steps: 1. quenching and tempering: adding an alkaline chemical raw material to the waste plastics, then adding a solution of a Ni<2+> chemical raw material / waste material and stirring and uniformly mixing the materials; 2. hydrothermal treatment: carrying out hydrothermal treatment on the prepared waste plastics at 200-240 DEG C for 10-60 minutes; 3. dehydration: carrying out solid-liquid separation on a mixture obtained after hydrothermal treatment, thus obtaining coke. The method has the beneficial effects that the function of Ni<2+> in plastic dehalogenation is confirmed for the first time; the method has the characteristics that the adding proportion of the alkaline chemical raw material is extremely small; the cost is low; the process is simple; the halogen removal efficiency is high; the reaction temperature is low; the time is short; the halogen containing rate of the waste plastics is reduced to about 0 from 56.8-74%; secondary pollution can not be caused; the plastics excluding halogen and some chemical raw materials after separation can be recycled, thus avoiding the problems of chlorine corrosion and dioxin pollution during halogen-containing plastic burning and providing beneficial conditions for harmless treatment and recycling of the halogen-containing plastics.

Description

technical field [0001] The invention relates to a method for harmless treatment and resource utilization of waste plastics, in particular to a device and method for dehalogenating waste plastics containing halogen. Background technique [0002] Plastic products account for about 30% to 40% of the waste content, and most plastic products are usually added with different amounts and different types of halogens to meet different purposes. For example, in order to reduce production costs and increase the ignition point of products, chlorine is often added to PVC products. On the other hand, in order to make plastic products flame retardant, bromine is added to almost all plastic products of electronic appliances. Halogen plays a unique role in different types of plastic products, but at the same time, the existence of halogen also brings great difficulties to the disposal and resource utilization of waste plastics. [0003] There are usually three ways to deal with halogen-con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J11/14C08J11/16
CPCY02W30/62
Inventor 赵培涛李照志李田李响
Owner CHINA UNIV OF MINING & TECH
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