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Cleaning and dechloridizing method for the chloric organic waste material

A technology for organic waste and dechlorination, applied in chemical instruments and methods, solid waste removal, sludge treatment, etc., can solve problems such as low operating cost, long time for degradation treatment, secondary pollution, etc.

Inactive Publication Date: 2005-05-04
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, domestic and foreign studies on PVC degradation are mostly concentrated in organic solvents (such as THF, DMSO), which not only takes a long time to degrade, but also has a low degradation (dechlorination) rate (about 40%) and relatively low operating costs. High, and easy to cause secondary pollution, so it is not suitable for treating a large amount of chlorine-containing organic waste

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] In this example, the PVC pellets (Mw: 38000) produced by Shanghai Chlor-Alkali Factory are processed at a temperature of 200° C., a reaction time of 2 hours, a NaOH concentration of 2 (weight) %, magnesium oxide of 0.1 (weight) %, and an initial pressure of Under the condition of 1.0MPa, most of the chlorine in PVC can be removed, the dechlorination rate can reach 80%, and the yield of solid product (63.11% carbon, 4.53% hydrogen, 10.1% chlorine) yield is 50%.

Embodiment 2

[0017] In this example, the PVC pellets (Mw: 38000) produced by Shanghai Chlor-Alkali Factory are processed at a temperature of 240° C., a reaction time of 4 hours, a KOH concentration of 4 (weight) %, barium oxide of 0.1 (weight) %, and an initial pressure of Under the condition of 2.0MPa, most of the chlorine in PVC can be removed, the dechlorination rate can reach more than 90%, and the yield of solid product (containing 72.92% carbon, 5.29% hydrogen, and 4.0% chlorine) is 48%.

Embodiment 3

[0019] In this example, the PVC pellets (Mw: 38000) produced by Shanghai Chlor-Alkali Factory are processed at a temperature of 280°C, a reaction time of 2 hours, a KOH concentration of 6 (weight)%, calcium oxide of 0.1 (weight)%, and an initial pressure of Under the condition of 3.0MPa, most of the chlorine in PVC can be removed, the dechlorination rate can reach 98%, and the solid product (containing 73.13% carbon, 5.36% hydrogen, and 0.88% chlorine) yield is 45%.

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PUM

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Abstract

The invention discloses a method for dechlorination of chlorine-containing organic waste. The main step is to place the chlorine-containing organic waste in an aqueous solution of 2-10% by weight of inorganic alkali containing 0.05-0.5% by weight of an alkaline earth metal compound , at a temperature of 160-280°C, a pressure of 1.0-5.0Mpa and an inert gas for hydrolytic dechlorination, the present invention is a high dechlorination rate (the dechlorination rate can reach 80%-95%), low operating Clean dechlorination of chlorinated organic wastes at low cost.

Description

technical field [0001] The invention relates to a treatment method for organic waste, in particular to a dechlorination method for chlorine-containing organic waste (PVC). technical background [0002] Polyvinyl chloride (PVC) is one of the five general-purpose plastics in the world. More than half of its molecular weight is chlorine, an associated by-product of the chlor-alkali industry. 20-30% of the total chlorine in foreign countries is consumed by the production of PVC, so it becomes the main lever for chlor-alkali balance. , but it is also one of the main sources of chlorine in solid waste. There are 210 kinds of polychlorinated dibenzodioxins PCDD (Polychlorinated dibenzo-p-dioxins) and polychlorinated dibenzofurans PCDF (Polychlorinated dibenzofurans) (including isomers), commonly known as dioxins, With its extremely toxic and carcinogenic pollution properties, it has become the focus of world attention. Most of the dioxins come from the incineration of garbage, ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00C02F11/00
Inventor 鲁军高晋生马师白
Owner EAST CHINA UNIV OF SCI & TECH