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Cleaning and dechloridizing method for the chloric orgainc waste material

An organic waste and dechlorination technology, applied in chemical instruments and methods, solid waste removal, sludge treatment, etc., can solve the problems of low operating cost, secondary pollution, and long time-consuming degradation treatment.

Inactive Publication Date: 2004-03-17
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

[0017] In this example, the PVC pellets (Mw: 38000) produced by the Shanghai Chlor-Alkali Plant are processed at a temperature of 200° C., a reaction time of 2 h, a NaOH concentration of 2 (weight) %, and 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

[0019] In this example, the PVC pellets (Mw: 38000) produced by Shanghai Chlor-Alkali Plant are treated at a temperature of 240°C, a reaction time of 4h, a KOH concentration of 4% by weight, barium oxide of 0.1% by 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

[0021] In this example, the PVC pellets (Mw: 38000) produced by the Shanghai Chlor-Alkali Plant are treated 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 dechlorination process for chlorinated organic waste includes the main steps of setting the organic waste in 2-10 wt% concentration water solution of inorganic alkali containing alkali earth metal compound in 0.5-0.5 wt%, and hydrolysis to dechlorinate at temperature 160-280 deg.c and pressure 1.0-5.0 MPa and in the presence of inert gas. The present invention can reach dechlorination rate as high as 80-95 %, and has low operation 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 Applications(China)
IPC IPC(8): B09B3/00C02F11/00
Inventor 鲁军高晋生马师白
Owner EAST CHINA UNIV OF SCI & TECH
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