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A process for the capture and dehalogenation of halogenated hydrocarbons

A halogenated hydrocarbon, dehalogenation technology, applied in chemical instruments and methods, dehalogenation preparation, restoration of contaminated soil, etc., can solve problems such as aquifer contamination, restriction of future use, public health impact, and degradation of groundwater resources

Inactive Publication Date: 2009-11-25
ENVIRONMENTAL BIOTECH CRC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Emissions of volatile halogenated organic compounds to soil have resulted in contamination of aquifers, causing potential public health impacts and degradation of groundwater resources, limiting future use

Method used

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  • A process for the capture and dehalogenation of halogenated hydrocarbons
  • A process for the capture and dehalogenation of halogenated hydrocarbons
  • A process for the capture and dehalogenation of halogenated hydrocarbons

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0095] Example 1 - Removal of HCBD on activated carbon with ethanol / water

[0096] HCBD-enriched activated carbon (containing approximately 30 mg HCBD) was packed into a stainless steel Swage Lock conduit to simulate an activated carbon trap loaded with HCBD (the activated carbon was obtained from Sigma-Aldrich, Milwaukee, WI, USA Co. (Sigma-Aldrich) powder (60 mesh)). In two attempts to remove HCBD from activated carbon, the trap was connected to an HPLC pump and rinsed with 100% ethanol and an ethanol / water mixture (90%). In both cases, more than 99% of the HCBD was eluted in the first 50 ml of eluate.

Embodiment 2

[0097] Example 2 - Recycling Activated Carbon with Ethanol / Water

[0098] To determine the potential for activated carbon recycling, air flow was passed through a stainless steel tank (HCBD reservoir) containing cotton wool saturated with HCBD. The HCBD-laden air flow from the reservoir continues through 2 activated carbon (200 mg) columns (see figure 2 ). After about 24 hours, remove the activated carbon trap and replace with ethanol / water VB 12 The mixture (50 mL, 90:10 ethanol / water, 1 mg / mL) was washed.

[0099] The concentration of HCBD in the eluate was analyzed (see Table 1). The results showed that the activated carbon could be reused at least seven times without affecting its performance.

Embodiment 3

[0100] Example 3 - Reduction of HCBD with zero-valent zinc in ethanol / water

[0101] A series of experiments was set up to determine whether HCBD could be reduced with zinc in ethanol without the addition of water, and then to determine the effect of increasing water content on the rate of the reduction reaction.

[0102] HCBD (100 mg, 0.32 mmol) was reduced 5 times with zinc (130 mg, 2.0 mmol) in ethanol containing 0%, 1%, 5%, 10% and 20% water (total volume = 10 mL) . The progress of the reaction was monitored by GC / MS analysis of the resulting decrease in HCBD front area over time. Increasing water content in the solvent system increased the reduction rate, ie 20% water (0.5 micromol / hour), 10% water (0.06 micromol / hour), 5% water (0.3 micromol / hour).

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Abstract

The present invention relates to a process for dehalogenation of a halogenated hydrocarbon comprising: desorbing a halogenated hydrocarbon from a solid phase using a solvent; and dehalogenating the halogenated hydrocarbon in a solvent which comprises the solvent used in the desorption step.

Description

technical field [0001] The present invention relates to a method for the capture and subsequent dehalogenation of halogenated hydrocarbons. Background technique [0002] Contamination of various sites such as subsoil by halocarbons is an important problem in many parts of the world. Emissions of volatile halogenated organic compounds to soil have resulted in contamination of aquifers, causing potential public health impacts and degradation of groundwater resources, which in turn limits future use. The threat posed by the toxicity of halocarbons means that contaminated sites need to be effectively decontaminated and, accordingly, dehalogenated halocarbons. [0003] In areas where underground soil is contaminated with halogenated hydrocarbons, surface halogenated hydrocarbons are removed, followed by dehalogenation. [0004] The present invention provides a convenient and efficient method of removing halogenated hydrocarbons from the site for subsequent dehalogenation steps....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C17/23C02F11/00C02F101/36B09C1/02
CPCB09C1/02C07C17/23
Inventor M·J·李R·考德-鲁威奇
Owner ENVIRONMENTAL BIOTECH CRC
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