Sampling filter for chlorinated organic compounds

a chlorinated organic compound and filter technology, applied in the direction of moving filter element filter, filtration separation, separation process, etc., can solve the problems of high-reliability analysis results, and high-reliability analysis results cannot be expected

Inactive Publication Date: 2005-06-09
MIURA COMPANY LIMITED +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention relates to a sampling filter for chlorinated organic compounds that can remove and sample these compounds from fluids. The filter is made of a fluid-permeable molded body containing fibers and an inorganic binder for binding the fibers together. The filter can collect various types of chlorinated organic compounds in both particulate and gaseous forms simultaneously when the fluid passes through it. The collected compounds can be easily sampled and extracted using various extraction operations. The invention also includes a collector for collecting the chlorinated organic compounds from a fluid flowing in a transportation pipe. The technical effects of the invention are the ability to simultaneously collect and sample various types of chlorinated organic compounds in both particulate and gaseous forms, making the process more efficient and effective.

Problems solved by technology

Further, polychlorobiphenyls are also strongly toxic environmental pollutants and coplanar PCBs among them is recognized similarly as the most intensely toxic environmental pollutant.
Especially, since dioxins and coplanar PCBs, environmental pollutants as described above, are contained extremely slight in amounts in the sample gas and regardless of the existence forms such as particulate form or gaseous form, the types varies widely, failing precise sampling, highly reliable analysis results cannot be expected.
Further, the above-described coplanar PCBs is contained in a large amount in atmospheric air and if the sample gas is contaminated with such coplanar PCBs, highly reliable analysis results cannot either be expected.
Such a sampling apparatus has a complicated constitution comprising the first collector and the second collector and is costly owing to the use of many appliances made of glass, so that in many cases, the apparatus is used repeatedly.
In such a case, since it is required to keep the respective members such as impingers clean in order to retain the reliability of the measurement data, the preparatory operation such as a washing work and the like to be carried out before sampling of a sample gas becomes extremely complicated.
Further, at the time of sampling the gaseous chlorinated organic compounds contained in the sample gas by the second collector, the second collector is required to be cooled by a cooling material such as dry ice and the sample-sampling operation itself becomes extremely complicated, too.
Therefore, the extraction operation itself becomes complicated and takes a long time to finish and further the reliability of the analysis results is, in many cases, affected by the skills of the extraction operation.
Further, the sampling apparatus comprises two types of collectors, the first collector and the second collector, so that the apparatus is inevitably enlarged, and also glass appliances are used a lot, therefore the apparatus is easy to be broken to make handling and transportation difficult at the time of sampling the sample gas.

Method used

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  • Sampling filter for chlorinated organic compounds
  • Sampling filter for chlorinated organic compounds
  • Sampling filter for chlorinated organic compounds

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0072] An aqueous alumina dispersion containing about 20% by weight of granular alumina (an inorganic binder) was prepared and alumina fibers (containing 72% by weight of γ-alumina and 28% by weight of silica) having an average fiber diameter of 6 μm and an average aspect ratio of 2,000 as fibers were added to the alumina dispersion and mixed well. The obtained molding material was molded in a one end-closed cylindrical shape and sintered at 200° C. Consequently, a cylindrical molded body (a sampling filter) having the weight of 8.5 g and the bulk density of 0.38 g / cm3 was obtained which was so adjusted as to have the same sizes as those of Comparative example 1. Incidentally, the glass fibers and the granular alumina contained in the molded body were 5.7 g and 2.8 g, respectively.

[0073] The electron microscopic photograph of a part of the obtained molded body is shown in FIG. 5. From FIG. 5, the molded body was found having a gas-permeability and fine mesh structure (three-dimensi...

example 2

[0075] A cylindrical molded body (a sampling filter) having a gas-permeability and the same sizes as those of Example 1 was obtained by the same operation as that in the case of Example 1, except that alumina fibers (containing at least 95% by weight of γ-alumina) having an average fiber diameter of 5 μm and an average aspect ratio of 2,400 as fibers were used. The molded body had a weight of 7.9 g and the bulk density of 0.32 g / cm3 and the alumina fibers and the granular alumina contained in the molded body were 5.3 g and 2.6 g, respectively.

[0076] Using the obtained sampling filter, the chlorinated organic compounds contained in a sample gas sampled from the flue duct in the same manner as Comparative example 1 were sampled and the results of their quantitative analysis were compared with those obtained in the case of sampling by the apparatus exemplified in JIS formulation. In both cases the average concentration of carbon monoxide in the sample gas was 150 ppm or lower and the ...

example 3

[0077] A molded body obtained in Example 1 was further immersed in an aqueous dispersion containing 20% by weight of granular alumina dispersed and then taken out and dried by heating at 200° C. Consequently, a molded body (a sampling filter) having a weight of 12.8 g and the bulk density of 0.6 g / cm3 was obtained.

[0078] Using the obtained sampling filter, the chlorinated organic compounds contained in a sample gas sampled from the flue duct in the same manner as Comparative example 1 were sampled and the results of their quantitative analysis were compared with those obtained in the case of sampling by the apparatus exemplified in JIS formulation. In both cases the average concentration of carbon monoxide in the sample gas was 150 ppm or lower and the concentration was 750 ppm, the amount of the chlorinated organic compounds sampled by the sampling apparatus employing the sampling filter of this example was found different from the amount of the chlorinated organic compounds sampl...

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Abstract

A collector 3 capable of collecting and sampling simultaneously various types of chlorinated organic compounds in both particulate and gaseous forms contained in a fluid and easy to extract the sampled chlorinated organic compounds therefrom includes a sampling filter 7 installed in a holder 6 having a discharge route 12a. The sampling filter 7 contains fibers and an inorganic binder for binding the fibers to one another and has a fluid-permeability. Various types of the chlorinated organic compounds such as dioxins and coplanar PCBs in both particulate and gaseous forms contained in a sample gas flowing into the holder 6 from a flue duct 25 through a sampling pipe 2 and an introduction pipe 8 are collected and sampled while the sample gas being passed through the sampling filter 7 and the resulting sample gas from which the chlorinated organic compounds are removed is then discharged out to the outside through the discharge route 12a.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a sampling filter for chlorinated organic compounds, especially a filter for removing chlorinated organic compounds contained in a fluid from the fluid and sampling them. BACKGROUND ART [0002] A waste gas generated from incineration facilities for incinerating wastes such as industrial wastes and domestic refuse contains various types of chlorinated organic compound such as dioxins, coplanar PCBs, and further polychlorobiphenyl, chlorophenol and chlorobenzene. [0003] Here, the word, dioxins, is a general term of polychlorodibenzo-p-dioxins (PCDDs), polychlorodibenzofuran (PCDFs), and the like and as known well, they are extremely toxic environmental pollutants and especially tetrachlorodibenzodioxins (T4CDDs) among them is known as the most intensely toxic environmental pollutant. Further, polychlorobiphenyls are also strongly toxic environmental pollutants and coplanar PCBs among them is recognized similarly as the most...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): B01D39/16B01D39/20B01D53/04
CPCB01D39/202B01D2258/0291B01D39/2075B01D39/2086B01D53/02B01D53/0423B01D53/0431B01D53/0438B01D2239/0407B01D2239/064B01D2239/086B01D2253/102B01D2253/104B01D2253/11B01D2257/2064B01D39/2065B01D39/14
InventorHONDA, KATSUHISAOHUCHI, MUNEKIYAMASHITA, MASAZUMINAKAMURA, HIROFUMIKAJIKAWA, OSAMUKAJIKAWA, TOSHIKOFUJII, TAKATOMO
OwnerMIURA COMPANY LIMITED