JP2002148251A - Alternate index matter for evaluating resolvability of coplanar pcbs and resolvability evaluating method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide alternate index matter capable of sizing catalyst towers for treating exhaust gases and managing the daily performance of the catalyst towers in refuse incinerating facilities, etc., and evaluating resolvability instead of Co-PCBs for the purpose of evaluating activities in the selection and development of catalysts. SOLUTION: The alternate index matter for evaluating the resolvability of coplanar PCBs is selected from a group of (1) a compound which is a derivative of benzene and comprises an oxygenated substitute and/or a nitrogenated substitute to be linked with a benzene ring, (2) an aromatic compound selected from a group of biphenyl, diphenyl ether, dibenzofuran, and dibenzodioxin, (3) a compound which is derived from (2) the aromatic compound and comprises an oxygenated substitute and/or a nitrogenated substitute, and (4) a compound which comprises an halogen atom to be further linked with a benzene ring in the (1) and (3) and/or an alkyl group which may be substituted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a coplanar PCB.
Regarding alternative indicator substances for the evaluation of the degradability of
More specifically, the present invention relates to an indicator substance that can be used in place of coplanar PCBs in the design of exhaust gas treatment facilities in refuse incineration facilities and the like and the performance management of catalyst towers, and in the activity evaluation in the selection and development of catalysts.

[0002]

2. Description of the Related Art From January 15, 2000, polychlorodibenzoparadioxin (hereinafter referred to as dioxin) has been used as dioxins.
In addition to PCDDs and polychlorodibenzofurans (hereinafter referred to as "PCDFs"), laws and regulations that newly include coplanar PCBs (hereinafter referred to as "Co-PCBs") have been enforced in Japan. The proportion of Co-PCBs in the total toxic equivalents of dioxins in refuse incineration exhaust gas is generally as low as 10% or less, but the decomposition characteristics of Co-PCBs are not yet sufficiently understood as compared with PCDDs / DFs.

[0003] Conventionally, reaction analysis data for sizing of a catalyst tower in the treatment of exhaust gas in a waste incineration facility is as follows.
The measurement was performed mainly based on the analysis values of the method for quantifying dioxins according to JIS K0311. However, this method involves the use of dioxins directly, though in a trace amount, so that environmental safety considerations are indispensable. In addition, even if a high-performance device such as a high-resolution gas chromatograph mass spectrometer (GC-MS) is used, this method is difficult. It required a long analysis period of about a month.

[0004] Dioxins in exhaust gas generated from a recently improved waste incineration system (for example, a pyrolysis gasification and melting process) are 0.1 ng-TEQ / m.
^{Since the} concentration is as low as about ³ N, the degree of decomposition varies when the treatment is advanced in a cracking catalyst tower, and in some cases, the reaction analysis evaluation for catalyst tower sizing is hindered. The cause of this is the propagation of analysis errors due to the lower limit of quantification, and it is considered that the analysis accuracy when measuring trace amounts of dioxins is a potential problem behind this.

[0005] In view of the above problems in analytical technology and safety, it has been studied to use a substance exhibiting the same decomposition behavior as dioxins in a catalyst tower as an alternative indicator substance for dioxins. As such alternative indicator substances, chlorobenzenes such as monochlorobenzene and dichlorobenzene have been studied so far, but these substances are the same as actual exhaust gas from incinerators (hereinafter referred to as "actual exhaust gas"). Since the decomposability under a moisture atmosphere is far lower than that of dioxins, it is insufficient as an alternative indicator of decomposability.

[0006] Under such circumstances, with respect to Co-PCBs newly subject to laws and regulations, at present, no alternative degradable indicator substance has been found.

[0007]

SUMMARY OF THE INVENTION The present invention is directed to, for example, the purpose of sizing an exhaust gas treatment catalyst tower in a waste incineration facility or the like, managing the performance of the catalyst tower on a daily basis, and evaluating the activity in selecting or developing a catalyst. Therefore, an object of the present invention is to provide an alternative indicator substance capable of evaluating degradability instead of Co-PCBs.

[0008]

Means for Solving the Problems In order to solve the above problems, the invention according to claim 1 has the following (1) to (4):
(1) a derivative of benzene which has an oxygen-containing substituent and / or a nitrogen-containing substituent bonded to a benzene ring; and (2) an aromatic compound selected from the group consisting of biphenyl, diphenyl ether, dibenzofuran and dibenzodioxin. (3) a compound derived from the aromatic compound of the above (2), wherein the compound has an oxygen-containing substituent and / or a nitrogen-containing substituent, and (4) the compound of the above (1) and (3) Further selected from the group consisting of a compound having a halogen atom and / or an optionally substituted alkyl group bonded to a benzene ring,
It is an alternative indicator substance for evaluating the degradability of Co-PCBs.

According to the present invention, it is possible to evaluate the degradability of Co-PCBs by using an alternative indicator substance having low toxicity and high environmental safety without directly using Co-PCBs. Of the most toxic Co-PCBs
The safety of the environment and the persons involved in handling can be further improved compared to the case where the is used directly. Moreover, unlike conventional reaction analysis, in which dioxins and PCBs in exhaust gas are directly quantified, analysis can be performed with general-purpose measuring instruments without using high-precision instruments, and the analysis period is about one day. Because it can be significantly shortened compared to the past (about one month), it is possible to perform quick and appropriate monitoring at refuse incineration facilities, etc., and to greatly improve the speed of facility design and catalyst research and development. it can.

According to a second aspect of the present invention, there is provided an alternative indicator for evaluating the degradability of Co-PCBs, wherein the alternative indicator is used under the condition of a water concentration of 1 to 70% by volume. Features.

According to the present invention, by using the alternative indicator substance under the condition of a water concentration of 1 to 70% by volume, the alternative indicator substance is reduced to the same extent as the decomposition rate of Co-PCBs in actual exhaust gas containing moisture. As a result, the influence of measurement errors can be reduced, and the degradation can be evaluated in the presence of moisture closer to actual actual exhaust gas, so that its reliability is also high.

According to a third aspect of the present invention, there is provided a method of using the alternative indicator substance according to the first or second aspect.
This is a method for evaluating the degradability of o-PCBs.

According to the present invention, the degradability of Co-PCBs can be evaluated using an alternative indicator substance having low toxicity and high safety to the environment without directly using Co-PCBs. It has a similar effect.

According to a fourth aspect of the present invention, there is provided a method for evaluating the activity of a Co-PCBs decomposition catalyst using the alternative indicator substance according to the first or second aspect.

According to the present invention, it is possible to evaluate the degradability of Co-PCBs by using an alternative indicator when evaluating the decomposition activity in selecting or developing a Co-PCBs decomposition catalyst.

According to a fifth aspect of the present invention, there is provided a method for evaluating the activity of a Co-PCBs decomposition catalyst.
The catalyst is characterized by being a catalyst at least partially containing a catalytically active component containing vanadium oxide and / or tungsten oxide.

According to the present invention, by using a catalyst containing vanadium oxide and / or tungsten oxide as a catalytically active component, Co-PCBs are oxidatively decomposed to a sufficiently harmless level on a toxic equivalent (TEQ) basis. In addition, the alternative indicator substance can be decomposed to the same extent on a real concentration basis with high correlation with Co-PCBs, so that the activity of the Co-PCBs decomposition catalyst can be accurately evaluated.

According to a sixth aspect of the present invention, there is provided a method for evaluating the degradability of Co-PCBs in an exhaust gas treatment facility, characterized by using the alternative indicator substance according to the first or second aspect.

According to the present invention, for example, the degradability of Co-PCBs is evaluated and monitored with an alternative indicator substance in a scene such as the design of an exhaust gas treatment facility in a refuse incineration facility or the like, and the maintenance and management of the performance of a catalyst tower. It becomes possible.

The invention according to claim 7 provides the following (1) to
(4): (1) a derivative of benzene which has an oxygen-containing substituent and / or a nitrogen-containing substituent bonded to a benzene ring, and (2) selected from the group consisting of biphenyl, diphenyl ether, dibenzofuran and dibenzodioxin. (3) a compound derived from the aromatic compound of the above (2), wherein the compound has an oxygen-containing substituent and / or a nitrogen-containing substituent, and (4) the above (1) and (4) In 3), it is an alternative indicator substance for evaluating the catalytic activity of decomposing Co-PCBs selected from the group consisting of compounds having a halogen atom bonded to a benzene ring and / or an alkyl group which may be substituted.

According to the present invention, similarly to the invention described in claim 4, in the selection and development of a Co-PCBs decomposition catalyst, it is possible to evaluate the degradability of Co-PCBs by using an alternative indicator substance.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION An alternative indicator substance for evaluating the degradability of Co-PCBs of the present invention (hereinafter simply referred to as "indicator substance")
Are the following (1) to (4): (1) a derivative of benzene, a compound having an oxygen-containing substituent and / or a nitrogen-containing substituent bonded to a benzene ring, (2) biphenyl, diphenyl ether, dibenzofuran And (3) a compound derived from the aromatic compound of (2), wherein the compound has an oxygen-containing substituent and / or a nitrogen-containing substituent, and ( 4) In (1) and (3) above, a halogen atom bonded to a benzene ring and / or
Or a compound having an optionally substituted alkyl group. These are known compounds or compounds that can be easily derived from known compounds.

Here, the term "oxygen-containing substituent" means, for example,
It means a functional group containing an oxygen atom in the group, such as a hydroxyl group, an aldehyde group (that is, a group having a carbonyl group), a carboxyl group or a group derived from esters thereof. The term "nitrogen-containing substituent" means a functional group containing a nitrogen atom in the group, such as an amino group. Further, in the "optionally substituted alkyl group", the term "optionally substituted" means that the group is unsubstituted or has a further substituent in the group, Such “further substituents” include, for example, halogen atoms.

As the indicator substance of the present invention, the following general formulas (I) to (V):

[0025]

Embedded image [Wherein, R represents an alkyl group which may be substituted,
X represents a halogen atom; Y represents a hydroxyl group, an optionally substituted alkoxy group, an optionally substituted amino group, an optionally substituted aldehyde group (carbonyl group), or a carboxyl group or an ester thereof. Which represents a group represented by the following formula:
When a plurality of Xs or a plurality of Ys are present, they may mean different contents, respectively.
p9, q1 to q5 and r1 to r9 are numbers representing the number of substitutions on the benzene ring, and p1, q1 and r1 are each 0 to 6 within a range not exceeding the number of substitutions on each ring.
And p2 to p5, q2 to q5 and r2 to r5 mean numbers from 0 to 5, respectively, and p6 to p9 and r6 to r9 mean numbers from 0 to 4, respectively. Where q in the formula (I)
When 1 is 1 or more, r1 is 1 or more,
When q2 or q3 in the formula (II) is 1 or more, one of r2 and r3 is 1 or more.], And at least one compound selected from the group of compounds represented by the formula:

In the formulas (I) to (V), “optionally substituted alkoxy group”, “optionally substituted amino group”, “optionally substituted aldehyde group”, “substituted In the "optionally substituted alkyl group", the term "optionally substituted" has the same meaning as described above, and examples of the further substituent include an alkyl group and a halogen atom.

In the formulas (I) to (V), when the alkyl group represented by R or the substituent represented by Y is an alkoxy group, or when Y has an alkyl group, the alkyl group Alternatively, the alkoxy group preferably has about 1 to 4 carbon atoms.

Further, the compound represented by the formula (I) must have at least one or more Y in the molecule.
R1 in the formula (I) is 1 or more].

Particularly preferred examples of the indicator substance of the present invention are as follows.

Examples of the benzene derivative having an oxygen-containing substituent bonded to the benzene ring include:
Phenol, catechol, resorcin, hydroquinone,
Phenols such as pyrogallol and phloroglucin; alkoxybenzenes such as anisole, ethoxybenzene and dimethoxybenzene; phenol esters such as phenyl acetate; benzoic acid and its alkyl esters (eg:
Methyl benzoate) and the like.

Examples of the benzene derivative having a nitrogen-containing substituent bonded to a benzene ring include:
Examples thereof include aminobenzenes such as aniline, o-, m- or p-diaminobenzene, and hydroxyanilines such as o-, m- or p-hydroxyaniline.

Further, these benzene derivatives may further include, for example, a halogen atom (eg, a chlorine atom, a bromine atom, a fluorine atom, or an iodine atom) or an alkyl group (preferably, an atom or a substituent bonded to a benzene ring). , A methyl group, an ethyl group or the like alkyl group having 1 to 4 carbon atoms), and specific examples of such compounds include o
-, M- or p-chlorophenol, 2,3-dichlorophenol, 2,4,6-trichlorophenol, other chlorophenols, bromophenols such as o-, m- or p-bromophenol, o-, m- or p-
Fluorophenols such as fluorophenol, o-,
halophenols including iodophenols such as m- or p-iodophenol; haloanisols such as o-, m- or p-chloroanisole; halobenzos such as o-, m- or p-chlorobenzoic acid Acids and alkyl esters thereof; esters of halophenols such as o-, m- or p-chloroacetate; haloaminobenzenes such as o-, m- or p-chloroaniline;
-, M- or p-cresol, xylenol, alkylphenols such as carvacrol and the like.

Particularly preferred compounds are aromatic compounds such as biphenyl, diphenyl ether, dibenzofuran, and dibenzodioxin, and compounds derived from these aromatic compounds, and the same oxygen-containing compounds as in the case of the benzene derivative. Examples of the compound include a compound having a substituent and / or a nitrogen-containing substituent, and a compound having the same halogen atom or alkyl group as in the case of the benzene derivative.

Further, it is preferable that the indicator substance having a large amount in the exhaust gas or a substance having a high volatility be more easily analyzed by a gas chromatograph or the like. In general, a compound having a low molecular weight tends to be present more in exhaust gas and has high volatility. Therefore, the molecular weight of the indicator substance is preferably 350 or less, particularly preferably about 93 to 200. From such a viewpoint, among the above substances, o-chlorophenol, biphenyl, dibenzo-p-dioxin, dibenzofuran, diphenyl ether, aniline,
Anisole, ethoxybenzene, phenyl acetate, and methyl benzoate are the most desirable indicators.

The indicator substance of the present invention can be used as an alternative indicator of decomposability irrespective of the type of the decomposition catalyst for Co-PCBs.
It can also be used advantageously as an alternative indicator substance for evaluating the catalytic activity of cracking catalysts for industrial use.

As a preferable decomposition catalyst for Co-PCBs in combination with the indicator substance of the present invention, a catalytically active component containing vanadium oxide and / or tungsten oxide (including these composite oxides) is at least partially contained. Contains at least partially the active catalyst containing at least one of chromium oxide, cobalt oxide, iron oxide, copper oxide and manganese oxide (including these composite oxides) Can be exemplified. Using these catalysts, Co-PCBs
Can be sufficiently oxidatively decomposed to a harmless level on the basis of toxic equivalents (TEQ), and under the high correlation with Co-PCBs, the alternative indicator can be decomposed to the same extent on an actual concentration basis, so that Co- It becomes possible to evaluate the decomposability of PCBs and the activity of the catalyst.

The catalyst is preferably a mixture of titanium oxide in addition to the catalytically active component, or a catalyst in which the catalytically active component is supported on titanium oxide. here,
Examples of the titanium oxide include titanium dioxide of anatase type, rutile type and the like. This titanium oxide mainly plays a role as a catalyst carrier in maintaining the structure such as securing pores and specific surface area of the catalyst and assisting dispersion of the catalytically active component on the catalyst surface.

Among the above-mentioned catalysts, catalysts containing at least partially a catalytically active component containing vanadium oxide and / or tungsten oxide are more preferable from the viewpoint of high decomposability to Co-PCBs and substitute indicator substances. . Here, examples of the vanadium oxide include divanadium pentoxide, vanadium dioxide, and divanadium trioxide, and examples of the tungsten oxide include tungsten trioxide.

More specifically, vanadium oxide is contained in the catalyst in an amount of 0.01 to 30% by weight, preferably 1 to 30% by weight of the total weight of the catalyst.
And / or 0.01 to 30% by weight, preferably 1 to 30% by weight of the total weight of the catalyst.
Those containing 0 to 20% by weight are desirable.

The characteristics of the catalyst include, for example, a specific surface area of 30 m ² / g or more, preferably 45 m ² / g or more, more preferably 80 m ² / g or more.
For example, the pore volume is at least 0.2 cm ³ / g or more,
Preferably, it is 0.3 cm ³ / g or more. The upper limit of the specific surface area and the pore volume can be set within a range that can be manufactured, but the upper limit of the specific surface area is about 1000 m ² / g, and the upper limit of the pore volume is 0.6 cm ³ / G is preferred.

The outer shape of the catalyst is not particularly limited.
For example, a packed layer of catalyst particles such as granules, columns, and cylinders, and a honeycomb-shaped column / square column molded product are used.

Co-PCB using the indicator substance of the present invention
Preferred conditions for evaluating the decomposability of s are as follows.

The evaluation of the decomposability of Co-PCBs by the indicator substance of the present invention is performed under the condition that 1 to 70% by volume, more preferably 5 to 50% by volume of water is present in the exhaust gas. Can be expected. The reason for this is that, as shown in the examples below, the indicator substance of the present invention has the property that the decomposition rate is improved to the same level as Co-PCBs in the presence of moisture, so that the absolute value of the decomposition rate is large. This is because the influence of the measurement error can be reduced. Also,
In actual exhaust gas discharged from refuse incinerators, etc., 5-50
Since it usually contains about volume% of water,
When replacing the decomposability of Co-PCBs in actual exhaust gas, it is a great advantage that it can be performed in the presence of the same amount of water.

The oxygen concentration when using the indicator substance of the present invention is preferably about 1 to 50% by volume, more preferably about 5 to 15% by volume. The reason is that catalytic oxidative decomposition requires the supply of oxygen, and
Generally, since the oxygen concentration in the actual exhaust gas generated from the refuse incinerator is about 5 to 10% by volume, in order to evaluate the catalytic activity in the same atmosphere as the actual exhaust gas, it is necessary to use This is because the oxygen concentration should be closer to the oxygen concentration in the actual exhaust gas.

Degradability evaluation using the indicator substance of the present invention can be performed under the same conditions as those for the decomposition treatment of Co-PCBs and dioxins.
It can be carried out at a space velocity (SV) of about 10 ° C, preferably 140 to 260 ° C; about 400 to 100,000 / hr, preferably about 800 to 5,000 / hr.

The measurement of the indicator substance of the present invention is performed using a general-purpose GC-F
It can be performed by a device such as ID and GC-MS.
Since the suitable concentration range of the indicator substance varies depending on the quantitative method used for the measurement, the lower limit is generally set so that the residual amount after the decomposition test is equal to or more than the lower limit of quantification of the quantitative method.

According to the indicator substance of the present invention, Co-PCBs
When evaluating the decomposability of, for example, if the target is real exhaust gas, the exhaust gas is collected at the inlet and outlet of the catalyst tower,
The concentration of the indicator substance contained therein may be measured, and the decomposition rate of Co-PCBs may be calculated based on the correlation between the decomposition rate of the substance and the decomposition rate of Co-PCBs. In this case, the indicator substance originally present in the exhaust gas may be measured, but it is also possible to add an indicator substance not present in the exhaust gas so as to have a constant concentration for the measurement.

Similarly, the indicator substance of the present invention provides Co-
When the activity of the catalyst for decomposing PCBs is evaluated, for example, a gas containing a certain concentration of the indicator substance is treated in a catalyst test apparatus, the concentration of the indicator substance before and after the treatment is measured, and the decomposition rate of the substance and the Co- The decomposition activity of the catalyst may be evaluated based on the correlation with the decomposition rate of PCBs.

As an example to which the method for evaluating the degradability of Co-PCBs of the present invention can be applied, an outline of a waste incineration plant is shown in FIG.

[0050]

EXAMPLES Hereinafter, the present invention will be described in more detail by way of examples, but the present invention is not limited thereto. Example 1 (1) Measurement of actual exhaust gas: A part of the actual exhaust gas from a refuse incineration facility was branched at the outlet of a dust collection facility, guided to a catalyst tower, and sampled at each SV position. The experimental condition was a processing gas amount of 740 m ^3.
N / h, temperature 200 ° C, SV1600 to 6400hr
^-1 , NH ₃ / NO ratio is 0.7, and the other composition of the actual exhaust gas is O ₂ ; 6% by volume, CO ₂ ; 6% by volume, N ₂ ;
7% by volume, water content: 30% by volume. Co-PCBs
Was analyzed according to JIS K0311. The following catalysts were used. <VW / Ti-based catalyst> Active ingredient composition: Vanadium pentoxide 4%, tungsten trioxide 14% Carrier: Titanium oxide Shape: Square lattice honeycomb type Outside dimensions: 150 mm ^□ × 520 mm (2) Decomposition by indicator substance Characterization and investigation of decomposition mechanism: Biphenyl (BP), dibenzofuran (DBF), o-
The degradation characteristics of chlorophenol (o-CP) and diphenyl ether (DPE) were tested and evaluated together with the influence of the presence or absence of a moisture atmosphere. As a comparative example, the same test was performed for monochlorobenzene (MCB) and m-dichlorobenzene (m-DCB).

The test was carried out in a fixed bed small flow type catalyst test apparatus (catalyst amount: 15 to 30 cc). The catalyst used was a honeycomb catalyst having the same composition as in the actual gas test.
V3000 hr ^-1 , reaction temperature 200 ° C., gas composition: indicator substance concentration 300 ppm, NO 100 ppm, NH ₃
The concentration was 100 ppm, oxygen 10% by volume, and nitrogen (balance), and the water concentration was set to 0% by volume or 35% by volume.
The sampling of the indicator substance is performed by the solvent collection method, and the quantitative analysis is performed by GC.
-Performed with FID. (3) Results: MCB, m-DCB, BP, DBF, o-CP, in an atmosphere of 0% by volume and 35% by volume of moisture.
FIG. 1 shows a comparison between the degradability of DPE and that of Co-PCBs.
Shown in For Co-PCBs, the toxic equivalent (TE
Q) and the decomposition rate of the measured concentration are shown.

From FIG. 1, the decomposition characteristics of BP depending on the presence or absence of moisture show a behavior in contrast to m-DCB and MCB.
35% by volume rather than 50% by volume in a moisture atmosphere
The decomposition rate in a water atmosphere was 85%, indicating that the decomposition was higher in a water atmosphere. Similarly, o-CP, DPE and DBF also had higher decomposition rates under the condition of 35% by volume of water. That is, under an atmosphere condition equivalent to 35% by volume of water, BP or o-CP, DPE, and DBF are closer to the absolute value of the decomposition rate of the toxic equivalent of Co-PCBs than chlorobenzenes such as MCB and m-DCB. Values. Considering that the actual exhaust gas from the refuse incinerator contains tens of volume% of water,
-As an alternative indicator substance closer to the decomposition behavior of PCBs toxicity equivalent amount, BP or o-C belonging to the alternative indicator substance of the present invention is more preferable than chlorobenzenes such as MCB and m-DCB.
Oxygen-containing aromatic compounds such as P, DPE and DBF have been shown to be suitable.

FIG. 2 shows Co-PCBs obtained by an actual gas test.
Decomposition rate (based on actual concentration) for each chlorine valence. Here, heptavalent Co-PCBs are the highest (about 100%),
The pentavalent Co-PCBs showed the lowest degradation rate (about 39%), with a difference of about 60%. The figure also shows the decomposition rate of the most toxic 33'44'5-P5CB on the basis of the actual concentration and the decomposition rate of all Co-PCBs on the basis of TEQ. 33'44'5-P5CB is pentavalent Co-P
Despite being CB, the decomposition rate was significantly higher.
In general, in the case of PCDDs / DFs, the larger the chlorine valence, the more likely it is to be decomposed, but in the case of Co-PCBs, no particular tendency due to the magnitude of the chlorine valence was observed. FIG. 2 shows the decomposition rate of the whole pentavalent Co-PCBs and 3
Although the decomposition rate of 3'44'5-P5CB is shown, it can be seen that the decomposition rate is greatly different for each isomer within the same valence.

FIG. 1 shows the actual concentration of Co-PCBs.
Despite the low decomposition rate of 60.9%, TEQ
The reason why the decomposition rate on the base is as high as 99.5% is that, as shown in FIG. 2, the toxic equivalent coefficient (TEF) is particularly high as compared with each of the other species of Co-PCBs. −
This is considered to be because the decomposition rate of 33'44'5-P5CB, which controls the decomposition rate of sulfur, is remarkably high.

As described above, the alternative indicator substance of the present invention (in this embodiment, BP, o-CP, DPE, D
BF) is useful as a substitute index for degradability of Co-PCBs because it exhibits degradability close to the decomposition rate of Co-PCBs toxic equivalents, and in particular, garbage incineration facilities that place the highest priority on ensuring environmental safety It is also excellent in practicality as an alternative index of degradability of Co-PCBs. And C
It can be said that this is the most suitable index for evaluating the degradability of 33'44'5-P5CB, which is the most toxic among the chemical species of o-PCBs.

[0056]

According to the present invention, it is possible to evaluate the degradability of Co-PCBs by using an alternative indicator substance having low toxicity and high environmental safety without using Co-PCBs directly. Co-PCBs with high toxicity among PCBs
The safety of the environment and the persons involved in handling can be further improved compared to the case where the is used directly. Moreover, unlike conventional reaction analysis using dioxins, analysis can be performed with a general-purpose measuring instrument without using high-precision instruments, and the analysis period is about one day, which is much longer than the conventional (about one month). For example, while monitoring the performance of exhaust gas treatment equipment at refuse incineration facilities, etc., it is possible to perform quick and appropriate monitoring, as well as to design facilities and select catalysts.
Since the speed of research and development can be greatly improved, the utility value is extremely high.

[Brief description of the drawings]

FIG. 1 is a graph showing the degradability of Co-PCBs and alternative indicator substances.

FIG. 2 is a graph showing the degradability of each chemical species of Co-PCBs.

FIG. 3 is a schematic diagram showing an example of a refuse incineration facility.

[Explanation of symbols]

 Reference Signs List 1 Waste incineration facility 2 Waste heat boiler 3 Water cooling / cooling tower 4 Dust collection equipment 5 Catalytic reaction tower 6 Blower 7 Exhaust tower A Gas sampling position at catalyst tower inlet B Gas sampling position at catalyst tower outlet

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Kazuyo Fujisawa No. 1 Yawata Kaigandori, Ichihara City, Chiba Prefecture Mitsui Engineering & Shipbuilding Co., Ltd. (72) Inventor Shinyasu Kanda No. 1 Yawata Kaigandori Ichihara City, Chiba Prefecture Mitsui Engineering & Shipbuilding Co., Ltd. (72) Inventor Makoto Yamamoto 1-Yawata Kaigandori, Ichihara-shi, Chiba Mitsui Engineering & Shipbuilding Co., Ltd.

Claims (7)

[Claims] 1. The following (1) to (4), (1) a compound of a benzene derivative having an oxygen-containing substituent and / or a nitrogen-containing substituent bonded to a benzene ring, (2) biphenyl, An aromatic compound selected from the group consisting of diphenyl ether, dibenzofuran and dibenzodioxin; (3) a compound derived from the aromatic compound of the above (2), wherein the compound has an oxygen-containing substituent and / or a nitrogen-containing substituent. And (4) In the above (1) and (3), a coplanar P selected from the group consisting of compounds further having a halogen atom bonded to a benzene ring and / or an optionally substituted alkyl group.
An alternative indicator substance for evaluating the degradability of CBs. 2. The substitute indicator substance for evaluating the degradability of coplanar PCBs according to claim 1, wherein the substitute indicator substance is used under a condition of a water concentration of 1 to 70% by volume. 3. A method for evaluating the degradability of coplanar PCBs, comprising using the alternative indicator substance according to claim 1 or 2. 4. A method for evaluating the activity of a coplanar PCB decomposition catalyst, comprising using the alternative indicator substance according to claim 1 or 2. 5. The activity of a coplanar PCB decomposition catalyst according to claim 4, wherein the catalyst is a catalyst at least partially containing a catalytically active component containing vanadium oxide and / or tungsten oxide. Evaluation method. 6. A method for evaluating the degradability of coplanar PCBs in an exhaust gas treatment facility, comprising using the alternative indicator substance according to claim 1 or 2. 7. A compound of the following (1) to (4), (1) a derivative of benzene, which has an oxygen-containing substituent and / or a nitrogen-containing substituent bonded to a benzene ring, (2) biphenyl, An aromatic compound selected from the group consisting of diphenyl ether, dibenzofuran and dibenzodioxin; (3) a compound derived from the aromatic compound of the above (2), wherein the compound has an oxygen-containing substituent and / or a nitrogen-containing substituent. And (4) In the above (1) and (3), a coplanar P selected from the group consisting of compounds further having a halogen atom bonded to a benzene ring and / or an optionally substituted alkyl group.
An alternative indicator substance for evaluating the catalytic activity of decomposition of CBs.