JP7184631B2 - Method for producing kerosene composition - Google Patents
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本発明は、灯油組成物の臭気の不快度判定方法、灯油組成物の品質管理方法及び灯油組成物の製造方法に関し、詳しくは、灯油組成物から発生する臭気の不快度を判定する方法、不快臭の少ない灯油組成物の品質管理方法及び製造方法に関する。 TECHNICAL FIELD The present invention relates to a method for determining the degree of unpleasantness of an odor of a kerosene composition, a method for quality control of a kerosene composition, and a method for producing a kerosene composition. The present invention relates to a quality control method and a production method for a kerosene composition with little odor.
灯油は、家庭用の暖房用燃料として広く使われているが、ストーブ、ファンヒーターへの給油等の灯油を取り扱う際に発生する臭気によって使用者が不快に感じる場合がある。 Kerosene is widely used as a fuel for household heating, but the odor generated when handling kerosene, such as refueling stoves and fan heaters, may make users feel uncomfortable.
そして、灯油は揮発成分を含んでいるため、従来は、常温で、揮発する灯油中の成分が、不快臭のもとであると考えられていた（特許文献１等）。 Since kerosene contains volatile components, it was conventionally thought that the components in kerosene that volatilize at room temperature were the source of the unpleasant odor (Patent Document 1, etc.).
そのため、従来は、灯油の不快臭を減らすには、揮発成分量をコントロールすることが重要であると考えられていた。 Therefore, it was conventionally considered important to control the amount of volatile components in order to reduce the unpleasant odor of kerosene.
ところが、本発明者らが、この灯油から生じる臭気の不快感について、鋭意検討を行ったところ、灯油の性状により、臭気を強く感じるものや、それほど強く臭気を感じないものがあるが、灯油の臭気の強さと、不快感とには、必ずしも相関がないことがわかった。 However, when the inventors of the present invention conducted an intensive study on the unpleasantness of the odor caused by kerosene, it was found that depending on the properties of kerosene, some odors are felt strongly and others do not feel so strongly. It was found that there is not necessarily a correlation between the strength of odor and discomfort.
そのため、灯油から生じる臭気の不快度を適切に判定する方法がなく、灯油から生じる不快臭が少ないという観点での品質管理が難しかった。また、不快臭の原因が不明確であったため、不快臭の少ない灯油を効率よく製造することが困難であった。 Therefore, there is no method for appropriately judging the degree of unpleasantness of kerosene-derived odors, and it has been difficult to perform quality control from the standpoint of reducing kerosene-derived unpleasant odors. In addition, since the cause of the unpleasant odor was unclear, it was difficult to efficiently produce kerosene with less unpleasant odor.
従って、本発明の目的は、灯油組成物の臭気の不快度を適切に判定する方法を提供することにある。また、本発明の目的は、灯油組成物から生じる不快臭が少ないという観点での品質管理を行うことができる灯油組成物の品質管理方法を提供することにある。また、本発明の目的は、不快臭の発生の少ない灯油を効率よく製造することができる灯油組成物の製造方法を提供することにある。 SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a method for properly determining the unpleasantness of the odor of a kerosene composition. Another object of the present invention is to provide a method for quality control of a kerosene composition, which enables quality control from the viewpoint that the kerosene composition has little unpleasant odor. Another object of the present invention is to provide a method for producing a kerosene composition that can efficiently produce kerosene with less unpleasant odor.
上記課題は、以下の本発明により解決される。
すなわち、本発明（１）は、品質評価対象の灯油組成物を、試験容器内に入れ、所定の品質評価温度で気液平衡状態にし、次いで、該試験容器内の気相を採取し、採取した気相中の硫化水素濃度を測定する気相硫化水素濃度測定工程と、
該気相中の硫化水素濃度により、該品質評価対象の灯油組成物の不快度を判定する不快度判定工程と、
を有することを特徴とする灯油組成物の臭気の不快度判定方法を提供するものである。
The above problems are solved by the present invention described below.
That is, in the present invention (1), a kerosene composition to be subjected to quality evaluation is placed in a test container, brought to a gas-liquid equilibrium state at a predetermined quality evaluation temperature, and then the gas phase in the test container is collected and collected. a gas phase hydrogen sulfide concentration measuring step of measuring the hydrogen sulfide concentration in the gas phase;
a discomfort level determination step of determining the level of discomfort of the kerosene composition subject to quality evaluation based on the concentration of hydrogen sulfide in the gas phase;
To provide a method for determining the unpleasantness of the odor of a kerosene composition characterized by having
また、本発明（２）は、前記気相硫化水素濃度測定工程において、硫化水素ガス検知管を用いて、前記試験容器内の気相を採取すると共に、採取した気相中の硫化水素濃度を測定することを特徴とする（１）の灯油組成物の臭気の不快度判定方法を提供するものである。 In the present invention (2), in the gas phase hydrogen sulfide concentration measuring step, the gas phase in the test container is sampled using a hydrogen sulfide gas detector tube, and the hydrogen sulfide concentration in the sampled gas phase is measured. The object of the present invention is to provide a method for judging the unpleasantness of the odor of a kerosene composition according to (1), characterized by measuring the odor.
また、本発明（３）は、品質評価対象の灯油組成物を、試験容器内に入れ、所定の品質評価温度で気液平衡状態にし、次いで、該試験容器内の気相を採取し、採取した気相中の硫化水素濃度を測定する気相硫化水素濃度測定工程と、
該品質評価対象の灯油組成物の臭気の不快感の有無を該気相中の硫化水素濃度により判断する工程であり、該気相中の硫化水素濃度が所定の合格基準値以下であった場合には、該品質評価対象の灯油組成物を合格品とし、該気相中の硫化水素濃度が所定の合格基準値を超えていた場合には、該品質評価対象の灯油組成物を不合格品とする品質評価工程と、
を有することを特徴とする灯油組成物の品質管理方法を提供するものである。
Further, according to the present invention (3), a kerosene composition to be evaluated for quality is placed in a test container, brought to a gas-liquid equilibrium state at a predetermined quality evaluation temperature, and then the gas phase in the test container is collected and collected. a gas phase hydrogen sulfide concentration measuring step of measuring the hydrogen sulfide concentration in the gas phase;
It is a step of judging whether or not the kerosene composition to be evaluated for quality has an unpleasant odor based on the hydrogen sulfide concentration in the gas phase, and when the hydrogen sulfide concentration in the gas phase is equal to or less than a predetermined acceptance standard value. , the kerosene composition subject to the quality evaluation is regarded as a passing product, and if the concentration of hydrogen sulfide in the gas phase exceeds a predetermined acceptance standard value, the kerosene composition subject to the quality evaluation is a disqualified product A quality evaluation process to
To provide a quality control method for a kerosene composition characterized by having
また、本発明（４）は、前記気相硫化水素濃度測定工程において、硫化水素ガス検知管を用いて、前記試験容器内の気相を採取すると共に、採取した気相中の硫化水素濃度を測定することを特徴とする（３）の灯油組成物の品質管理方法を提供するものである。 In the present invention (4), in the gas phase hydrogen sulfide concentration measuring step, the gas phase in the test container is sampled using a hydrogen sulfide gas detector tube, and the hydrogen sulfide concentration in the sample gas phase is measured. A method for quality control of a kerosene composition according to (3), characterized by measuring.
また、本発明（５）は、前記気相硫化水素濃度測定工程及び前記品質評価工程を行い、気相中の硫化水素濃度が所定の合格基準値以下と判断された灯油組成物と同一ロットの灯油組成物を合格品として出荷することを特徴とする（３）又は（４）いずれかの灯油組成物の品質管理方法を提供するものである。 In addition, the present invention (5) performs the gas phase hydrogen sulfide concentration measurement step and the quality evaluation step, and the same lot as the kerosene composition for which the hydrogen sulfide concentration in the gas phase is determined to be equal to or less than a predetermined acceptance standard value. A quality control method for a kerosene composition according to (3) or (4), characterized in that the kerosene composition is shipped as an acceptable product.
また、本発明（６）は、品質評価対象の灯油組成物を、試験容器内に入れ、所定の品質評価温度で気液平衡状態にし、次いで、該試験容器内の気相を採取し、採取した気相中の硫化水素濃度を測定する気相硫化水素濃度測定工程と、
該品質評価対象の灯油組成物の臭気の不快感の有無を該気相中の硫化水素濃度により判断する工程であり、該気相中の硫化水素濃度が所定の合格基準値以下であった場合には、該品質評価対象の灯油組成物を合格品とし、該気相中の硫化水素濃度が所定の合格基準値を超えていた場合には、該品質評価対象の灯油組成物を不合格品とする品質評価工程と、
該品質評価工程で不合格と判断された該品質評価対象の灯油組成物と同一ロットの灯油組成物（Ａ）に、該品質評価工程で不合格と判断された該品質評価対象の灯油組成物とは異なるロットの灯油組成物（Ｂ）を混合することにより、合格品を得る混合工程と、
を有することを特徴とする灯油組成物の製造方法を提供するものである。
Further, according to the present invention (6), a kerosene composition to be evaluated for quality is placed in a test container, brought to a gas-liquid equilibrium state at a predetermined quality evaluation temperature, and then the gas phase in the test container is collected and collected. a gas phase hydrogen sulfide concentration measuring step of measuring the hydrogen sulfide concentration in the gas phase;
It is a step of judging whether or not the kerosene composition to be evaluated for quality has an unpleasant odor based on the hydrogen sulfide concentration in the gas phase, and when the hydrogen sulfide concentration in the gas phase is equal to or less than a predetermined acceptance standard value. , the kerosene composition subject to the quality evaluation is regarded as a passing product, and if the concentration of hydrogen sulfide in the gas phase exceeds a predetermined acceptance standard value, the kerosene composition subject to the quality evaluation is a disqualified product A quality evaluation process to
The kerosene composition (A) of the same lot as the kerosene composition subject to quality evaluation that was determined to be unacceptable in the quality evaluation step, and the kerosene composition subject to quality evaluation that was determined to be unacceptable in the quality evaluation step. A mixing step of obtaining an acceptable product by mixing kerosene compositions (B) of different lots;
To provide a method for producing a kerosene composition characterized by having
また、本発明（７）は、前記気相硫化水素濃度測定工程において、硫化水素ガス検知管を用いて、前記試験容器内の気相を採取すると共に、採取した気相中の硫化水素濃度を測定することを特徴とする（６）の灯油組成物の製造方法を提供するものである。 Further, the present invention (7) is characterized in that, in the gas phase hydrogen sulfide concentration measuring step, the gas phase in the test container is sampled using a hydrogen sulfide gas detector tube, and the hydrogen sulfide concentration in the sample gas phase is measured. The method for producing a kerosene composition according to (6) is characterized by measuring.
本発明によれば、灯油組成物の臭気の不快度を適切に判定する方法を提供することができる。本発明によれば、灯油組成物から生じる不快臭が少ないという観点での品質管理を行うことができる灯油組成物の品質管理方法を提供することができる。また、本発明によれば、不快臭の発生の少ない灯油を効率よく製造することができる灯油組成物の製造方法を提供することができる。 According to the present invention, it is possible to provide a method for appropriately determining the unpleasantness of the odor of a kerosene composition. ADVANTAGE OF THE INVENTION According to this invention, the quality control method of the kerosene composition which can perform quality control from the viewpoint that the unpleasant smell which arises from a kerosene composition is little can be provided. In addition, according to the present invention, it is possible to provide a method for producing a kerosene composition that can efficiently produce kerosene with less unpleasant odor.
本発明の灯油組成物の臭気の不快度判定方法は、品質評価対象の灯油組成物を、試験容器内に入れ、所定の品質評価温度で気液平衡状態にし、次いで、該試験容器内の気相を採取し、採取した気相中の硫化水素濃度を測定する気相硫化水素濃度測定工程と、
該気相中の硫化水素濃度により、該品質評価対象の灯油組成物の不快度を判定する不快度判定工程と、
を有することを特徴とする灯油組成物の臭気の不快度判定方法である。
The method for determining the degree of unpleasantness of the odor of a kerosene composition of the present invention includes placing a kerosene composition to be evaluated for quality in a test container, bringing it to a gas-liquid equilibrium state at a predetermined quality evaluation temperature, and then a gas phase hydrogen sulfide concentration measuring step of sampling a phase and measuring the hydrogen sulfide concentration in the sampled gas phase;
a discomfort level determination step of determining the level of discomfort of the kerosene composition subject to quality evaluation based on the concentration of hydrogen sulfide in the gas phase;
A method for determining the unpleasantness of the odor of a kerosene composition, characterized by having
本発明の灯油組成物の臭気の不快度判定方法は、気相硫化水素濃度測定工程と、不快度判定工程と、を有する。 The method for determining the discomfort level of the odor of a kerosene composition according to the present invention includes a gas phase hydrogen sulfide concentration measurement step and a discomfort level determination step.
本発明の灯油組成物の臭気の不快度判定方法に係る気相硫化水素濃度測定工程では、先ず、品質評価対象の灯油組成物を、試験容器内に入れ、試験容器内の品質評価対象の灯油組成物を、所定の品質評価温度で気液平衡状態にする。 In the gas-phase hydrogen sulfide concentration measurement step according to the method for determining the unpleasantness of the odor of a kerosene composition of the present invention, first, the kerosene composition to be evaluated for quality is placed in a test container, and the kerosene to be evaluated for quality in the test container. The composition is brought to vapor-liquid equilibrium at the predetermined qualification temperature.
本発明の灯油組成物の臭気の不快度判定方法に係る気相硫化水素濃度測定工程において、品質評価対象となる灯油組成物は、特に制限されず、通常、石油精製プロセスにて生成する灯油組成物であればよい。品質評価対象の灯油組成物としては、例えば、ＪＩＳ Ｋ２２０３に規定の１号灯油又は２号灯油に相当する性状のものが挙げられる。品質評価対象の灯油組成物の物性値の例を挙げると、蒸留性状９５％流出温度が２１０～３００℃、引火点が４０～５０℃、銅版腐食（５０℃、３ｈ）が１以下、煙点が２３～２５．５、硫黄分が０．０００３～０．００８０質量％、密度が０．７８５０～０．７９５０である。また、灯油組成物が保管される場所の温度は、通常２０～３０℃程度である。また、灯油組成物が溶剤や洗浄剤等に使用される場合、使用環境の温度は、通常２０～３０℃程度である。 In the gas phase hydrogen sulfide concentration measurement step according to the method for determining the unpleasantness of the odor of a kerosene composition of the present invention, the kerosene composition to be evaluated for quality is not particularly limited, and is usually a kerosene composition produced in a petroleum refining process. Anything is fine. The kerosene composition to be evaluated for quality includes, for example, those having properties corresponding to No. 1 or No. 2 kerosene specified in JIS K2203. Examples of the physical property values of the kerosene composition to be evaluated for quality include: distillation property 95% outflow temperature 210 to 300 ° C., flash point 40 to 50 ° C., copper plate corrosion (50 ° C., 3 h) 1 or less, smoke point is 23 to 25.5, the sulfur content is 0.0003 to 0.0080% by mass, and the density is 0.7850 to 0.7950. The temperature of the place where the kerosene composition is stored is usually about 20-30°C. When the kerosene composition is used as a solvent or cleaning agent, the ambient temperature is usually about 20 to 30°C.
現在、灯油組成物中の硫化水素濃度については規制値がなく、人体に対して十分に無害な範囲まで制限されて市場に出荷されている。そして、硫化水素は、非常に少量であっても、不快臭に対して大きく影響を与えるため、人体に対して十分に安全な硫化水素濃度に管理されていても、不快臭に対して影響を与える濃度との観点からは、市場に出荷されている灯油組成物中の硫化水素濃度のバラツキ範囲は大きい。このようなことから、現在、市場に出荷されている灯油組成物には、不快に感じるものと不快に感じないものが混在する状態となっている。そのため、本発明では、不快臭に対して影響を与える硫化水素濃度との観点から、不快度を判定している。 At present, there is no regulation value for the concentration of hydrogen sulfide in kerosene compositions, and kerosene compositions are shipped to the market after being restricted to a range that is sufficiently harmless to the human body. Since even a very small amount of hydrogen sulfide has a large effect on unpleasant odors, even if the concentration of hydrogen sulfide is controlled to be sufficiently safe for the human body, it does not affect unpleasant odors. From the viewpoint of the concentration to be provided, there is a wide range of variation in the concentration of hydrogen sulfide in kerosene compositions on the market. For this reason, kerosene compositions currently on the market include a mixture of unpleasant and non-offensive kerosene compositions. Therefore, in the present invention, the degree of discomfort is determined from the viewpoint of the concentration of hydrogen sulfide, which affects the unpleasant odor.
品質評価対象となる灯油組成物が入れられる試験容器は、所定の品質評価温度で、灯油組成物の気液平衡状態を維持できるものであれば、特に制限されない。試験容器としては、例えば、灯油保管用のポリタンク、ねじ口瓶等が挙げられる。試験容器には、密閉可能な気相吸引口が設けられていることが好ましい。 The test vessel in which the kerosene composition to be subjected to quality evaluation is placed is not particularly limited as long as it can maintain the vapor-liquid equilibrium state of the kerosene composition at the predetermined quality evaluation temperature. Examples of the test container include a plastic tank for storing kerosene, a screw cap bottle, and the like. Preferably, the test vessel is provided with a sealable gas phase suction port.
本発明の灯油組成物の臭気の不快度判定方法に係る気相硫化水素濃度測定工程において、品質評価対象となる灯油組成物を、試験容器内で、気液平衡状態にするときの温度は、灯油組成物が取り扱われる場所の気温等の取り扱い温度に応じて設定される。灯油組成物が取り扱われる場所の取り扱い温度が非常に低い場合には、所定の品質評価温度は、その取り扱い温度に応じて低く設定され、また、灯油組成物が取り扱われる場所の取り扱い温度が比較的高い場合には、所定の品質評価温度は、その取り扱い温度に応じて高く設定される。例えば、灯油組成物の取り扱いが２５℃前後で行われる場合には、所定の品質評価温度を２５℃と設定する。また、例えば、出荷先での灯油組成物の保管及びストーブやファンヒーターへの給油が行われる場所の平均気温を２５℃と見積もる場合には、所定の品質評価温度を２０～３０℃の範囲内でいずれかの温度を選択し、所定の品質評価温度と設定する。 In the gas-phase hydrogen sulfide concentration measurement step according to the method for determining the unpleasantness of the odor of a kerosene composition of the present invention, the temperature at which the kerosene composition to be evaluated for quality is brought to a gas-liquid equilibrium state in the test vessel is It is set according to the handling temperature such as the temperature of the place where the kerosene composition is handled. If the handling temperature at the place where the kerosene composition is handled is very low, the predetermined quality evaluation temperature is set low according to the handling temperature, and the handling temperature at the place where the kerosene composition is handled is relatively low. If so, the predetermined quality assessment temperature is set higher according to the handling temperature. For example, when the kerosene composition is handled at around 25°C, the predetermined quality evaluation temperature is set at 25°C. In addition, for example, when estimating the average temperature of the place where the kerosene composition is stored at the shipping destination and where the stove and fan heater are refueled to be 25 ° C, the predetermined quality evaluation temperature is within the range of 20 to 30 ° C. to select one of the temperatures and set it as the predetermined quality evaluation temperature.
そして、本発明の灯油組成物の臭気の不快度判定方法に係る気相硫化水素濃度測定工程では、試験容器に、品質評価対象の灯油組成物を入れ、試験容器内で、品質評価対象の灯油組成物を、所定の品質評価温度において、気液平衡状態にする。試験容器内で品質評価対象の灯油組成物を気液平衡状態にする方法としては、特に制限されず、例えば、試験容器内に品質評価対象の灯油組成物を、所定の気相分の体積が残るような量入れ、密閉後、試験容器を所定の品質評価温度の場所にて放置して、試験容器内で、品質評価対象の灯油組成物を気液平衡状態にする方法や、所定の品質評価温度にされた試験容器に、所定の品質評価温度にされた品質評価対象の灯油組成物を、所定の気相分の体積が残るような量入れ、密閉後、試験容器を所定の品質管理温度に保持されている水浴に入れ、所定時間放置した後、試験容器を振とうさせる方法が挙げられる。所定の気相分の体積は、適宜選択される。なお、品質評価対象の灯油組成物の保存容器から、試験容器内に品質評価対象の灯油組成物を移す場合には、灯油組成物を移す方法としては、灯油組成物を移す際に、灯油組成物中の硫化水素の揮散が少ない方法ほど好ましい。 Then, in the gas-phase hydrogen sulfide concentration measurement step according to the method for determining the unpleasantness of the odor of a kerosene composition of the present invention, the kerosene composition to be evaluated for quality is placed in a test container, and the kerosene to be evaluated for quality is placed in the test container. The composition is brought to vapor-liquid equilibrium at the predetermined quality assessment temperature. The method for bringing the kerosene composition to be evaluated for quality into a gas-liquid equilibrium state in the test container is not particularly limited. After putting in an amount that remains and sealing, the test container is left at a predetermined quality evaluation temperature, and the kerosene composition to be evaluated for quality is brought to a gas-liquid equilibrium state in the test container. A kerosene composition subject to quality evaluation, which has been brought to a predetermined quality evaluation temperature, is placed in a test container set to an evaluation temperature in such an amount that a predetermined volume of the gas phase remains, and after sealing, the test container is subjected to a predetermined quality control. A method of placing the test container in a water bath maintained at a temperature and allowing it to stand for a predetermined period of time and then shaking the test container can be used. The volume of the predetermined gas phase is appropriately selected. When transferring the kerosene composition to be quality-evaluated from the storage container of the kerosene composition to be quality-evaluated into the test container, the method for transferring the kerosene composition is as follows: A method with less volatilization of hydrogen sulfide in the product is preferable.
本発明の灯油組成物の臭気の不快度判定方法に係る気相硫化水素濃度測定工程では、次いで、試験容器内の気相を採取し、採取した気相中の硫化水素濃度を測定する。試験容器内の気相を採取し、採取した気相中の硫化水素濃度を測定する方法としては、特に制限されず、例えば、チューブを用いて、ガスサンプリングバッグに試験容器内の気相を採取し、次いで、ガスサンプリングバッグ内の気相を、ＧＳ－ＳＣＤ（ガスクロマトグラフ－化学発光硫黄検出器）等の硫化水素の定量分析が可能な分析装置にて分析し、気相中の硫化水素濃度を測定する方法や、硫化水素ガス検知管を用いて、試験容器内の気相を吸引して採取すると同時に、検知管内の検知剤に気相を接触させて、気相中の硫化水素濃度を測定する方法が挙げられる。これらのうち、試験容器内の気相を採取し、採取した気相中の硫化水素濃度を測定する方法としては、硫化水素ガス検知管を用いて、試験容器内の気相を吸引して採取すると同時に、検知管内の検知剤に気相を接触させて、気相中の硫化水素濃度を測定する方法が、大型の分析装置を使用せず且つ試験容器の存在する場所で硫化水素濃度の測定が可能なので、簡便且つ迅速に気相中の硫化水素濃度を測定できる点で好ましい。硫化水素ガス採取器、検知管としては、特に制限されず、市販のものが適用可能である。硫化水素ガス検知管の規格としては、ＪＩＳ Ｋ ０８０４が挙げられる。 In the gas phase hydrogen sulfide concentration measurement step according to the method for determining the unpleasantness of the odor of the kerosene composition of the present invention, the gas phase in the test vessel is then sampled and the hydrogen sulfide concentration in the sampled gas phase is measured. The method for sampling the gas phase in the test container and measuring the hydrogen sulfide concentration in the sampled gas phase is not particularly limited. For example, using a tube, the gas phase in the test container is sampled into a gas sampling bag. Then, the gas phase in the gas sampling bag is analyzed with an analyzer capable of quantitative analysis of hydrogen sulfide such as GS-SCD (gas chromatograph-sulfur chemiluminescence detector), and the hydrogen sulfide concentration in the gas phase or using a hydrogen sulfide gas detector tube, the gas phase in the test container is aspirated and sampled, and at the same time, the gas phase is brought into contact with the detector agent in the detector tube to measure the hydrogen sulfide concentration in the gas phase. There is a method of measuring. Among these, the method of sampling the gas phase in the test container and measuring the hydrogen sulfide concentration in the sampled gas phase is to use a hydrogen sulfide gas detector tube to suck the gas phase in the test container and sample it. At the same time, a method of measuring the hydrogen sulfide concentration in the gas phase by contacting the gas phase with the detecting agent in the detection tube is a method that does not use a large analyzer and measures the hydrogen sulfide concentration at the location where the test container is present. is possible, it is preferable in that the concentration of hydrogen sulfide in the gas phase can be measured simply and quickly. The hydrogen sulfide gas sampler and detector tube are not particularly limited, and commercially available ones can be applied. JIS K 0804 is mentioned as a standard for hydrogen sulfide gas detector tubes.
本発明の灯油組成物の臭気の不快度判定方法に係る不快度判定工程は、気相硫化水素濃度測定工程を行い得られる気相中の硫化水素濃度の測定結果により、品質評価対象の灯油組成物の不快度を判定する工程である。 In the discomfort level determination step according to the method for determining the discomfort level of the odor of a kerosene composition of the present invention, the kerosene composition subject to quality evaluation is determined by the measurement result of the hydrogen sulfide concentration in the gas phase obtained by performing the gas phase hydrogen sulfide concentration measurement step. This is the step of determining the degree of discomfort of an object.
本発明の灯油組成物の品質管理方法に係る不快度判定工程では、予め定められている気相中の硫化水素濃度に対応する不快度尺度の値に基づいて、気相硫化水素濃度測定工程を行い得られる気相中の硫化水素濃度に対応する不快度尺度を決定し、品質評価対象の灯油組成物の不快度を判定する。例えば、表１に示すように、予め気相中の硫化水素濃度に対応する不快度尺度の値を定めておき、気相硫化水素濃度測定工程を行い得られる気相中の硫化水素濃度より、それに対応する不快度を決定する。 In the discomfort degree determination step according to the quality control method of the kerosene composition of the present invention, the gas phase hydrogen sulfide concentration measurement step is performed based on the predetermined discomfort scale value corresponding to the hydrogen sulfide concentration in the gas phase. An annoyance scale corresponding to the resulting hydrogen sulfide concentration in the gas phase is determined to determine the annoyance of the kerosene composition to be evaluated for quality. For example, as shown in Table 1, the value of the discomfort scale corresponding to the hydrogen sulfide concentration in the gas phase is determined in advance, and from the hydrogen sulfide concentration in the gas phase obtained by performing the gas phase hydrogen sulfide concentration measurement step, Determine the corresponding discomfort level.
なお、気相中の硫化水素濃度と不快度尺度との対応関係は、灯油組成物の取り扱われ方等、灯油組成物の用途に応じて設定される。 The relationship between the hydrogen sulfide concentration in the gas phase and the degree of discomfort scale is set according to the use of the kerosene composition, such as how the kerosene composition is handled.
本発明の灯油組成物の品質管理方法は、品質評価対象の灯油組成物を、試験容器内に入れ、所定の品質評価温度で気液平衡状態にし、次いで、該試験容器内の気相を採取し、採取した気相中の硫化水素濃度を測定する気相硫化水素濃度測定工程と、
該品質評価対象の灯油組成物の臭気の不快感の有無を該気相中の硫化水素濃度により判断する工程であって、該気相中の硫化水素濃度が所定の合格基準値以下であった場合には、該品質評価対象の灯油組成物を合格品とし、該気相中の硫化水素濃度が所定の合格基準値を超えていた場合には、該品質評価対象の灯油組成物を不合格品とする品質評価工程と、
を有することを特徴とする灯油組成物の品質管理方法である。
In the method for quality control of a kerosene composition of the present invention, a kerosene composition to be evaluated for quality is placed in a test container, brought to a gas-liquid equilibrium state at a predetermined quality evaluation temperature, and then the gas phase in the test container is sampled. and a gas phase hydrogen sulfide concentration measuring step of measuring the hydrogen sulfide concentration in the collected gas phase;
A step of judging whether or not the kerosene composition to be evaluated for quality has an unpleasant odor based on the concentration of hydrogen sulfide in the gas phase, wherein the concentration of hydrogen sulfide in the gas phase is equal to or less than a predetermined acceptance standard value. In this case, the kerosene composition subject to quality evaluation is regarded as a passing product, and if the concentration of hydrogen sulfide in the gas phase exceeds a predetermined acceptance standard value, the kerosene composition subject to quality evaluation is rejected. A quality evaluation process for quality,
A quality control method for a kerosene composition characterized by having
本発明の灯油組成物の品質管理方法は、気相硫化水素濃度測定工程と、品質評価工程とを有する。 The quality control method of the kerosene composition of the present invention has a gas phase hydrogen sulfide concentration measurement step and a quality evaluation step.
本発明の灯油組成物の品質管理方法に係る気相硫化水素濃度測定工程は、本発明の灯油組成物の臭気の不快度判定方法に係る気相硫化水素濃度測定工程と同様である。 The gas-phase hydrogen sulfide concentration measurement step in the method for quality control of a kerosene composition of the present invention is the same as the gas-phase hydrogen sulfide concentration measurement step in the method for determining the unpleasantness of odor of a kerosene composition of the present invention.
本発明の灯油組成物の品質管理方法に係る品質評価工程は、品質評価対象の灯油組成物の臭気の不快感の有無を該気相中の硫化水素濃度により判断する工程であり、気相中の硫化水素濃度が所定の合格基準値以下であった場合には、品質評価対象の灯油組成物を合格品とし、気相中の硫化水素濃度が所定の合格基準値を超えていた場合には、品質評価対象の灯油組成物を不合格品とする工程である。 The quality evaluation step according to the quality control method of the kerosene composition of the present invention is a step of judging whether or not the odor of the kerosene composition to be evaluated for quality is unpleasant based on the concentration of hydrogen sulfide in the gas phase. If the concentration of hydrogen sulfide in is below the specified acceptance standard value, the kerosene composition subject to quality evaluation is regarded as a passing product, and if the concentration of hydrogen sulfide in the gas phase exceeds the specified acceptance standard value , is a step of rejecting the kerosene composition subject to quality evaluation.
本発明の灯油組成物の品質管理方法に係る品質評価工程において、気相中の硫化水素濃度の合格基準値は、灯油組成物の取り扱われ方等、灯油組成物の用途に応じて設定される。例えば、家庭用ヒーターに使用される１号品の場合には、気相中の硫化水素濃度の合格基準値は比較的高めに設定され、また、溶剤や洗浄剤として使用される２号品の場合には、気相中の硫化水素濃度の合格基準値は比較的低めに設定される。 In the quality evaluation process according to the quality control method of the kerosene composition of the present invention, the acceptable standard value of hydrogen sulfide concentration in the gas phase is set according to the use of the kerosene composition, such as how the kerosene composition is handled. . For example, in the case of No. 1 product used for household heaters, the acceptable standard value for the concentration of hydrogen sulfide in the gas phase is set relatively high. In some cases, the acceptance criteria for the concentration of hydrogen sulfide in the gas phase are set relatively low.
本発明の灯油組成物の品質管理方法では、品質評価工程において合格品と判断された灯油組成物が、小口の保管容器（例えば、灯油保管用ポリタンク）から採取した灯油組成物であった場合に、品質評価対象とした灯油組成物が充填されていた小口の保管容器内の灯油組成物のみを合格品として出荷することができる。また、本発明の灯油組成物の品質管理方法では、品質評価工程において合格品と判断された灯油組成物が、小口の保管容器から採取した灯油組成物であった場合に、品質評価対象とした灯油組成物と同一ロットの灯油組成物を合格品として出荷することができる。また、本発明の灯油組成物の品質管理方法では、品質評価工程において合格品と判断された灯油組成物が、灯油組成物の貯蔵タンクから採取した灯油組成物であった場合に、品質評価対象とした灯油組成物と同一ロットの灯油組成物を合格品として出荷することができる。なお、品質評価対象の灯油組成物と同一ロットの灯油組成物とは、品質評価対象の灯油組成物が、貯蔵タンクに貯蔵されていたときに、品質評価対象の灯油組成物と一緒に貯蔵されていた貯蔵タンク内の灯油組成物を指す。 In the method for quality control of a kerosene composition of the present invention, when a kerosene composition determined to be a passing product in the quality evaluation process is a kerosene composition collected from a small storage container (for example, a polyethylene tank for kerosene storage), Only the kerosene composition in the small storage container filled with the kerosene composition subject to quality evaluation can be shipped as a passing product. In the method for quality control of a kerosene composition of the present invention, when a kerosene composition that has been determined to be an acceptable product in the quality evaluation process is a kerosene composition collected from a small storage container, it is subject to quality evaluation. A kerosene composition of the same lot as the kerosene composition can be shipped as a passing product. Further, in the method for quality control of a kerosene composition of the present invention, if the kerosene composition determined to be an acceptable product in the quality evaluation process is a kerosene composition collected from a kerosene composition storage tank, the quality evaluation subject A kerosene composition of the same lot as the kerosene composition of the above can be shipped as a passing product. The kerosene composition of the same lot as the kerosene composition subject to quality evaluation means that the kerosene composition subject to quality evaluation is stored together with the kerosene composition subject to quality evaluation when it is stored in the storage tank. refers to the kerosene composition in the storage tank that was
従来は、灯油組成物からの不快臭の原因が、灯油組成物の取り扱い時等に発生する揮発成分であると考えられていたので、灯油組成物の不快臭を減らすために、揮発成分量をコントロールして、臭気の強さをコントロールすることが必要であると考えられていた。しかし、本発明者らが、灯油組成物から生じる臭気の不快感について、鋭意検討を行ったところ、灯油組成物の性状により、臭気を強く感じるものや、それほど強く臭気を感じないものがあるが、灯油組成物の臭気の強さ、言い換えると、揮発成分量と、不快感とには、必ずしも相関がなく、気相に揮発する硫化水素の量が、灯油組成物から生じる臭気の不快感と、よく相関することを見出した。つまり、本発明者らは、灯油組成物から生じる揮発成分の大部分を占める揮発性の炭化水素ではなく、灯油組成物から生じる揮発成分に含まれる少量の硫化水素が不快臭の原因となっていることを見出した。 Conventionally, the cause of the unpleasant odor from kerosene compositions was thought to be volatile components generated during handling of kerosene compositions. It was considered necessary to control and control the intensity of the odor. However, when the inventors of the present invention conducted a thorough study on the discomfort caused by the odor caused by the kerosene composition, it was found that depending on the properties of the kerosene composition, some odors are felt strongly and others do not. , There is not necessarily a correlation between the strength of the odor of the kerosene composition, in other words, the amount of volatile components, and the discomfort, and the amount of hydrogen sulfide volatilized in the gas phase is the discomfort of the odor generated from the kerosene composition. , were found to correlate well. In other words, the present inventors believe that a small amount of hydrogen sulfide contained in the volatile components generated from the kerosene composition, rather than the volatile hydrocarbons that account for the majority of the volatile components generated from the kerosene composition, cause the unpleasant odor. I found out that there is
そして、本発明の灯油組成物の臭気の不快度判定方法及び本発明の灯油組成物の品質管理方法では、不快臭の発生に強く影響を与える気相中の硫化水素濃度に着目しているので、灯油組成物の臭気の不快度の判定及び不快臭が少ない灯油組成物の品質管理を適切に行うことができる。更に、本発明の灯油組成物の品質管理方法では、灯油組成物の取り扱い時の温度に応じて、品質評価温度を設定し、且つ、灯油組成物の用途に応じて、硫化水素濃度の合格基準を設定するので、灯油組成物の取り扱い温度や用途に応じた品質管理を行うことができる。 In the method for determining the unpleasantness of the odor of the kerosene composition of the present invention and the method for quality control of the kerosene composition of the present invention, attention is paid to the concentration of hydrogen sulfide in the gas phase, which strongly affects the generation of unpleasant odors. , determination of the unpleasantness of the odor of the kerosene composition and quality control of the kerosene composition with less unpleasant odor can be performed appropriately. Furthermore, in the quality control method of the kerosene composition of the present invention, the quality evaluation temperature is set according to the temperature at which the kerosene composition is handled, and the hydrogen sulfide concentration acceptance criteria are set according to the use of the kerosene composition. is set, quality control can be performed according to the handling temperature and application of the kerosene composition.
一方、灯油組成物の揮発成分量や蒸気圧の分析、液相の灯油組成物中の硫黄分含有量や硫化水素含有量の測定から、不快の度合を推測する方法では、実際に灯油組成物が取り扱われる状態で、使用者が不快と感じるか否かを判断することが困難である。 On the other hand, in the method of estimating the degree of discomfort from the analysis of the volatile component amount and vapor pressure of the kerosene composition, and the measurement of the sulfur content and hydrogen sulfide content in the liquid phase kerosene composition, the actual kerosene composition It is difficult to judge whether or not the user feels uncomfortable in the state of being handled.
本発明の灯油組成物の製造方法は、品質評価対象の灯油組成物を、試験容器内に入れ、所定の品質評価温度で気液平衡状態にし、次いで、該試験容器内の気相を採取し、採取した気相中の硫化水素濃度を測定する硫化水素濃度測定工程と、
該品質評価対象の灯油組成物の臭気の不快感の有無を該気相中の硫化水素濃度により判断する工程であり、該気相中の硫化水素濃度が所定の合格基準値以下であった場合には、該品質評価対象の灯油組成物を合格品とし、該気相中の硫化水素濃度が所定の合格基準値を超えていた場合には、該品質評価対象の灯油組成物を不合格品とする品質評価工程と、
該品質評価工程で不合格と判断された該品質評価対象の灯油組成物と同一ロットの灯油組成物（Ａ）に、該品質評価工程で不合格と判断された該品質評価対象の灯油組成物とは異なるロットの灯油組成物（Ｂ）を混合することにより、合格品を得る混合工程と、
を有することを特徴とする灯油組成物の製造方法である。
In the method for producing a kerosene composition of the present invention, a kerosene composition to be subjected to quality evaluation is placed in a test container, brought to a gas-liquid equilibrium state at a predetermined quality evaluation temperature, and then the gas phase in the test container is sampled. , a hydrogen sulfide concentration measuring step of measuring the hydrogen sulfide concentration in the collected gas phase;
It is a step of judging whether or not the kerosene composition to be evaluated for quality has an unpleasant odor based on the hydrogen sulfide concentration in the gas phase, and when the hydrogen sulfide concentration in the gas phase is equal to or less than a predetermined acceptance standard value. , the kerosene composition subject to the quality evaluation is regarded as a passing product, and if the concentration of hydrogen sulfide in the gas phase exceeds a predetermined acceptance standard value, the kerosene composition subject to the quality evaluation is a disqualified product A quality evaluation process to
The kerosene composition (A) of the same lot as the kerosene composition subject to quality evaluation that was determined to be unacceptable in the quality evaluation step, and the kerosene composition subject to quality evaluation that was determined to be unacceptable in the quality evaluation step. A mixing step of obtaining an acceptable product by mixing kerosene compositions (B) of different lots;
A method for producing a kerosene composition characterized by having
本発明の灯油組成物の製造方法に係る気相硫化水素濃度測定工程及び品質評価工程は、本発明の灯油組成物の品質管理方法に係る気相硫化水素濃度測定工程及び品質評価工程と同様である。 The gas phase hydrogen sulfide concentration measurement step and quality evaluation step in the method for producing a kerosene composition of the present invention are the same as the gas phase hydrogen sulfide concentration measurement step and quality evaluation step in the method for quality control of a kerosene composition of the present invention. be.
本発明の灯油組成物の製造方法に係る混合工程では、品質評価工程で不合格と判断された品質評価対象の灯油組成物と同一ロットの灯油組成物（Ａ）に、品質評価工程で不合格と判断された品質評価対象の灯油組成物とは異なるロットの灯油組成物（Ｂ）を混合することにより、合格品を得る工程である。 In the mixing step according to the method for producing a kerosene composition of the present invention, the kerosene composition (A) of the same lot as the kerosene composition to be evaluated for quality, which was determined to be rejected in the quality evaluation step, was disqualified in the quality evaluation step. It is a step of obtaining an acceptable product by mixing the kerosene composition (B) of a lot different from the kerosene composition to be evaluated for quality determined as above.
混合工程において、品質評価対象とした灯油組成物と同一ロットの灯油組成物（Ａ）とは、品質評価対象の灯油組成物が、貯蔵タンクに貯蔵されていたときに、品質評価対象の灯油組成物と一緒に貯蔵されていた貯蔵タンク内の灯油組成物を指す。また、品質評価対象とした灯油組成物とは異なるロットの灯油組成物（Ｂ）とは、（ｉ）品質評価対象の灯油組成物が貯蔵されていた貯蔵タンクとは別の貯蔵タンクに貯蔵されていた灯油組成物、又は（ｉｉ）品質評価対象の灯油組成物が貯蔵されていた貯蔵タンクと同一の貯蔵タンクに貯蔵されていたが、品質評価対象の灯油組成物とは一緒には貯蔵されていなかった灯油組成物を指す。 In the mixing process, the kerosene composition (A) of the same lot as the kerosene composition subject to quality evaluation is the kerosene composition subject to quality evaluation when the kerosene composition subject to quality evaluation is stored in the storage tank. Refers to the kerosene composition in the storage tank that was stored with the goods. In addition, the kerosene composition (B) of a lot different from the kerosene composition subject to quality evaluation is (i) stored in a storage tank different from the storage tank in which the kerosene composition subject to quality evaluation was stored. or (ii) was stored in the same storage tank in which the kerosene composition to be evaluated for quality was stored, but was not stored together with the kerosene composition to be evaluated for quality. It refers to kerosene compositions that were not
混合工程では、灯油組成物（Ａ）に灯油組成物（Ｂ）を混合することにより、合格品と判断される灯油組成物を得る。そのため、灯油組成物（Ｂ）としては、灯油組成物（Ａ）と同一の気相硫化水素濃度測定工程を行い気相中の硫化水素濃度を測定した場合に、気相中の硫化水素濃度が、灯油組成物（Ａ）の気相中の硫化水素濃度より低いものが用いられる。つまり、灯油組成物（Ｂ）を、灯油組成物（Ａ）と同一の気相硫化水素濃度測定工程を行い気相中の硫化水素濃度を測定した場合に、灯油組成物（Ｂ）の気相中の硫化水素濃度は、灯油組成物（Ａ）の気相中の硫化水素濃度より低い。 In the mixing step, the kerosene composition (B) is mixed with the kerosene composition (A) to obtain a kerosene composition judged to be an acceptable product. Therefore, for the kerosene composition (B), when the same gas phase hydrogen sulfide concentration measurement step as for the kerosene composition (A) is performed to measure the hydrogen sulfide concentration in the gas phase, the hydrogen sulfide concentration in the gas phase is , lower than the hydrogen sulfide concentration in the gas phase of the kerosene composition (A). That is, when the kerosene composition (B) is subjected to the same gas phase hydrogen sulfide concentration measurement step as the kerosene composition (A) and the hydrogen sulfide concentration in the gas phase is measured, the gas phase of the kerosene composition (B) The hydrogen sulfide concentration in the kerosene composition (A) is lower than the hydrogen sulfide concentration in the gas phase of the kerosene composition (A).
混合工程において、灯油組成物（Ａ）と灯油組成物（Ｂ）の混合割合は、灯油組成物（Ａ）及び灯油組成物（Ｂ）の気相硫化水素濃度測定工程における気相中の硫化水素濃度、合格品の合格基準値等により、適宜選択され、混合後の灯油組成物が合格品と判断されるように、灯油組成物（Ａ）と灯油組成物（Ｂ）の混合割合が選択される。 In the mixing step, the mixing ratio of the kerosene composition (A) and the kerosene composition (B) is the hydrogen sulfide in the gas phase in the gas phase hydrogen sulfide concentration measurement step of the kerosene composition (A) and the kerosene composition (B). The mixing ratio of the kerosene composition (A) and the kerosene composition (B) is selected so that the kerosene composition after mixing is judged to be an acceptable product. be.
本発明の灯油組成物の製造方法では、灯油組成物の取り扱い時の温度及び灯油組成物の用途に応じて、不快臭が発生するおそれのある灯油組成物のみを的確に選択し、不快臭が発生し難い灯油組成物と混合することにより、不快臭の発生が少ない灯油組成物を得ることができるので、不快臭の発生が少ない灯油を効率よく製造することができる。 In the method for producing a kerosene composition of the present invention, only kerosene compositions that are likely to generate an unpleasant odor are accurately selected according to the temperature at which the kerosene composition is handled and the application of the kerosene composition, and By mixing with a kerosene composition that does not easily generate a kerosene composition, it is possible to obtain a kerosene composition that generates less unpleasant odor, so that kerosene that generates less unpleasant odor can be efficiently produced.
以下に実施例を示して本発明を更に具体的に説明するが、本発明はこれに制限されるものではない。 EXAMPLES The present invention will be described in more detail with reference to examples below, but the present invention is not limited thereto.
（実施例）
＜試験対象灯油組成物＞
試験対象の灯油組成物として、試験対象灯油組成物Ａ～Ｇを用意した。
(Example)
<Kerosene composition to be tested>
Kerosene compositions A to G were prepared as kerosene compositions to be tested.
＜気液平衡状態の気相中の硫化水素濃度の測定＞
密閉可能な気相吸引口及び通気口が取り付けられている１Ｌの試験容器に、試験対象灯油組成物Ａを、空液比が１：１となるように張り込み、密閉した。次いで、試験容器を２５℃±１℃に保たれた水浴中で、少なくとも２時間放置した。
放置後、試験容器を３０秒間、激しく振とうさせ、振とうを止めた後、速やかに、気相吸引口に硫化水素ガス検知管を取り付け、試験容器内の気相を硫化水素ガス検知管内に導入し、硫化水素濃度を測定した。その結果を表２に示す。
また、試験対象灯油組成物Ｂ～Ｇについても、同様に行った。その結果を表２に示す。
<Measurement of hydrogen sulfide concentration in gas phase in gas-liquid equilibrium state>
Kerosene composition A to be tested was filled in a 1 L test container equipped with a sealable gas phase suction port and a vent port so that the air-to-liquid ratio was 1:1, and the container was sealed. The test containers were then placed in a water bath maintained at 25°C ± 1°C for at least 2 hours.
After standing, shake the test container vigorously for 30 seconds, and after stopping the shaking, quickly attach a hydrogen sulfide gas detector tube to the vapor phase suction port, and let the gas phase in the test container enter the hydrogen sulfide gas detector tube. The hydrogen sulfide concentration was measured. Table 2 shows the results.
In addition, the kerosene compositions B to G to be tested were also tested in the same manner. Table 2 shows the results.
＜試験対象灯油組成物の臭気強度及び不快度の評価＞
密閉可能な気相吸引口及び通気口が取り付けられている１Ｌの試験容器に、試験対象灯油組成物Ａを、空液比が１：１となるように張り込み、密閉した。同時に、密閉可能な気相吸引口及び通気口が取り付けられている１Ｌの試験容器に、表３に示す性状のリファレンス灯油組成物を、空液比が１：１となるように張り込み、密閉した。次いで、両試験容器を２５℃±１℃に保たれた水浴中に、少なくとも２時間放置した。
放置後、両試験容器を３０秒間、激しく振とうさせ、振とうを止めた後、速やかに、両試験容器の通気口を開け、試験対象灯油組成物Ａが入れられた試験容器の通気口に、鼻を近づけ、臭いをかぎ、臭気強度の評価を行った。また、リファレンス灯油組成物が入れられた試験容器の通気口と試験対象灯油組成物Ａが入れられた試験容器の通気口に、交互に鼻を近づけ、それぞれの臭いをかぎ、不快度の評価を行った。
上記評価試験を、被験者を変えて、表２に示す被験者人数分行った。その結果を表２に示す。
また、試験対象灯油組成物Ｂ～Ｇについても、同様に行った。その結果を表２に示す。
<Evaluation of odor intensity and discomfort level of kerosene composition to be tested>
Kerosene composition A to be tested was filled in a 1 L test container equipped with a sealable gas phase suction port and a vent port so that the air-to-liquid ratio was 1:1, and the container was sealed. At the same time, a reference kerosene composition having the properties shown in Table 3 was charged into a 1 L test container equipped with a sealable gas phase suction port and a vent so that the air-to-liquid ratio was 1:1, and the container was sealed. . Both test containers were then placed in a water bath maintained at 25°C ± 1°C for at least 2 hours.
After standing, both test containers were vigorously shaken for 30 seconds, and after the shaking was stopped, the vents of both test containers were quickly opened, and the vent of the test container containing the kerosene composition A to be tested was put into the vent. , the nose was brought close, the smell was smelled, and the odor intensity was evaluated. In addition, alternately bring your nose close to the vent of the test container containing the reference kerosene composition and the vent of the test container containing the kerosene composition A to be tested, sniff each smell, and evaluate the degree of discomfort. gone.
The above evaluation test was performed for the number of subjects shown in Table 2 with different subjects. Table 2 shows the results.
In addition, the kerosene compositions B to G to be tested were also tested in the same manner. Table 2 shows the results.
＜臭気強度の評価＞
「無臭」が「０点」、「やっと感知できる程度」が「１点」、「何の臭いかわかる弱い臭い」が「２点」、「楽に感知できる臭い」が「３点」、「強い臭い」が「４点」、「強烈な臭い」が「５点」との評価基準で行った。
<Evaluation of odor intensity>
"0 points" for "no smell", "1 point" for "barely perceivable", "2 points" for "a weak odor that can be detected", "3 points" for "easily perceivable", and "strong" The evaluation criteria were "4 points" for "smell" and "5 points" for "strong smell".
＜不快度の評価＞
リファレンス灯油組成物の不快度を「０」としたときに、リファレンス灯油組成物と比べ、「非常に不快」が「－３点」、「不快」が「－２点」、「やや不快」が「－１点」、「どちらでもない」が「０点」、「やや快」が「１点」、「快」が「２点」、「非常に快」が「３点」との評価基準で行った。
<Evaluation of discomfort>
When the discomfort level of the reference kerosene composition is set to "0", compared to the reference kerosene composition, "very uncomfortable" is "-3 points", "unpleasant" is "-2 points", and "somewhat unpleasant" is "-1 point", "Neither" is "0 points", "Slightly comfortable" is "1 point", "Comfortable" is "2 points", and "Very comfortable" is "3 points". I went with
上記結果に基づき、不快度と気相中の硫化水素濃度との関係を図１に、不快度と臭気強度との関係を図２に示す。その結果、図１に示すように、不快度と気相中の硫化水素濃度との間には、良い相関見られた。一方、図２に示すように、不快度と臭気強度との間には、相関があるとまでは言えない結果であった。 Based on the above results, the relationship between the degree of discomfort and the concentration of hydrogen sulfide in the gas phase is shown in FIG. 1, and the relationship between the degree of discomfort and odor intensity is shown in FIG. As a result, as shown in Fig. 1, a good correlation was found between the degree of discomfort and the concentration of hydrogen sulfide in the gas phase. On the other hand, as shown in FIG. 2, it cannot be said that there is a correlation between the discomfort level and the odor intensity.
Claims (2)
該品質評価対象の灯油組成物の臭気の不快感の有無を該気相中の硫化水素濃度により判断する工程であり、該気相中の硫化水素濃度が所定の合格基準値以下であった場合には、該品質評価対象の灯油組成物を合格品とし、該気相中の硫化水素濃度が所定の合格基準値を超えていた場合には、該品質評価対象の灯油組成物を不合格品とする品質評価工程と、
該品質評価工程で不合格と判断された該品質評価対象の灯油組成物と同一ロットの灯油組成物（Ａ）に、該品質評価工程で不合格と判断された該品質評価対象の灯油組成物とは異なるロットの灯油組成物（Ｂ）を混合することにより、合格品を得る混合工程と、
を有することを特徴とする灯油組成物の製造方法。 A kerosene composition to be evaluated for quality is placed in a test container, brought to a gas-liquid equilibrium state at a predetermined quality evaluation temperature, then the gas phase in the test container is sampled, and the hydrogen sulfide concentration in the sampled gas phase is measured. A gas phase hydrogen sulfide concentration measurement step to be measured;
It is a step of judging whether or not the kerosene composition to be evaluated for quality has an unpleasant odor based on the hydrogen sulfide concentration in the gas phase, and when the hydrogen sulfide concentration in the gas phase is equal to or less than a predetermined acceptance standard value. , the kerosene composition subject to the quality evaluation is regarded as a passing product, and if the concentration of hydrogen sulfide in the gas phase exceeds a predetermined acceptance standard value, the kerosene composition subject to the quality evaluation is a disqualified product A quality evaluation process to
The kerosene composition (A) of the same lot as the kerosene composition subject to quality evaluation that was determined to be unacceptable in the quality evaluation step, and the kerosene composition subject to quality evaluation that was determined to be unacceptable in the quality evaluation step. A mixing step of obtaining an acceptable product by mixing kerosene compositions (B) of different lots;
A method for producing a kerosene composition, comprising:
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| JP2007031512A (en) | 2005-07-25 | 2007-02-08 | Cosmo Oil Co Ltd | Kerosene composition |
| JP2008024840A (en) | 2006-07-21 | 2008-02-07 | Cosmo Oil Co Ltd | Kerosene composition |
| US20100307428A1 (en) | 2007-05-11 | 2010-12-09 | Christiane Behrendt | Fuel composition |
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| JP2007031512A (en) | 2005-07-25 | 2007-02-08 | Cosmo Oil Co Ltd | Kerosene composition |
| JP2008024840A (en) | 2006-07-21 | 2008-02-07 | Cosmo Oil Co Ltd | Kerosene composition |
| US20100307428A1 (en) | 2007-05-11 | 2010-12-09 | Christiane Behrendt | Fuel composition |
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