JP2634234B2 - Method for storing and transporting refined edible fats and oils - Google Patents
Method for storing and transporting refined edible fats and oilsInfo
- Publication number
- JP2634234B2 JP2634234B2 JP1095890A JP9589089A JP2634234B2 JP 2634234 B2 JP2634234 B2 JP 2634234B2 JP 1095890 A JP1095890 A JP 1095890A JP 9589089 A JP9589089 A JP 9589089A JP 2634234 B2 JP2634234 B2 JP 2634234B2
- Authority
- JP
- Japan
- Prior art keywords
- tank
- nitrogen gas
- oils
- refined
- fat
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23D—EDIBLE OILS OR FATS, e.g. MARGARINES, SHORTENINGS, COOKING OILS
- A23D9/00—Other edible oils or fats, e.g. shortenings, cooking oils
- A23D9/06—Preservation of finished products
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
- A23L3/00—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs
- A23L3/34—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by treatment with chemicals
- A23L3/3409—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by treatment with chemicals in the form of gases, e.g. fumigation; Compositions or apparatus therefor
- A23L3/3418—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by treatment with chemicals in the form of gases, e.g. fumigation; Compositions or apparatus therefor in a controlled atmosphere, e.g. partial vacuum, comprising only CO2, N2, O2 or H2O
Description
本発明は、品質の劣化が生じ難い精製食用油脂の貯蔵
及び輸送方法に関する。The present invention relates to a method for storing and transporting refined edible fats and oils that hardly causes deterioration in quality.
食用油脂を長期間貯蔵すると大気中の酸素との接触に
より品質の劣化が生じる。近年、精製された食用油脂の
流通は、国内だけに留まらず、タンカー等によって海外
から輸入されたり、逆に輸出されたりしている。従来
は、日本に於ける食用油脂の多くは、原料で輸入され、
国内で圧搾・抽出及び精製され、国内で消費されてい
た。ところが、油脂原料産出国の国策、或は輸送コスト
の対策の面で、産出国で食用油脂の精製まで行われ、日
本国内には精製されたものが輸入されることが多くなっ
てきている。 この輸出入に際して、タンカーへの油脂の積込み、積
込みの為の岸壁での油脂の備蓄、タンカーの航海、荷下
し、及び荷下しされた油脂の貯蔵等でかなりの時間が必
要となる。その時間は、扱われる油脂の単位量により差
はあるが、多くの場合、週単位の時間を必要とし、甚だ
しい場合、精製されてから使用されるまで半年も経過す
ることも珍しくない。 この間に、精製油脂は空気中の酸素によって酸化し、
精製油脂には過酸化物等が生成して過酸化物価が上昇す
る。これと同時に遊離脂肪酸も増加傾向を示し、これら
に伴って油脂は着色し、風味が低下し、精製油脂として
の価値がなくなる。例えば、飽和脂肪酸含量が高く比較
的安定な精製パーム油の場合でも、タンクに60℃で５日
間保存すると多くの場合、過酸化物価は1meq/kg以上に
上昇し、戻色して風味も低下する。この様な場合、使用
前に再精製を行う必要が生じ、最初の精製と同様な設備
及び経費を必要としていた。その為、精製食用油脂の貯
蔵及び輸送中の品質劣化の防止は、大きな課題であり、
種々の研究がなされている。 例えば、特開昭52−28505には、貯蔵中の品質安定化
の為に大豆油、菜種油に窒素ガスを含有させて容器に充
填する方法が教唆されている。この様に、精製油脂を窒
素ガスの雰囲気下で貯蔵及び輸送することによって、品
質劣化防止に果たす効果は多きものがある。 しかし、従来の窒素ガス雰囲気下での貯蔵及び輸送で
も、今だ完全に品質劣化を防止することができていな
い。例えば、従来の窒素ガス雰囲気下での貯蔵及び輸送
方法で15日以上間保存すると、過酸化物価は約0.5meq/k
g以上に上昇し、特に風味の低下による品質の低下が目
立ってくる。この様に、従来の大気下での貯蔵に較べ
て、品質の安定化には格段の進歩は見られるが、特に使
用する迄に長時間要する場合、品質が劣化し使用に耐え
なくなることが屡あり、その様な場合は再精製を余儀無
くされている。When edible fats and oils are stored for a long period of time, quality deteriorates due to contact with oxygen in the atmosphere. In recent years, the distribution of refined edible oils and fats is not limited to domestic ones, but is imported or exported from overseas by tankers or the like. Conventionally, many edible fats and oils in Japan are imported as raw materials,
It was squeezed, extracted and refined in Japan, and consumed in Japan. However, in terms of national policies for producing oil and fat raw materials or measures for transportation costs, edible oils and fats are refined in the producing countries, and refined products are increasingly imported into Japan. For this import and export, considerable time is required for loading the oils and fats into the tanker, storing the oils and fats on the quay for loading, navigating and unloading the tankers, and storing the unloaded oils and fats. The time varies depending on the unit amount of fats and oils to be handled, but in many cases, it requires a weekly time, and in extreme cases, it is not uncommon for half a year to elapse between refining and use. During this time, the refined fats and oils are oxidized by oxygen in the air,
Peroxide and the like are generated in the refined fat and oil, and the peroxide value increases. At the same time, the amount of free fatty acids also tends to increase, whereby the fats and oils are colored, the flavor is reduced and the value as refined fats and oils is lost. For example, even in the case of refined palm oil, which has a high saturated fatty acid content and is relatively stable, when stored in a tank at 60 ° C for 5 days, the peroxide value often rises to 1meq / kg or more, and the color returns and the flavor decreases. I do. In such a case, repurification must be performed before use, and the same equipment and cost as in the first purification were required. Therefore, prevention of quality degradation during storage and transportation of refined edible fats and oils is a major issue,
Various studies have been made. For example, Japanese Patent Application Laid-Open No. 52-28505 teaches a method of filling nitrogen into soybean oil or rapeseed oil into a container for stabilizing the quality during storage. As described above, storing and transporting the refined fats and oils in an atmosphere of nitrogen gas has many effects for preventing quality deterioration. However, even by conventional storage and transportation under a nitrogen gas atmosphere, quality deterioration has not yet been completely prevented. For example, when stored for 15 days or more by the conventional storage and transportation method under a nitrogen gas atmosphere, the peroxide value becomes about 0.5 meq / k
g or more, and the decrease in quality due to the decrease in flavor is particularly noticeable. As described above, there has been a remarkable progress in stabilizing the quality as compared with the conventional storage under the atmosphere, however, especially when it takes a long time to use, the quality often deteriorates and the product cannot withstand use. Yes, in such cases, re-purification is required.
そこで本発明が解決しようとする課題は、半月乃至半
年もの長期間にわたる貯蔵等を行っても再精製を必要と
しない程度に品質を安定保持する精製食用油脂の貯蔵及
び輸送方法を提供することにある。The problem to be solved by the present invention is to provide a method for storing and transporting refined edible oils and fats that stably maintains the quality to the extent that re-refining is not required even after long-term storage of half a month to half a year. is there.
前述の目的を達成するために、本発明者らは従来の窒
素ガス雰囲気下での貯蔵及び輸送方法について詳細に見
直しを行った。 従来の貯蔵及び輸送中の窒素ガスの封入方法では、殆
どの場合、雰囲気中の窒素濃度が97％以下で、高度に窒
素ガス置換が行われた場合でも99％程度にしか達してい
なかった。 これは食用油脂を精製後、その貯蔵及び輸送には精
製工場の貯蔵タンク、タンクローリー、船積み場の
備蓄タンク、タンカー、荷下しタンク基地の荷受タ
ンク、タンクローリー、使用工場の貯蔵タンク等に
順次積替えられているが、通常、この積替えの時に各タ
ンクには大気中の空気が入っている。その空気を充填す
る油脂で追い出しながら空間容量を小さくする。空間容
積は、タンク内の圧力制御の為に、全体の10％以上を確
保することが義務付けられている。しかる後に、10％以
上確保された空間部へ、窒素ガスを吹き込み、徐々に空
間部の窒素濃度の上昇を計る方法が採られている。しか
し、この窒素ガス置換には、多量の窒素ガスが必要で、
通常、空間部の４倍容量の窒素ガスを送り込んでも、空
間部の窒素ガス濃度は高々98％程度になるに過ぎない。
一方では、充填中の精製油脂が空間部の空気と接触して
いるので、空気中の酸素が油脂中に取り込まれ、溶解し
て、空間部が高濃度に窒素ガス置換が行われても精製油
脂中に溶解した酸素が油脂と反応し、精製油脂の劣化が
生じることが多い。 この充填時に、タンク内に存在する酸素の影響を抑え
る為、予めタンク内の空気を窒素ガスで置換してから油
脂を充填する方法も試みられた。しかし、この場合、置
換するに要する窒素ガスの量が、前述の10％程度の空間
部の置換と比べ莫大なものとなり、経費が上昇するの
で、多くの場合は、充填前にタンク中の気体を完全に窒
素ガスで置換する方法は採られていない。 この様な状況下で、食用油脂の品質劣化について種々
検討した結果、長期間品質を安定に保持する方法を見出
した。即ち、本発明は、貯蔵及び輸送用タンクに、窒素
ガスを過飽和量含有させた状態の精製食用油脂を導入す
ること、及び、該タンク内で精製食用油脂を保持するに
際し、タンク内の圧力を窒素ガスによって正圧に保つこ
と、によって、精製食用油脂を濃度99.5％以上の窒素ガ
ス雰囲気下に保つことを骨子とする精製食用油脂の貯蔵
及び輸送方法である。この充填中の精製食用油脂中へ窒
素ガスを過飽和状態に含有させる方法としては、貯蔵及
び輸送用タンクへ精製食用油脂を導く送油管の中へ窒素
ガスを吹き込むことにより成し得る。この窒素ガスの吹
き込み量は、タンク内の酸素の濃度にもよるが、充填す
る精製食用油脂に対して20容量％以上が好ましく、タン
ク内に大気が存在する場合は、50容量％以上にするのが
好ましい。 精製食用油脂を大気が存在する貯蔵及び輸送用タンク
に充填する時は、該タンクの底部より充填し、タンク内
の液面上昇により空間部を自然に縮小させながら窒素ガ
スで置換することが重要で、大気と精製食用油脂との接
触を最小に抑える必要がある。 他のタンクへ精製食用油脂を充填することによって、
タンク内は完全に空になるか、或は液面の降下により空
間部の増大が生じる。通常は、この時タンク内は減圧と
なり大気を吸い込むが、本発明では、減圧分を窒素ガス
の補填で補い、常に窒素の濃度が99.5％以上であるよう
に窒素ガス雰囲気を保持させている。これは本発明の窒
素ガス雰囲気の維持には重要な要件の一つである。 この窒素ガスの補填に用いる窒素ガスを、充填されて
いるタンクの空間部から排出される窒素ガスを還流使用
することによって、窒素ガスを繰り返し使用し、その使
用量を極端に減少させることもできる。この場合、充填
されているタンクから排出される窒素ガスの窒素濃度が
99.5％以上あることが望ましい。タンカー等、行きと帰
りでは積荷が異なる場合があり、タンク洗浄等で大気を
吸い込んだ場合等、窒素濃度が99.5％以下に低下したも
のを還流使用するのは好ましくない。 この様にして、貯蔵及び輸送タンク内の窒素ガスが窒
素濃度99.5％以上に確保されても、貯蔵及び輸送中の気
温に変化によって、タンク内の空間部の気体は、膨張或
は収縮し、それに伴い空間部の圧力が上昇したり降下し
たりするため、タンクは呼吸をし外気を吸い込むことが
ある。即ち、気温上昇による圧力の上昇は、タンクの上
部に取り付けを義務付けられている呼吸弁等で内部の窒
素ガスを圧力に応じて排出させれば良いが、気温の低下
による圧力の減少は、呼吸弁等を介して外気を吸引し、
直ちにタンク内の窒素濃度を99.5％以下に低下させ、精
製食用油脂の品質劣化に繋がってしまうので好まくな
い。 この様な、気温の変化に伴うタンクの呼吸現象によ
り、タンクが外気を吸入することを防止するために、タ
ンク内の圧力の低下に伴って、直ちにそれに見合う分の
窒素ガスが補充される機構とすることが好ましい。この
窒素ガスの補充する機構として、タンク内の圧力を検知
し、検知した圧力低下に伴って、随時自動的に窒素ガス
を貯蔵乃至輸送用タンクに吹き込む方法を用いるか、或
は気温の変化に関係なく、常に少量の窒素ガスを吹き込
み、タンク内を正圧に保つことによって外気の吸入を防
ぐことが可能である。 窒素ガスの吹き込みは、タンクの底部から吹き込むこ
ともできる。底部より窒素ガスを吹き込むことにより空
間部の気体が精製食用油脂内に溶解し難くし、常に空間
部の気体中の窒素濃度は上昇するので好ましい。窒素ガ
スの吹き込み量としては、気温の低下に伴う空間部の圧
力の低下に見合う量以上が望ましく、気温の変化の速度
及び空間部の容量の大きさによって適宜決定される。 この様にして、精製食用油脂の貯蔵及び輸送の全ての
系に於いて、窒素濃度を99.5％以上に保持することによ
って、品質の劣化は完全に防止され、半年間の長期保存
後も再精製を全く必要としないものであった。In order to achieve the above object, the present inventors have reviewed the conventional storage and transportation methods under a nitrogen gas atmosphere in detail. In the conventional method of filling nitrogen gas during storage and transportation, the nitrogen concentration in the atmosphere is almost 97% or less in most cases, and reaches only about 99% even when the nitrogen gas is replaced at a high degree. This means that after refining edible oils and fats, the storage and transport of the edible oils and fats are sequentially transferred to storage tanks at the refinery, tank trucks, storage tanks at the loading dock, tankers, receiving tanks at the unloading tank base, tank lorries, storage tanks at the factories used However, at the time of this transshipment, each tank normally contains atmospheric air. The space capacity is reduced while expelling with the fat or oil filling the air. The space volume is required to maintain at least 10% of the total volume for controlling the pressure in the tank. Then, nitrogen gas is blown into the space where 10% or more is secured, and the nitrogen concentration in the space is gradually increased. However, this nitrogen gas replacement requires a large amount of nitrogen gas,
Normally, even if nitrogen gas having a volume four times that of the space is supplied, the nitrogen gas concentration in the space is only about 98% at most.
On the other hand, since the refined oil and fat being filled is in contact with the air in the space, oxygen in the air is taken in and dissolved in the oil and fat, and even if the space is replaced with nitrogen gas at a high concentration, purification is performed. Oxygen dissolved in fats and oils reacts with fats and oils, often causing deterioration of refined fats and oils. In order to suppress the influence of oxygen existing in the tank at the time of this filling, a method of filling the fats and oils after replacing the air in the tank with nitrogen gas in advance has been attempted. However, in this case, the amount of nitrogen gas required for replacement becomes enormous compared to the replacement of the above-mentioned space of about 10%, and the cost increases. In many cases, the gas in the tank is filled before filling. Is not completely replaced with nitrogen gas. Under these circumstances, as a result of various studies on the quality deterioration of edible oils and fats, a method for stably maintaining the quality for a long time was found. That is, the present invention introduces a refined edible oil or fat containing a supersaturated amount of nitrogen gas into a storage and transport tank, and, when holding the refined edible oil or fat in the tank, increases the pressure in the tank. This is a method for storing and transporting refined edible oils and fats, which is to maintain refined edible oils and fats in a nitrogen gas atmosphere having a concentration of 99.5% or more by maintaining a positive pressure with nitrogen gas. As a method for causing the nitrogen gas to be contained in the refined edible oil and fat during the filling in a supersaturated state, nitrogen gas can be blown into an oil feed pipe for guiding the purified edible oil and fat to a storage and transport tank. The amount of nitrogen gas blown depends on the concentration of oxygen in the tank, but is preferably 20% by volume or more based on the refined edible oil to be filled. When the atmosphere exists in the tank, the amount is 50% by volume or more. Is preferred. When filling refined edible fats and oils into storage and transport tanks where air is present, it is important to fill the tanks from the bottom and replace them with nitrogen gas while naturally reducing the space by rising the liquid level in the tanks. Therefore, it is necessary to minimize the contact between the air and the refined edible oil and fat. By filling other tanks with refined edible fat,
The tank is completely emptied, or the space level increases due to a drop in the liquid level. Normally, at this time, the pressure in the tank is reduced and the atmosphere is sucked in. However, in the present invention, the reduced pressure is compensated for by supplementing with nitrogen gas, and the nitrogen gas atmosphere is maintained so that the nitrogen concentration is always 99.5% or more. This is one of the important requirements for maintaining the nitrogen gas atmosphere of the present invention. By recirculating the nitrogen gas used for replenishing the nitrogen gas and discharging the nitrogen gas discharged from the space portion of the filled tank, the amount of the nitrogen gas can be extremely reduced by repeatedly using the nitrogen gas. . In this case, the nitrogen concentration of the nitrogen gas discharged from the filled tank
Desirably, it is 99.5% or more. The cargo may differ between going and returning, such as in a tanker, and it is not preferable to use a material whose nitrogen concentration has dropped to 99.5% or less, such as in the case where the air is sucked in for washing a tank or the like. In this way, even if the nitrogen gas in the storage and transport tank is maintained at a nitrogen concentration of 99.5% or more, the gas in the space in the tank expands or contracts due to changes in the temperature during storage and transport, As a result, the pressure in the space rises or falls, so that the tank may breathe and inhale the outside air. That is, the rise in pressure due to a rise in temperature can be achieved by discharging the internal nitrogen gas according to the pressure with a breathing valve or the like that is required to be attached to the upper part of the tank. Suction outside air through a valve, etc.
Immediately lowering the nitrogen concentration in the tank to 99.5% or less, which leads to deterioration of the quality of refined edible fats and oils, is not preferable. In order to prevent the tank from inhaling outside air due to such a tank breathing phenomenon accompanying a change in air temperature, a mechanism for immediately replenishing nitrogen gas in an amount corresponding to the drop in the tank pressure as the tank pressure drops. It is preferable that As a mechanism for replenishing the nitrogen gas, a method of detecting the pressure in the tank and automatically blowing the nitrogen gas into the storage or transportation tank at any time according to the detected pressure drop, or using a method of changing the temperature. Regardless, it is possible to prevent the inhalation of outside air by always blowing a small amount of nitrogen gas and keeping the inside of the tank at a positive pressure. Nitrogen gas can be blown from the bottom of the tank. By blowing nitrogen gas from the bottom, the gas in the space becomes difficult to dissolve in the refined edible oil and fat, and the nitrogen concentration in the gas in the space always increases, which is preferable. The amount of nitrogen gas blown is desirably equal to or more than the amount corresponding to the decrease in pressure in the space due to the decrease in temperature, and is appropriately determined according to the speed of change in temperature and the size of the capacity of the space. In this way, by maintaining the nitrogen concentration at 99.5% or more in all systems for storing and transporting refined edible oils and fats, quality deterioration is completely prevented, and refining is performed after long-term storage for half a year. Was not required at all.
以下、実施例により本発明の具体例を述べるが、例示
は単に説明用のものであって、発明精神の限定を意図し
たものではない。 実施例１ マレーシアの精製工場で精製したパーム油を、工場に
設置された貯蔵タンクに空間容積が約90％になるまで充
填した。この時、送油管には精製パーム油に対して30容
量％の純度99.99％の窒素ガスを圧入した。充填直後の
空間部の窒素濃度は91.3％であった。この貯蔵タンクの
底部から同濃度の窒素ガスを毎時空間容積の約２％量圧
入し５日間貯蔵後、タンク内に窒素濃度は99.2％であっ
た。この精製パーム油をタンクローリーで船積み場へ移
送し、備蓄タンクに充填した。備蓄タンクで３日間貯蔵
後、タンカーに積替え15日間かけて日本国内のタンク基
地へ輸送し、基地のタンクへ荷下しした。更に、基地の
タンクからは順次タンクローリーで精製パーム油の使用
先へ陸送した。この間、各タンクには最初は大気が入っ
ていたが、各タンクから次のタンクに送油するに際し、
タンクの液面の下降に見合う窒素ガスを送入して各タン
ク内を窒素ガス雰囲気に保ち、各タンクに充填する際に
は、前記の貯蔵タンクへの充填時と同様に送油管に窒素
ガスを圧入しながら充填し、貯蔵及び輸送中には各タン
クの底部より常に窒素ガスの吹き込みを行った。 次に、第２回目として、各タンク内の窒素濃度が99.8
％以上に保持された以外は、第１回目（前記）と全く同
様にして窒素ガス雰囲気を維持しながら精製パーム油を
マレーシヤから日本国内へ輸送した。精製直後から日本
国内のタンク基地（10日間貯蔵）にいたる各タンクでの
精製パーム油の品質及びその時の各タンクの雰囲気の窒
素濃度の測定結果は第1a表及び第1b表に示す通りであ
る。 表中、N2濃度はタンク空間部の窒素濃度（％）、POV
は精製パーム油の過酸化物価（meq/kg）、FFAは精製パ
ーム油の遊離脂肪酸（％）を示す。 第１回目での精製パーム油は、各タンクで大気と接触
し、タンク内の窒素濃度を充分に上げることができない
こともあり、再精製を行わねばならない程度に品質、特
に風味が低下していた。これに対して、第２回目の品質
は殆ど変化のないものであった。 実施例２ タンカーは、復路で別の製品を積むことがあり、その
場合、窒素ガス雰囲気を保持することが困難となる。タ
ンカーの窒素ガス雰囲気が破れ、タンク内に外気が取り
込まれていること、及びタンカーに精製パーム油を充填
する際に、送油管に吹き込む窒素ガスの量を精製パーム
油に対して60容量％とする以外は実施例１の第２回目と
全く同様にして精製パーム油の貯蔵及び輸送をおこなっ
た。 各タンクの窒素濃度、及び精製パーム油の品質は第２
表に示す通りである。 タンカーに充填時の大気との接触で僅かに品質劣化の
傾向を示したが、風味の低下は全くなく実質的に全く問
題のない品質であった。 実施例３ 実施例１の第２回目と全く同様にして、タンクに精製
パーム油を充填する際に、タンクから排出される窒素ガ
スを回収し、充填のため送油しているタンクの空間部に
補填した。 各タンクの窒素濃度、及び精製パーム油の品質は第３
表に示す通りである。 表からも明らかな様に、回収した窒素ガスを用いて
も、実施例１の第２回目の品質と同等の物が得られた。 実施例４ 大豆から抽出し、精製した大豆油を工場岸壁の貯蔵タ
ンクに充填し、貯蔵タンクから直接小型タンカーに船積
し、国内の遠隔タンク基地へ輸送した。この流通過程で
窒素ガス雰囲気の保持に関しては実施例３と全く同様に
行った。 各タンクの窒素濃度、及び、精製大豆油の品質は第４
表に示す通りである。 Hereinafter, specific examples of the present invention will be described with reference to examples. However, the exemplification is merely for explanation, and is not intended to limit the spirit of the invention. Example 1 Palm oil refined at a refinery in Malaysia was filled in a storage tank installed in the factory until the space volume became about 90%. At this time, nitrogen gas having a purity of 99.99% and a volume of 30% by volume with respect to the refined palm oil was injected into the oil pipe. The nitrogen concentration in the space immediately after filling was 91.3%. Nitrogen gas of the same concentration was injected from the bottom of the storage tank by about 2% of the hourly space volume and stored for 5 days. After that, the nitrogen concentration in the tank was 99.2%. This refined palm oil was transferred to a loading dock by a tank lorry and filled in a storage tank. After storing for 3 days in the storage tank, the tanker was transshipped to a tanker, transported to a tank base in Japan for 15 days, and unloaded to the tank at the base. In addition, tank trucks were used to transport refined palm oil from the base tank to land where it was used. During this time, each tank was initially filled with air, but when refueling from one tank to the next,
Nitrogen gas corresponding to the drop in the liquid level of the tank is supplied to maintain the inside of each tank in a nitrogen gas atmosphere, and when filling each tank, the nitrogen gas is supplied to the oil supply pipe in the same manner as when filling the storage tank. Was charged while pressurizing, and nitrogen gas was always blown from the bottom of each tank during storage and transportation. Next, as the second time, the nitrogen concentration in each tank was 99.8%.
%, And the refined palm oil was transported from Malaysia to Japan while maintaining the nitrogen gas atmosphere in exactly the same manner as in the first time (above), except that it was maintained at above%. The measured results of the quality of refined palm oil and the nitrogen concentration in the atmosphere of each tank at each tank from immediately after refining to the tank base in Japan (storage for 10 days) are as shown in Tables 1a and 1b . In the table, the nitrogen concentration of the N 2 concentration tank space (%), POV
Indicates the peroxide value (meq / kg) of refined palm oil, and FFA indicates the free fatty acid (%) of refined palm oil. The refined palm oil in the first round is in contact with the atmosphere in each tank, and the nitrogen concentration in the tank may not be able to be sufficiently increased, so that the quality, particularly the flavor, is reduced to such an extent that refining must be performed. Was. On the other hand, the quality of the second time was almost unchanged. Example 2 In a tanker, another product may be loaded on the return path, in which case it becomes difficult to maintain the nitrogen gas atmosphere. The tanker's nitrogen gas atmosphere was broken and the outside air was taken into the tank. When filling the tanker with refined palm oil, the amount of nitrogen gas blown into the oil supply pipe was 60% by volume with respect to the refined palm oil. The storage and transportation of the refined palm oil were carried out in exactly the same manner as in the second example of Example 1 except that the above-mentioned procedure was performed. Nitrogen concentration in each tank and quality of refined palm oil are second
It is as shown in the table. The tanker showed a slight tendency to deteriorate in quality due to contact with the atmosphere at the time of filling, but the quality was substantially no problem with no decrease in flavor. Example 3 When filling the tank with refined palm oil, the nitrogen gas discharged from the tank is collected and completely fed to the tank for filling as described in the second embodiment. Was supplemented. The nitrogen concentration in each tank and the quality of refined palm oil are third.
It is as shown in the table. As is clear from the table, even when the recovered nitrogen gas was used, a product equivalent to the quality of the second example of Example 1 was obtained. Example 4 A soybean oil extracted and refined from soybeans was filled in a storage tank on a factory quay, loaded directly from a storage tank into a small tanker, and transported to a remote tank base in Japan. In this circulation process, the nitrogen gas atmosphere was maintained in exactly the same manner as in Example 3. The nitrogen concentration in each tank and the quality of refined soybean oil are the fourth.
It is as shown in the table.
───────────────────────────────────────────────────── フロントページの続き 合議体 審判長 吉村 康男 審判官 中野 修身 審判官 横尾 俊一 (56)参考文献 特開 昭52−28505（ＪＰ，Ａ) 原田一郎著「改訂油脂化学の知識」昭 53−５−25改訂版第４刷（株）幸書房 Ｐ．108 ──────────────────────────────────────────────────続 き Continuing on the front page Jury President Yasuo Yoshimura Judge Osamu Nakano Judge Shunichi Yokoo (56) References JP-A-52-28505 (JP, A) Ichiro Harada, "Knowledge of Revised Fat and Oil Chemistry", Showa 53- 5-25 Revised Edition 4th Printing Co., Ltd. 108
Claims (5)
和量含有させた状態の精製食用油脂を導入すること、及
び、該タンク内で精製食用油脂を保持するに際し、タン
ク内の圧力を窒素ガスによって正圧に保つこと、によっ
て、精製食用油脂を濃度99.5％以上の窒素ガス雰囲気下
に保つことを特徴とする精製食用油脂の貯蔵及び輸送方
法。1. A method for introducing a refined edible oil / fat containing a supersaturated amount of nitrogen gas into a storage / transport tank, and adjusting the pressure in the tank to nitrogen when maintaining the edible oil / fat in the tank. A method for storing and transporting refined edible fats and oils, wherein the refined edible fats and oils are maintained in a nitrogen gas atmosphere having a concentration of 99.5% or more by maintaining the edible fats and oils at a positive pressure.
を導く導入管内へ窒素ガスを吹き込むことにより導入す
る精製食用油脂中に窒素ガスを含有させる請求項１記載
の方法。2. The method according to claim 1, wherein nitrogen gas is contained in the refined edible oil and fat introduced by blowing nitrogen gas into an introduction pipe for introducing the refined edible oil and fat into the storage and transport tank.
導く導入管中へ、油脂に対して20容量％以上の窒素ガス
を吹き込む請求項２記載の方法。3. The method according to claim 2, wherein nitrogen gas is blown into the introduction pipe for introducing the refined edible oil / fat to the storage / transportation tank portion in an amount of 20% by volume or more based on the oil / fat.
部より充填する請求項１記載の方法。4. The method according to claim 1, wherein the refined edible fat is filled from the bottom of the storage and transportation tank.
ガスを充填油脂を供給しているタンクに還流させる請求
項１記載の方法。5. The method according to claim 1, wherein the nitrogen gas discharged from the storage or transportation tank is refluxed to the tank supplying the filling oil and fat.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1095890A JP2634234B2 (en) | 1989-04-14 | 1989-04-14 | Method for storing and transporting refined edible fats and oils |
| MYPI90000557A MY105574A (en) | 1989-04-14 | 1990-04-06 | Method of preventing edible oils and fats from deteriorating |
| GB9008394A GB2231252B (en) | 1989-04-14 | 1990-04-12 | Method of preventing edible oils and fats from deteriorating |
| US07/922,648 US5298271A (en) | 1989-04-14 | 1992-07-30 | Method of preventing edible oils and fats from deteriorating |
| SG1995A SG1995G (en) | 1989-04-14 | 1995-01-09 | Method of preventing edible oils and fats from deteriorating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1095890A JP2634234B2 (en) | 1989-04-14 | 1989-04-14 | Method for storing and transporting refined edible fats and oils |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02272098A JPH02272098A (en) | 1990-11-06 |
| JP2634234B2 true JP2634234B2 (en) | 1997-07-23 |
Family
ID=14149908
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1095890A Expired - Lifetime JP2634234B2 (en) | 1989-04-14 | 1989-04-14 | Method for storing and transporting refined edible fats and oils |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP2634234B2 (en) |
| GB (1) | GB2231252B (en) |
| MY (1) | MY105574A (en) |
| SG (1) | SG1995G (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102161934A (en) * | 2011-03-11 | 2011-08-24 | 徐幸胜 | Process and equipment for preserving and refining plant oil |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5637338A (en) * | 1993-01-18 | 1997-06-10 | Unilever Patent Holdings Bv | Modification of edible oil flavor |
| FI941617A (en) * | 1994-04-08 | 1995-10-12 | Aga Ab | Method for prolonging the service life of deep frying fat |
| JP2000014318A (en) * | 1998-07-07 | 2000-01-18 | Susumu Kobayashi | Prevention of deterioration of edible oil and device for preventing the deterioration |
| KR100344907B1 (en) * | 1999-12-13 | 2002-07-20 | 네오메가(주) | A method for manufacturing refined fish oil |
| JP2007040318A (en) * | 2005-07-29 | 2007-02-15 | Idemitsu Kosan Co Ltd | Deterioration prevention system for lubricant |
| JP2009268369A (en) * | 2008-04-30 | 2009-11-19 | Nisshin Oillio Group Ltd | Edible oil having excellent storage stability, and method for production thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5228505A (en) * | 1975-08-30 | 1977-03-03 | Nisshin Oil Mills Ltd:The | Method for filling edible oil |
| JP2734867B2 (en) * | 1992-02-17 | 1998-04-02 | 日本鋼管株式会社 | Method for producing thin steel sheet with excellent formability and surface properties |
-
1989
- 1989-04-14 JP JP1095890A patent/JP2634234B2/en not_active Expired - Lifetime
-
1990
- 1990-04-06 MY MYPI90000557A patent/MY105574A/en unknown
- 1990-04-12 GB GB9008394A patent/GB2231252B/en not_active Expired - Lifetime
-
1995
- 1995-01-09 SG SG1995A patent/SG1995G/en unknown
Non-Patent Citations (1)
| Title |
|---|
| 原田一郎著「改訂油脂化学の知識」昭５３−５−２５改訂版第４刷（株）幸書房Ｐ．１０８ |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102161934A (en) * | 2011-03-11 | 2011-08-24 | 徐幸胜 | Process and equipment for preserving and refining plant oil |
Also Published As
| Publication number | Publication date |
|---|---|
| SG1995G (en) | 1995-06-16 |
| JPH02272098A (en) | 1990-11-06 |
| GB2231252B (en) | 1992-10-28 |
| GB2231252A (en) | 1990-11-14 |
| MY105574A (en) | 1994-10-31 |
| GB9008394D0 (en) | 1990-06-13 |
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