WO2023233960A1 - Method and device for recovering oil from oil-containing waste liquid - Google Patents

Method and device for recovering oil from oil-containing waste liquid Download PDF

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WO2023233960A1
WO2023233960A1 PCT/JP2023/017735 JP2023017735W WO2023233960A1 WO 2023233960 A1 WO2023233960 A1 WO 2023233960A1 JP 2023017735 W JP2023017735 W JP 2023017735W WO 2023233960 A1 WO2023233960 A1 WO 2023233960A1
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oil
waste liquid
solvent
containing waste
recovering
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PCT/JP2023/017735
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French (fr)
Japanese (ja)
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聡 山田
恒行 吉田
敏 和田
大貴 内田
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栗田工業株式会社
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D11/00—Solvent extraction
    • B01D11/04—Solvent extraction of solutions which are liquid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping

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  • the present invention relates to a method and apparatus for recovering oil from oil-containing waste liquid, and particularly to a method and apparatus for recovering oil from oil-containing waste liquid using solvent extraction.
  • Methods for treating oil-containing wastewater which is concentrated organic wastewater generated from petroleum processes, steel rolling processes, pulp and paper manufacturing, metal cutting processes, food manufacturing, leather manufacturing, kitchens, sewage, etc.
  • coagulation treatment Patent Document 1
  • Patent Document 2 a treatment that combines activated carbon treatment, aggregation treatment, and membrane separation treatment
  • Patent Document 3 biological treatment
  • An object of the present invention is to provide a method and apparatus for recovering oil from oil-containing waste liquid, which can stably and efficiently separate and recover oil from oil-containing waste liquid.
  • the present inventors have discovered that oil can be stably and efficiently separated and recovered from oil-containing waste liquid by using solvent extraction.
  • the gist of the present invention is as follows.
  • the solvent has a boiling point lower than the oil to be recovered, and in the oil recovery step, the oil is separated from the oil-containing solvent by heated distillation. Oil recovery method.
  • the oil-containing waste liquid is from a waste liquid from a factory that manufactures parts for automobiles etc. that contains mineral oil, a waste liquid from a pulp and paper factory that contains turpentine oil, an oil refinery that contains animal or vegetable oil, a food and beverage factory, or a food and beverage industry business.
  • the method for recovering oil from the oil-containing waste liquid according to any one of [1] to [8], which is any of the waste liquids.
  • Extraction means for transferring the oil in the oil-containing waste liquid to the solvent by extracting the oil-containing waste liquid with a solvent; separation means for separating the extracted oil-containing solvent and the waste liquid;
  • the present invention is characterized by comprising an oil recovery means for separating and recovering the oil from the oil-containing solvent, and a liquid supply means for feeding the solvent from which the oil has been separated by the oil recovery means to the extraction means. Oil recovery equipment from oil-containing waste liquid.
  • the apparatus for recovering oil from an oil-containing waste liquid according to any one of [12] to [14], further comprising a concentrating means for concentrating the oil-containing waste liquid upstream of the extraction means.
  • the apparatus for recovering oil from an oil-containing waste liquid according to any one of [12] to [16], further comprising a liquid feeding means for supplying the waste liquid separated by the separation means to a wastewater treatment means.
  • the apparatus for recovering oil from an oil-containing waste liquid according to any one of [12] to [17], further comprising an addition means for adding salt, alkali, or acid to the oil-containing waste liquid upstream of the extraction means.
  • the oil-containing waste liquid is from a waste liquid from a factory that manufactures parts for automobiles etc. that contains mineral oil, a waste liquid from a pulp and paper factory that contains turpentine oil, an oil refinery that contains animal and vegetable oils, a food and beverage factory, or a food and beverage industry business.
  • the oil recovery device from the oil-containing waste liquid according to any one of [12] to [19], which is any one of the waste liquids.
  • Oil recovery from oil-containing waste liquid according to any one of [12] to [21], further comprising means for supplying the oil recovered by the oil recovery means to the oil-containing waste liquid discharge location as an energy source.
  • Device for supplying the oil recovered by the oil recovery means to the oil-containing waste liquid discharge location as an energy source.
  • oil can be stably and efficiently separated and recovered from oil-containing waste liquid by using solvent extraction. Furthermore, in the present invention, since the solvent used for extraction is reused, the processing cost is also low. According to the present invention, it is possible to significantly reduce the oil content in the oil-containing waste liquid that inhibits wastewater treatment, and to recover and reuse highly pure oil content. Furthermore, it becomes possible to apply oil-containing waste liquid, which has conventionally been disposed of as industrial waste, to wastewater treatment. Therefore, the industrial utility value of the present invention is extremely large.
  • FIG. 1 is a flow diagram showing a method and apparatus for recovering oil from oil-containing waste liquid according to an embodiment of the present invention.
  • FIG. 1 is a flow diagram showing a method and apparatus for recovering oil from oil-containing waste liquid according to an embodiment of the present invention.
  • oil-containing waste liquids to be treated in the present invention include thick oil-containing waste liquids generated from petroleum processes, steel rolling processes, paper and pulp manufacturing, metal cutting processes, food manufacturing, leather manufacturing, kitchens, sewage, etc. Specific examples include, but are not limited to, aqueous cutting fluid waste, turpentine oil-containing wastewater discharged from paper and pulp factories, and food wastewater.
  • the oil in the oil-containing waste liquid may be either mineral oil or animal or vegetable oil.
  • the oil concentration of the oil-containing waste liquid is usually about 0.05 to 1% by weight. More specifically, oil-containing waste liquids include waste liquid from automobile parts manufacturing factories containing mineral oil, waste liquid from paper and pulp factories containing turpentine oil, oil refineries, food and beverage factories, or food and beverage factories containing animal and vegetable oils. Examples include effluents from industrial operations.
  • the oil-containing waste liquid may be an organic-containing waste liquid extracted into a non-polar solvent.
  • oil-containing waste liquid is introduced into a membrane separation device 2 via a pipe 1 and concentrated by membrane separation.
  • a part of the permeated water that has passed through the membrane is returned to the membrane separator 2 through the pipe 4A.
  • the remainder of the permeated water is sent to wastewater treatment equipment (not shown) via piping 4B and treated.
  • Concentrated water and extraction solvent from the membrane separation device 2 are supplied to the mixing section 6a of the extraction device 6 via piping 5 and piping 7, respectively.
  • the concentrated water and extraction solvent supplied to the mixing section 6a are mixed in the mixing section 6a, and the oil content in the concentrated water is incorporated into the solvent. That is, the oil in the concentrated water is dissolved in the extraction solvent.
  • the solvent in which the oil has been dissolved and the concentrated water (residual liquid) from which the oil has been extracted are separated in the separation section 6b, and the solvent in which the oil has been dissolved is supplied to the cold source flow path of the heat exchanger 9 via piping 8.
  • the solvent in which the oil is dissolved exchanges heat with the solvent vapor flowing through the cooled fluid flow path, is heated, and is introduced into the distillation column 11 through the pipe 10.
  • the solvent which is a low boiling point component, flows to the top side of the column, and the oil component, which is a high boiling point component, flows to the bottom side.
  • the solvent vapor is supplied from the distillation column 11 via the piping 12 to the cooled fluid flow path of the heat exchanger 9, and is cooled by exchanging heat with the extractor effluent (low temperature liquid) flowing through the cold heat source flow path. becomes.
  • This liquid solvent is sent to the mixing section 6a of the extraction device 6 through the pipe 7 and reused as an extraction solvent.
  • the separated oil is taken out from the bottom of the distillation column 11 via a pipe 14.
  • This oil is used as recovered oil as a liquid fuel or a combustion aid for power generation and other various uses. If necessary, the recovered oil may be further subjected to other treatments.
  • the residual liquid from which the oil has been extracted is taken out from the separation section 6b of the extraction device 6 via the pipe 20.
  • This residual liquid is sent to the membrane separation device 21, and the solvent component (residual solvent) in the residual liquid is concentrated by membrane separation.
  • the permeated water that has passed through the membrane 21a of the membrane separator 21 is taken out as treated water via the pipe 22.
  • Concentrated water from the membrane separator 21 is discharged through a pipe 23, sent to a waste liquid treatment process (not shown), and subjected to concentration treatment, wastewater treatment, or the like.
  • the oil-containing waste liquid is membrane-separated in the membrane separation device 2 to increase the oil concentration.
  • the liquid may be subjected to a separation process using an oil-water separator, and then sent to the extraction device 6 immediately or after a separation process such as a membrane separation process is performed as necessary.
  • the extraction device 6 may be either a continuous type or a batch type.
  • Continuous liquid-liquid extractors used on an industrial scale include mixer settler types, spray towers, perforated plate towers, and the like.
  • the extraction device may be any of these or may be other than these.
  • the solvent used for extraction is preferably determined from the comprehensive viewpoint of compatibility with the oil to be extracted and solvent regeneration.
  • a solvent with a boiling point lower than that of the oil is used.
  • an extraction solvent that has a boiling point lower than the boiling point of the oil to be separated (approximately 250 to 600°C).
  • the boiling point of the solvent used for extraction needs to be 100° C. or lower.
  • the boiling point of the solvent used for extraction is preferably about 40 to 90°C.
  • solvents used for extraction include normal hexane, heptane, pentane, octane, diethyl ether, methyl tert-butyl ether, 1-octanol, chloroform, carbon tetrachloride, benzene, toluene, ethyl acetate, acetone, dichloromethane, and acetonitrile.
  • solvents used for extraction include normal hexane, heptane, pentane, octane, diethyl ether, methyl tert-butyl ether, 1-octanol, chloroform, carbon tetrachloride, benzene, toluene, ethyl acetate, acetone, dichloromethane, and acetonitrile.
  • solvents include, but are not limited to these solvents in any way.
  • the solvent is regenerated by separating the oil from the oil-containing solvent by heated distillation.
  • heating distillation that takes advantage of the difference in boiling point between the oil and the solvent is suitable.
  • the heating distillation method both batch distillation and continuous distillation are applicable, and methods such as flash distillation, plate column, and packed column are applicable.
  • the oil concentration in the oil-containing waste liquid to be subjected to extraction is preferably about 0.05 to 5% by weight (for example, 0.1% by weight or more) from the viewpoint of extraction efficiency. Therefore, when the oil concentration of the oil-containing waste liquid is lower than the above range, it is preferable to concentrate the oil-containing waste liquid by gravity separation, pressure flotation, a membrane separation device, or other concentration means prior to the extraction treatment. These methods can be applied even when the oil concentration of the oil-containing waste liquid exceeds the above range.
  • a salt such as sodium chloride, an alkali, or an acid may be added to the oil-containing waste liquid prior to the extraction process.
  • a salt such as sodium chloride, an alkali, or an acid
  • oil content can be reduced by adding about 0.1 to 30% by weight to an oil-containing waste liquid containing about 0.05 to 1% by weight, or by lowering the pH to about 2. Separation efficiency can be increased.
  • the oil concentration of the solvent after extracting the oil from the oil-containing waste liquid is preferably 1% by weight or more, particularly 4% by weight or more.
  • the oil concentration of the normal hexane after extraction is preferably about 2 to 10% by weight from the viewpoint of oil separation efficiency and thermal energy efficiency in solvent regeneration.
  • the membrane separator 21 separates the remaining substances in the waste liquid (residual liquid) after oil separation by applying reverse osmosis membrane treatment, but the solvent in the waste liquid (residual liquid) after oil separation Adsorption treatment such as activated carbon may be applied to separate the components. Further, the remaining solvent may be decomposed by adding an oxidizing agent.
  • Example 1 Oil content was extracted with normal hexane from mineral oil-containing wastewater with an oil concentration of 3 g/L (normal hexane extract concentration). In the following, two cases were tested: one in which 30% by weight of common salt was added to the waste liquid prior to the extraction process, and one in which it was not added. A test tube was used for the extraction, and the conditions were as follows.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Extraction Or Liquid Replacement (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)

Abstract

A method for recovering oil from an oil-containing waste liquid which has an extraction step for transferring the oil in an oil-containing waste liquid to a solvent by subjecting said oil-containing waste liquid to an extraction treatment by using said solvent, a separation step for separating said waste liquid and the solvent, which contains the extracted oil, and an oil recovery step for separating and recovering the oil from the separated oil-containing solvent, said method being characterized in that the solvent from which the oil is separated during said oil recovery step is reused in the extraction step.

Description

油分含有廃液からの油分回収方法及び装置Method and device for recovering oil from oil-containing waste liquid
　本発明は、油分含有廃液からの油分回収方法及び装置に係り、特に溶媒抽出を利用した油分含有廃液からの油分回収方法及び装置に関する。 The present invention relates to a method and apparatus for recovering oil from oil-containing waste liquid, and particularly to a method and apparatus for recovering oil from oil-containing waste liquid using solvent extraction.
　石油プロセス、鉄鋼圧延工程、紙パルプ製造、金属切削工程、食品製造、皮革製造、厨房、下水等から発生する濃厚な有機廃水である含油廃水の処理方法としては、凝集処理（特許文献１）や、活性炭処理と凝集処理と膜分離処理とを組み合わせた処理（特許文献２）、生物処理（特許文献３）などが知られている。 Methods for treating oil-containing wastewater, which is concentrated organic wastewater generated from petroleum processes, steel rolling processes, pulp and paper manufacturing, metal cutting processes, food manufacturing, leather manufacturing, kitchens, sewage, etc., include coagulation treatment (Patent Document 1) and , a treatment that combines activated carbon treatment, aggregation treatment, and membrane separation treatment (Patent Document 2), biological treatment (Patent Document 3), and the like are known.
特開平７－９６２８４号公報Japanese Patent Application Publication No. 7-96284 特開平８－３２３３５０号公報Japanese Patent Application Publication No. 8-323350 特開２００９－３９７０９号公報Japanese Patent Application Publication No. 2009-39709
　油分の凝集分離処理では条件が複雑であり、原水濃度変化に対して処理水濃度が不安定である。
　膜処理では処理水油分濃度は安定するが、膜が閉塞し易い。
　生物処理では油分の低減はなされるものの、排水中の主たるＢＯＤ成分処理の活性低下を招く。 The conditions for oil coagulation separation treatment are complicated, and the treated water concentration is unstable with respect to changes in the raw water concentration.
Membrane treatment stabilizes the oil concentration in treated water, but the membrane is prone to clogging.
Although biological treatment reduces oil content, it leads to a decrease in the activity of treating the main BOD component in wastewater.
　本発明は、油分含有廃液から油分を安定かつ効率的に分離して回収することができる油分含有廃液からの油分回収方法及び装置を提供することを課題とする。 An object of the present invention is to provide a method and apparatus for recovering oil from oil-containing waste liquid, which can stably and efficiently separate and recover oil from oil-containing waste liquid.
　本発明者は、溶媒抽出を利用することにより、油分含有廃液から油分を安定かつ効率的に分離して回収することができることを見出した。
　本発明は、次を要旨とするものである。 The present inventors have discovered that oil can be stably and efficiently separated and recovered from oil-containing waste liquid by using solvent extraction.
The gist of the present invention is as follows.
［１］　油分含有廃液を溶媒で抽出処理することにより該油分含有廃液中の油分を該溶媒へ移行させる抽出工程と、該抽出した油分を含む溶媒と該廃液とを分離する分離工程と、分離された該油分を含む溶媒から油分を分離して回収する油分回収工程とを有し、該油分回収工程で油分が分離された溶媒を前記抽出工程で再利用することを特徴とする油分含有廃液からの油分回収方法。 [1] An extraction step in which the oil content in the oil-containing waste solution is transferred to the solvent by extracting the oil-containing waste solution with a solvent, a separation step in which the solvent containing the extracted oil content and the waste solution are separated, and separation. and an oil recovery step of separating and recovering oil from the oil-containing solvent, wherein the solvent from which the oil was separated in the oil recovery step is reused in the extraction step. How to recover oil from
［２］　前記溶媒は回収対象油分より低い沸点を有しており、前記油分回収工程において、前記油分を含む溶媒から加温蒸留により前記油分を分離する［１］に記載の油分含有廃液からの油分回収方法。 [2] The solvent has a boiling point lower than the oil to be recovered, and in the oil recovery step, the oil is separated from the oil-containing solvent by heated distillation. Oil recovery method.
［３］　前記加温蒸留による分離において、分離された前記溶媒または前記油分の有する熱を、熱交換器またはヒートポンプを用いて前記油分を含む溶媒の加温に利用する［２］に記載の油分含有廃液からの油分回収方法。 [3] The oil component according to [2], wherein the heat possessed by the separated solvent or the oil component in the separation by the heated distillation is used to heat the solvent containing the oil component using a heat exchanger or a heat pump. A method for recovering oil from contained waste liquid.
［４］　前記抽出工程に先立ち、前記油分含有廃液を濃縮する濃縮工程をさらに有する［１］～［３］のいずれかに記載の油分含有廃液からの油分回収方法。 [4] The method for recovering oil from an oil-containing waste liquid according to any one of [1] to [3], further comprising a concentration step of concentrating the oil-containing waste liquid prior to the extraction step.
［５］　前記分離工程で分離された廃液中に残存する溶媒を分解または分離する溶媒処理工程をさらに有する［１］～［４］のいずれかに記載の油分含有廃液からの油分回収方法。 [5] The method for recovering oil from an oil-containing waste liquid according to any one of [1] to [4], further comprising a solvent treatment step of decomposing or separating the solvent remaining in the waste liquid separated in the separation step.
［６］　前記分離工程で分離された廃液を排水処理工程に供する［１］～［５］のいずれかに記載の油分含有廃液からの油分回収方法。 [6] The method for recovering oil from oil-containing waste fluid according to any one of [1] to [5], wherein the waste fluid separated in the separation step is subjected to a wastewater treatment step.
［７］　前記抽出工程に先立ち、前記油分含有廃液に塩、アルカリ又は酸を添加する添加工程をさらに有する［１］～［６］のいずれかに記載の油分含有廃液からの油分回収方法。 [7] The method for recovering oil from an oil-containing waste liquid according to any one of [1] to [6], further comprising an addition step of adding salt, alkali, or acid to the oil-containing waste liquid prior to the extraction step.
［８］　前記分離工程で分離された油分を含む溶媒中の油分濃度が１重量％以上である［１］～［７］のいずれかに記載の油分含有廃液からの油分回収方法。 [8] The method for recovering oil from an oil-containing waste liquid according to any one of [1] to [7], wherein the oil concentration in the oil-containing solvent separated in the separation step is 1% by weight or more.
［９］　前記油分含有廃液が、鉱物油を含有する自動車等の部品製造工場の廃液、ターペンチ油を含有する紙パルプ工場の廃液、動植物油を含有する製油工場、食品飲料工場又は飲食産業事業からの廃液のいずれかである［１］～［８］のいずれかに記載の油分含有廃液からの油分回収方法。 [9] The oil-containing waste liquid is from a waste liquid from a factory that manufactures parts for automobiles etc. that contains mineral oil, a waste liquid from a pulp and paper factory that contains turpentine oil, an oil refinery that contains animal or vegetable oil, a food and beverage factory, or a food and beverage industry business. The method for recovering oil from the oil-containing waste liquid according to any one of [1] to [8], which is any of the waste liquids.
［１０］　前記油分含有廃液が、非極性溶媒に抽出された有機物含有廃液である［１］～［８］のいずれかに記載の油分含有廃液からの油分回収方法。 [10] The method for recovering oil from an oil-containing waste liquid according to any one of [1] to [8], wherein the oil-containing waste liquid is an organic substance-containing waste liquid extracted with a nonpolar solvent.
［１１］　前記油分回収工程で回収された油分を、前記油分含有廃液排出場所のエネルギー源として使用する［１］～［１０］のいずれかに記載の油分含有廃液からの油分回収方法。 [11] The method for recovering oil from an oil-containing waste liquid according to any one of [1] to [10], wherein the oil recovered in the oil recovery step is used as an energy source at the oil-containing waste liquid discharge site.
［１２］　油分含有廃液を溶媒で抽出処理することにより該油分含有廃液中の油分を該溶媒へ移行させる抽出手段と、該抽出した油分を含む溶媒と該廃液とを分離する分離手段と、分離された該油分を含む溶媒から油分を分離して回収する油分回収手段と、該油分回収手段で油分が分離された溶媒を前記抽出手段へ送給する給液手段とを有することを特徴とする油分含有廃液からの油分回収装置。 [12] Extraction means for transferring the oil in the oil-containing waste liquid to the solvent by extracting the oil-containing waste liquid with a solvent; separation means for separating the extracted oil-containing solvent and the waste liquid; The present invention is characterized by comprising an oil recovery means for separating and recovering the oil from the oil-containing solvent, and a liquid supply means for feeding the solvent from which the oil has been separated by the oil recovery means to the extraction means. Oil recovery equipment from oil-containing waste liquid.
［１３］　前記溶媒は回収対象油分より低い沸点を有しており、前記油分回収手段は、前記油分を含む溶媒から加温蒸留により前記油分を分離する手段である［１２］に記載の油分含有廃液からの油分回収装置。 [13] The oil-containing solvent according to [12], wherein the solvent has a boiling point lower than the oil to be recovered, and the oil recovery means is a means for separating the oil from the oil-containing solvent by heated distillation. Equipment for recovering oil from waste liquid.
［１４］　前記加温蒸留により分離された前記溶媒または前記油分の有する熱を用いて、前記油分を含む溶媒を加温するための熱交換器またはヒートポンプを有する［１３］に記載の油分含有廃液からの油分回収装置。 [14] The oil-containing waste liquid according to [13], which has a heat exchanger or a heat pump for heating the oil-containing solvent using the heat possessed by the solvent or the oil separated by the heated distillation. Oil recovery equipment from.
［１５］　前記抽出手段の前段に、前記油分含有廃液を濃縮する濃縮手段をさらに有する［１２］～［１４］のいずれかに記載の油分含有廃液からの油分回収装置。 [15] The apparatus for recovering oil from an oil-containing waste liquid according to any one of [12] to [14], further comprising a concentrating means for concentrating the oil-containing waste liquid upstream of the extraction means.
［１６］　前記分離手段で分離された廃液中に残存する溶媒を分解または分離する溶媒処理手段をさらに有する［１２］～［１５］のいずれかに記載の油分含有廃液からの油分回収装置。 [16] The oil recovery device from oil-containing waste liquid according to any one of [12] to [15], further comprising a solvent treatment means for decomposing or separating the solvent remaining in the waste liquid separated by the separation means.
［１７］　前記分離手段で分離された廃液を排水処理手段に供する送液手段を更に有する［１２］～［１６］のいずれかに記載の油分含有廃液からの油分回収装置。 [17] The apparatus for recovering oil from an oil-containing waste liquid according to any one of [12] to [16], further comprising a liquid feeding means for supplying the waste liquid separated by the separation means to a wastewater treatment means.
［１８］　前記抽出手段の前段に、前記油分含有廃液に塩、アルカリ又は酸を添加する添加手段をさらに有する［１２］～［１７］のいずれかに記載の油分含有廃液からの油分回収装置。 [18] The apparatus for recovering oil from an oil-containing waste liquid according to any one of [12] to [17], further comprising an addition means for adding salt, alkali, or acid to the oil-containing waste liquid upstream of the extraction means.
［１９］　前記分離手段で分離された油分を含む溶媒中の油分濃度が１重量％以上である［１２］～［１８］のいずれかに記載の油分含有廃液からの油分回収装置。 [19] The oil recovery device from oil-containing waste liquid according to any one of [12] to [18], wherein the oil concentration in the oil-containing solvent separated by the separation means is 1% by weight or more.
［２０］　前記油分含有廃液が、鉱物油を含有する自動車等の部品製造工場の廃液、ターペンチ油を含有する紙パルプ工場の廃液、動植物油を含有する製油工場、食品飲料工場又は飲食産業事業からの廃液のいずれかである［１２］～［１９］のいずれかに記載の油分含有廃液からの油分回収装置。 [20] The oil-containing waste liquid is from a waste liquid from a factory that manufactures parts for automobiles etc. that contains mineral oil, a waste liquid from a pulp and paper factory that contains turpentine oil, an oil refinery that contains animal and vegetable oils, a food and beverage factory, or a food and beverage industry business. The oil recovery device from the oil-containing waste liquid according to any one of [12] to [19], which is any one of the waste liquids.
［２１］　前記油分含有廃液が、非極性溶媒に抽出された有機物含有廃液である［１２］～［１９］のいずれかに記載の油分含有廃液からの油分回収装置。 [21] The apparatus for recovering oil from an oil-containing waste liquid according to any one of [12] to [19], wherein the oil-containing waste liquid is an organic substance-containing waste liquid extracted with a non-polar solvent.
［２２］　前記油分回収手段で回収された油分を、前記油分含有廃液排出場所へエネルギー源として供給する手段を更に有する［１２］～［２１］のいずれかに記載の油分含有廃液からの油分回収装置。 [22] Oil recovery from oil-containing waste liquid according to any one of [12] to [21], further comprising means for supplying the oil recovered by the oil recovery means to the oil-containing waste liquid discharge location as an energy source. Device.
　本発明によると、溶媒抽出を利用することにより、油分含有廃液から油分を安定かつ効率的に分離して回収することができる。また、本発明では、抽出に用いた溶媒を再利用するので、処理コストも安価である。
　本発明によれば、排水処理を阻害する油分含有廃液中の油分を大幅に低減すると共に、高純度の油分を回収してこれを再利用することができる。さらに、従来、産業廃棄物として処分されていた油分含有廃液を排水処理に適用することが可能となる。
　従って、本発明の工業上の利用価値は極めて大きい。 According to the present invention, oil can be stably and efficiently separated and recovered from oil-containing waste liquid by using solvent extraction. Furthermore, in the present invention, since the solvent used for extraction is reused, the processing cost is also low.
According to the present invention, it is possible to significantly reduce the oil content in the oil-containing waste liquid that inhibits wastewater treatment, and to recover and reuse highly pure oil content. Furthermore, it becomes possible to apply oil-containing waste liquid, which has conventionally been disposed of as industrial waste, to wastewater treatment.
Therefore, the industrial utility value of the present invention is extremely large.
図１は、本発明の実施の形態に係る油分含有廃液からの油分回収方法及び装置を示すフロー図である。FIG. 1 is a flow diagram showing a method and apparatus for recovering oil from oil-containing waste liquid according to an embodiment of the present invention.
　以下に本発明の油分含有廃液からの油分回収方法及び装置の実施の形態を図１を参照して説明する。本発明は何ら以下のものに限定されるものではなく、本発明の要旨の範囲内で種々に変更して実施することができる。 An embodiment of the method and apparatus for recovering oil from oil-containing waste liquid of the present invention will be described below with reference to FIG. 1. The present invention is not limited to the following in any way, and can be implemented with various modifications within the scope of the gist of the present invention.
　図１は、本発明の実施の形態に係る油分含有廃液からの油分回収方法及び装置を示すフロー図である。 FIG. 1 is a flow diagram showing a method and apparatus for recovering oil from oil-containing waste liquid according to an embodiment of the present invention.
　本発明において処理対象となる油分含有廃液としては、石油プロセス、鉄鋼圧延工程、紙パルプ製造、金属切削工程、食品製造、皮革製造、厨房、下水等から発生する濃厚な油分含有廃液が挙げられる。具体的には、水性切削液廃液、製紙やパルプ工場から排出されるターペンチ油含有排水、食品排水が挙げられるが、何らこれらに限定されない。
　油分含有廃液中の油分は鉱物油、動植物油のいずれでもよい。
　油分含有廃液の油分濃度は、通常０．０５～１重量％程度である。
　油分含有廃液としては、より具体的には、鉱物油を含有する自動車等の部品製造工場の廃液、ターペンチ油を含有する紙パルプ工場の廃液、動植物油を含有する製油工場、食品飲料工場又は飲食産業事業からの廃液が挙げられる。
　油分含有廃液は、非極性溶媒に抽出された有機物含有廃液であってもよい。 Examples of oil-containing waste liquids to be treated in the present invention include thick oil-containing waste liquids generated from petroleum processes, steel rolling processes, paper and pulp manufacturing, metal cutting processes, food manufacturing, leather manufacturing, kitchens, sewage, etc. Specific examples include, but are not limited to, aqueous cutting fluid waste, turpentine oil-containing wastewater discharged from paper and pulp factories, and food wastewater.
The oil in the oil-containing waste liquid may be either mineral oil or animal or vegetable oil.
The oil concentration of the oil-containing waste liquid is usually about 0.05 to 1% by weight.
More specifically, oil-containing waste liquids include waste liquid from automobile parts manufacturing factories containing mineral oil, waste liquid from paper and pulp factories containing turpentine oil, oil refineries, food and beverage factories, or food and beverage factories containing animal and vegetable oils. Examples include effluents from industrial operations.
The oil-containing waste liquid may be an organic-containing waste liquid extracted into a non-polar solvent.
　図１において、油分含有廃液は、配管１を介して膜分離装置２に導入され、膜分離により濃縮される。膜を透過した透過水の一部は、配管４Ａから膜分離装置２に返送される。透過水の残部は、配管４Ｂを介して排水処理設備（図示せず）へ送水され、処理される。 In FIG. 1, oil-containing waste liquid is introduced into a membrane separation device 2 via a pipe 1 and concentrated by membrane separation. A part of the permeated water that has passed through the membrane is returned to the membrane separator 2 through the pipe 4A. The remainder of the permeated water is sent to wastewater treatment equipment (not shown) via piping 4B and treated.
　膜分離装置２の濃縮水及び抽出用溶媒は、それぞれ配管５及び配管７を介して抽出装置６の混合部６ａに供給される。 Concentrated water and extraction solvent from the membrane separation device 2 are supplied to the mixing section 6a of the extraction device 6 via piping 5 and piping 7, respectively.
　混合部６ａに供給された濃縮水と抽出用溶媒は、混合部６ａにて混合され、濃縮水中の油分を溶媒中に取り込む。即ち、濃縮水中の油分が抽出用溶媒に溶解する。油分が溶解した溶媒と油分が抽出された濃縮水（残液）は、分離部６ｂで分離され、油分が溶解した溶媒が配管８を介して熱交換器９の冷熱源流路に供給される。この油分が溶解した溶媒は、被冷却流体流路を流れる溶媒蒸気と熱交換し、昇温して配管１０より蒸留塔１１に導入される。蒸留塔１１では低沸点成分である溶媒が塔頂側へ流れ、高沸点成分である油分が塔底側へ流れる。溶媒蒸気は、蒸留塔１１から配管１２を介して熱交換器９の被冷却流体流路に供給され、冷熱源流路を流れる抽出装置流出液（低温液）と熱交換して冷却され、液状溶媒となる。この液状溶媒が配管７によって抽出装置６の混合部６ａに送液され、抽出用溶媒として再利用される。 The concentrated water and extraction solvent supplied to the mixing section 6a are mixed in the mixing section 6a, and the oil content in the concentrated water is incorporated into the solvent. That is, the oil in the concentrated water is dissolved in the extraction solvent. The solvent in which the oil has been dissolved and the concentrated water (residual liquid) from which the oil has been extracted are separated in the separation section 6b, and the solvent in which the oil has been dissolved is supplied to the cold source flow path of the heat exchanger 9 via piping 8. The solvent in which the oil is dissolved exchanges heat with the solvent vapor flowing through the cooled fluid flow path, is heated, and is introduced into the distillation column 11 through the pipe 10. In the distillation column 11, the solvent, which is a low boiling point component, flows to the top side of the column, and the oil component, which is a high boiling point component, flows to the bottom side. The solvent vapor is supplied from the distillation column 11 via the piping 12 to the cooled fluid flow path of the heat exchanger 9, and is cooled by exchanging heat with the extractor effluent (low temperature liquid) flowing through the cold heat source flow path. becomes. This liquid solvent is sent to the mixing section 6a of the extraction device 6 through the pipe 7 and reused as an extraction solvent.
　蒸留塔１１の塔底からは、分離された油分が配管１４を介して取り出される。この油分は、回収油として液体燃料又は助燃剤などとして、発電、その他の各種用途に利用される。必要に応じ、回収油に対して更に他の処理が施されてもよい。 The separated oil is taken out from the bottom of the distillation column 11 via a pipe 14. This oil is used as recovered oil as a liquid fuel or a combustion aid for power generation and other various uses. If necessary, the recovered oil may be further subjected to other treatments.
　前記抽出装置６の分離部６ｂからは、油分が抽出された残液が配管２０を介して取り出される。この残液は、膜分離装置２１に送液され、膜分離により、該残液中の溶媒成分（残存溶媒）の濃縮が行われる。 The residual liquid from which the oil has been extracted is taken out from the separation section 6b of the extraction device 6 via the pipe 20. This residual liquid is sent to the membrane separation device 21, and the solvent component (residual solvent) in the residual liquid is concentrated by membrane separation.
　膜分離装置２１の膜２１ａを透過した透過水は、配管２２を介して処理水として取り出される。膜分離装置２１の濃縮水は、配管２３を介して排出され、廃液処理工程（図示せず）へ送られて、濃縮処理又は排水処理等に供される。 The permeated water that has passed through the membrane 21a of the membrane separator 21 is taken out as treated water via the pipe 22. Concentrated water from the membrane separator 21 is discharged through a pipe 23, sent to a waste liquid treatment process (not shown), and subjected to concentration treatment, wastewater treatment, or the like.
　上記実施の形態では、油分含有廃液を膜分離装置２で膜分離処理して油分濃度を高めるようにしているが、容易に油分と水分が分離する油成分については比重差やマイクロエアーを利用した油水分離機で分離処理を施し、その後、直ちに又は必要に応じ膜分離処理などの分離処理を行ってから、抽出装置６に送液してもよい。 In the embodiment described above, the oil-containing waste liquid is membrane-separated in the membrane separation device 2 to increase the oil concentration. The liquid may be subjected to a separation process using an oil-water separator, and then sent to the extraction device 6 immediately or after a separation process such as a membrane separation process is performed as necessary.
　抽出装置６は連続式、バッチ式のいずれでもよい。工業的規模で用いられる連続液液抽出装置としては、ミキサーセトラ型、スプレー塔、多孔板塔（目皿塔）などがある。抽出装置は、これらのいずれでもよく、これら以外のものでもよい。 The extraction device 6 may be either a continuous type or a batch type. Continuous liquid-liquid extractors used on an industrial scale include mixer settler types, spray towers, perforated plate towers, and the like. The extraction device may be any of these or may be other than these.
　抽出に用いる溶媒は、抽出対象油との相性および溶媒再生の総合的観点から決定するのが好ましい。 The solvent used for extraction is preferably determined from the comprehensive viewpoint of compatibility with the oil to be extracted and solvent regeneration.
　抽出により油分を含む溶媒から加温蒸留により油分を分離する場合は、該油分よりも沸点の低い溶媒が用いられる。この場合、抽出溶媒は分離対象油分の沸点（２５０～６００℃程度）よりも沸点が低いものを用いることが必要である。この場合、油分含有廃液を直接蒸留する場合よりエネルギー的に低い必要があるため、抽出に用いる溶媒の沸点は１００℃以下である必要がある。抽出に用いる溶媒の沸点は４０～９０℃程度であることが好ましい。 When oil is separated from a solvent containing oil by extraction by heated distillation, a solvent with a boiling point lower than that of the oil is used. In this case, it is necessary to use an extraction solvent that has a boiling point lower than the boiling point of the oil to be separated (approximately 250 to 600°C). In this case, since the energy needs to be lower than when directly distilling the oil-containing waste liquid, the boiling point of the solvent used for extraction needs to be 100° C. or lower. The boiling point of the solvent used for extraction is preferably about 40 to 90°C.
　抽出に用いる溶媒としては、具体的にはノルマルヘキサン、ヘプタン、ペンタン、オクタン、ジエチルエーテル、メチルｔｅｒｔ－ブチルエーテル、１－オクタノール、クロロホルム、四塩化炭素、ベンゼン、トルエン、酢酸エチル、アセトン、ジクロロメタン、アセトニトリルなどが挙げられるが、何らこれらの溶媒に限定されるものではない。 Examples of solvents used for extraction include normal hexane, heptane, pentane, octane, diethyl ether, methyl tert-butyl ether, 1-octanol, chloroform, carbon tetrachloride, benzene, toluene, ethyl acetate, acetone, dichloromethane, and acetonitrile. These solvents include, but are not limited to these solvents in any way.
　図１では、加温蒸留により、油分を含む溶媒から油分を分離することで、溶媒を再生している。溶媒の再生には、このように油分と溶媒との沸点差を利用した加温蒸留が好適である。加温蒸留の方式としては、回分式蒸留と連続式蒸留のいずれも適用可能であり、フラッシュ蒸留、棚段塔、充填塔などの方式が適用可能である。 In FIG. 1, the solvent is regenerated by separating the oil from the oil-containing solvent by heated distillation. For regenerating the solvent, heating distillation that takes advantage of the difference in boiling point between the oil and the solvent is suitable. As the heating distillation method, both batch distillation and continuous distillation are applicable, and methods such as flash distillation, plate column, and packed column are applicable.
　本発明において、抽出に供する油分含有廃液中の油分濃度は、０．０５～５重量％程度（例えば０．１重量％以上）であることが、抽出効率の観点から好ましい。従って、油分含有廃液の油分濃度が上記範囲よりも低い場合には、抽出処理に先立ち、重力分離、加圧浮上や膜分離装置、その他の濃縮手段により油分含有廃液を濃縮するのが好ましい。油分含有廃液の油分濃度が上記範囲を超える場合でもこれらの方法の適用は可能である。 In the present invention, the oil concentration in the oil-containing waste liquid to be subjected to extraction is preferably about 0.05 to 5% by weight (for example, 0.1% by weight or more) from the viewpoint of extraction efficiency. Therefore, when the oil concentration of the oil-containing waste liquid is lower than the above range, it is preferable to concentrate the oil-containing waste liquid by gravity separation, pressure flotation, a membrane separation device, or other concentration means prior to the extraction treatment. These methods can be applied even when the oil concentration of the oil-containing waste liquid exceeds the above range.
　油分含有廃液からの油分の分離を促進するために、抽出処理に先立ち、油分含有廃液に塩化ナトリウムなどの塩や、アルカリ又は酸を添加してもよい。
　たとえば、塩化ナトリウムであれば、０．０５～１重量％程度の油分を含む油分含有廃液に０．１～３０重量％程度添加したり、ｐＨを２程度まで低下させたりすることで、油分の分離効率を高めることができる。 In order to promote the separation of oil from the oil-containing waste liquid, a salt such as sodium chloride, an alkali, or an acid may be added to the oil-containing waste liquid prior to the extraction process.
For example, in the case of sodium chloride, oil content can be reduced by adding about 0.1 to 30% by weight to an oil-containing waste liquid containing about 0.05 to 1% by weight, or by lowering the pH to about 2. Separation efficiency can be increased.
　油分含有廃液から油分を抽出した後の溶媒の油分濃度は、１重量％以上、特に４重量％以上であることが好ましい。例えば、ノルマルヘキサンを用いて抽出を行った場合、抽出後のノルマルヘキサンの油分濃度は２～１０重量％程度であることが、油分分離効率、溶媒再生における熱エネルギー効率の観点から好ましい。 The oil concentration of the solvent after extracting the oil from the oil-containing waste liquid is preferably 1% by weight or more, particularly 4% by weight or more. For example, when extraction is performed using normal hexane, the oil concentration of the normal hexane after extraction is preferably about 2 to 10% by weight from the viewpoint of oil separation efficiency and thermal energy efficiency in solvent regeneration.
　図１では、膜分離装置２１により、油分分離後の廃液（残液）中の残存物質を逆浸透膜処理を適用して分離しているが、油分分離後の廃液（残液）中の溶媒成分の分離には活性炭などの吸着処理を適用してもよい。また、残存溶媒は、酸化剤添加により分解処理してもよい。 In FIG. 1, the membrane separator 21 separates the remaining substances in the waste liquid (residual liquid) after oil separation by applying reverse osmosis membrane treatment, but the solvent in the waste liquid (residual liquid) after oil separation Adsorption treatment such as activated carbon may be applied to separate the components. Further, the remaining solvent may be decomposed by adding an oxidizing agent.
　以下に実施例に代わる実験例を挙げて本発明による効果を示す。 The effects of the present invention will be illustrated below by giving experimental examples in place of Examples.
［実験例１］
　油分濃度：３ｇ／Ｌ（ノルマルヘキサン抽出物濃度）の鉱物油含有廃水から油分をノルマルヘキサンで抽出した。
　以下においては、抽出処理に先立ち、廃液に食塩を３０重量％添加した場合と、添加しない場合との２例について試験した。
　抽出には試験管を用い、条件は次の通りとした。
　　Ａ：廃液への食塩添加なし
　　Ｂ：廃液への食塩添加あり（ＮａＣｌ濃度：３０重量％）
　　廃液：ノルマルヘキサン容積比＝１０：１（Ａ、Ｂ共通）
　　操作方法（Ａ，Ｂ共通）：
　　試験管攪拌混合（１００回縦往復）→静置分離（３０分）→上澄み採取
　採取した上澄み（油分含有ノルマルヘキサン）中の油分濃度は、以下の通りであった。
　　Ａ＝０．５重量％
　　Ｂ＝４．５重量％
　この試験より、油分含有廃液より、溶媒抽出により油分を十分に分離回収できること、及び油分含有廃液に食塩を添加することにより、回収効率が向上することが認められた。 [Experiment example 1]
Oil content was extracted with normal hexane from mineral oil-containing wastewater with an oil concentration of 3 g/L (normal hexane extract concentration).
In the following, two cases were tested: one in which 30% by weight of common salt was added to the waste liquid prior to the extraction process, and one in which it was not added.
A test tube was used for the extraction, and the conditions were as follows.
A: No salt added to the waste liquid B: Salt added to the waste liquid (NaCl concentration: 30% by weight)
Waste liquid: normal hexane volume ratio = 10:1 (common to A and B)
Operation method (common to A and B):
Test tube stirring and mixing (100 vertical reciprocations) → Stationary separation (30 minutes) → Supernatant collection The oil concentration in the collected supernatant (oil-containing normal hexane) was as follows.
A=0.5% by weight
B=4.5% by weight
From this test, it was confirmed that oil can be sufficiently separated and recovered from oil-containing waste liquid by solvent extraction, and that the recovery efficiency can be improved by adding salt to oil-containing waste liquid.
［実験例２］
　実験例１のＢの抽出実験で得られた油分濃度４．５重量％のノルマルヘキサンを開放容器に１０ｇ入れホットプレートにて、８０℃で１時間加温後に乾燥させたところ、残留油分として０．４５ｇを得ることができた。この結果から、加温蒸留により、油分を含む溶媒から油分を効率的に分離することができることが確認された。 [Experiment example 2]
When 10g of n-hexane with an oil concentration of 4.5% by weight obtained in the extraction experiment of B in Experimental Example 1 was placed in an open container and heated on a hot plate at 80°C for 1 hour and then dried, the residual oil content was 0. .45g was able to be obtained. From this result, it was confirmed that oil can be efficiently separated from an oil-containing solvent by heated distillation.
　本発明を特定の態様を用いて詳細に説明したが、本発明の意図と範囲を離れることなく様々な変更が可能であることは当業者に明らかである。
　本出願は、２０２２年５月３０日付で出願された日本特許出願２０２２－０８７６４７に基づいており、その全体が引用により援用される。 Although the invention has been described in detail using specific embodiments, it will be apparent to those skilled in the art that various changes can be made without departing from the spirit and scope of the invention.
This application is based on Japanese Patent Application No. 2022-087647 filed on May 30, 2022, which is incorporated by reference in its entirety.
　２，２１　膜分離装置
　６　抽出装置
　１１　蒸留塔 2,21 Membrane separation device 6 Extraction device 11 Distillation column

Claims (22)

  1. 　油分含有廃液を溶媒で抽出処理することにより該油分含有廃液中の油分を該溶媒へ移行させる抽出工程と、該抽出した油分を含む溶媒と該廃液とを分離する分離工程と、分離された該油分を含む溶媒から油分を分離して回収する油分回収工程とを有し、該油分回収工程で油分が分離された溶媒を前記抽出工程で再利用することを特徴とする油分含有廃液からの油分回収方法。 an extraction step of transferring the oil in the oil-containing waste solution to the solvent by extracting the oil-containing waste solution with a solvent; a separation step of separating the extracted oil-containing solvent from the waste solution; and a separation step of separating the extracted oil-containing solvent from the waste solution. An oil content from an oil-containing waste liquid, comprising: an oil recovery process for separating and recovering oil from an oil-containing solvent, and the solvent from which oil has been separated in the oil recovery process is reused in the extraction process. Collection method.
  2. 　前記溶媒は回収対象油分より低い沸点を有しており、前記油分回収工程において、前記油分を含む溶媒から加温蒸留により前記油分を分離する請求項１に記載の油分含有廃液からの油分回収方法。 The method for recovering oil from an oil-containing waste liquid according to claim 1, wherein the solvent has a boiling point lower than the oil to be recovered, and in the oil recovery step, the oil is separated from the oil-containing solvent by heated distillation. .
  3. 　前記加温蒸留による分離において、分離された前記溶媒または前記油分の有する熱を、熱交換器またはヒートポンプを用いて前記油分を含む溶媒の加温に利用する請求項２に記載の油分含有廃液からの油分回収方法。 From the oil-containing waste liquid according to claim 2, wherein in the separation by heating distillation, the heat possessed by the separated solvent or the oil is used to heat the solvent containing the oil using a heat exchanger or a heat pump. oil recovery method.
  4. 　前記抽出工程に先立ち、前記油分含有廃液を濃縮する濃縮工程をさらに有する請求項１に記載の油分含有廃液からの油分回収方法。 The method for recovering oil from an oil-containing waste liquid according to claim 1, further comprising a concentration step of concentrating the oil-containing waste liquid prior to the extraction step.
  5. 　前記分離工程で分離された廃液中に残存する溶媒を分解または分離する溶媒処理工程をさらに有する請求項１に記載の油分含有廃液からの油分回収方法。 The method for recovering oil from oil-containing waste liquid according to claim 1, further comprising a solvent treatment step of decomposing or separating the solvent remaining in the waste liquid separated in the separation step.
  6. 　前記分離工程で分離された廃液を排水処理工程に供する請求項１に記載の油分含有廃液からの油分回収方法。 The method for recovering oil from oil-containing waste fluid according to claim 1, wherein the waste fluid separated in the separation step is subjected to a wastewater treatment step.
  7. 　前記抽出工程に先立ち、前記油分含有廃液に塩、アルカリ又は酸を添加する添加工程をさらに有する請求項１に記載の油分含有廃液からの油分回収方法。 The method for recovering oil from an oil-containing waste liquid according to claim 1, further comprising an addition step of adding salt, alkali, or acid to the oil-containing waste liquid prior to the extraction step.
  8. 　前記分離工程で分離された油分を含む溶媒中の油分濃度が１重量％以上である請求項１に記載の油分含有廃液からの油分回収方法。 The method for recovering oil from an oil-containing waste liquid according to claim 1, wherein the oil concentration in the solvent containing the oil separated in the separation step is 1% by weight or more.
  9. 　前記油分含有廃液が、鉱物油を含有する自動車等の部品製造工場の廃液、ターペンチ油を含有する紙パルプ工場の廃液、動植物油を含有する製油工場、食品飲料工場又は飲食産業事業からの廃液のいずれかである請求項１に記載の油分含有廃液からの油分回収方法。 The oil-containing waste liquid may be waste liquid from a factory that manufactures parts for automobiles etc. that contains mineral oil, waste liquid from a pulp and paper factory that contains turpentine oil, waste liquid that contains animal or vegetable oil from an oil refinery, a food and beverage factory, or a food and beverage industry business. The method for recovering oil from oil-containing waste liquid according to claim 1.
  10. 　前記油分含有廃液が、非極性溶媒に抽出された有機物含有廃液である請求項１に記載の油分含有廃液からの油分回収方法。 The method for recovering oil from an oil-containing waste liquid according to claim 1, wherein the oil-containing waste liquid is an organic substance-containing waste liquid extracted with a non-polar solvent.
  11. 　前記油分回収工程で回収された油分を、前記油分含有廃液排出場所のエネルギー源として使用する請求項１に記載の油分含有廃液からの油分回収方法。 The method for recovering oil from oil-containing waste liquid according to claim 1, wherein the oil recovered in the oil recovery step is used as an energy source for the oil-containing waste liquid discharge site.
  12. 　油分含有廃液を溶媒で抽出処理することにより該油分含有廃液中の油分を該溶媒へ移行させる抽出手段と、該抽出した油分を含む溶媒と該廃液とを分離する分離手段と、分離された該油分を含む溶媒から油分を分離して回収する油分回収手段と、該油分回収手段で油分が分離された溶媒を前記抽出手段へ送給する給液手段とを有することを特徴とする油分含有廃液からの油分回収装置。 an extraction means for transferring the oil in the oil-containing waste liquid to the solvent by extracting the oil-containing waste liquid with a solvent; a separation means for separating the extracted oil-containing solvent from the waste liquid; An oil-containing waste liquid characterized by having an oil recovery means for separating and recovering oil from a solvent containing oil, and a liquid supply means for feeding the solvent from which the oil has been separated by the oil recovery means to the extraction means. Oil recovery equipment from.
  13. 　前記溶媒は回収対象油分より低い沸点を有しており、前記油分回収手段は、前記油分を含む溶媒から加温蒸留により前記油分を分離する手段である請求項１２に記載の油分含有廃液からの油分回収装置。 13. The method according to claim 12, wherein the solvent has a boiling point lower than the oil to be recovered, and the oil recovery means is a means for separating the oil from the oil-containing solvent by heated distillation. Oil recovery equipment.
  14. 　前記加温蒸留により分離された前記溶媒または前記油分の有する熱を用いて、前記油分を含む溶媒を加温するための熱交換器またはヒートポンプを有する請求項１３に記載の油分含有廃液からの油分回収装置。 The oil content from the oil-containing waste liquid according to claim 13, further comprising a heat exchanger or a heat pump for heating the oil-containing solvent using the heat possessed by the solvent or the oil content separated by the heated distillation. Collection device.
  15. 　前記抽出手段の前段に、前記油分含有廃液を濃縮する濃縮手段をさらに有する請求項１２に記載の油分含有廃液からの油分回収装置。 The oil recovery device from oil-containing waste liquid according to claim 12, further comprising a concentrating means for concentrating the oil-containing waste liquid, upstream of the extraction means.
  16. 　前記分離手段で分離された廃液中に残存する溶媒を分解または分離する溶媒処理手段をさらに有する請求項１２に記載の油分含有廃液からの油分回収装置。 The oil recovery device from oil-containing waste liquid according to claim 12, further comprising a solvent treatment means for decomposing or separating the solvent remaining in the waste liquid separated by the separation means.
  17. 　前記分離手段で分離された廃液を排水処理手段に供する送液手段を更に有する請求項１２に記載の油分含有廃液からの油分回収装置。 13. The oil recovery device from oil-containing waste liquid according to claim 12, further comprising liquid feeding means for supplying the waste liquid separated by the separation means to waste water treatment means.
  18. 　前記抽出手段の前段に、前記油分含有廃液に塩、アルカリ又は酸を添加する添加手段をさらに有する請求項１２に記載の油分含有廃液からの油分回収装置。 The apparatus for recovering oil from oil-containing waste liquid according to claim 12, further comprising an addition means for adding salt, alkali, or acid to the oil-containing waste liquid, upstream of the extraction means.
  19. 　前記分離手段で分離された油分を含む溶媒中の油分濃度が１重量％以上である請求項１２に記載の油分含有廃液からの油分回収装置。 The oil recovery device from oil-containing waste liquid according to claim 12, wherein the oil concentration in the oil-containing solvent separated by the separation means is 1% by weight or more.
  20. 　前記油分含有廃液が、鉱物油を含有する自動車等の部品製造工場の廃液、ターペンチ油を含有する紙パルプ工場の廃液、動植物油を含有する製油工場、食品飲料工場又は飲食産業事業からの廃液のいずれかである請求項１２に記載の油分含有廃液からの油分回収装置。 The oil-containing waste liquid may be waste liquid from a factory that manufactures parts for automobiles etc. that contains mineral oil, waste liquid from a pulp and paper factory that contains turpentine oil, waste liquid that contains animal or vegetable oil from an oil refinery, a food and beverage factory, or a food and beverage industry business. The oil recovery device from oil-containing waste liquid according to claim 12.
  21. 　前記油分含有廃液が、非極性溶媒に抽出された有機物含有廃液である請求項１２に記載の油分含有廃液からの油分回収装置。 The oil recovery device from oil-containing waste liquid according to claim 12, wherein the oil-containing waste liquid is an organic matter-containing waste liquid extracted with a non-polar solvent.
  22. 　前記油分回収手段で回収された油分を、前記油分含有廃液排出場所へエネルギー源として供給する手段を更に有する請求項１２に記載の油分含有廃液からの油分回収装置。

          13. The oil recovery device from oil-containing waste liquid according to claim 12, further comprising means for supplying the oil recovered by the oil-containing waste liquid to the oil-containing waste liquid discharge site as an energy source.
PCT/JP2023/017735 2022-05-30 2023-05-11 Method and device for recovering oil from oil-containing waste liquid WO2023233960A1 (en)

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