JP3089090B2 - Solvent refining method for lubricating oil fraction - Google Patents
Solvent refining method for lubricating oil fractionInfo
- Publication number
- JP3089090B2 JP3089090B2 JP04086162A JP8616292A JP3089090B2 JP 3089090 B2 JP3089090 B2 JP 3089090B2 JP 04086162 A JP04086162 A JP 04086162A JP 8616292 A JP8616292 A JP 8616292A JP 3089090 B2 JP3089090 B2 JP 3089090B2
- Authority
- JP
- Japan
- Prior art keywords
- solvent
- extraction
- lubricating oil
- oil
- oil fraction
- 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
Landscapes
- Lubricants (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は石油系潤滑油基油の製造
工程における潤滑油留分の溶剤精製方法に関する。さら
に詳しくは、原料油に抽出溶剤の一部をプレダイリュー
ション溶剤として注入した後、溶剤抽出塔で溶剤抽出を
行うことを特徴とする潤滑油留分の溶剤精製方法に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for purifying a solvent for a lubricating oil fraction in a process for producing a petroleum-based lubricating base oil. More specifically, the present invention relates to a solvent refining method for a lubricating oil fraction, which comprises injecting a part of an extraction solvent into a feedstock oil as a predilution solvent and then extracting the solvent in a solvent extraction tower.
【０００２】[0002]
【従来の技術】一般に、原油から潤滑油基油を製造する
には、まず原油を常圧蒸留し、その残油をさらに減圧蒸
留することによって、低粘度から高粘度までの各種潤滑
油留分および減圧蒸留残油に分離する。減圧蒸留残油か
ら重質潤滑油留分（ブライトストック）を得るには減圧
蒸留残油を溶剤により処理し、アスファルト分を除去す
る。ブライトストックを含むこれら各種粘度の潤滑油留
分は溶剤精製、水素化精製、脱ろう等の工程により処理
され、潤滑油基油が製造される。2. Description of the Related Art In general, in order to produce a lubricating base oil from crude oil, first, crude oil is distilled at normal pressure, and the residual oil is further distilled under reduced pressure to obtain various lubricating oil fractions from low to high in viscosity. And vacuum distillation bottoms. In order to obtain a heavy lubricating oil fraction (bright stock) from the vacuum distillation residue, the vacuum distillation residue is treated with a solvent to remove asphalt components. The lubricating oil fractions of various viscosities, including bright stock, are processed through processes such as solvent refining, hydrorefining, and dewaxing to produce a lubricating base oil.
【０００３】かかる製造工程のうち、溶剤精製工程は潤
滑油留分中の芳香族化合物とくに多環芳香族化合物、硫
黄化合物等、潤滑油基油として不適当な成分を溶剤の選
択的な溶解力を利用して分離除去する工程をいう。溶剤
精製用の溶剤としては一般にフルフラール、フェノー
ル、Ｎ−メチルピロリドン等が使用されており、原料油
は抽出塔下部または中部から入り、塔上部から入って下
降するこれらの抽出溶剤と密度差により向流接触しなが
ら上昇する。この向流接触により、潤滑油留分中の芳香
族化合物、硫黄化合物等がフルフラール溶剤等の抽出溶
剤中に抽出される。塔頂から得られたラフィネートには
多少の抽出溶剤が含まれているので、かかる溶剤を除去
する。[0003] Among these production processes, the solvent refining process involves selectively dissolving an aromatic compound in a lubricating oil fraction, particularly a polycyclic aromatic compound, a sulfur compound or the like, which is unsuitable as a lubricating oil base oil, in a solvent. Refers to the step of separating and removing by using Generally, furfural, phenol, N-methylpyrrolidone, and the like are used as solvents for solvent refining, and the feedstock oil enters from the lower or middle part of the extraction tower, enters from the upper part of the tower, descends due to the difference in density with these extraction solvents. It rises while making flow contact. By this countercurrent contact, aromatic compounds, sulfur compounds and the like in the lubricating oil fraction are extracted into an extraction solvent such as a furfural solvent. Since the raffinate obtained from the top contains some extraction solvent, such solvent is removed.
【０００４】抽出条件は主に原料油に対する溶剤比と抽
出温度で定められる。溶剤比は必要とするラフィネート
の品質から決められ、溶剤比の増加に伴いラフィネート
の粘度指数が向上するが、収率と粘度が低下する。ま
た、抽出温度は高温になるほど抽出溶剤の溶解力が大き
く、また、低温であるほど選択性を増すため、溶剤比と
共にラフィネートの品質を決める上で大切な条件となっ
ている。先行技術は抽出溶剤としてフルフラールを広く
用いている。フルフラールの場合、原料油１容量部に対
して０．５〜５容量部の溶剤が抽出塔で向流接触するよ
うに、また、抽出温度は抽出塔頂部で６０〜１５０℃、
抽出塔底部でそれより２０〜８０℃低い温度で行われて
いる。[0004] The extraction conditions are mainly determined by the solvent ratio to the feedstock oil and the extraction temperature. The solvent ratio is determined from the required quality of the raffinate. As the solvent ratio increases, the viscosity index of the raffinate improves, but the yield and the viscosity decrease. Further, the higher the extraction temperature, the higher the solubility of the extraction solvent, and the lower the temperature, the higher the selectivity. Therefore, it is an important condition for determining the quality of the raffinate together with the solvent ratio. The prior art widely uses furfural as an extraction solvent. In the case of furfural, 0.5 to 5 parts by volume of the solvent is brought into countercurrent contact with the extraction column with respect to 1 part by volume of the feed oil, and the extraction temperature is 60 to 150 ° C at the top of the extraction column.
It is carried out at a temperature 20 to 80 ° C. lower at the bottom of the extraction column.
【０００５】[0005]
【発明が解決しようとする課題】潤滑油留分の溶剤精製
工程においてラフィネートの収率の向上を図ることは潤
滑油基油の増産および製造コストの低減を図る上で重要
であるが、従来技術では収率の向上を図るとラフィネー
トの品質が低下する傾向があった。本発明は品質を低下
させることなく、ラフィネートの収率の向上を図ること
のできる、改良された潤滑油留分の溶剤精製方法を提供
することを目的とする。It is important to improve the yield of raffinate in the solvent refining process of the lubricating oil fraction in order to increase the production of the lubricating base oil and reduce the production cost. Thus, when the yield was improved, the quality of the raffinate tended to decrease. An object of the present invention is to provide an improved method for purifying a solvent for a lubricating oil fraction, which can improve the raffinate yield without lowering the quality.
【０００６】[0006]
【課題を解決するための手段】本発明者らは前記目的を
達成すべく種々研究を進めた結果、溶剤精製工程におい
て抽出塔とくに回転円板塔で原料油と抽出溶剤の向流接
触を行う際、抽出溶剤の一部をプレダイリューション溶
剤として原料油ラインに注入することによりラフィネー
トの収率向上が図れることを見出した。本発明は潤滑油
留分の溶剤精製法の改良に関するもので、原料油、抽出
溶剤、溶剤抽出装置、抽出温度等については従来の技術
を適用するものであり、抽出溶剤の注入方法を改良した
ものである。Means for Solving the Problems The present inventors have conducted various studies in order to achieve the above object, and as a result, in the solvent refining process, the feed oil and the extraction solvent are brought into countercurrent contact with each other in an extraction tower, particularly a rotating disk tower. At that time, it was found that the raffinate yield could be improved by injecting a part of the extraction solvent as a pre-dilution solvent into the feed oil line. The present invention relates to an improvement in a method for refining a solvent for a lubricating oil fraction, in which a conventional technique is applied to a raw material oil, an extraction solvent, a solvent extraction device, an extraction temperature, and the like, and the injection method of the extraction solvent is improved. Things.
【０００７】すなわち、本発明は従来法における使用溶
剤と同量の溶剤を用いるが、あらかじめ抽出溶剤の一部
を原料油ラインにプレダイリューション溶剤として注入
し、この原料油とプレダイリューション溶剤の混合物を
抽出塔下部又は中部から入れ、また、抽出溶剤の残部を
抽出塔上部から入れて、抽出塔で原料油と溶剤を向流接
触させる。プレダイリューション溶剤の原料油ラインへ
の注入は定量ポンプを用いて行うだけでもよいが、原料
油とプレダイリューション溶剤が抽出塔に入る前に十分
混合するように定量ポンプのほかラインにスタティック
ミキサーを設けてもよい。That is, in the present invention, the same amount of solvent as that used in the conventional method is used, but a part of the extraction solvent is previously injected into the feed oil line as a pre-dilution solvent. The mixture of the solvent is introduced from the lower part or the middle part of the extraction tower, and the remainder of the extraction solvent is introduced from the upper part of the extraction tower. Injection of the pre-dilution solvent into the feed oil line may be performed only by using a metering pump.However, the feed oil and the pre-dilution solvent must be injected into the line in addition to the metering pump so that they can be mixed well before entering the extraction column. A static mixer may be provided.
【０００８】プレダイリューション溶剤は原料油の３〜
４０容量％が好ましい。３容量％より少ないと溶剤のプ
レダイリューションによる効果が現れず、また、４０容
量％を越えると抽出塔において原料油と溶剤が十分向流
接触せず、逆に抽出効率が悪くなる。このプレダイリュ
ーション溶剤の使用によるラフィネートの収率向上効果
は原料油の粘度が高い場合に特に高い。これは原料油が
高粘度になるほど密度が高く抽出溶剤との密度差が小さ
くなり、抽出塔内において本来密度差で上昇する原料油
の一部が溶剤に随伴して逆に下降し、エキストラクトに
混入するためである。[0008] The predilution solvent is 3 to
40% by volume is preferred. If the amount is less than 3% by volume, the effect of the predilution of the solvent will not be exhibited, and if it exceeds 40% by volume, the raw material oil and the solvent will not be brought into sufficient countercurrent contact in the extraction tower, and conversely the extraction efficiency will be poor. The effect of improving the yield of raffinate by using the predilution solvent is particularly high when the viscosity of the feedstock oil is high. This is because the higher the viscosity of the base oil, the higher the density and the difference in density with the extraction solvent become smaller. This is because it is mixed in.
【０００９】[0009]
【実施例】以下、本発明を実施例により詳細に説明する
が、本発明はこれらの実施例に限定されるものではな
い。 （実施例）原油の常圧残油を減圧蒸留した残油をプロパ
ン脱れき法により得られたブライトストック（密度 0.9
01g/cm3 ＠15℃，動粘度 31.5 cSt ＠100 ℃, 50％留出
温度 610℃）を原料油とし、２６の円板を有する回転円
板塔の抽出塔中部へ１時間に３２．５ kl （＠15℃）注
入した。一方、プレダイリューション溶剤としてフルフ
ラールをその原料油ラインへ１時間に３．５ kl （＠15
℃）注入した。一方、フルフラールを１時間に８５．２
kl の割合で抽出塔上部へ入れ、塔頂温度１３４℃，塔
底温度６９℃で向流接触を行った。塔頂から出たラフィ
ネートはフルフラールを含んでいるので、後段のストリ
ッパーで溶剤を回収した。回収ラフィネートは原料油の
７４．８容量％に当る１時間当り２４．３ kl であっ
た。なお、ラフィネートの品質と相関のある屈折率は８
０℃で１．４８０４であった。EXAMPLES Hereinafter, the present invention will be described in detail with reference to examples, but the present invention is not limited to these examples. (Example) Bright stock (density 0.9) obtained by distillation of a crude oil under atmospheric pressure under reduced pressure to obtain a residue
01g / cm 3 at 15 ° C, kinematic viscosity 31.5 cSt at 100 ° C, 50% distilling temperature 610 ° C) as feed oil, and 32.5 / hour into the center of the extraction column of a rotating disk tower having 26 disks. kl (＠ 15 ° C.) was injected. On the other hand, furfural as a pre-dilution solvent was transferred to the feed oil line at 3.5 kl / hour ($ 15
C). On the other hand, furfural was fed 85.2 per hour.
The mixture was introduced into the upper part of the extraction column at a rate of kl, and countercurrent contact was performed at a top temperature of 134 ° C and a bottom temperature of 69 ° C. Since the raffinate discharged from the top contains furfural, the solvent was recovered by a subsequent stripper. The recovered raffinate was 24.3 kl per hour, which was 74.8% by volume of the feedstock. The refractive index correlated with the quality of the raffinate is 8
It was 1.4804 at 0 degreeC.
【００１０】（比較例）前記実施例においてプレダイリ
ューション溶剤を用いず、抽出塔上部へフルフラールを
１時間に８８．７ kl （実施例におけるプレダイリュー
ション溶剤と抽出溶剤の合計量）をチャージしたこと以
外は同様の条件で溶剤抽出を行った。溶剤回収後のラフ
ィネートは原料油の７３．５容量％に当る１時間当り２
３．９klであった。なお、このラフィネートの屈折率は
８０℃で１．４８０４であった。(Comparative Example) In the above example, without using the pre-dilution solvent, furfural was fed to the upper part of the extraction column at 88.7 kl / h (total amount of the pre-dilution solvent and the extraction solvent in the example). Solvent extraction was carried out under the same conditions except for charging. After the solvent is recovered, the raffinate has an amount of 73.5% by volume of the base oil, that is, 2 per hour.
It was 3.9 kl. The refractive index of this raffinate was 1.4804 at 80 ° C.
【００１１】[0011]
【発明の効果】本発明を実施することにより、潤滑油留
分の溶剤精製工程におけるラフィネートの収率を、品質
を低下させることなく、従来法に比べて１〜２ポイント
向上させることができるという効果を奏する。According to the present invention, the yield of raffinate in the solvent refining process of a lubricating oil fraction can be improved by one to two points compared to the conventional method without lowering the quality. It works.
フロントページの続き (56)参考文献 特開 昭49−93105（ＪＰ，Ａ) 特開 昭58−159804（ＪＰ，Ａ) 特開 平３−181594（ＪＰ，Ａ) 特開 昭62−236889（ＪＰ，Ａ) 特開 昭56−26981（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) C10G 21/16 C10G 21/20 C10G 7/08 Continuation of the front page (56) References JP-A-49-93105 (JP, A) JP-A-58-159804 (JP, A) JP-A-3-181594 (JP, A) JP-A-62-236889 (JP, A) , A) JP-A-56-26981 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) C10G 21/16 C10G 21/20 C10G 7/08
Claims (2)
滑油留分から主として多環芳香族化合物および硫黄化合
物などを除去する溶剤精製方法であって、溶剤抽出塔へ
の原料油ラインに抽出溶剤の一部をプレダイリューショ
ン溶剤として注入することを特徴とする潤滑油留分の溶
剤精製方法。1. A solvent refining method for mainly removing polycyclic aromatic compounds and sulfur compounds from a lubricating oil fraction in a petroleum-based lubricating oil base oil production process, wherein an extraction solvent is supplied to a feed oil line to a solvent extraction column. A method for purifying a solvent for a lubricating oil fraction, wherein a part of the solvent is injected as a predilution solvent.
た、抽出溶剤としてフルフラール、フェノールまたはＮ
−メチルピロリドンのうちいずれか１種類を用い、原料
油ラインに注入する溶剤量を原料油である潤滑油留分の
３〜４０容量％とする請求項１記載の方法。2. A rotary disk column as a solvent extraction device, and furfural, phenol or N as an extraction solvent.
The method according to claim 1, wherein the amount of the solvent to be injected into the feed oil line is 3 to 40% by volume of the lubricating oil fraction as the feed oil, using any one of methylpyrrolidone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04086162A JP3089090B2 (en) | 1992-03-10 | 1992-03-10 | Solvent refining method for lubricating oil fraction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04086162A JP3089090B2 (en) | 1992-03-10 | 1992-03-10 | Solvent refining method for lubricating oil fraction |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06116576A JPH06116576A (en) | 1994-04-26 |
| JP3089090B2 true JP3089090B2 (en) | 2000-09-18 |
Family
ID=13879055
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04086162A Expired - Lifetime JP3089090B2 (en) | 1992-03-10 | 1992-03-10 | Solvent refining method for lubricating oil fraction |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3089090B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4495791B2 (en) * | 1998-07-03 | 2010-07-07 | 日揮株式会社 | Combined cycle power generation system |
| CN102206506B (en) * | 2010-03-31 | 2014-04-30 | 中国石油化工股份有限公司 | Preparation method for aromatic rubber oil |
| CN106867568B (en) * | 2015-12-10 | 2018-07-13 | 中国石油天然气股份有限公司 | Double tank pre-extracted devices and double tank pre-extracted methods |
| CN114177657B (en) * | 2021-12-23 | 2023-03-10 | 安徽国孚凤凰科技有限公司 | Coalescence-separation type saturated oil separation recovery device and method for base oil solvent extraction extract |
-
1992
- 1992-03-10 JP JP04086162A patent/JP3089090B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06116576A (en) | 1994-04-26 |
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