Process oil, process for production of deasphalted oil, process for production of extract, and process for production of process oil

A process oil obtained by mixing:

• an extract obtained by deasphalting and solvent-extracting a vacuum residual oil of a crude oil;
• and a lubricant base oil having a polycyclic aromatics (PCA) content of less than 3 mass %, the process oil comprising properties of:
• (a) a polycyclic aromatics (PCA) content of less than 3 mass %;
• (i) a viscosity (100° C.) of 30 to 80 mm2/s;
• (j) an aniline point of 90° C. or lower;
• (k) a flash point of 240° C. or higher;
• (l) a benzo(a)pyrene content of 1 mass ppm or less;
• (m) a specified aromatic compound content of 10 mass ppm or lower;
• and
• (n) a polar substance content of 10 to 30 mass %.

A manufacturing method of a process oil, comprising:

• a deasphalting step for deasphalting a vacuum residual oil of a crude oil to obtain a deasphalted oil;
• and
• a solvent-extraction step for solvent-extracting the deasphalted oil to obtain an extract;
• wherein
• the extract obtained in the solvent-extraction step and at least one member selected from the group consisting of the deasphalted oil obtained in the deasphalting step and a mineral oil having a polycyclic aromatics (PCA) content of less than 3 mass % are mixed to obtain a mixed oil, the mixed oil being provided as the process oil.

A manufacturing method of a process oil, comprising:

• a deasphalting step for deasphalting a vacuum residual oil of a crude oil to obtain a deasphalted oil;
• a dewaxing step for dewaxing the deasphalted oil to obtain a dewaxed oil;
• and
• a solvent-extraction step for solvent-extracting the dewaxed oil to obtain an extract with a yield of 50 mass % or higher of the deasphalted oil, the extract being provided as the process oil.

A manufacturing method of a process oil, comprising:

• a deasphalting step for deasphalting a vacuum residual oil of a crude oil to obtain a deasphalted oil;
• a dewaxing step for dewaxing the deasphalted oil to obtain a dewaxed oil;
• and
• a solvent-extraction step for solvent-extracting the dewaxed oil to obtain an extract, wherein
• the extract obtained in the solvent-extraction step and at least one member selected from the group consisting of the dewaxed oil obtained in the dewaxing step and a mineral oil having a polycyclic aromatics (PCA) content of less than 3 mass % are mixed to obtain a mixed oil, the mixed oil being provided as the process oil.

A manufacturing method of a deasphalted oil using as a raw material a vacuum residual oil of a crude oil, the deasphalted oil having properties of (a), (l) and (m) below, the method comprising:

• deasphalting the vacuum residual oil using as a solvent a propane or a mixed solvent of a butane and a propane under conditions of:
• a solvent ratio of 4.5 to 6;
• a column top temperature of 85 to 100° C.;
• and a yield for the deasphalted oil of 30 to 40 vol %, the properties being:
• (a) a polycyclic aromatics (PCA) content of less than 3 mass %;
• (l) a benzo(a)pyrene content of 1 mass ppm or less;
• and
• (m) a specified aromatic hydrocarbon content of 10 mass ppm or less.

A manufacturing method of an extract using as a raw material a deasphalted oil obtained by deasphalting a vacuum residual oil of a crude oil, the extract having properties of (l) and (m) below, the method comprising:

• solvent-extracting the deasphalted oil under conditions of:
• an extraction temperature of 80 to 150° C.;
• and a solvent ratio of 2.0 to 15.0, the properties being:
• (l) a benzo(a)pyrene content of 1 mass ppm or less;
• and
• (m) a specified aromatic hydrocarbon content of 10 mass ppm or less.

A manufacturing method of a process oil, comprising:

• a deasphalting step for deasphalting a vacuum residual oil of a crude oil to obtain a deasphalted oil;
• and
• a solvent-extraction step for solvent-extracting the deasphalted oil to obtain an extract, wherein
• the extract obtained in the solvent-extraction step and a lubricant base oil having a polycyclic aromatics (PCA) content of less than 3 mass % are mixed to obtain a mixed oil, the mixed oil being provided as the process oil.