Non-carcinogenic bright stock extracts and deasphalted oils

A substantially non-carcinogenic deasphalted oil produced from a reduced hydrocarbon crude feedstock by a process which comprises the steps of:

• (a) establishing a functional relationship by regression between mutagenicity index and a deasphalted oil physical property indicative of mutagenicity for a deasphalted oil process stream;
• (b) determining from said relationship a critical physical property level which, when achieved, a deasphalted oil having a mutagenicity index of less than about 1.0 results, said critical property being the physical property which yields a value of mutagenicity index equal to about 1.0;
• (c) setting process conditions to produce a deasphalted oil achieving said critical physical property level;
• and
• (d) producing a deasphalted oil, said deasphalted oil producing step comprising:
• (i) passing the reduced feedstock into a vacuum distillation column wherein the feedstock is separated into at least one product of distillation and a vacuum residuum byproduct;
• and
• (ii) passing at least a fraction of said residuum byproduct through a selective solvent deasphalting unit to produce a deasphalted raffinate and an asphaltenic extract,
• wherein said deasphalted oil is substantially non-carcinogenic having a mutagenicity index of less than about 1.0.

A non-carcinogenic deasphalted oil substantially free from mutagenic activity produced from a reduced hydrocarbon crude feedstock by a process which comprises the steps of:

• (a) establishing a functional relationship by regression between mutagenicity index and a deasphalted oil physical property indicative of mutagenicity for a deasphalted oil process stream;
• (b) determining from said relationship a physical property level which, when achieved, a deasphalted oil having a mutagenicity index equal to about 0.0 results, said critical property being the physical property which yields a value of mutagenicity index equal to about 0.0;
• (c) setting process conditions to produce a deasphalted oil achieving said physical property level;
• and
• (d) producing a deasphalted oil, said deasphalted oil producing step comprising:
• (i) passing the reduced feedstock into a vacuum distillation column wherein the feedstock is separated into at least one product of distillation and a vacuum residuum byproduct;
• and
• (ii) passing at least a fraction of said residuum byproduct through a selective solvent deasphalting unit to produce a deasphalted raffinate and an asphaltenic extract,
• wherein said deasphalted oil is substantially free from mutagenic activity having a mutagenicity index of equal to about 0.0.

A substantially non-carcinogenic bright stock extract produced from a reduced hydrocarbon crude feedstock by a process which comprises the steps of:

• (a) establishing a functional relationship by regression between mutagenicity index and a bright stock extract physical property indicative of mutagenicity for a bright stock extract process stream;
• (b) determining from said relationship a critical physical property level which, when achieved, a bright stock extract having a mutagenicity index of less than about 1.0 results, said critical property being the physical property which yields a value of mutagenicity index equal to about 1.0;
• (c) setting process conditions to produce a bright stock extract achieving said critical physical property level;
• and
• (d) producing a bright stock extract, said bright stock extract producing step comprising:
• (i) passing the reduced feedstock into a vacuum distillation column wherein the feedstock is separated into at least one product of distillation and a vacuum residuum byproduct;
• (ii) passing at least a fraction of said residuum byproduct through a selective solvent deasphalting unit to produce a deasphalted raffinate and an asphaltenic extract;
• and,
• (iii) passing at least a fraction of said deasphalted raffinate through at least one selective solvent extraction unit to reduce said deasphalted raffinate's aromatic content and to produce a bright stock and the bright stock extract,
• wherein said bright stock extract is substantially non-carcinogenic having a mutagenicity index of less than about 1.0.

A non-carcinogenic bright stock extract substantially free from mutagenic activity produced from a reduced hydrocarbon crude feedstock by a process which comprises the steps of:

• (a) establishing a functional relationship by regression between mutagenicity index and a bright stock extract physical property indicative of mutagenicity for a bright stock extract process stream;
• (b) determining from said relationship a physical property level which, when achieved, a bright stock extract having a mutagenicity index equal to about 0.0 results, said critical property being the physical property which yields a value of mutagenicity index equal to about 0.0;
• (c) setting process conditions to produce a bright stock extract achieving said physical property level;
• and
• (d) producing a bright stock extract, said bright stock extract producing step comprising:
• (i) passing the reduced feedstock into a vacuum distillation column wherein the feedstock is separated into at least one product of distillation and a vacuum residuum byproduct;
• (ii) passing at least a fraction of said residuum byproduct through a selective solvent deasphalting unit to produce a deasphalted raffinate and an asphaltenic extract;
• and,
• (iii) passing at least a fraction of said deasphalted raffinate through at least one selective solvent extraction unit to reduce said deasphalted raffinate's aromatic content and to produce a bright stock and the bright stock extract,
• wherein said bright stock extract is substantially free from mutagenic activity having a mutagenicity index of equal to about 0.0.