Process for hydroisomerising a hydrocarbon feed

A process for increasing the yield of a base oil produced by hydroisomerising a hydrocarbon feed, the process comprising:

• combining a hydrocarbon feed and a hydroisomerisation additive to provide a combined feed;
• and
• contacting the combined feed with a hydroisomerisation catalyst comprising zeolite SSZ-91 to form a base oil product,
• wherein the hydroisomerisation additive is a substituted or unsubstituted nitrogen heterocycle according to formula I,
• wherein,
• R1 is selected from hydrogen, C1-10 alkyl, hydroxyl, C1-10 alkoxy, C1-10 carboxyl;
• and
• R2 and R3 are independently selected from hydrogen, C1-10 alkyl, hydroxyl, C1-10 alkoxy, C1-10 carboxyl and —NR′R″, where R′ and R″ are independently H or C1-10 alkyl;
• and
• wherein the yield of the base oil product is improved by at least 1.0 wt. % compared to the process conducted in the absence of the hydroisomerisation additive.

A process for improving the yield of a base oil produced by contacting a hydrocarbon feed and a hydroisomerisation catalyst, the process comprising combining the hydrocarbon feed with a hydroisomerisation additive to form a combined feed and contacting the combined feed and the hydroisomerisation catalyst,

• wherein the hydroisomerisation additive is a substituted or unsubstituted nitrogen heterocycle according to formula I,
• wherein,
• R1 is selected from hydrogen, C1-10 alkyl, hydroxyl, C1-10 alkoxy, C1-10 carboxyl;
• and
• R2 and R3 are independently selected from hydrogen, C1-10 alkyl, hydroxyl, C1-10 alkoxy, C1-10 carboxyl and —NR′R″, where R′ and R″ are independently H or C1-10 alkyl;
• and
• the hydroisomerisation catalyst comprises zeolite SSZ-91.