Liquid phase additive for use in thermal cracking process to improve product yields

A process for preparing a liquid phase additive, comprising

• (i) providing an alkyl nitrate in a reactor and stirring the same;
• (ii) adding a petroleum sulphonates;
• an aliphatic, aromatic, cyclohexylamines or hetroalkylated lower amines;
• a hindered phenol based compounds;
• a phosphate esters;
• and an aliphatic alcohols, in to the reactor of step (i) while stirring;
• (iii) heating the contents of step (ii) to 40-50° C. and stirring for 30 minutes;
• and
• (iv) cooling the contents of step (iii) to ambient temperature to obtain the liquid phase additive.

A process for thermal cracking of petroleum residue by delayed coking, the process comprising the steps of:

• (a) feeding a hydrocarbon feedstock in a delayed coker reactor unit,
• (b) adding a liquid phase additive comprising an alkyl nitrate;
• a petroleum sulphonates;
• an aliphatic, aromatic, cyclohexylamines or hetroalkylated lower amines;
• a hindered phenol based compounds;
• a phosphate esters;
• and an aliphatic alcohols, and
• (c) heating the reactor at a predetermined heating rate.