Composition comprising esters of lignin and oil or fatty acids

A composition comprising a carrier liquid and lignin or lignin derivatives solubilized in said carrier liquid;

• wherein the hydroxyl groups of the lignin or lignin derivatives have been substituted with ester groups forming esterified lignin or lignin derivatives and wherein the degree of substitution is more than 30%, wherein the ester groups are C8 or longer groups and wherein the amount of the esterified lignin or lignin derivative in composition is 1 weight % or more;
• and wherein the carrier liquid is a gas oil.