| 摘要 |
The invention provides a lubricity additive in the form of an ester of an ac id and an alcohol, wherein the acid is an aromatic mono-, di- or polyhydric, mo no- , di- or polycarboxylic acid or mixture thereof, which may be alkylated and/ or alkoxylated and wherein the alkyl and/or alkoxy groups, if any, are independently selected from groups having from 1 to 30 carbon atoms, characterised in that (a) the alcohol is glycerol, and (b) the mole percent of acid groups in the lubricity additive is less than 10 %, based on the total of acid and ester groups. The invention also provides a process for preparing t he lubricity additive, and a middle distillate fuel oil having a sulphur concentration of 0.2 % by weight or less, and a minor portion of the lubrici ty additive. |
