摘要 |
A fuel composition having reduced tendency to discoloration at high temperatures comprises kerosine and/or is a jet fuel, and also comprises a cyclic compound comprising m units of formula (Ia) and n units of formula (Ib) joined together to form a ring, wherein Y is a divalent bridging group which may be the same or different in each unit; R<SP>0</SP> is H or (C<SB>1</SB>-C<SB>6</SB>) alkyl; R<SP>5</SP> is H or (C<SB>1</SB>-C<SB>60</SB>) alkyl; and j is 1 or 2; R<SP>3</SP> is hydrogen, a hydrocarbyl or a hetero-substituted hydrocarbyl group; each of R<SP>1</SP>, R<SP>2</SP> and R<SP>4</SP>, which may be the same of different, is hydroxyl, hydrogen, hydrocarbyl or hetero-substituted hydrocarbyl, with the proviso that at least one of R<SP>1</SP>, R<SP>2</SP>, R<SP>4</SP> is hydroxyl, and m + n is 4 to 20, m is 1-8 and n is at least 3 and preferably either R<SP>1</SP> is hydroxyl and R<SP>2</SP> and R<SP>4</SP> are independently either hydrogen, hydrocarbyl or hetero-substituted hydrocarbyl, or R<SP>2</SP> and R<SP>4</SP> are hydroxyl and R<SP>1</SP> is either hydrogen, hydrocarbyl or hetero-substituted hydrocarbyl; and m + n is from 4 to 20, m is from 1 to 8 and n is at least 3. |