isomerization Sample Clauses

isomerization. For the purposes of heading Nos 2710, 2711 and 2712, the 'specific processes` are the following: (a) vacuum distillation; (b) redistillation by a very thorough fractionation process; (c) cracking; (d) reforming; (e) extraction by means of selective solvents; (f) the process comprising all the following operations: processing with concentrated sulphuric acid, oleum or sulphuric anhydride; neutralization with alkaline agents; decolorization and purification with naturally active earth, activated earth, activated charcoal or bauxite; (g) polymerization; (h) alkylation; (ij) isomerization; (k) (in respect of heavy oils falling within heading No ex 2710 only) desulphurization with hydrogen resulting in a reduction of at least 85 % of the sulphur content of the products processed (ASTM D 1266-59 T method); (l) (in respect of products falling within heading No 2710 only) deparaffining by a process other than filtering; (m) (in respect of heavy oils falling within heading No ex 2710 only) treatment with hydrogen at a pressure of more than 20 bar and a temperature of more than 250 °C with the use of a catalyst, other than to effect desulphurization, when the hydrogen constitutes an active element in a chemical reaction. The further treatment with hydrogen of lubricating oils of heading No ex 2710 (e.g. hydrofinishing or decolorization) in order, more especially, to improve colour or stability shall not, however, be deemed to be a specific process; (n) (in respect of fuel oils falling within heading No ex 2710 only) atmospheric distillation, on condition that less than 30 % of these products distils, by volume, including losses, at 300 °C by the ASTM D 86 method; (o) (in respect of heavy oils other than gas oils and fuel oils falling within heading No ex 2710 only) treatment by means of a high-frequency electrical brush-discharge.