WCO Explanatory Notes reproduced for reference. © World Customs Organization. Verify against official WCO publication.
29.04 - Sulphonated, nitrated or nitrosated derivatives of hydrocarbons, whether or not halogenated. 2904.10 - Derivatives containing only sulpho groups, their salts and ethyl esters 2904.20 2904.90 - Derivatives containing only nitro or only nitroso groups - Other (A) SULPHONATED DERIVATIVES These are hydrocarbons in which one or more atoms of hydrogen have been re laced by a like number of sulpho group (-SO3@; they are generally called sulphonic acids. T e heading also includes salts and ethyl esters of sulphonic acids (see Note 5 (B) to this Chapter). R (1) Sulphonated derivatives of acyclic hydrocarbons. (a) Ethylenesulphonic acid. (b) Ethanesulphonic acid. (2) Sulphonated derivatives of cyclic hydrocarbons. (a) Benzenesulphonic acid. (b) Toluenesulphonic acids (sometimes erroneously called benzylsulphonic acids). (c) Xylenesulphonic acids. (d) Benzenedisulphonic acids. (e) Naphthalenesulphonic acids. (B) NITRATED DERIVATIVES These are hydrocarbons in which one or more hydrogen atoms have been replaced by a like number of rutro groups (-NOz). (1) Nitrated derivatives of acyclic hydrocarbons. (a) Nitromethane. (b) Nitroethane. (c) Nitropropane. (d) Trinitromethane, etc. (2) Nitrated derivatives of cyclic hydrocarbons. (a) Nitrobenzene (oil of mirbane). Shining ellow crystals or oily yellowish liquid, with the odour of bitter almonds; used in pe&ery, in soap-making, in organic synthesis, as a denaturing agent, etc. (b) m-Dinitrobenzene.Colourless needles or flakes; used for the prepamtion of explosives. (c) Nitrotoluene (0-, m- andp-). (d) 2,4-Dinitrotoluene Crystals used in the manufacture of explosives. (e) 2,4,6-Trinitrotoluene. Powerful explosive. Prepared explosive mixtures of these derivatives are excluded (heading 36.02). (0 5-tert-Eutyl-2,4,6-trinitrometaxylene (xylene musk); used in perfumery. (g) Nitroxylene, 3-tert-butyl-2,6-diiitro-p-cymene (cymene musk), nitronaphthalene, etc. (C) NITROSATED DERIVATIVES These are hydrocarbons in which one or more atoms of hydrogen have been replaced by a like number of nitroso groups (-NO). (I) Nitrosobenzene. (2) Nitrosotoluene (0-, m- andp-). (D) SULPHOHALOGENATED DEIUWATIVES These are hydrocarbon derivatives the molecules of which contain one or more sudpho groups (-SO&) or salts or ethyl esters thereof and one or more halogens, ca else a halosulphonyl group. (1) Chloro-, bromo- and iodobenzenesulphonic acids (o-, m andp-). (2) Chloro-, bromo- and iodobenzenedisulphonic acids. (3) Chloronaphthalenesulphonicacids. (4) p-Toluenesulphonyl chloride. (E) NITROHALOGENATED DERIVATIVES These are hydrocarbon derivatives the molecules of which contain one or more nitro groups (-NOz) and one or more halogens. (1) Trichloronitromethane or chloropicrin. (2) Iodotrinitromethane (iodopicrin). (3) Chloronitromethane. (4) Bromonitromethane. (5) Iodonitromethane. (6) Chloronitrobenzene. (7) Chloronitrotoluene. (F) NITROSULPHONATED DERIVATIVES These are hydrocarbon derivatives the molecules of which contain one or more nitro groups (-NO2) and one or more sulpho groups (-S03H) or salts or ethyl esters thereof. (1) Nitrobenzenesulphonic and di- and trinitrobenzenesulphonic acids. (2) Nitrotoluenesulphonic and di- and trinitrotoluenesulphonic acids. (3) Nitronaphthalenesulphonicacids. (4) DinitrostiIbenedisulphonic acids. (G) NITROSULPHOH&OGENATED OR OTHER COMPOUND DERIVATIVES These are compound derivatives of a kind not specified above, for example, those which contain one or more mtro groups (-NOz), sulpho groups -S03H) or salts or eth 1 esters thereof and one or more halo ens. Specific examples are the sulp onated derivatives o chloronitrobenzenes, of chloronitroto uenes, etc. f B Sub-chapter I1 ALCOHOLS AND THEIR HALOGENATED, SULPHONATED, NITRATED OR NITROSATED DERIVATIVES
1.- Except where the context otherwise requires, the headings of this Chapter apply only to : (a) Separate chemically defined organic compounds, whether or not containing impurities; (b) Mixtures of two or more isomers of the same organic compound (whether or not containing impurities), except mixtures of acyclic hydrocarbon isomers (other than stereoisomers), whether or not saturated (Chapter 27); (c) The products of headings 29.36 to 29.39 or the sugar ethers, sugar acetals and sugar esters, and their salts, of heading 29.40, or the products of heading 29.41, whether or not chemically defined; (d) The products mentioned in (a), (b) or (c) above dissolved in water; (e) The products mentioned in (a), (b) or (c) above dissolved in other solvents provided that the solution constitutes a normal and necessary method of putting up these products adopted solely for reasons of safety or for transport and that the solvent does not render the product particularly suitable for specific use rather than for general use; (f) The products mentioned in (a), (b), (c), (d) or (e) above with an added stabiliser (including an anti- caking agent) necessary for their preservation or transport; (g) The products mentioned in (a), (b), (c), (d), (e) or (f) above with an added anti-dusting agent or a colouring or odoriferous substance or an emetic added to facilitate their identification or for safety reasons, provided that the additions do not render the product particularly suitable for specific use rather than for general use; (h) The following products, diluted to standard strengths, for the production of azo dyes : diazonium salts, couplers used for these salts and diazotisable amines and their salts. 2.- This Chapter does not cover : (a) Goods of heading 15.04 or crude glycerol of heading 15.20; (b) Ethyl alcohol (heading 22.07 or 22.08); (c) Methane or propane (heading 27.11); (d) The compounds of carbon mentioned in Note 2 to Chapter 28; (e) Immunological products of heading 30.02; (f) Urea (heading 31.02 or 31.05); (g) Colouring matter of vegetable or animal origin (heading 32.03), synthetic organic colouring matter, synthetic organic products of a kind used as fluorescent brightening agents or as luminophores (heading 32.04) or dyes or other colouring matter put up in forms or packings for retail sale (heading 32.12); (h) Enzymes (heading 35.07); (ij) Metaldehyde, hexamethylenetetramine or similar substances, put up in forms (for example, tablets, sticks or similar forms) for use as fuels, or liquid or liquefied-gas fuels in containers of a kind used for filling or refilling cigarette or similar lighters and of a capacity not exceeding 300 cm3 (heading 36.06); (k) Products put up as charges for fire-extinguishers or put up in fire-extinguishing grenades, of heading 38.13; ink removers put up in packings for retail sale, of heading 38.24; or (l) Optical elements, for example, of ethylenediamine tartrate (heading 90.01). 3.- Goods which could be included in two or more of the headings of this Chapter are to be classified in that one of those headings which occurs last in numerical order. 4.- In headings 29.04 to 29.06, 29.08 to 29.11 and 29.13 to 29.20, any reference to halogenated, sulphonated, nitrated or nitrosated derivatives includes a reference to compound derivatives, such as sulphohalogenated, nitrohalogenated, nitrosulphonated or nitrosulphohalogenated derivatives. Nitro or nitroso groups are not to be taken as “nitrogen-functions” for the purposes of heading 29.29. For the purposes of headings 29.11, 29.12, 29.14, 29.18 and 29.22, “oxygen function”, the characteristic organic oxygen-containing group of those respective headings, is restricted to the oxygen-functions referred to in headings 29.05 to 29.20.