| 摘要 |
Dialkylnaphthalenes prepared by reacting an olefin with a mixture of a monoalkylnaphthalene, naphthalene and a catalyst comprising aluminium chloride and a proton donor (see Division C5) may be sulphonated by treatment with chlorosulphonic acid or preferably with oleum in n-hexane solution. In an example the dinonylnaphthalenes prepared in other examples are sulphonated in n-hexane with 20% oleum, the sulphonation mixture quenched with water, the spent acid settled and separated. the resulting hexane solution clay-treated, de-gassed, filtered, neutralised and stripped of solvent to give a sodium sulphonates.ALSO:Dialkylnaphthalenes are prepared by a process comprising the steps of (a) adding to a reaction zone, while maintaining the temperature at about 25 DEG to 65 DEG C., naphthalene, a monoalkylnaphthalene fraction, and a catalyst comprising aluminium chloride and a promoter (i.e. a substance capable of donating a proton to the aluminium chloride), (b) adding an olefin to the reaction zone while agitating the mixture and maintaining the temperature thereof at about 25 DEG to 65 DEG C., and (c) recovering from said reaction mass a paraffinic hydrocarbon fraction, a naphthalene fraction, a monoalkylnaphthalene fraction and a dialkylnaphthalene fraction. The preferred olefin is nonene and the monoalkylnaphthalene used preferably corresponds to the olefin. The monoalkylnaphthalene obtained from stage (c) is preferably recycled. Specified promoters are anhydrous hydrogen chloride and water. The dialkylnaphthalenes may be sulphonated (see Division C2). In examples, dinonylnaphthalenes are prepared by the above method and also by prior art processes for comparison. |
