9This work reports the production of di-n-butyl ether (DNBE) by means of 1-butanol dehydration 10 in the liquid phase on acidic ion-exchange resins. Dehydration experiments were performed at 11 150 ºC and 40 bar on 13 styrene-codivinylbenzene ion exchangers of different morphology. By 12 comparing 1-butanol conversions to DNBE and initial reaction rates it is concluded that 13 oversulfonated resins are the most active catalysts for 1-butanol dehydration reaction whereas 14 gel-type resins that swell significantly in the reaction medium as well as the macroreticular 15 thermostable resin Amberlyst-70 are the most selective to DNBE. The highest DNBE yield was 16 achieved on Amberlyst 36. The influence of typical 1-butanol impurities on the dehydration 17 reaction were also investigated showing that the presence of 2-methyl-1-propanol (isobutanol) 18 enhance the formation of branched ethers such as 1-(1-methylpropoxy) butane and 1-(2-19 methylpropoxy) butane, whereas the presence of ethanol and acetone gives place to ethyl butyl 20 ether and, in much lesser extent, diethyl ether. 21

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