Abstract: An apparatus and process for cryogenic separation of air are described which utilize a pipe distributor or a channel distributor for liquid distribution. The air separation apparatus contains a rectifying column having at least one section equipped with packing materials, wherein a liquid distributor is positioned thereabove. The main channel and/or the distributing channels of the liquid distributor are closed over at least a portion of their top. Also described is a liquid distributor for use in a mass transfer column.

Abstract: The invention relates, in particular, to the field of plastic bag treatment.The method consists in releasably connecting brackets 29 for holding together stacks 15 to a stack conveying device 21, stacking the individual bags 11 on the legs 31 of the brackets 29 in a stacking station 14 and then taking off the stacks 15 held together by the brackets 29 in a take-off station 22.The apparatus comprises the stack conveying device 21 to which the brackets 29 are connected by a releasable holding device in such a way that each stack 15 can be taken together with the bracket 29 off the stack conveying device in the take-off station 22. The brackets 29 are fed to the stack conveying device 21 in a bracket delivery station 70 preceding the stacking station 14. The legs 31 of the brackets 29 then serve in the stacking station 14 as wicketing pins on which the individual bags 11 are stacked.