Abstract: An adsorbent for separating gases, which comprises a binder and a crystalline low-silica faujasite type zeolite with a SiO2/Al2O3 molar ratio of from 1.9 to 2.1, wherein the average pore diameter of the macropores is equal to or larger than the mean free path of an adsorbable component when desorbing the adsorbable component from the adsorbent, and at least 70% of the total volume of the macropores is occupied by macropores having a diameter equal to or larger than the mean free path of the adsorbable component.

Abstract: Ethyleneamines are recovered from an aqueous solution of carbonates of ethyleneamines by distilling an aqueous solution of carbonates of ethyleneamines including ethylenediamine, in which the molar ratio of the carbon dioxide component to the ethyleneamines including ethylenediamine is 0.01 to 0.5, whereby ethylenediamine is distilled out together with water. The aqueous solution to be distilled is advantageously prepared by heating an aqueous solution of carbonates of ethyleneamines including ethylenediamine to effect decarboxylation.

Abstract: An apparatus for determining carbon contents in molten metal comprising an entrance chamber with an entry port in a side wall, a sampling chamber, a ring-shaped disk to be set between both chambers and a temperature sensing means which is protected from the flowing sample metal by a protective thermal insulation member, protruding through the entrance chamber to the sampling chamber. The molten metal flowing from the entry port is cooled by contacting with the protective thermal insulation member. The insulation member will turn to be a riser when the sample metal starts solidifying in the sampling chamber. Thus enabling precise rapid carbon determination and simultaneously offering appropriate specimen for spectrographic analysis.