Abstract: In producing alkanolamines by use of a microporous material as a catalyst, the difficulty in industrially performing the production because of the short lifetime of the catalyst is resolved. A process of regenerating the catalyst by removing an organic substance deposited on the catalyst by means of decomposing and/or extracting the substance is introduced, and thereby steady production is carried out substantially over the long term by switching the reaction and the regenerating processes.

Abstract: A industrially advantageous process for preparing dialkyl carbonates is provided. The process is characterized in that an alkylene carbonate and an alcohol are subjected to an transesterification in the presence of a catalyst which contains, as the catalytically active component, at least one rare-earth oxide. According to this process, the transesterification progresses rapidly due to the excellent activity of the catalyst, and the catalyst can be readily separated after termination of the reaction, allowing high efficiency isolation and purification of dialkyl carbonate.

Abstract: The present invention provides a novel process for producing an aminocarboxylic acid salt which is useful as a material for agricultural chemicals and drugs, a chelating agent, a food additive, etc. The process produces an aminocarboxylic acid salt from an aminoalcohol by subjecting the aminoalcohol to an oxidative dehydrogenation reaction in the coexistence of an alkali metal hydroxide and/or an alkaline earth metal hydroxide, a copper-containing catalyst and water, and is characterized by performing the reaction while maintaining the nickel concentration in the reaction mixture at 40 ppm or less.

Abstract: There is provided a novel process for producing aminocarboxylic acid salts useful as starting materials of agricultural chemicals and medicines, chelating agents, food additives, and so on. This process is characterized in that when producing an aminocarboxylic acid salt by an oxidative dehydrogenation reaction of an amino alcohol in the presence of an alkali metal hydroxide and/or an alkaline earth metal hydroxide, a copper-containing catalyst and water, the reaction is performed by adding an aluminum metal and/or an aluminum compound (e.g., sodium aluminate and aluminum hydroxide) to the reaction system.

Abstract: A method for the production of a 1,3-dioxolane represented by the general formula III: ##STR1## wherein R.sup.1 is hydrogen atom or an alkyl group of 1 to 5 carbon atoms and R.sup.2 is hydrogen atom or an alkyl group of 1 to 2 carbon atoms or a phenyl group, which method comprises reacting an aldehyde represented by the general formula I ##STR2## wherein R.sup.1 has the same meaning as defined above, with an alkylene oxide represented by the general formul II: ##STR3## wherein R.sup.2 has the same meaning as defined above, in an alkylene glycol solvent corresponding to said alkylene oxide in the presence of at least one catalyst selected from the group consisting of bromides of alkali metals, iodides of alkali metals, bromides of alkaline earth metals, and iodides of alkaline earth metals.

Abstract: A flotation collector is formed on a copolymer comprising (A) 2 to 95 mol % of a structural unit represented by the general formula I: ##STR1## wherein R.sup.1 is H or methyl, Y is --O-- or --NH--, A is C.sub.1-4 alkylene, C.sub.2-4 hydroxyalkylene, or phenylene, and Z is ##STR2## wherein R.sup.2, R.sup.3, and R.sup.4 are independently H, C.sub.1-12 alkyl or C.sub.7-10 aralkyl and X.sup..crclbar. is anion pair, (B) 5 to 98 mol % of a structural unit represented by the general formula II: ##STR3## wherein R.sup.5 is H or methyl and W is C.sub.6-8 aryl, ##STR4## wherein n is 2 to 4 and m is 0 to 20, ##STR5## wherein R.sup.6 is C.sub.1-18 alkyl, C.sub.5-8 cycloalkyl, C.sub.7-10 aralkyl, or C.sub.6-18 aryl, and (C) 0 to 50 mol % of other structural unit. A method for the treatment of an inorganic substance-containing water system by the use of the flotation collector.

Abstract: The present invention discloses an acid gas absorbent composition, comprising a diethylene glycol dialkyl ether represented by the general formula I:R.sup.1 O(C.sub.2 H.sub.4 O).sub.2 R.sup.2 (I)wherein R.sup.1 and R.sup.2 are independently an alkyl group of 1 to 4 carbon atoms, and a polyethylene glycol dialkyl ether represented by the general formula II:R.sup.3 O(C.sub.2 H.sub.4 O).sub.n R.sup.4 (II)wherein R.sup.3 and R.sup.4 are independently an alkyl group of 1 to 4 carbon atoms and n is an integer in the range of 3 to 8.