Abstract: To provide a process for recovering high quality hydrogen chloride rationally with good economical efficiency, particularly hydrogen chloride with an elevated quality level to be provided as the feedstock for the oxychlorination reaction in producing dichloroethane and a vinyl chloride monomer from a hydrogen chloride gas to be generated by the combustion of chlorine based waste. To use a process for recovering hydrogen chloride from chlorine based waste comprises adding water and a reducing agent to an acid gas obtained by the combustion of chlorine based waste to effect reaction to obtain a crude hydrogen chloride aqueous solution having an oxidation-reduction potential of not higher than 900 mV and then, distilling the crude hydrogen chloride aqueous solution to obtain a purified hydrogen chloride gas.

Abstract: To provide a process for recovering high quality hydrogen chloride rationally with good economical efficiency, particularly hydrogen chloride with an elevated quality level to be provided as the feedstock for the oxychlorination reaction in producing dichloroethane and a vinyl chloride monomer from a hydrogen chloride gas to be generated by the combustion of chlorine based waste. To use a process for recovering hydrogen chloride from chlorine based waste comprises adding water and a reducing agent to an acid gas obtained by the combustion of chlorine based waste to effect reaction to obtain a crude hydrogen chloride aqueous solution having an oxidation-reduction potential of not higher than 900 mV and then, distilling the crude hydrogen chloride aqueous solution to obtain a purified hydrogen chloride gas.

Abstract: An ion-exchanger is provided which comprises zirconium hydroxide supported on active carbon. The process for producing the ion-exchanger, and a process for removing a multiply charged anion are also provided which employ the ion-exchanger. The ion-exchanger of the present invention has high chemical resistance, high heat resistance, high mechanical strength, and excellent ion exchange characteristics.

Abstract: The invention provides a method of industrially producing high-quality polyethylenepolyamines, which exerts high decolorizing effect and is economical, comprising the steps that hydrogen halide is added to a mixture of polyethylenepolyamines and heated, then distillation is performed to fractionate components each having a boiling point not higher than that of triethylenetetramine, next alkali metal hydroxide is added to that residual liquor after distillation to neutralize, and distillation is performed again to fractionate components each having a boiling point not lower than that of tetraethylenepentamine.

Abstract: The invention relates to processes for removing chlorate salts from an aqueous alkali chloride solution employed in cation-exchange membrane electrolysis, comprising the steps of adding hydrochloric acid to an aqueous alkali chloride solution to form a reaction solution, and maintaining the absolute pressure of the reaction solution at a range not higher than 600 mmHg and not lower than the saturated vapor pressure of the solution in a decomposition vessel and/or feeding the reaction solution to the bottom portion of a decomposition vessel and causing the reaction solution to flow upward in the decomposition vessel.

Abstract: A method for treating an amine-containing waste water, which comprises conducting the waste water to active carbon.

Abstract: Ammonia and/or an alkyleneamine is reacted with an alkanolamine by using a miobium-containing substance as a catalyst to obtain an alkyleneamine having an increased number of alkylene units. The niobium-containing substance has a high activity and a high heat resistance, and is not or only slightly soluble in the water-containing reaction liquid.

Abstract: Process for producing polyamines by a catalytic reduction reaction of a cyanoethylated N-(2-aminoethyl)piperazine and cyanoethylated compounds of polyamines containing 4 or more amino groups in the molecule.

Abstract: An improved process for preparing a bis [.beta.-(N,N-dimethylamino)ethyl]ether by reacting a bismethohalide of bis [.beta.-(N,N-dimethylamino)ethyl]ether represented by the following general formula: ##STR1## (wherein X denotes a halogen atom), with an aliphatic amine having a boiling point of not lower than 220.degree. C. at atmospheric pressure and having a primary amino group in the molecule thereof. The process comprises the following two steps (a) and (b): (a) a step of distilling out water at a temperature of not more than 130.degree. C. under reduced pressure from a mixture of said bismethohalide aqueous solution and said aliphatic amine to provide a concentration of said bismethohalide to water of not less than 85% by weight, and (b) a step of reacting said bismethohalide and amine in a solid-liquid phase at a temperature of not lower than 140.degree. C.

Abstract: A method for preparing a bis[.beta.-(N,N-dimethylamino)alkyl]ether by reacting a bismethohalide of bis[.beta.-(N,N-dimethylamino)alkyl]ether represented by the following general formula ##STR1## (wherein R and R' denote alkyl groups having 2-3 carbon atoms, and X denotes halogen atom,) with the aliphatic amine having 40.degree.-170.degree. C. of boiling point at atmospheric pressure and having one or two primary amino group in a molecule thereof at an increased pressure.

Abstract: A method for preparing bis[.beta.-(N,N-dimethylamino)ethyl]ether characterized by performing a one stage reaction at a temperature of below 100.degree. C. wherein vapor of sulfuric anhydride is being introduced into a mixed solution consisting of sodium N,N-dimethylaminoethoxide, N,N-dimethylethanolamine and dioxane.

Abstract: A reaction in a catalyst suspension system is carried out by using a reactor equipped with a filter for separating the catalyst in the reactor.

Abstract: An organic peroxide is hydrogenated to produce the corresponding mono- or polyhydric alcohol in a suspensoid process or a fluidized bed process in the presence of more than 3 wt. % of a nickel catalyst at a reaction temperature of 140.degree. to 200.degree. C under a hydrogen pressure of 10 to 300 Kg/cm.sup.2 by feeding the organic peroxide at a rate of 0.05 to 10 g/hr. per 1 g of the nickel catalyst.