Sumitomo Chemical Company, Limited

Kabushiki Kaisha Kobe Seiko Sho

Masaaki Matsuda

Yushin Kataoka

Masahiro Aoi

Kenji Ochi

Masaru Kamoda

Yasuyuki Kato

Shingo Yoshida

Yuji Yoshida

Koji Yamamoto

Masahiro Motoyuki

Masao Minobe

Yasuhiko Inoue

Hiroshi Yoshitake

Hisako Nakashima

Yoshikazu Hirose

Midori Kumazawa

Kunitake Chino

Yoshirou Akiyoshi

Kouichi Ban

Yasumiti Namba

Yonezo Matsumoto

Yukihiro Sekine

In a method for separating at least one alkylnaphthalene from a stock mixture containing at least two alkylnaphthalenes selected from the group consisting of monoalkylnaphthalenes and dialkylnaphthalenes, a column packed with an optically active chromatographic packing is used for separation. The method can effectively separate a variety of alkylnaphthalenes from a mixture thereof.

Method for separating alkylnaphthalene

Finely dispersed metal-carrying compound whose metal has 50 .ANG. or less in size, which is useful as, for instance, catalysts and electrically conducting agents, is prepared by heating ion-exchange resin on which metal ion such as Pt ion is adsorbed, at 300.degree.-1500.degree. C. under an inert gas atmosphere, and, if desired, reducing.

Finely dispersed metal-carrying compounds and method for preparing the

A process for recovery of gallium from aqueous solution containing gallium by adsorbing gallium to a chelate resin is disclosed. According to this process, the aqueous solution containing gallium is contacted batchwise with a chelate resin having a high selective adsorptivity for gallium or by flowing the aqueous solution through the resin at a rate of at least 20 parts by volume/hr of the aqueous solution per 1 part by volume of the resin.

Process for recovery of gallium by chelate resin

Amino acid each is separated and refined by bringing aqueous solution containing various amino acids into contact with chelate resins having aminocarboxylic acid groups or aminophosphonic acid groups and having metal ions coordinated, until amino acids are absorbed on the resins, and then eluting the acids.

Process for refining amino acids

Chelating agents on which metals such as uranium have been adsorbed are brought into contact with an eluent of aqueous solution containing reducing agents and basic compounds, until the metals are eluted. The elution is effected with large speed without degradation of the chelating agents. Preferred chelating agents are rather stable under basic conditions but not under acidic conditions, for example, those having .dbd.NOH group in their molecules. The reducing agents and basic compounds in the eluent are, for example, sulfurous acid or salts thereof and sodium hydroxide, respectively.

Recovery of metals adsorbed on chelating agents

A method for eluting a metal adsorbed on a chelating agent with an eluent, which comprises using as the eluent an aqueous solution containing a water-soluble inorganic sulfide and a basic compound at concentrations of 0.005 to 3N and 0.1N or more, respectively.

Method for eluting a metal adsorbed on a chelating agent

A chelate resin having a functional group of the formula: ##STR1## wherein R.sub.1 and R.sub.2 are each independently hydrogen, alkyl, aminoalkyl, phenyl or a substituted group thereof and another functional group of the formula: ##STR2## wherein R.sub.3 is amino, alkylamino, polyethylenepolyamino, hydrazo, hydrazino, hydrazono, amidino, guanidino, semicarbazide or a substituted group thereof, has an excellent adsorption capacity for metal ions.

Process for producing a chelate resin

A process for eluting indium from a chelate resin having a phosphorus atom-containing, chelate-forming group which contains adsorbed indium, which comprises contacting said resin firstly with a primary eluent containing an acid containing no halogen atom in the molecule at a concentration of 0.1N or higher and then with an eluent for indium which is selected from the group consisting of (1) a solution of an acid containing a halogen atom in the molecule, (2) a mixed solution of (a) a metal halide, an ammonium halide or a mixture thereof and (b) an acid and (3) a mixed solution of a sulfide and a base compound.

Process for eluting indium from a chelate resin containing adsorbed

Chelate resin and process for producing the same

Gallium contained in a solution, especially a strongly basic aqueous solution can be effectively recovered by contacting the solution with a chelate resin having (A) .dbd.NOH group and (B) functional group capable of forming a chelate bond with said functional group (A) through gallium or a chelate resin having metal salt of said functional group to adsorb gallium to the resin.

Method for recovery of gallium

An aminophosphonic acid chelate resin, prepared by reacting an amino resin having amine-reactive groups (A) with an amino compound having one or more primary and/or secondary amino groups (B) to produce an aminated resin and subsequently reacting thus produced aminated resin with an alkylphosphonation agent (C), shows excellent adsorption ability of metal ions having low atomic weights such as calcium ions, magnesium ions, etc., when applied to a solution having high salt concentration.

Aminophosphonic acid chelate resin

A chelate resin produced by reacting (A) a resin having one or more primary and/or secondary amino groups in the molecule with (B) a polyfunctional compound having at least two reactive groups with amine and (C) an amino compound having one or more primary and/or secondary amino groups, or with a reaction product of said (B) polyfunctional compound and said (C) amino compound, shows excellent heavy metal collecting ability without being influenced by other coexisting ions.

Chelate resin prepared by aftertreatment of aminated resin with

A novel heavy metal-binding agent is obtained by reacting a resin containing in its molecular chain --NH--, --NH.sub.2, or both thereof with carbon disulfide and, if necessary, treating the reaction product thus obtained with a base. As compared with conventionally known metal-binding agents, the present metal-binding agent can remove heavy metals more effectively from solutions or gases containing these metals even in a range of extremely low concentrations, and, hence, is useful for pollution control.

Growing community of inventors

Niihama, Japan

Masaaki Matsuda