Nippon Shokubai Kagaku Kogyo Co., Ltd.

Yutaka Morimoto

Koichi Yamamoto

Masao Kitano

Tsunemasa Ueno

Seiichi Suzuki

Kazuo Kodama

Kazutomo Takahashi

Hideyuki Nishibayashi

Takashi Tazaki

Hideaki Tsuneki

Yuuji Shimasaki

Michio Ueshima

Minoru Saotome

Atsushi Komai

Mitsuaki Yagisawa

Teruo Kamei

Tsunehiko Soga

Kouichi Kojima

Jiro Uchii

Masatsugu Kodo

An amphoteric polyelectrolite represented by the general formula: ##STR1## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are H or alkyl, R.sup.5 is H, alkyl or w-OH substituted alkyl, HY is monobasic acid, and Z is amide.

Amphoteric polyelectrolyte, method for production thereof, and organic

An amphoteric polyelectrolite represented by the general formula: ##STR1## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are H or alkyl, R.sup.5 is H, alkyl or w--OH substituted alkyl, HY is monobasic acid, and Z is amide.

Amphoteric polyelectrolite, method for production thereof, and organic

A method for the production of a 1,3-thiazolidin-2-one represented by the general formula II: ##STR1## wherein R.sup.1, R.sup.2, R.sup.3, and R.sup.4 are independently hydrogen atom or a lower alkyl group, which method comprises causing a 1,3-thiazolidine represented by the general formula I: ##STR2## wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4 R.sup.5, and R.sup.6 are independently hydrogen atom or a lower alkyl group to react with urea.

Method for production of 1,3-thiazolidin-2-ones

Process for producing aziridines

4-Methyl-5-[(2-aminoethyl)-thiomethyl]-imidazole can be effectively produced by causing 4-methylimidazole or a salt thereof to react with at least one member selected from the group consisting of (a) a formaldehyde adduct of cysteamine, (b) 2-aminoethanethiol sulfuric acid and formaldehyde or a formaldehyde oligomer, and (c) thiazolidine or a salt thereof, in the presence of a mineral acid, removing a portion of reaction liquid out of the reaction system while maintaining molar concentration of 4-methyl-5-[(2-aminoethyl)-thiomethyl]-imidazole in the reaction system not exceeding 70 mol % based on total mol numbers of 4-methylimidazole and 4-methyl-5-[(2-aminoethyl)-thiomethyl]-imidazole, then separating a liquid containing 4-methyl-5-[(2-aminoethyl)-thiomethyl]-imidazole from the removed portion of reaction liquid, and recycling the remainder into the reaction system.

Method for production of 4-methyl-5-(2-aminoethyl)-thiomethyl)-imidazole

In a method for the production of a dithiodialdehyde represented by the formula II: ##STR1## wherein R.sup.1 and R.sup.2 are independently alkyl group of 1 to 8 carbon atoms, by condensation of an active hydrogen-containing aldehyde represented by the formula I: ##STR2## wherein R.sup.1 and R.sup.2 have the same meanings as defined above, with sulfur monochloride, the improvement which comprises simultaneously supplying said active hydrogen-containing aldehyde and sulfur monochloride to an inactive solvent, or adding said active hydrogen-containing aldehyde to a mixture of said inactive solvent with the sulfur monochloride.

Method for production of dithiodialdehyde

A method for the producing 2-[[[5-(dialkylamino)alkyl-2-furanyl]methyl]thio]-ethane amine by the reaction of cysteamine or cysteamine hydrochloride containing free hydrogen chloride with 5-(dialkyl amino)alkyl furfuryl alcohol, which method can be obtained the product in a highly yield by carrying out said reaction at a temperature in the range of 30.degree. to 80.degree. C.

Method for production of amine compound

A method for the production of an aqueous dispersion of a water insoluble N-substituted N',N'-alkylene urea having the general formula I: ##STR1## wherein R.sup.1 denotes alkyl having 6 to 20 carbon atoms, phenyl or ##STR2## in case of m=1, or R.sup.1 denotes alkylene having 6 to 20 carbon atoms, phenylene or ##STR3## in case of m=2, where X denotes H, CH.sub.3 or OCH.sub.3 and n is 0 or 1, R.sup.2 denotes H or CH.sub.3, R.sup.3 denotes H, CH.sub.3 or C.sub.2 H.sub.5 and R.sup.4 denotes H or CH.sub.3, by the reaction of an alkylene imine having 2 to 4 carbon atoms with an isocyanate represented by the general formula II:

Method for production of aqueous dispersion of N-substituted

A method of recovering ethylene oxide from the reaction product gas that is obtained by the catalytic vapor phase oxidation of ethylene with molecular oxygen over a silver-containing catalyst, which comprises conducting the reaction product gas to an absorption column maintained at a pressure in the range of 2 - 40 kg/cm.sup.2, countercurrently contacting reaction product gas with an aqueous absorbent in the absorption column to dissolve ethylene oxide in the aqueous absorbent to form an aqueous ethylene oxide solution, conducting the thus formed aqueous solution to a stripping column, stripping and recovering ethylene oxide from aqueous ethylene oxide solution at the stripping column, and thereafter recycling the remaining aqueous solution which is obtained after stripping ethylene oxide to the absorption column to be again used as the aqueous absorbent; characterized by using as the aqueous absorbent one containing ethylene glycol in the range of 0.1 - 40% by weight and a defoaming agent in the range of 0.5 - 1000 ppm and having a pH in the range of 3 - 12.

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Yokohama, Japan

Yutaka Morimoto