Mitsubishi Gas Chemical Company, Inc.

Junichiro Sugano

Tomoyuki Yui

Tsuneo Fujimoto

Yoshitugu Minamikawa

Minoru Kakuda

Yasuhisa Kuriyama

Minoru Kubota

Yukio Ishiuchi

Tadashi Yoshii

Tokuzo Tsuiki

Shuichi Kobayashi

Hiroshi Shin

Kichiro Iwamoto

Provided is a new granulator for preparing granules from a powdery material by agglomerating it through a kneading action, comprising a receptacle and two screws having screw blades disposed within the receptacle in parallel alignment to ensure intermeshing of the screw blades. The novel granulator consists of a feeding zone, a kneading zone divided into an upstream section and a downstream section, and a breaking zone. In the feeding zone, the blades on the two screws are forwardly conveying blades. In the upstream section of the kneading zone, on one screw a backwardly conveying blade is first provided and a forwardly conveying blade follows, and on the other screw, a forwardly conveying blade comes first and a backwardly conveying blade follows, said alternate arrangement occurring at least once in each screw. In the downstream section of the kneading zone, the blades on both of the screws are backwardly conveying screws. In the breaking zone, a plurality of small projections are provided on the peripheral surfaces of the screw shafts. The material transferred to the kneading zone from the feeding zone gradually advances while repeating a forward movement and a backward movement in an 8-figured pattern whereby it is agglomerated. The agglomerates are then broken by the projection in the breaking zone into granules of a suitable size.

Apparatus for granulating sodium percarbonate

A process for producing sodium percarbonate which comprises reacting sodium carbonate with hydrogen peroxide in a working solution of sodium carbonate, hydrogen peroxide and water, said reaction being carried out in the presence of at least one N,N,N',N'-tetra(phosphonomethyl)diaminoalkane of the following formula ##STR1## wherein R is either ##STR2## and n is 0 or 1 to 4, and at least one salt selected from the group consisting of phosphates, silicates and magnesium salts.

Process for producing sodium percarbonate

A process for producing sodium percarbonate which comprises reacting sodium carbonate with hydrogen peroxide in the presence of a stabilizer againsts the decomposition of hydrogen peroxide in a working solution of sodium carbonate, hydrogen peroxide and water, said stabilizer being at least one N,N,N',N'-tetra(phosphonomethyl)diaminoalkane of the following formula ##STR1## wherein R is either ##STR2## and n is 0 or 1 to 4.

A working solution comprising anthraquinone and its derivatives, used for the production of hydrogen peroxide on becoming degraded by formation of non-effective anthraquinone is generated by an auto-oxidation process employing anthraquinone, which comprises:

Method of regenerating a degraded working solution for the production of

A process for producing quinones corresponding to anthracenes or alkylnaphthalenes in high yields and selectivities, which comprises reacting the anthracenes or alkylnaphthalenes with hydrogen peroxide in the liquid phase in the presence of hydrogen chloride as a catalyst. Methanol, for example, may be used as a reaction medium.

Process for producing quinones

A method for promoting the bleaching action of a peroxy bleaching agent which comprises using as an activating agent for the bleaching agent at least one chloro-s-triazine derivative of the formula ##SPC1## Wherein A.sub.1 and A.sub.2 are substituents which are the same or different and each represents a chlorine atom or (1) --OR.sub.1 wherein R.sub.1 is an alkyl group containing not more than 12 carbon atoms or (2) ##EQU1## wherein R.sub.2 and R.sub.3 are the same or different and each represents a hydrogen atom or an alkyl group containing not more than 12 carbon atoms, with the proviso that A.sub.1 and A.sub.2 are not chlorine atoms at the same time.

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Yokkaichi, Japan

Junichiro Sugano