Toyo Soda Manufacturing Co., Ltd.

Tosoh Corporation

Keiji Itabashi

Junji Arika

Hiroshi Miyazaki

Masao Nakano

Kazushige Igawa

Yukio Ito

Hiroshi Ogawa

Satoru Morishita

Hisashi Hatotani

Takumi Kagawa

Fumio Okisaki

Nobuhiro Ogawa

Masashi Harada

Michiyuki Aimoto

Kenji Koyama

Kimitaka Kuma

Nobuhiro Fujita

Tetsuo Takaishi

Yoshio Tamura

A method for adsorbing and removing ethylene in an exhaust gas, comprises contacting with the gas an adsorbent comprising a zeolite which contains Ag and which has a ferrierite structure with a SiO,/Al,O,molar ratio being at least 15.

Method for adsorbing and removing ethylene and method for purifying an exhaust gas

A method for purifying an exhaust gas by contacting the exhaust gas with an exhaust gas-purifying catalyst comprising a nitrogen oxide-removing catalyst and an adsorbent for ethylene comprising a zeolite which contains Ag, and also Pd, optionally which has a ferrierite structure.

Adsorbent for ethylene, method for adsorbing and removing ethylene and

An adsorbent for ethylene, comprising a zeolite which contains Ag and which has a ferrierite structure with a SiO.sub.2 /Al.sub.2 O.sub.3 molar ratio being at least 15.

The subject of the invention is to provide a new high-performance flame retardant having excellent flame resistant effect and smoke-suppressing effect and generating no hazardous gas, and a new flame retardant resin-composition used it. As a means for solution, a flame retardant comprising ethylenediamine-containing zinc phosphate and other phosphorus-containing compound is formulated in amounts of 10 to 200 parts by weight to 100 parts by weight of resin.

Flame retardant and flame retardant resin composition formulated with

A crystalline zeolite X adsorbent comprising a crystalline zeolite X having an SiO.sub.2 /A.sub.2 O.sub.3 molar ratio of not larger than 3.0, where lithium cations associated with an AlO.sub.2 tetrahedron unit are 80 to less than 88 mol % of the total cations and the content of alkaline earth metal cations is from 0.5 to less than 4.6 mo % is produced by ion-exchanging with lithium cations at least 90 mol % of the cations associated with an Al.sub.2 O.sub.3 tetrahedron unit of a crystalline zeolite X having an SiO.sub.2 /Al.sub.2 O.sub.3 molar ratio of not larger than 3.0, ion-exchanging the crystalline zeolite X again with an aqueous solution of mixed salts of an alkali metal salt and an alkaline earth metal salt to decrease the lithium cations associated with the AlO.sub.2 tetrahedron unit to 80 to less than 88 mol %, followed by washing and drying, and activating the crystalline zeolite X. The crystalline zeolite X adsorbent is used for the recovery of oxygen from air by a pressure swing adsorption method by using the crystalline zeolite adsorbent.

Adsorbent for air separation, production method thereof, and

A synthetic mordenite molded body is prepared by a process wherein a starting mixture comprising, as the main components, a silica source, an alumina source, an alkali source and water is molded into a starting molded body, the molded body is calcined and the calcined molded body is heated in an aqueous solution of sodium silicate. The starting mixture has incorporated therein a mordenite seed crystal powder. When the molded body is calcined, the temperature is elevated by heating to a calcination temperature not lower than 400.degree. C. at an average rate of at least 10.degree. C./min and calcination is conducted at the calcination temperature within a time period of 2 hours. When the calcined molded body is crystallized, an aqueous solution of sodium silicate having an SiO.sub.2 concentration of 7 to 25% by weight, an Na.sub.2 O concentration of 2 to 8% by weight and an SiO.sub.2 /Na.sub.2 O molar ratio of from 0.9 to 4.0 is used as the aqueous solution of sodium silicate.

Process for preparation of synthetic mordenite molded body

Disclosed is a zeolite having a composition of the following formula: xM.sub.2/n O.Al.sub.2 O.sub.3.(5-10)SiO.sub.2.yH.sub.2 O wherein M is at least one cation having a valency of n, and x is 0.8-2 and y is 0-10, and exhibiting an X-ray powder diffraction pattern shown in Table 1. This zeolite is prepared by a process wherein a reaction mixture comprising a silica source, an alumina source, an alkali source, a potassium source and water and having a composition satisfying the following molar ratios: SiO.sub.2 /Al.sub.2 O.sub.3 =6-40, OH/SiO.sub.2 =0.3-1, K.sub.2 O/M.sub.2 O=0.1-0.9 (M: the total of alkali metals), and H.sub.2 O/SiO.sub.2 =10-70, is crystallized at 120.degree. to 200.degree. C. with stirring. The zeolite is also prepared by a process wherein a granular amorphous aluminosilicate containing aluminum in an amount of 4 to 22 wt. % as Al.sub.2 O.sub.3 (on the anhydrous base), which is obtained by reacting an aqueous alkali metal silicate solution with an aqueous aluminum-containing solution, is incorporated in an aqueous alkali metal hydroxide solution and/or an aqueous alkali metal silicate solution, to form a mixture having a composition defined by the above-mentioned molar ratios, and the mixture is crystallized with stirring.

Process for preparation of zeolite OE having an offretite type structure

A mordenite type zeolite having a high purity and a high SiO.sub.2 /Al.sub.2 O.sub.3 molar ratio is prepared without using an organic or inorganic mineralizer, by a process wherein a homogeneous aluminosilicate containing 3 to 14% by weight, expressed in terms of Al.sub.2 O.sub.3 (calculated as the anhydride), of aluminum is crystallized in an aqueous solution of an alkali metal hydroxide.

Process for preparation of mordenite type zeolite

A ferrierite type zeolite having a high purity and a high SiO.sub.2 /Al.sub.2 O.sub.3 molar ratio is prepared by reacting simultaneously and continuously an aqueous sodium and/or potassium silicate solution with an aluminum-containing solution to obtain a homogeneous phase compound of a granular amorphous aluminosilicate containing Al in an amount of 3 to 14 wt. % as calculated as anhydrous Al.sub.2 O.sub.3 and Na and/or K in an amount of 1 to 17 wt. % as calculated as anhydrous Na.sub.2 O and/or K.sub.2 O; and then, crystallizing the homogeneous phase compound in the form of a slurry in water or in an aqueous sodium hydroxide and/or potassium hydroxide solution. The molar ratio of K.sup.+ to the total of (K.sup.+ +Na.sup.+) in the slurry is 0.1 to 0.9.

Process for preparation of ferrierite type zeolites

A zeolite similar to ZSM-5, having lattice spacings (d-values), shown in Table 1, of the X-ray powder diffraction pattern, and a ferrierite zeolite are prepared by crystallizing a homogeneous phase compound of a granular amorphous aluminosilicate in water or in an aqueous solution of an alkali metal hydroxide and/or an alkali metal silicate.

Process for preparation of zeolites

An L type zeolite of a high purity is prepared by crystallizing an amorphous sodium alminosilicate compound containing a silicon component in an amount of 67 to 91 wt. % as SiO.sub.2 on the anhydrous basis in an aqueous potassium hydroxide solution.

Process for preparation of L type zeolites

A zeolite encapsulating material composed of an A-type zeolite expressed by a typical unit cell (CsxMII.sub.y Naz)(AlO.sub.2.SiO.sub.2).sub.12 .multidot.(NaAlO.sub.2).delta..multidot..omega.H.sub.2 O wherein MII represents a divalent metal; O.ltoreq..delta..ltoreq.1; and .omega. represents a positive number. Further, in the above stated unit cell, x, y and z which respectively represent the numbers of Cs, M and Na within the unit cell are in a relation:

Zeolite encapsulating material

A zeolite occluding material composed of an A-type zeolite expressed by a generic formula (Kx My Naz)(AlO.sub.2.SiO.sub.2).sub.12.(NaAlO.sub.2).delta...omega.H.sub.2 O wherein M represents a bivalent metal; O.ltoreq..delta..ltoreq.1; and .omega. represents a positive number. Further, in the above stated unit cell, x, y and z which respectively represent the numbers of K, M and Na within the unit crystal lattice (or unit crystal cell) are in a relation:

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Shinnanyo, Japan

Keiji Itabashi