Toa Nenryo Kogyo Kabushiki Kaisha

Asahi Kogaku Kogyo Kabushiki Kaisha

Toa Nenryo Kogyo, K. K.

Tao Nenryo Kogyo Kabushiki Kaisha

Tsugio Maeshima

Nobuaki Tagaya

Takao Hashimoto

Satoshi Sakurada

Noriko Komatsu

Keiko Fukamachi

Tetsuro Ogawa

Toshihiro Ishikawa

Hideyuki Kuwahara

Tadashi Miura

Eiichiroh Nishikawa

Masahiro Kokubo

Kayako Ueda

Takuji Itoh

Setsuo Kamiyama

Hideyuki Kuwakara

Mitsuko Nakamura

A calcium-phosphate type hydroxyapatite for chromatographic separation is in the form of spherulites having a mean particle diameter of 0.5 to 50 .mu.m, preferably 1 to 10 .mu.m. The spherulites are each an aggregate mainly of acicular crystallites belonging to a series of hexagonal systems and having unit lattice constants of 9.58.+-.0.08 .ANG. for the a axis and 7.00.+-.0.05 .ANG. for the c axis. The hydroxyapatite is produced by granulating a calcium=phosphate type hydroxyapatite in the form of a gel and then firing the granular apatite at 400.degree. to 700.degree. C., preferably at 500.degree. to 600.degree. C. The firing is performed by heating the granules in the presence of oxygen or air for a given period of time.

Calcium-phosphate type hydroxyapatite

The binderless zeolite of this invention is comprised more than 90% of crystalline aluminosilicate which is produced by crystalized a binder contained in extrudate obtained by molding a mixture of crystalline aluminosilicate and binder of silica-alumina. This binderless zeolite can improve it's catalytic activity without weaken the strength of the extrudate, since a so-called secondary pores also act as catalyst. Especially, when more than 50% of TSZ zeolite is contained, the catalytic ability of binderless zeolite is so excellent that it is preferably used as the catalyst for selective cracking of n-parafins of alkylation of aromatics using alkylation agents such as alcohols and olefins. Excellent binderless zeolite can be obtained by subjecting extrudate, formed by molding a mixture of about from 30 to 70% by weight of at least one member selected from crystalline aluminosilicate, silica alumina xerogel or hydrothermally treated silica alumina xerogel, and from 70 to 30% by weight of silica alumina gel containing from 2 to 10% by weight of alumina, under hydrothermal conditions.

Binderless zeolite catalysts, production thereof and catalytic reaction

A calcium-phosphate type hydroxyapatite for chromatographic separation is in the form of spherulites having a mean particle diameter of 0.5 to 50 .mu.m, preferably 1 to 10 .mu.m. The spherulites are each an aggregate mainly of acicular crystallites belonging to a series of hexagonal systems and having unit lattice constants of 9.58.+-.0.08 .ANG. for the a axis and 7.00.+-.0.05 .ANG. for the c axis. The hydroxyapatite is produced by granulating a calcium-phosphate type hydroxyapatite in the form of a gel and then firing the granular apatite at 400.degree. to 700.degree. C., preferably at 500.degree. to 600.degree. C. The firing is performed by heating the granules in the presence of oxygen or air for a given period of time.

Calcium-phosphate type hydroxyapatite for chromatographic separation and

The binderless zeolite of this invention is comprised more than 90% of crystalline aluminosilicate which is produced by crystalize a binder contained in extrudate obtained by molding a mixture of crystalline aluminosilicate and binder of silica-alumina. This binderless zeolite can improve it's catalytic activity without weaken the strength of the extrudate, since a so-called secondary pores also act as catalyst. Especially, when more than 50% of TSZ zeolite is contained, the catalytic ability of binderless zeolite is so excellent that it is preferably used as the catalyst for selective cracking of n-parafins or alkylation of aromatics using alkylation agents such as alcohols and olefins. Excellent binderless zeolite can be obtained by subjecting extrudate, formed by molding a mixture of about from 30 to 70% by weight of at least one member selected from crystalline aluminosilicate, silica alumina xerogel or hydrothermally treated silica alumina xerogel, and from 70 to 30% by weight of silica alumina gel containing from 2 to 10% by weight of alumina, under hydrothermal conditions.

A calcium-phosphate type hydroxyapatite which belongs to a series of hexagonal systems has unit lattice constants of 9.58.+-.0.08 .ANG. for the a axis and 7.00.+-.0.05 .ANG. for the c axis. Its Ca/P ratio is in the range of 1.50 to 1.90. It is for use as a column packing material for chromatographic separation of biopolymers. The hydroxyapatite is produced by firing it in the form of a gel or powder at a temperature of 400.degree. to 700.degree. C. As a gel the hydroxyapatite takes the form of a suspension or slurry. A powder is prepared by removing moisture from the hydroxyapatite in the gel form and then drying. Either gel or powder is fired by heating in the presence of oxygen or air at 500.degree. to 600.degree.0 C.

Calcium-phosphate type hydroxyapatite and process for producing same

1-Butene and isobutene are effectively separated without isomerization of 1-butene by contacting an isobutene-containing hydrocarbon mixture with a solid acid catalyst having a solid acid quantity of 0.05 to 0.25 mmol/g of solid acid catalyst, represented by the adsorption quantity of pyridine, thus low-polymerizing selectively isobutene and then separating the low polymers of isobutene from 1-butene.

Process for the low polymerization of isobutene

1-Butane and isobutene are effectively separated without isomerization of 1-butene by contacting an isobutene-containing hydrocarbon mixture with a solid acid catalyst having a solid acid quantity of 0.05 to 0.25 mmol/g of solid acid catalyst, represented by the adsorption quantity of pyridine, thus low-polymerizing selectively isobutene and then separating the low polymers of isobutene from 1-butene.

Nitrogen oxides are removed from gaseous mixtures comprising the same by contacting with a catalyst comprising a base metal component carried on a natural or synthetic zeolite in the presence of ammonia. The alkali metal content of the zeolite is carefully controlled through ion exchange with an alkaline earth metal compound.

Catalyst for reduction of nitrogen oxides and process for preparing same

Process for removing nitrogen oxides from gaseous mixtures comprising the same. Ammonia in an amount excessive over the stoichiometric amount necessary for reducing the nitrogen oxides is introduced into a reaction zone containing a catalyst. Then, ammonia in a minimum amount necessary for reduction of the nitrogen oxides is introduced into the reaction zone.

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Saitama, Japan

Tsugio Maeshima