Kabushiki Kaisha Kobe Seiko Sho

Kobe Steel, Ltd.

Mobil Oil Corporation

Kabushiki Kaisha Kobe Seiko Sho (kobe Steel, Ltd.)

Shimadzu Corporation

Exxonmobil Chemical Patents Inc.

Mobile Oil Corporation

Koji Yamamoto

Masahiro Motoyuki

Ajit V Sapre

John P McWilliams

Shingo Yoshida

Susan Patricia Donnelly

John Paul Mc Williams

Takeharu Tanaka

Seiichi Yamamoto

Tomoki Uemura

Robert Glenn Bundens

Stuart Damon Hellring

Hiroshi Kawashima

Masahiro Ito

Hiroshi Maeda

Kazuhisa Fujisawa

Maki Hamaguchi

Masaaki Matsuda

Hitomi Ohara

Eiichiro Yoshikawa

Yoshikazu Seki

Seiji Sawa

Yoshiyuki Nagase

Yasuhiro Fujii

Kunihiko Shimizu

Noboru Nakao

Takeshi Kuri

Eiichi Kawada

Yasuko Yakou

Kenji Kawai

Hitoshi Sakuma

Yutaka Miyakawa

Masaaki Matsubara

Yonezo Matsumoto

Hisako Nakashima

Midori Kumazawa

Mika Anzai

The present invention relates to a process of preparingdialkylnaphthylenes and polyalkylenenaphthyleneatesdialkylnaphthalenes and polyalkylenenaphthalates.

Process for preparing 2,6-dialkylnaphthalene

A process for producing 2,6-dialkylnaphthalene from a hydrocarbon feedstock that contains at least one component selected from the group consisting of dialkylnaphthalene isomers, monoalkylnaphthalene isomers, polyalkylnaphthalenes, and naphthalene, is provided that includes the following steps:

Disclosed is a polyvinyl chloride recovering method for recovering polyvinyl chloride from waste including polyvinyl chloride by a continuous operation, and an system for carrying out the method, wherein the method comprises: an insoluble solid matter removing process of removing insoluble solid matters from a hot mixture of a solvent capable of dissolving polyvinyl chloride, and the waste; a solidifying process of solidifying polyvinyl chloride in water by bringing hot water into contact with a solution obtained by removing the insoluble solid matters from the hot mixture to remove the solvent; and a separating process of separating the solidified polyvinyl chloride from the water.

Method of recovering polyvinyl chloride and apparatus therefor

An object of the present invention is to provide a method for manufacturing 2,6-DMN, in which even when a mixture containing DMN isomers which includes 5 wt % or more of 2,7-DMN is used, a highly pure 2,6-DMN can be obtained. The method for manufacturing the highly pure 2,6-dimethylnaphthalene of the present invention comprises performing cooling crystallization of a mixture containing dimethylnaphthalenes which includes 2,6-dimethylnaphthalene, performing solid-liquid separation to obtain a solid component, and washing the solid component using a solvent, wherein the solid-liquid separation performed after the cooling crystallization includes press filtration. In the present invention, the pressure of the press filtration is preferably 10 kg/cmor more, and according to the method of the present invention, even when a DMN mixture containing 5 wt % or more of 2,7-DMN is used as a feedstock, a highly pure 2,6-DMN can be manufactured, and in addition, even when a DMN mixture containing less than 25 wt % of 2,6-DMN is processed by cooling crystallization, a highly pure 2,6-DMN can be manufactured.

Method for producing 2,6-dimethylnaphthalene

The invention provides an iron-based cleaning powder capable of efficiently decomposing organic halides. The iron-based cleaning powder is made of iron alloy powder or iron powder produced with an atomization process. The iron alloy powder passes a 300 &mgr;m-mesh sieve at a proportion of not less than 90% and has an H -reduction mass loss of 0.1 to 0.8% when it contains 0.3 to 1.1% of Mn. When the iron alloy powder contains 0.2 to 12% of Ni, it has an H -reduction mass loss of 0.1 to 1.0%. The iron powder is used as mixed powder or partially alloyed powder together with Ni-containing powder. The iron powder passes a 300 &mgr;m-mesh sieve at a proportion of not less than 90% and has an H -reduction mass loss of 0.1 to 1.0%. The Ni-containing powder has a Ni content of not less than 40% and passes a 45 &mgr;m-mesh sieve at a proportion of not less than 90%. The iron alloy powder and the iron powder have a martensite structure or a tempered martensite structure.

Iron-based cleaning powder

A method for purifying crude 2,6-naphthalenedicarboxylic acid includes a reduction step of reducing crude 2,6-naphthalenedicarboxylic acid containing 6-formyl-2-naphthoic acid with hydrogen and a cleaning step of cleaning the reduction product with alcohol. Preferably, in the reduction step, the crude 2,6-naphthalenedicarboxylic acid and the hydrogen is brought into contact with a hydrogenation catalyst in a liquid phase, and particularly in water. The method makes the purification process less complex and makes it possible to produce high-purity 2,6-naphthalenedicarboxylic acid without damaging equipment or increasing cost.

Method for purifying crude 2,6-naphthalenedicarboxylic acid

A high-purity naphthalenedicarboxylic acid is produced by a method including Steps &lsqb;1&rsqb; and &lsqb;2&rsqb;: In Step &lsqb;I&rsqb;, a raw mixture of crude terephthalic acid and crude naphthalenedicarboxylic acid is dissolved into high-temperature high-pressure water to form a dibasic acid solution wherein the crude naphthalenedicarboxylic acid content is 0.1 to 10 mass percent of the crude terephthalic acid content, the dibasic acid solution is brought into contact with hydrogen in the presence of a catalyst. In Step &lsqb;II&rsqb;, the resultant in the dibasic acid solution is crystallized by multiple stages while the temperature and the pressure are reduced for each stage, and acid mixtures containing enriched naphthalenedicarboxylic acid or enriched terephthalic acid are obtained by solid-liquid separation.

Method for making high-purity naphthalenedicarboxylic acid

A method for concentrating 2,6-dimethylnaphthalene in a dimethylnaphthalene isomer mixture includes supplying the dimethylnaphthalene isomer mixture to an adsorption column packed with Y-type zeolite. In this instance, by setting the value derived from the expression (u /&egr;)d at 14 (m s kg ) or more, the concentration ratio of 2,6-dimethylnaphthalene to 2,7-dimethylnaphthalene can be 2.0 or more. u here represents the linear velocity (m/s) of the dimethylnaphthalene isomer mixture supplied to an adsorption column, &egr; represents the packing density (kg/m ) of Y-type zeolite, and d represents the grain size (m) of the Y-type zeolite.

Method for concentrating 2,6-dimethylnaphthalene

The present invention provides a method for manufacturing a highly pure 2,6-dimethylnaphthalene having a purity of 99% or more even when a mixture of dimethylnaphthalene isomers containing 5 wt % or more of 2,7-dimethylnaphthalate is used as a feedstock. The method for manufacturing 2,6-dimethylnaphthalene comprises a step of performing crystallization and solid-liquid separation of a liquid primarily containing dimethylnaphthalene isomers so that the liquid is separated into a cake containing the dimethylnaphthalene isomers and a mother liquor, and a step of performing separation/purification of the cake. In the method described above, the crystallization and the solid-liquid separation are performed under the condition in which the ratio of the content of 2,6-dimethylnaphthalene in the mother liquor to that of 2,7-dimethylnaphthalene therein is not less than 1 so that the content of 2,6-dimethylnaphthalene in the cake is 60% or more and that the content of 2,7-dimethylnaphthalene therein is 6.5% or less. As a result, a highly pure 2,6-dimethylnaphthalene is obtained by performing the separation/purification of the cake.

Method for manufacturing 2,6-dimethylnaphthalene

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

The present invention relates to a method of preparing 2,6-dimethylnaphthalene from a feed stream that contains hydrocarbons which contain dimethylnaphthalene isomers. The method includes the following steps:

Isomerization of dimethylnaphthalene to produce 2,6-dimethylnaphthalene

The present invention relates to a process of preparing dialkylnaphthylenes and polyalkylenenaphthyleneates.

2,6-Dialkylnaphthalene is prepared from a feedstock comprising naphthalene and an alkylating agent, by a process comprising the steps: (I) transalkylating isomers of dialkylnaphthalene and naphthalene to produce monoalkylnaphthalene and isomers of dialkylnaphthalene; (II) separating the product obtained in step (I) into naphthalene, monoalkylnaphthalene, dialkylnaphthalene and other components; (III) alkylating the monoalkylnaphthalene fraction from step (II) with an alkylating agent to produce dialkylnaphthalene; and (IV) separating 2,6-dialkylnaphthalene from the dialkylnaphthalene fraction in step (II), wherein at least step (I) or step (III) is conducted in the presence of a catalyst having a composition comprising a synthetic zeolite having an X-ray diffraction pattern with an interplanar d-spacing (.ANG.)

Process for preparing dialkylnaphthalene

A method and system for producing poly(lactic acid) enable trapping and recovering of lactide vapor discharged from a reaction vessel without requiring a solvent or the like. In the method and system, lactide vapor is discharged from a polymerization reaction vessel in which poly(lactic acid) is produced by ring-opening polymerization, and trapped by solidification. The solidified lactide is liquefied by heat. Lactide can be recovered more easily and assuredly.

Method and system for producing poly (lactic acid)

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Kobe, Japan

Koji Yamamoto