Toray Industries, Inc.

Fuji Oil Company Limited

Takehisa Inoue

Kishio Miwa

Kazuyoshi Iwayama

Kuniyuki Tada

Yukiko Nagaoka

Kazuo Tsunoi

Atsushi Ebitani

Takao Kamano

Eiichi Minomiya

Tsuneyuki Kondo

Masaki Fujii

Makoto Kihara

Hiromi Shiomi

Atsuo Kani

Kimio Sato

Norio Hayakawa

Kazuyuki Sakaya

A specific isomer of a trisubstituted benzene is continuously separated from a mixture containing at least two isomers of the trisubstituted benzene by adsorptive separation using a simulated moving bed, wherein a faujasite type zeolite adsorbent is used as the adsorpent and the specific isomer is separated as the extract component in the presence of a substituted benzene compound. The specific isomer to be separated is, for example, 2,6-dichlorotoluene, 3,5-dichlorotoluene and 2-chloro-m-xylene. The substituted benzene compound is preferably a compound represented by the formula: ##STR1## wherein R.sup.1 is H or CH.sub.3, R.sup.2 is H, CH.sub.3 or Cl and R.sup.3 is CH.sub.3 or Cl, with the proviso that the case where R.sup.1 is CH.sub.3, R.sup.2 is Cl and R.sup.3 is Cl is excluded.

Adsorptive separation process

Iodine and iodine compounds are removed by using an adsorbent comprising a silver loaded pentasil zeolite.

Adsorbent for and method of removing iodine compounds

The present invention relates to a rotary valve for distributing a fluid in various directions and collecting fluids from various directions. The rotary valve consists of two stator disks having passages that constitute a part of complete passages through which the fluid runs, and a rotor disposed between the two stator disks and having passages which communicate with selected at least two of the passages in the stator disks to form complete passages through which the fluid runs. Each time the rotor is turned intermittently, different passages are formed through which the fluid runs.

Absorption apparatus including rotary valve

A substituted benzene isomer mixture containing a meta-substituted benzene or 1,3,5-substituted benzene is contacted with an adsorbent of a faujasite type zeolite containing a Ag cation and/or a Cu cation, whereby the meta-substituted benzene or 1,3,5-substituted benzene is separated and recovered as a raffinate component.

Process for separation of substituted benzene isomers

Provided is a process for separating a halogenated toluene isomer from a feed containing a mixture of halogenated toluene isomers by adsorptive separation techniques using a Y type zeolite as an adsorbent and an alkyl aromatic hydrocarbon, 3,4-dihalotoluene or 4-haloorthoxylene as a desorbent.

Process for separating a halogenated toluene isomer

A crystalline aluminosilicate zeolite is obtained by stirring under heating an aqueous reaction mixture containing a silica source, an alumina source, an alkali source and an organic carboxylic acid.

Process for preparing crystalline aluminosilicate zeolites using a

A process for improving the fluidity of hydrocarbon fractions by dewaxing thereof. In the present process, hydrocarbon fractions are contacted with hydrogen in the presence of a specific type of catalyst, thereby lowering the pour point of the hydrocarbon fraction. The catalyst comprises a specific type of zeolite which is defined by a specific X-ray diffraction pattern and which has a predetermined range of mesitylene adsorption of not less than 1.6 wt %. The zeolite catalyst is obtained by providing an aqueous reaction mixture of SiO.sub.2, Al.sub.2 O.sub.3, an alkaline source as OH.sup.-, and a carboxyl group-containing organic compound having the following composition:

Process for the dewaxing of hydrocarbon fractions

Pressure swing selective adsorption-desorption process for separating at least one gaseous component from a gas mixture. In the adsorption step, a starting gas mixture is introduced at a pressure lower than that of a purge gas and, after completion of the adsorption step, at least a portion of the effluent gas from an adsorption column under execution of a purge is introduced into the adsorption column which has just completed the adsorption step and is about to enter upon the purge step, thereby pressurizing the latter adsorption column.

Separation process for a gas mixture

A crystalline aluminosilicate zeolite is obtained by stirring under heating an aqueous reaction mixture containing a silica source, an alumina source, an alkali source and an organic carboxylic acid not containing an aromatic ring preferably having 3 to 6 carbon atoms and 1 to 3 carboxyl groups.

Xylenes containing ethylbenzene are contacted with a catalyst comprising an acid type mordenite and a specific acid type zeolite such as, for example, ZSM-5, ZSM-8 or ZSM-11, in vapor phase in the presence of hydrogen, whereby there are performed deethylation of ethylbenzene and isomerization of xylenes.

Conversion of xylenes containing ethylbenzene

A mixture of xylene isomers containing ethyl benzene is contacted with a catalyst comprising a mordenite type zeolite and rhenium or phosphorus in the presence of hydrogen to isomerize xylenes and at the same time dealkylate ethyl benzene into mainly benzene.

Conversion of xylenes containing ethyl benzene

Provided is a process for isomerizing a halogenated toluene using an acid form of zeolite as a catalyst.

Process for the isomerization of a halogenated toluene

A feed containing a mixture of at least two alkylphenol isomers is contacted with a zeolite adsorbent to allow an alkylphenol isomer in the mixture to be selectively adsorbed on the adsorbent, and then the adsorbent is contacted with an aliphatic ketone desorbent to desorb the adsorbed isomer.

Process for separating an alkylphenol isomer

In the separation of cyclohexene from a feed which contains cyclohexene and cyclohexane, the feed is contacted with a type X and/or type Y aluminosilicate zeolite, thereby adsorbing cyclohexene selectively on the zeolite, and then the zeolite which adsorbed cyclohexene is contacted with a trimethylbenzene to desorb cyclohexene.

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Tokyo, Japan

Takehisa Inoue