Abstract: 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.

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

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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:______________________________________ SiO.sub.2 /Al.sub.2 O.sub.3 20-60 H.sub.2 O/SiO.sub.2 5-100 OH.sup.- /SiO.sub.2 0.1-0.35 ______________________________________and reacting the mixture until crystals are produced. Advantageously, the ratio of the carboxyl group-containing organic compound to aluminum oxide is about 1.0 to 100.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: A pad clip for a disc brake is arranged to have friction pads which are carried by a support pushed against a disc with the lug parts which are formed at the ends of the friction pads engaged with stepped parts of the support. The pad clip is provided with hook parts which are arranged to engage the lug parts of the friction pad and, during brake application, to restrict the movement of the friction pad on the braking face of the disc.

Abstract: A novel optically active diamide derivative represented by the following general formula is provided, which is useful as a starting material for asymmetric synthesis of optically active compounds, ##STR1## wherein R.sup.1 is an acyclic or cyclic, divalent atomic group containing at least one carbon atom which will, upon substitution of one of the heterocyclic groups in the formula with a nucleophilic reagent, stand as an asymmetric center in the substitution product; R.sup.2 is a substituent which has such a configuration and a molecular size that the regioselectivity in the substitution reaction of the heterocyclic group with the nucleophilic reagent can be determined by a stereo-chemical interaction thereof with the substituent R.sup.1, the steric configuration of the two asymmetric carbon atoms to which the R.sup.2 substituents are attached being identical; X is a sulfur atom or an oxygen atom; and n is an integer which is 1 or 2.

Abstract: 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.

Abstract: A method of assembling or testing a large-load, marine working platform structure, comprising the steps of laying sand on the bottom surface of a dock, and placing on the layer of sand spud cans attached to the lower ends of support frames of the working platform structure so as to scatter a load applied to the dock bed.

Abstract: 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.

Abstract: A vertically movable, offshore working platform structure is disclosed, which includes a working platform vertically movably mounted on parallel arranged support frames individually comprising a plurality of parallel disposed vertically elongate cords connected altogether to a support frame assemblage by horizontal members and diagonal members having their ends secured to the cords at panel point portions of the cords, and which also includes guides for the vertical movement thereof which individually have a length at least great enough to extend between two longitudinally adjacent panel point portions of respective cords.

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

Abstract: 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.

Abstract: 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.

Abstract: An adsorbent for separating para-xylene from C.sub.8 aromatic hydrocarbons, specifically a faujasite zeolite which contains potassium, zirconium and proton or ammonium as cation, process for separating para-xylene, and process for making the adsorbent.