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Isolation of m-xylene from C8 arenes
Patent report
Catalyst for purifying exhaust gas K. Shiokawa; T. Itoh
on hydrophobic molecular sieves such as dealuminated zeolites with Si/AI ratio >10 and pore diameter 0.4-1.5 nm.
N.E, Chemcat Corp. Eur. Pat. Appl. 598,178, May 25, 1994; Jpn. Appl. Nov. 16, 1992 A catalyst for purifying exhaust gas includes a zeolite carrier having a molar ratio of SIO2/AI203 of 20-200 and a compound oxide of copper and silicon supported on the carrier. The catalyst has high activity for elimination of nitrogen oxides (NO×) even in the presence of both oxygen and water vapor and also has excellent durability at high temperatures.
SEPARATION PROCESSES
Separation of 2,6-dimethylnaphthalene from other dimethylnaphthalene isomers S. Takano; K. Sawai; T. Fujisawa
Petroleum Energy Center Foundation Jpn. Kokai Tokkyo Koho 94,65,114, Mar. 8, 1994; Appl. Aug. 21, 1992 In the selective separation of 2,6-dimethylnaphthalene (I) from a mixture of dimethylnaphthalene isomers, a cation-exchanged Y zeolite is used as the adsorbent, and m-xylene is used as the solvent. The method gives highly pure I.
isolation of m-xylene from Cs arenes M. Shimura; K. Shimokawa; Y. Shirato
Chiyoda Chem, Eng. Construction Co. Jpn. Kokai Tokkyo Koho 94,09,438, Jan. 18, 1994; Appl. June 20, 1992 m-Xylene (I) is isolated from I-containing C8 arene mixtures by selective adsorption of I by treating the mixtures with Nacontaining Y zeolite adsorbents with ~>5 silica/alumina molar ratio including >/145 °C b.p. alkylarenes followed by desorption of I with desorption agents.
Separation of 2,6-dimethylnaphthalene from a mixture of dimethylnaphthalene isomers K. Yamamoto; Y. Mifuji
Kobe Steel Ltd. Jpn. Kokai Tokkyo Koho 94,65,113, Mar. 8, 1994; Appl. Aug. 17, 1992 The separation method involves (1) an extraction process using supercritical carbon dioxide; (2) an adsorption process using zeolite Y for selective adsorption of 2.7-dimethylnaphthalene.
Adsorptive separation of cresol isomers H.A. Zinnen
Separation of hydrocarbon mixtures
UOP Inc. Eur. Pat. Appl. 587,949, Mar. 23, 1994; Appl. Sept. 16, 1992
R. Ramachandran; L. Dao BOC Group Inc.
p- and m-Cresol are coextracted from a feed mixture comprising all three isomers and at least one other alkylphenol with an adsorbent containing at least 5 wt % water (LOI) and including an X-zeolite exchanged with Ba ions or with a mixture of Ba and K ions so that both p- and m-cresol are selectively adsorbed. The resulting adsorbent is contacted with a desorbent comprising an aliphatic alcohol whereby an extracted stream enriched in pand m-isomer is produced. The adsorption and desorption is carried out at 20-250 °C and under pressure to maintain liquid phase.
A gaseous alkene is separated from a gaseous alkane by pressure-swing adsorption alone or in combination with distillation wherein the alkene is preferentially adsorbed onto a bed of 4A zeolite at a temperature of at least about 50 °C and preferably in the range of 50-200 °C. Typically, the alkane is propane and the alkene is propylene; alternatively, the alkane may be ethane and the alkene ethylene.
Eur. Pat. Appl. 572,239, Dec. 1, 1993; U.S. Appl. May 29, 1992
Removing hydrocarbons from gaseous mixtures Process for removing carbon monoxide from carbon monoxide-containing air and nitrogen
W. Hertl; I.M. Lachman
R. Jain
Can. Pat. Appl. 2,094,763, Feb. 6, 1994; U.S. App[. Aug, 5, 1992
BOC Group Inc.
Hydrocarbons are removed from a gaseous mixture that includes water and hydrocarbons by contacting the mixture with a first stage comprising hydrophilic material (e.g., type A, L, or X zeolites, chabazite, erionite, clinoptilolite, ferrierite, phillipsite, mazzite, offretite, aluminophosphates, and silicoaluminophosphates) to remove at least some of the water and produce a drier mixture and thereafter contacting the drier mixture with a second stage including an agent for removing hydrocarbons (e.g., ~- one molecular sieves such as zeolites, carbon, metallophosphates, aluminophosphates, and silicoaluminophosphates), to produce a purified mixture.
Eur. Pat. Appl. 590,946, Apr. 6, 1994; U.S. Appl. Oct. 1, 1992 The process involves passing a stream of ~<100 volume ppm CO-containing air or N through a bed of CO-selective adsorbent at a temperature <150 K. The adsorbent is a Ca-exchanged zeolite X, zeolite 5A, or zeolite 13X. The adsorbent is regenerated by heat treatment.
Separation of oxygen from argon/oxygen mixture A.I. Kandybin; R.A. Anderson; D.L. Reichley
Arbor Research Corp.
Coming Inc.
PCT Int. Appl. 94,06,541, Mar. 31, 1994; U.S. Appl, Sept. 22, 1992 Ar is removed from a feed O-Ar stream to yield a high purity O stream by passing the feed gas at - 3 0 to 100 °C and 5-160 psia over an adsorbent bed of an Ag ion-exchanged X zeolite, where >~60% of the available ion sites are occupied by Ag such that at least a portion of the Ar in the feed gas is adsorbed by the adsorbent bed, leaving an O-enriched gas stream.
Adsorption of halogenated hydrocarbons from moist air H. Stach; E. Otto; U. Gross et al.
AUF Ad/ershofer Umweltschutztechnik- und Forschungsgese//schaft mbH Ger. Often. 4,233,577, Apr. 7, 1994; Appl. Oct. 1, 1992 Halogenated hydrocarbons, such as R 11, R 12, and R 13, are removed from moist gases such as industrial air by adsorption
384
Z e o l i t e s 15:382-386, 1995
DETERGENTS Stable aqueous zeolite suspensions J.B. Egraz; H. Grondin; J.M. Suau
Coatex S,A. Eur. Pat. Appl. 577,525, Jan. 5, 1994; Fr. Appl. July 1, 1992 Copolymers prepared from/> one acrylic monomer containing a carboxy group, ~ one acrylic and/or vinyl monomer containing no carboxy groups, and/> one ethylenically unsaturated monomer containing a polyoxyethylene group and a hydrophobic fatty C12-4o chain are used as dispersing agents in the preparation of stable aqueous suspensions of zeolites. The suspensions are useful in the preparation of detergent compositions.
Catalyst for purifying exhaust gas K. Shiokawa; T. Itoh
on hydrophobic molecular sieves such as dealuminated zeolites with Si/AI ratio >10 and pore diameter 0.4-1.5 nm.
N.E, Chemcat Corp. Eur. Pat. Appl. 598,178, May 25, 1994; Jpn. Appl. Nov. 16, 1992 A catalyst for purifying exhaust gas includes a zeolite carrier having a molar ratio of SIO2/AI203 of 20-200 and a compound oxide of copper and silicon supported on the carrier. The catalyst has high activity for elimination of nitrogen oxides (NO×) even in the presence of both oxygen and water vapor and also has excellent durability at high temperatures.
SEPARATION PROCESSES
Separation of 2,6-dimethylnaphthalene from other dimethylnaphthalene isomers S. Takano; K. Sawai; T. Fujisawa
Petroleum Energy Center Foundation Jpn. Kokai Tokkyo Koho 94,65,114, Mar. 8, 1994; Appl. Aug. 21, 1992 In the selective separation of 2,6-dimethylnaphthalene (I) from a mixture of dimethylnaphthalene isomers, a cation-exchanged Y zeolite is used as the adsorbent, and m-xylene is used as the solvent. The method gives highly pure I.
isolation of m-xylene from Cs arenes M. Shimura; K. Shimokawa; Y. Shirato
Chiyoda Chem, Eng. Construction Co. Jpn. Kokai Tokkyo Koho 94,09,438, Jan. 18, 1994; Appl. June 20, 1992 m-Xylene (I) is isolated from I-containing C8 arene mixtures by selective adsorption of I by treating the mixtures with Nacontaining Y zeolite adsorbents with ~>5 silica/alumina molar ratio including >/145 °C b.p. alkylarenes followed by desorption of I with desorption agents.
Separation of 2,6-dimethylnaphthalene from a mixture of dimethylnaphthalene isomers K. Yamamoto; Y. Mifuji
Kobe Steel Ltd. Jpn. Kokai Tokkyo Koho 94,65,113, Mar. 8, 1994; Appl. Aug. 17, 1992 The separation method involves (1) an extraction process using supercritical carbon dioxide; (2) an adsorption process using zeolite Y for selective adsorption of 2.7-dimethylnaphthalene.
Adsorptive separation of cresol isomers H.A. Zinnen
Separation of hydrocarbon mixtures
UOP Inc. Eur. Pat. Appl. 587,949, Mar. 23, 1994; Appl. Sept. 16, 1992
R. Ramachandran; L. Dao BOC Group Inc.
p- and m-Cresol are coextracted from a feed mixture comprising all three isomers and at least one other alkylphenol with an adsorbent containing at least 5 wt % water (LOI) and including an X-zeolite exchanged with Ba ions or with a mixture of Ba and K ions so that both p- and m-cresol are selectively adsorbed. The resulting adsorbent is contacted with a desorbent comprising an aliphatic alcohol whereby an extracted stream enriched in pand m-isomer is produced. The adsorption and desorption is carried out at 20-250 °C and under pressure to maintain liquid phase.
A gaseous alkene is separated from a gaseous alkane by pressure-swing adsorption alone or in combination with distillation wherein the alkene is preferentially adsorbed onto a bed of 4A zeolite at a temperature of at least about 50 °C and preferably in the range of 50-200 °C. Typically, the alkane is propane and the alkene is propylene; alternatively, the alkane may be ethane and the alkene ethylene.
Eur. Pat. Appl. 572,239, Dec. 1, 1993; U.S. Appl. May 29, 1992
Removing hydrocarbons from gaseous mixtures Process for removing carbon monoxide from carbon monoxide-containing air and nitrogen
W. Hertl; I.M. Lachman
R. Jain
Can. Pat. Appl. 2,094,763, Feb. 6, 1994; U.S. App[. Aug, 5, 1992
BOC Group Inc.
Hydrocarbons are removed from a gaseous mixture that includes water and hydrocarbons by contacting the mixture with a first stage comprising hydrophilic material (e.g., type A, L, or X zeolites, chabazite, erionite, clinoptilolite, ferrierite, phillipsite, mazzite, offretite, aluminophosphates, and silicoaluminophosphates) to remove at least some of the water and produce a drier mixture and thereafter contacting the drier mixture with a second stage including an agent for removing hydrocarbons (e.g., ~- one molecular sieves such as zeolites, carbon, metallophosphates, aluminophosphates, and silicoaluminophosphates), to produce a purified mixture.
Eur. Pat. Appl. 590,946, Apr. 6, 1994; U.S. Appl. Oct. 1, 1992 The process involves passing a stream of ~<100 volume ppm CO-containing air or N through a bed of CO-selective adsorbent at a temperature <150 K. The adsorbent is a Ca-exchanged zeolite X, zeolite 5A, or zeolite 13X. The adsorbent is regenerated by heat treatment.
Separation of oxygen from argon/oxygen mixture A.I. Kandybin; R.A. Anderson; D.L. Reichley
Arbor Research Corp.
Coming Inc.
PCT Int. Appl. 94,06,541, Mar. 31, 1994; U.S. Appl, Sept. 22, 1992 Ar is removed from a feed O-Ar stream to yield a high purity O stream by passing the feed gas at - 3 0 to 100 °C and 5-160 psia over an adsorbent bed of an Ag ion-exchanged X zeolite, where >~60% of the available ion sites are occupied by Ag such that at least a portion of the Ar in the feed gas is adsorbed by the adsorbent bed, leaving an O-enriched gas stream.
Adsorption of halogenated hydrocarbons from moist air H. Stach; E. Otto; U. Gross et al.
AUF Ad/ershofer Umweltschutztechnik- und Forschungsgese//schaft mbH Ger. Often. 4,233,577, Apr. 7, 1994; Appl. Oct. 1, 1992 Halogenated hydrocarbons, such as R 11, R 12, and R 13, are removed from moist gases such as industrial air by adsorption
384
Z e o l i t e s 15:382-386, 1995
DETERGENTS Stable aqueous zeolite suspensions J.B. Egraz; H. Grondin; J.M. Suau
Coatex S,A. Eur. Pat. Appl. 577,525, Jan. 5, 1994; Fr. Appl. July 1, 1992 Copolymers prepared from/> one acrylic monomer containing a carboxy group, ~ one acrylic and/or vinyl monomer containing no carboxy groups, and/> one ethylenically unsaturated monomer containing a polyoxyethylene group and a hydrophobic fatty C12-4o chain are used as dispersing agents in the preparation of stable aqueous suspensions of zeolites. The suspensions are useful in the preparation of detergent compositions.