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Molecular Sieve Patent

 

Lithium-aluminum-phosphorus-silicon-oxide molecular sieve compositions

Molecular sieve compositions having three-dimensional microporous framework structures of LiO.sub.2 AlO.sub.2 PO.sub.2 and SiO.sub.2 tetrahedral oxide units are disclosed. These molecular sieves have an empirical chemical composition on an anhydrous basis expressed by the formula: wherein "R" represents at least one organic templating agent present in the intracrystalline pore system; "m" represents the molar amount of "R" present per mole of (Li.sub.w Al.sub.x P.sub.y Si.sub.z)O.sub.2 ; and "w", "x", "y" and "z" represent the mole fractions of lithium, aluminum, phosphorus and silicon, respectively, present as tetrahedral oxides. Their use as adsorbents, catalysts, etc. is also disclosed.

Recovery of co-adsorbed hydrocarbons from molecular sieve adsorption units

In the purification of light hydrocarbons to remove carbonyl sulfide impurity by selective adsorption thereof on molecular sieve adsorbents, significant losses of the hydrocarbon are incurred by its coadsorption on the adsorbent with the COS impurity. Conventional desorption procedures produce a desorbate which is a non-commercial mixture of COS and hydrocarbon. The purge desorption method of the present invention utilizing a mixture of CO.sub.2 and a non-sorbable purge gas permits recovery of the coadsorbed hydrocarbon in a pure and commercially useful form.

In-line molecular sieve bed conversion kit

This invention relates to a method and apparatus for providing an in-line molecular sieve conversion kit for generating oxygen from the atmosphere which includes an elongated tube filled with separating material, pressurized air from the atmosphere introduced into the tube and conduits exiting from the tube carrying the oxygen to the point of use. An auxiliary spirally wound reservoir tube for storing pressurized atmospheric air to aid in the removal of nitrogen from the separating tube through a solenoid operated valve.

Ferrisilicate molecular sieve and use as a catalyst

Ferrisilicate molecular sieves of the ZSM-5 type, having SiO.sub.2 /Fe.sub.2 O.sub.3 mole ratios ranging from 20 to 400 are prepared by adding a silica source and a quaternary ammonium salt in that order to an acedified solution of an iron (III) compound, crystallizing the resulting gel to form a ferrisilicate molecular sieve, and thermally treating the molecular sieve with nitrogen, air and/or steam at 300.degree. to 700.degree. C. Preferred thermal treatment comprises treating with nitrogen first, then with air or steam. Thermally treated molecular sieves contain iron both in and outside the crystal framework; most of the non-framework iron is dispersed as very finely divided iron oxides on internal surfaces. Molecular sieves are useful as catalysts in Fischer-Tropsch and other iron oxide-catalyzied reactions.


Chabazite-containing molecular sieve, its synthesis and its use in the conversion of oxygenates to olefins
Synthesis of molecular sieve catalysts
Process for synthesis of high-silica silicate molecular sieve
Inorganic composite membrane comprising molecular sieve crystals
Lithium-aluminum-phosphorus-silicon-oxide molecular sieve compositions
Molecular sieve type gas separation systems
Molecular sieve layers and processes for their manufacture
Process for production of molecular sieve adsorbent blends
Molecular sieve compositions, catalyst thereof, their making and use in conversion processes

PAT. NO. Title
201 4973460 Lithium-aluminum-phosphorus-silicon-oxide molecular sieve compositions
202 4971682 Recovery of co-adsorbed hydrocarbons from molecular sieve adsorption units
203 4965989 In-line molecular sieve bed conversion kit
204 4952385 Ferrisilicate molecular sieve and use as a catalyst
205 4950421 Dewar cryopumping using molecular sieve
206 4940570 Beryllium-aluminum-phosphorus-oxide molecular sieve compositions
207 4938939 Preparation of small-pored crystalline titanium molecular sieve zeolites
208 4916630 Bed tester for molecular sieve oxygen concentrator
209 4913888 Arsenic-aluminum-phosphorus-oxide molecular sieve compositions
210 4894213 Arsenic-aluminum-phosphorus-silicon-oxide molecular sieve compositions
211 4888167 Germanium-aluminum-phosphorus-oxide molecular sieve compositions
212 4885427 Isomerization of unextracted, ethylbenzene-containing xylene streams using a catalyst mixture containing molybdenum on silica and supported crystalline borosilicate molecular sieve
213 4880443 Molecular sieve oxygen concentrator with secondary oxygen purifier
214 4859312 Process for making middle distillates using a silicoaluminophosphate molecular sieve
215 4859311 Catalytic dewaxing process using a silicoaluminophosphate molecular sieve
216 4855270 Boronaaronate molecular sieve
217 4853202 Large-pored crystalline titanium molecular sieve zeolites
218 4851106 Process for the use of chromium-aluminum-phosphorus-oxide molecular sieve compositions
219 4829040 Catalyst containing an intermediate pore molecular sieve for mild hydrocracking
220 4813979 Secondary oxygen purifier for molecular sieve oxygen concentrator
221 4812536 Selective para-ethylation of toluene with magnesium compound-impregnated, crystalline, gallosilicate based, molecular sieve catalyst compositions
222 4789535 Lithium-aluminum-phosphorus-oxide molecular sieve compositions
223 4788380 Titanium-aluminum-silicon-oxide molecular sieve compositions
224 4786294 Integrated gas purification and thermal conditioning system utilizing molecular sieve adsorption
225 4759919 Chromium-aluminum-phosphorus-oxide molecular sieve compositions
226 4742040 Process for manufacturing a carbon molecular sieve
227 4738837 Chromium-aluminum-phosphorus-silicon-oxide molecular sieve compositions
228 4737353 Beryllium-aluminum-phosphorus-silicon-oxide molecular sieve compositions
229 4737170 Molecular sieve bed containers
230 4735806 Gallium-aluminum-phosphorus-silicon-oxide molecular sieve compositions
231 4734394 Process for producing molecular sieve carbon fibers
232 4725570 Post-treatment of AMS-1B crystalline borosilicate molecular sieve-based catalyst compositions
233 4721607 Process for the production of boronaaronate molecular sieve using ethylenediamine and quinoline or isoquinoline
234 4689138 Catalytic isomerization process using a silicoaluminophosphate molecular sieve containing an occluded group VIII metal therein
235 4683050 Mild hydrocracking with a catalyst containing an intermediate pore molecular sieve
236 4673767 AMS-1B crystalline borosilicate molecular sieve-based catalyst compositions and process for toluene alkylation
237 4670617 Propylation of toluene with a high surface area, zinc-modified, crystalline silica molecular sieve
238 4670616 AMS-1B crystalline borosilicate molecular sieve-based catalyst compositions and process for toluene methylation
239 4665254 AMS-1B crystalline borosilicate molecular sieve-based catalyst compositions and process for xylene methylation
240 4661124 Molecular sieve type gas separation systems
241 4656966 Method and apparatus for developing electrographic images uses molecular sieve zeolite
242 4654456 AMS-1B crystalline borosilicate molecular sieve-based catalyst compositions and process for xylene isomerization
243 4652691 Selective ethylation of xylene with a metal-modified, crystalline borosilicate molecular sieve
244 4650783 Phosphorus modified alumina molecular sieve and method of manufacture
245 4622214 Method for the preparation of crystalline molecular sieve materials wherein the organic template is an enantiomer
246 4610796 Fabric softener composition containing molecular sieve zeolite
247 4601992 Product and process for the production of granules of high mechanical strength and containing molecular sieve
248 4594080 Molecular sieve type gas separation systems
249 4551438 Oligomerization of liquid olefin over a nickel-containing silicaceous crystalline molecular sieve and hydrocarbyl aluminum halide
250 4543446 Vaporization-cooled transformer havig provisions for replenishment of molecular sieve material

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