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4029733 |
Extraction of metals from sea nodules
The method comprises the steps of crushing of the ore, neutralization by a mixture of water and sulphuric acid, introduction of a controlled quantity of sulphur dioxide gas at a pH value between...
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4006214 |
Process for the recovery of fluorine from an aqueous solution
A process for the treatment of aqueous solutions containing cations and anions, including aluminum sulphate and fluoride ions, for the recovery of the fluorine contained in the aqueous solution by...
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3997474 |
Activation of ferrierite
Ferrierite ore is activated for normal paraffin conversion by exchanging with the ammonium ion, heating in air at a temperature from about 775° to about 1000° F and exchanging again with the...
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3988224 |
Method of extraction of metallic elements from submarine nodules
A hydrochloric acid leach solution is subjected to a first cycle of extraction by an organic solvent, solvent washing and stripping so that the stripping liquor contains iron, zinc, cadmium and...
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3971843 |
Process for liquid/liquid extraction of gallium
The recovery of gallium present in aqueous solution which may also contain a compound of aluminum and sodium, in which the aqueous solution is contacted with a substituted hydroxyquinoline in...
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3969276 |
Method of manufacturing a zeolitic adsorbent
A method of manufacturing an adsorbent comprising X or Y zeolite containing one or more selected cations at the exchangeable cationic sites. The method basically comprises the steps of: contacting...
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3966909 |
Solvent extraction of aluminum
A process is described for the selective recovery of aluminum from an impure solution in which aluminum is dissolved, comprising contacting said solution with a symmetrical bis(3,5-C 1 -C 10 ...
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3965238 |
Method of recovering uranium
Uranium values are obtained from phosphate rock by acidifying phosphate rock containing uranium values and at least one other heavy metal with a mineral acid so as to obtain a crude acid, solvent...
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3960774 |
Zeolitic adsorbent for xylene separation
A solid adsorbent useful for the separation of para-xylene from a mixture of C 8 aromatic hydrocarbons. The adsorbent is prepared by the steps of: ion-exchanging a precursor mass containing type X...
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3958982 |
Aluminum extraction process
A process for the extraction and recovery of aluminum from aluminum-containing raw materials by contacting said raw materials with fruit juices and complexing organic acids.
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RE28629 |
Ion exchange of crystalline zeolites
Method of cation exchanging zeolites comprising a conventional ion exchange step, whereby the more easily exchangeable cations are ion exchanged, followed by a calcination step at 400° to 1500°...
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3920450 |
Solvent extraction of In and/or Ga
A method of extracting metal values by contacting a solution containing at least one metal of gallium and indium with a cation exchange solvent of a tertiary saturated aliphatic acid dissolved in a...
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3898043 |
Apparatus for decomposing concentrated aqueous aluminum nitrate solutions
Fluidized bed apparatus for thermally decomposing an aqueous aluminum nitrate solution to form an alumina product and nitric acid. The fluidized bed includes means to heat the bed particles by...
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3887681 |
Separation of gallium from alkaline liquors using acetylacetone
A process for separating gallium which is dissolved in an aqueous alkaline solution comprising the steps of adding to the solution a complexing agent which is a compound of the β-diacetone type,...
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3878129 |
Method of manufacturing a zeolitic adsorbent useful for aromatic separation
A method of manufacturing a solid adsorbent which method comprises the steps of: contacting a base material containing type X or type Y zeolite with a fluoride-containing solution of sodium...
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3878128 |
Method for manufacturing an adsorbent useful for olefin separation
A method for the production of a solid adsorbent useful in the separation of olefins from a hydrocarbon feed mixture comprising olefins and paraffins. The method basically comprises the steps of:...
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3878127 |
Method of manufacturing a zeolitic absorbent
A method of manufacturing a solid adsorbent for the separation of para-xylene from a mixture of C 8 aromatic hydrocarbons. The method basically comprises the steps of: ion-exchanging a precursor...
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3867307 |
EXCHANGED FAUJASITE
Synthetic faujasite is exchanged with a combination of rare earth and transition metal ions. The resulting exchanged faujasites possess high thermal and steam stabilities and find utility as...
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3855385 |
RECOVERY OF RHENIUM FROM A SPENT CATALYST
Rhenium is recovered from a spent platinum-rhenium-alumina catalyst containing molybdenum. The spent catalyst is first treated with sulfuric acid to form a rhenium and molybdenum-containing...
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3853787 |
PROCESS FOR PREPARING METAL ZEOLITE CATALYST COMPOSITIONS
In order to increase the amount of catalytic metal which can be incorporated in a zeolite catalyst by contact of zeolite with solution of a given amount of chemical containing the catalytic metal,...
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3839222 |
EXTRACTION OF BORON FROM AQUEOUS SOLUTIONS WITH SALICYLIC ACID DERIVATIVES AND ISOAMYL ALCOHOL
A process for extracting boron from aqueous boron containing solutions by contacting the aqueous solution with a substantially water immiscible salicylic acid derivative or a salt thereof, nuclear...
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3812238 |
EXTRACTION OF BORON FROM AQUEOUS SOLUTIONS WITH SALICYIC ACID DERIVATIVES AND ISOAMYL ALCOHOL
A process for extracting boron from aqueous boron containing solutions by contacting the aqueous solution with a substantially water immiscible salicylic acid derivative or a salt thereof, nuclear...
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3812232 |
SOLVENT EXTRACTION PROCEDURE FOR SEPARATING SAMARIUM FROM NEODYMIUM
Separation of mixtures of metals, particularly complex lanthanide mixtures, in aqueous solution is accomplished by means of a process comprising total extraction of metal values into an organic...
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3783158 |
PROCESS FOR RECOVERING VOLATILIZED METAL OXIDES FROM GAS STREAMS
Certain organic compounds in solution other than aqueous are used to directly recover oxides of metals that form anionic species therewith, from gas streams carrying such metal oxides in...
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3755161 |
TREATMENT PROCESS FOR REMOVAL OF METALS AND TREATING AGENT THEREFOR
A treament process for removing metals from a gaseous phase or liquid phase metal-containing material using a solid treating agent consisting of a carrier material and a compound deposited thereon,...
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3725527 |
PROCESS FOR RECOVERING PURE AQUEOUS SOLUTION OF FERRIC CHLORIDE AND AQUEOUS SOLUTION OF METAL CHLORIDES FREE OF FERRIC CHLORIDE FROM FERROUS METAL MATERIAL
Iron material consisting of iron metal having associated minor amounts of other noniron metals is reacted with hydrochloric acid solution to form an aqueous solution of metal chlorides, which...
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3725528 |
QUANTITATIVE ION EXCHANGE PROCESS FOR CLAY
A quantitative ion exchange process for preparing modified clay is disclosed. Clay such as montmorillonite is converted (1) to an acid-free hydrogen-clay by use of an anion (hydroxide) exchange...
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3699207 |
PROCESS FOR THE PURIFICATION OF CADMIUM SOLUTIONS
Process for producing cadmium solutions wherein said solution is contacted with a cation exchanger containing amino carboxylic- or imino carboxylic acid groups and wherein the ion exchanger is...
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3650679 |
REFINING LOW-GRADE BERYLLIUM ORES BY TREATMENT WITH ANHYDROUS SULFUR TRIOXIDE
Low-grade substantially dry beryllium-containing ores are reacted directly with anhydrous sulfur trioxide, at temperatures ranging from 50° to 350° C., to form beryllium sulfate. The reaction...
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3645682 |
A PROCESS FOR PRODUCING PHOSPHORIC ACID BY THE USE OF ION EXCHANGE RESINS
The invention relates to an improved method of ion exchange. The inventive concept involves directly contacting a substantially dry ion exchange resin with a substantially dry material which...
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3615174 |
PROCESS FOR THE SELECTIVE RECOVERY OF POTASSIUM AND MAGNESIUM VALUES FROM AQUEOUS SALT SOLUTIONS CONTAINING THE SAME
Kainite immersed in brine in equilibrium converted to carnallite by cooling to about 10° C. or under. Carnallite so obtained purified by cold flotation. Purified carnallite water leached to yield...
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3545920 |
PROCESS FOR EXTRACTING ALUMINUM FROM SOLUTIONS
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3537816 |
PROCESS FOR REDUCING THE ALKALI METAL CONTENT OF FAUJASITE TYPE CRYSTALLINE ZEOLITES
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3531243 |
PREPARATION OF MORDENITE
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3518063 |
PURIFICATION OF BERYLLIUM BY LIQUID-LIQUID EXTRACTION
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3514266 |
SEPARATION OF ALUMINUM,CALCIUM,AND MAGNESIUM FROM THE ALKALI METALS BY SOLVENT EXTRACTION
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3482933 |
PROCESS FOR THE PRODUCTION OF PHOSPHORIC ACID AND CALCIUM ALUMINATE
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3473919 |
PROCESS FOR SEPARATING IRON FROM ALUMINUM
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3457032 |
PROCESS FOR PURIFYING SOLUTIONS CONTAINING ALUMINATES
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3448043 |
ION EXCHANGE PROCESS
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3431218 |
CONVERSION OF CLAYS TO CRYSTALLINE ALUMINOSILICATES AND CATALYSTS THEREFROM
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3411868 |
Production of beryllium fluoride
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3409414 |
EXTRACTION OF BERKELIUM VALUES IN THE TETRAVALENT STATE USING 2-THENOYLTRIFLUOROACETONE
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3408305 |
Modified montmorillonite containing exchangeable ammonium cations and preparation thereof
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3382039 |
Preparation and use of silver zeolites of improved exchange capacity
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3374090 |
Process for the extraction of metals
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3360344 |
Extraction of the sulfuric acid complexes of beryllium using primary amines
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3359064 |
Process for separating beryllium values from aqueous solutions
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3343912 |
Recovery of aluminum nitrate from aqueous solutions
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3335098 |
Cracking catalyst and preparation thereof
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