The regeneration method of the charge of the air cleaning unit or artificial breathing gas environment
(57) Abstract:The invention relates to the field of chemical technology, in particular to methods of regeneration of catalysts and adsorbents for the recovery of their properties. Regeneration of the mixture containing the catalyst and the adsorbent, the air cleaning unit or artificial breathing gas environment is carried out by blowing air or air-gas mixture that does not contain catalyst "poisons", at 100 to 220oWith the specific rate of 0.2-1.0 l/(mins2within 40-55 hours Blowing is carried out at normal or reduced pressure, equal 300-600 mm RT.article The regeneration method can be used to restore the properties of the catalyst and adsorbent mixture of blocks and air filters or artificial breathing gas environment directly on the object without dismantling and recharge. 1 C.p. f-crystals. The invention relates to the field of chemical technology, in particular to methods of regeneration of catalysts and adsorbents charge of the cleaning unit, and can be used to restore the properties of the catalyst based on palladium, providing the oxidation of carbon monoxide to dioxide, and particulate adsorbent of harmful substances.m or increased pressure of carbon monoxide based on the oxidation of CO to CO2at the palladium catalyst of the type AK-62, and from such waste products like ammonia, hydrogen sulfide, hydrocarbons and other harmful substances by absorption of solid adsorbents, such as cuprite.The palladium catalyst is very effective in a wide range of relative humidity of the gas environment (up to 99%), at normal and elevated temperatures (up to 100oC) and in large intervals volumetric velocity of the purified gas.However, the catalyst activity is reduced by the presence in the gas environment, the so-called catalyst "poisons", which include ammonia, hydrogen sulfide and other substances. Therefore, to ensure the efficient operation of palladium catalyst in air filters and artificial gas environment need to be protected from its harmful toxic substances. As a means of protection from the catalyst "poisons" is used supramid, which not only provides protection palladium catalyst "poisons", but at the same time cleans the gas environment from harmful for human breathing substances.Activity Capranica cleaning gas environment from harmful substances with increasing operating time decreases, which entails pereterli solid adsorbent, for example zeolite, mainly in dehumidifiers by heating the adsorbent by blowing hot air with an initial temperature of 230-300oC with subsequent cooling of the cartridges in an airtight container (Klimov, L. N., Obukhov N. I. and Belinsky, S. P. Method of regeneration of the solid adsorbent. A. C. 502644 from 06.09.74).The disadvantages of this method of recovery adsorption properties are low efficiency, large energy consumption of the process and regeneration time.There is a method of regeneration of the palladium catalyst on the carrier for deep oxidation of organic substances, including processing chemical reagent - aqueous alkaline oxidizing solution (and.with. 1300713, class B 01 J 23/96, 1992), as well as the regeneration method of the aluminum-palladium catalyst used for the hydration of acetylene hydrocarbons in the process of refining hydrocarbon, C4different degrees of saturation from acetylene hydrocarbons by treatment of the catalyst attivazione mixture containing 0.5 - 5% oxygen at 260 - 350oC, followed by reduction with hydrogen (SU and.with. 801875, class B 01 J 23/96, 1981).As can be seen from the technical solutions known methods include reg the Task, on the solution of the invention, is in the process of regeneration at the same time and catalyst and adsorbent by a purge air or gas-air mixture under certain conditions, the catalyst and the adsorbent should be considered as part of one batch of the air cleaning unit or artificial breathing gas environment.The proposed method of recovery is that the recovery of palladium catalyst is carried out simultaneously with the adsorbent of harmful substances (copromotor) by blowing through the purification filter (without discharge) air or air-gas mixture that does not contain catalyst "poisons", at 100 220oC with the specific flow rate of 0.2 - 1.0 l/(mins2within 40-55 hours While purging is carried out at atmospheric or reduced pressure, equal 300-600 mm RT. Art. carrying out the process under reduced pressure increases the regeneration efficiency and reduces the time to restore the activity of the catalyst and adsorbent.This method can be used for regeneration of the charge units and air filters and artificial breathing gas mixtures directly naoka and filter air cleaning or artificial gas environment from carbon monoxide and harmful substances on the object, and saves the expensive helium and reduces the likelihood of leakage due to a sharp reduction in the number of labor-intensive recharge units high pressure.The application of the proposed method increases the service life of the catalyst and the adsorbent of harmful substances due to their frequent use in long-term operation.In addition, this method of regeneration of the catalyst and the adsorbent of harmful substances increases the efficiency and reliability of the block or filter cleaning air or breathing gas environment from harmful substances, which is especially important to ensure that people are staying on objects at normal and elevated pressures. 1. The regeneration process of the mixture containing the catalyst and the adsorbent, the air cleaning unit or artificial breathing gas environment from carbon monoxide and harmful substances, which consists in the fact that the regeneration is carried out by blowing air or gas-air mixture at 100 - 200oWith the specific rate of 0.2 - 1.0 l/(mins2) during the 40 55 PM2. The method according to p. 1, characterized in that the blowing is carried out at atmospheric pressure or reduced pressure, equal to 300 - 600 mm RT.article
FIELD: noble metal hydrometallurgy.
SUBSTANCE: invention relates to method for acid leaching of platinum method from secondary raw materials, in particular from ceramic support coated with platinum metal film. Target metals are leached with mixture of hydrochloric acid and alkali hypochlorite at mass ratio of OCl-/HCL = 0.22-0.25 and redox potential of 1350-1420 mV.
EFFECT: decreased leaching temperature, reduced cost, improved platinum metal yield.
FIELD: separation of palladium from waste mangani-palladium catalyst and cleaning of palladium.
SUBSTANCE: palladium-containing concentrate is treated with aqua regia solution and palladium is deposited in form of chloropalladate by means of treatment with aqua regia solution with solid ammonium chloride, pulp thus obtained is settled, cooled and filtered; sediment is treated with saturated hydrochloric acid solution of ammonium chloride. Then sediment thus treated is dissolved in water and solution is filtered and neutralized; pallarium is restored to metal by means of hydrochloric acid hydrazine at pH≥2 or formic acid solution at pH≥6; solution is filtered and metallic palladium is washed and dried at 90-100°C. Prior to treatment, mangani-palladium catalyst with aqua regia, it is dissolved in concentrated hydrochloric acid; solution is neutralized by asmmonia to pH=6-7 and treated with formic acid at flow rate no less than 1 l of HCOOH per kg of mangani-palladium catalyst; then mangani-palladium concentrate is filtered, washed and dried at 90-100ºC.
EFFECT: enhanced purity of metallic palladium at minimum losses of catalyst at all stages of chemical treatment.
FIELD: extraction of platinum and rhenium from decontaminated used platinum-rhenium catalysts; reworking of secondary raw materials of petrochemical industry.
SUBSTANCE: proposed method includes high-temperature oxidizing roasting at temperature of 1200-1300°C, wet trapping of rhenium by alkaline solution, leaching-out of cinder in hydrochloric acid solution at concentration of 100-150 g/dm3 in presence of oxidizing agent for setting the oxidizing-reducing potential of platinum electrode in pulp relative to saturated silver-chloride electrode equal to 850-1000 mV. Used as oxidizing agent is sodium hypochlorite or elementary chlorine or hydrogen peroxide.
EFFECT: enhanced efficiency of process.
1 tbl, 13 ex
FIELD: inorganic synthesis catalysts.
SUBSTANCE: ammonia synthesis catalyst includes, as catalytically active metal, ruthenium deposited on magnesium oxide having specific surface area at least 40 m2/g, while concentration of ruthenium ranges between 3 and 20 wt % and content of promoter between 0.2 and 0.5 mole per 1 mole ruthenium, said promoter being selected from alkali metals, alkali-earth metals, lanthanides, and mixtures thereof. Regeneration of catalytic components from catalyst comprises following steps: (i) washing-out of promoters from catalyst thereby forming promoter-depleted catalyst and obtaining solution enriched with dissolved promoter hydroxides; (ii) dissolution of magnesium oxide from promoter-depleted catalyst in acidic solvent wherein ruthenium is insoluble and thereby obtaining residual ruthenium metal in solution enriched with dissolved magnesium compound; and (iii) regeneration of residual ruthenium metal from solution enriched with dissolved magnesium compound via liquid-solids separation to form indicated solution enriched with dissolved magnesium compound and ruthenium metal.
EFFECT: increased catalyst activity.
6 cl, 6 ex
FIELD: hydrogenation-dehydrogenation catalysts.
SUBSTANCE: invention provides catalytic composition for dehydration of alkylaromatic hydrocarbons optionally combined with ethane comprising: carrier consisting of alumina in δ phase or in θ phase, or in mixed δ+θ or θ+α, or δ+θ+α phase, modified with silicon oxide and having surface area less than 150 m2/g as measured by BET method; 0.1-35% gallium in the form of Ca2O3; 0.01-5% manganese in the form of Mn2O3; 0-100 ppm platinum; and 0.05-4% alkali or alkali-earth metal oxide, all percentages being based on the total weight of composition. Other variants of composition are also covered by invention. Methods of preparing such catalytic composition (options) envisage use of alumina-based carrier in the form of particles corresponding to group A of the Geldart Classification. Process of dehydration of alkylaromatic hydrocarbons optionally combined with ethane comprises: (i) dehydration of hydrocarbon stream optionally mixed with inert gas in fluidized-bed reactor in presence of catalytic composition consisted of alumina-supported and silica-modified gallium and manganese at temperature within a range of 400 to 700°C, total pressure within a range of 0.1 to 3 atmospheres, and gas hourly space velocity from 50 to 10000 h-1; and (ii) regeneration and heating of catalyst caused by catalytic oxidation of fuel in fluidized-bed reactor at temperature above 400°C.
EFFECT: increased activity of catalytic composition and prolonged lifetime thereof.
22 cl, 2 tbl, 16 ex
FIELD: methods of extraction and separation of platinum and rhenium in processing waste bimetallic reforming catalysts.
SUBSTANCE: proposed method includes alkali sintering and aqueous leaching-out for obtaining the solution containing sodium permeate and insoluble residue. Alkali sintering is carried out in presence of oxidant in form of agent generating the gaseous sulfur anhydride, sodium bisulfate or sodium permeate in particular. Insoluble residue is leached-out with hydrochloric acid for dissolving of platinum. Through extraction of rhenium and platinum into commercial product ranges from 96.6 to 99.2%, respectively. Proposed method requires no special equipment.
EFFECT: high degree of extraction of platinum and rhenium.
3 cl, 2 ex
SUBSTANCE: method of regeneration of the palladium catalyst of the hydrogenation of acetylenic hydrocarbons is described by processing it using an inert gas, then by mixture of an inert gas with an oxygen-containing gas at raised temperature till the content of CO2 in the outgoing regeneration gas is less than 0,05 % vol., cooling of the catalyst, the subsequent restoration of the catalyst from the oxidized form of palladium up to metal in an atmosphere of hydrogen containing gas and its cooling up to the temperature of the reaction of hydrogenation, and the catalyst after inert-gas flushing, additionally blow hydrogen-containing gas at the temperature 200-250°C and regeneration of the catalyst layer in adiabatic reactor is conducted separately, with a separate supply and outlet of regeneration gas for each catalyst layer.
EFFECT: improvement of restoration of operational characteristics of the palladium catalyst at carrying out the of process of regeneration.
3 cl, 2 tbl, 6 ex
SUBSTANCE: invention relates to methods of reducing platinum-rhenium reforming catalyst and can be used on oil-refining, petrochemical and gas production enterprises. A method is proposed for reducing platinum-rhenium reforming catalyst through high temperature treatment with a circulating reforming hydrogen-containing gas, containing an additive of sulphur compounds in amount of 0.05-0.30 % of the mass of catalyst (in terms of sulphur) in two stages. The method is distinguished by that, the platinum-rhenium catalyst is pre-treated only with hydrogen-containing gas at temperature 480-500°C for 2-4 hours, and treatment with sulphur compound additives at the first stage is done at temperature 480-400°C, and 280-260°C at the second stage.
EFFECT: significant increase of octane number of reformate, as well as inter-regeneration cycle of the catalyst.
4 cl, 2 ex
SUBSTANCE: invention refers to particles of metal oxide carrier of catalyst, method of such particle obtainment, waste gas treatment catalyst including metal oxide catalyst, and method of waste gas treatment catalyst recovery. Invention describes particle of metal oxide catalyst carrier, consisting of central part and external shell part, where both central and external shell parts include first metal oxide and second metal oxide, central part and external shell part differ in composition, molar fraction of first metal oxide is higher in central part than in external shell part, molar fraction of second metal oxide is higher in external shell part than in central part, and first metal oxide is aluminium or zirconium oxide while second metal oxide is selected out of group including neodymium, praseodymium, lanthanum, scandium and yttrium oxides. Invention describes waste gas treatment catalyst including the claimed particle of metal oxide carrier and platinum applied onto the particle of metal oxide catalyst carrier. Invention describes method of waste gas treatment catalyst recovery involving waste gas treatment catalyst heating at 500°C or higher in oxidation medium including oxygen. Also invention describes method of obtaining particle of metal oxide catalyst carrier, consisting of central part and external shell part, where both parts include first metal oxide and second metal oxide, central part and external shell part differ in composition. Method involves obtainment of material solution including at least colloid particles of first metal oxide and metal salts of second metal oxide, where first metal oxide is aluminium or zirconium oxide, second metal oxide is selected out of group including neodymium, praseodymium, lanthanum, scandium and yttrium oxides; achievement of solution pH close to isoelectric point of colloid particles of first metal oxide so as to coagulate colloid particles of the first metal oxide; solution pH increase so as to cause precipitation of colloid particles of the second metal oxide from metal salts and coagulate colloid particles of the second metal oxide around coagulated colloid particles of the first metal oxide, where isoelectric point of colloid particles of the second metal oxide is higher than isoelectric point of colloid particles of the first metal oxide; and coagulated product drying and calcination.
EFFECT: increased specific area of waste gas treatment catalyst surface, increased degree of platinum particle recovery.
10 cl, 19 ex, 2 tbl, 3 dwg
SUBSTANCE: invention relates to a catalyst for cleaning exhaust gases, a method of regenerating such a catalyst, as well as a device and a method of cleaning exhaust gases using the said catalyst. The invention describes a catalyst for cleaning exhaust gases where a noble metal is attached to a metal oxide support. In an oxidative atmosphere, the noble metal on the surface of the support is in a high oxidation state and the noble metal is bonded to the cation of the support though an oxygen atom on the surface of the support with formation of a surface oxide layer. In a reductive atmosphere, the noble metal on the surface of the support is metallic state and the amount of noble metal open on the surface of the support, measured through CO chemisorption, is equal to or greater than 10 at % of the total amount of noble metal attached to the support. Described is a method of regenerating a catalyst for cleaning exhaust gases in which the above described catalyst for cleaning exhaust gases undergoes oxidative treatment by heating in an oxidative atmosphere which contains oxygen, and reduction treatment. Described also are devices for cleaning exhaust gases (versions) and a method of cleaning exhaust gases, involving cleaning exhaust gases by bringing the exhaust gases into contact with the above described catalyst.
EFFECT: prevention of reduction of catalyst activity.
18 cl, 11 tbl, 46 ex, 10 dwg