4086 results about "Cyanide" patented technology

PCT No. PCT/JP97/00578 Sec. 371 Date Aug. 11, 1998 Sec. 102(e) Date Aug. 11, 1998 PCT Filed Feb. 27, 1997 PCT Pub. No. WO97/32030 PCT Pub. Date Sep. 4, 1997A process for preparing alpha -hydroxy acids represented by the general formula (II): RCH(OH)COOH (wherein R represents a hydrogen atom, an optionally substituted C1-C6 alkyl group, an optionally substituted C2-C6 alkenyl group, an optionally substituted C1-C6 alkoxy group, an optionally substituted aryl group, an optionally substituted aryloxy group, or an optionally substituted heterocyclic group) by allowing a microorganism to act on alpha -hydroxy nitriles (I): RCH(OH)CN (wherein R is as defined above) to hydrolyze and convert the alpha -hydroxy nitrites to alpha -hydroxy acids (II), wherein the alpha -hydroxy acids (II) are produced and accumulated in an aqueous solvent by a microorganism having the concentration resistance to the alpha -hydroxy nitrites (I) and/or alpha -hydroxy acids (II) and durability preferably in the presence of a cyanide, and harvested. According to this process, the use of the microorganism having the concentration resistance to the alpha -hydroxy nitriles (I) and/or alpha -hydroxy acids (II) and durability high enough to permit the activity to persist for a long period of time enables alpha -hydroxy acids (II) to be accumulated in high concentrations and cell bodies to be repeatedly used, and hence enables alpha -hydroxy acids (II) to be efficiently prepared. The addition of a cyanide to the reaction system results in more efficient preparation of alpha -hydroxy acids (II).

The invention discloses a preparation method of rare earth-doped double metal cyanide catalyst and a method for preparing low molecular weight poly (carbonic ester-ether) glycol by using the catalyst to catalyze the copolymerization of carbon dioxide and epoxy compounds. The preparation method of poly (carbonic ester-ether) glycol comprises the following steps: using rare earth-doped double metalcyanide based on Zn3[Co(CN)6]2 as a catalyst, and letting carbon dioxide and epoxy compounds be subject to polymerization in the presence of chain transferring agent to obtain the poly(carbonic ester-ether) glycol. According to the invention, compared with the prior art, the rare earth-doped double metal cyanide based on Zn3[Co(CN)6]2 used herein efficiently catalyzes the copolymerization of carbon dioxide and epoxy compounds under the effect of chain transferring agent; and compared with double metal cyanide without doping, the rare earth-doped double metal cyanide based on Zn3[Co(CN)6]2 used herein has higher catalytic activity and better product selectivity.

The invention discloses a preparing method of poly (carbonic ester-ether) polyalcohol. Rare-earth doped bi-metal cyanides based on Zn3[Co(CN)6]2 serve as catalysts, carboxylic acids serve as chain transfer agents, and carbon dioxide and epoxy compounds are performed with a copolymerization reaction to obtain the poly (carbonic ester-ether) polyalcohol. Compared with the prior art, the carboxylic acids serve as chain transfer agents, and due to the fact that the carboxylic acids are strong in coordination capability, faster in chain transfer, capable of restraining continuous inserting of epoxy monomers and free of ether structure, unit content of carbonic ester is improved, and the prepared poly (carbonic ester-ether) polyalcohol has higher carbonic ester unit content. Experimental results indicate that molecular weight of the prepared poly (carbonic ester-ether) polyalcohol is 1500g/mol-5000g/mol, molecular weight distribution is 1.11-1.50, unit content of the carbonic ester is 40%-80%, catalytic activity is larger than 1.0kg/gLn-DMC, and cyclic carbonic ester content is less than 10wt%.

The invention discloses a stabilized curing agent for heavy metal contaminated soil or solid waste treatment and a treatment method. The stabilized curing agent comprises the following components in parts by weight: 5 to 10 parts of a magnesium-based compound, 1 to 5 parts of a sulfur-based compound and 1 to 3 parts of an activated silicon-based compound. The treatment method comprises the following steps of sampling inspection, experimental determination of adding proportion, mixing, backfill maintenance, sealing up for safekeeping and the like. The stabilized curing agent disclosed by the invention has an efficient long-term stabilizing effect on various heavy metals such as arsenic, mercury, hexavalent chromium, lead, cadmium, nickel, tin and cyanide, the repeated acid and alkali leaching experiments prove that the stabilized and cured harmful heavy metals cannot be dissolved out again, and the defects that in the traditional technology, the treatment effect and treatment agents are greatly affected by the environment, the long-term efficacy of harmless stabilization is poor, the medicament adding amount is difficult to control and the re-dissolution of harmful heavy metals is easily caused by the high alkalinity of cement solidification and the like are overcome.

The present invention relates to a process for the preparation of a double metal cyanide (DMC) catalyst, which process involves:

• • (a) combining an aqueous solution of metal salt with an aqueous solution of a metal cyanide salt and reacting these solutions; and
  • (b) recovering the DMC catalyst from the reaction mixture,

in which process the DMC catalyst is prepared in the presence of from 0.03 to 0.4 mole of alkaline metal compound, based on amount of metal salt. Further, the present invention relates to DMC catalyst obtainable by such process, to DMC catalyst prepared from a metal salt and a metal cyanide salt in which the molar ratio of metal derived from the metal salt to metal derived from the metal cyanide salt is at least 2.25 and to a process for polymerization of alkylene oxides which process involves reacting initiator with alkylene oxide in the presence of at most 15 ppm of DMC catalyst. It also relates to a process for the polymerization of alkylene oxides in which the resulting polyol contains less than 60 ppm of ultra-high molecular weight compounds.

The present invention provides a pyrophosphoric acid bath for use in Cu-Sn alloy plating without containing a cyanic ion comprising a reaction product (A) of an amine derivative and an epihalohydrin in a 1:1 mole ratio and a cationic surfactant (B) and, when necessary, further comprising a surface tension adjusting agent (C), a bath stabilizer (D) and an N-benzylpyridinium derivative (E) as additives. According to the bath of the present invention, by changing a bath composition of copper and tin or by employing a characteristic additive, a stable film with a silver-white, gold, copper or light black color can be obtained. By increasing tin contents in the bath, the bath can be used for lead-free solder plating. The bath is safe in handling and hygienic and, moreover, has no sewage process and environmental problems since it contains neither cyanic compound nor formaldehyde derivative.

A family protective shelter which can be erected quickly inside in a home living room, family room, patio, or on an outside lawn area. This dome tent enclosure is designed of clear plastic sheet material which is impervious to gases used to conduct chemical warfare (such as nerve gas, mustard gas, serin, cyanide, and the like) dispersed biohazard aerosol compounds (such as anthrax, smallpox, polio, bacteria, viruses, or fungi), or other atmospheric toxins, such as those from a nuclear fallout. This protective “pop-up”, external frame enclosure will be sized to house at least two adults comfortably (6×9×7 high inside, up to about 10×18′×7′ high), will incorporate a zip-lock entrance/egress isolation portal chamber, and will communicate to the outside world through combat gas mask filters, plus phone, computer and electrical outlet feed-through, and perhaps a water trap coupling. The invention can keep a family of 1 to 10 (with a larger size) relatively isolated and safe from the harmful effects of a chemical biohazard, or nuclear fallout enemy attack for a matter of hours up to several days. The portal chamber can also connect together additional modules.

An alkaline non-cyanide plating solution for copper-plating used on iron and steel base and a preparation method thereof relate to a kind of plating solution. The invention provides the alkaline non-cyanide plating solution for copper-plating used on iron and steel base and the preparation method thereof. The plating solution comprises the following components: main salt, complexing agent, conductive salt, activator, cuprous ion complexing agent, pH stabilizer and brightening agent. The method comprises the following steps: adding complexing agent in water, stirring to dissolve complexing agent, obtaining a solution A; adding main salt in the solution A, stirring to dissolve main salt, obtaining a solution B; adding conductive salt in water, stirring to dissolve conductive salt, obtaininga solution C; mixing the solution B and solution C, adjusting the pH value to 2.0-4.5 with sulfuric acid or sodium hydroxide, obtaining a solution D; adding additive in the solution D, adding water toperform constant volume process and obtaining the alkaline non-cyanide plating solution for copper-plating in the desired volume for use, wherein the additive is activator, cuprous ion complexing agent, pH stabilizer and brightening agent.

The present invention relates to a polyether carbonate polyol made by copolymerizing a starter molecule with carbon dioxide, at a pressure ranging from about 10 psia to about 2,000 psia, and an alkylene oxide, at a temperature ranging from about 50° C. to about 190° C. and in the presence of from about 0.001 wt. % to about 0.2 wt. % of a substantially non-crystalline double metal cyanide (DMC) catalyst, wherein the polyol has an incorporated carbon dioxide content of from about 1 wt. % to about 40 wt. %, wherein the ratio of cyclic carbonate by-product to total carbonate is less than about 0.3 and wherein the weight percentages are based on the weight of the polyol. The inventive polyether carbonate polyols may find use in producing polyurethane foams, elastomers, coatings, sealants and adhesives with improved properties.

A polyethercarbonate polyol includes polyethercarbonate segments, polycarbonate segments, and polyether segments. A method of forming the polyethercarbonate polyol provides a catalyst, including a multimetal cyanide compound, and reacts an H-functional initiator, an alkylene oxide, and carbon dioxide in the presence of the multimetal cyanide compound to form the polyethercarbonate polyol. Amounts of each segment in the polyethercarbonate polyol are selectively controlled.

The invention relates to a high-efficient combined inhabitor for pyrite in complex sulfide ores and the application method of the inhabitor. The inhabitor comprises calcium superoxide and HA-Na. The inhabitor of the invention can inhibit complex vulcanized iron-bearing minerals selectively, has better inhibition properties for magnetic pyrite, pyrite and arsonopyrite, and is an inhabitor of high selectivity. Compared with the prior inhibitors such as lime, cyanide, bichrome, potassium permanganate, sodium sulfide, sulphite, zinc sulphate and trisodium phosphate, the invention has the advantages of lower use level, good effects, no pollution, and other advantages.

The invention provides a high-temperature disposal method for spent cathodes of electrolytic aluminum. The method comprises the following steps: spent cathode carbon blocks of electrolytic aluminum are crushed into particles of 3-15 mm; then roasting is carried out by using a super high temperature furnace, fluorides in the spent cathode carbon blocks are volatilized, cyanides in the spent cathode carbon blocks are decomposed, flue gas generated during roasting is absorbed through a water spray absorption mode; then, processes such as filtering, drying and the like are carried out, the fluorides and the like are reused in aluminum electrolysis; and a cathode carbon material is discharged out of the super high temperature furnace after the material is cooled. According to the physical and chemical properties of the fluorides, the cyanides and carbon in the spent cathodes of electrolytic aluminum, the fluorides in the spent cathode carbon blocks are volatilized, the cyanides in the spent cathode carbon blocks are decomposed with the high-temperature method; however, on the condition of primary vacuum, carbon in the cathodes cannot burn, so that effective separation of carbon, the fluorides and the cyanides in the cathodes is achieved, and hazard-free disposal and resource utilization of the spent cathodes of electrolytic aluminum are achieved.

The invention relates to composite aerogel of graphene/Prussian-blue complexes, and a preparation method and application thereof. The composite aerogel is in a three-dimensional network structure formed by graphene sheets. Particles of the Prussian-blue complexes are nano-scaled and attach to the graphene sheets. The preparation method of the composite aerogel includes adding metallic cyanide in graphene oxide suspension, allowing for dispersion to obtain suspension A, dissolving metal salt in aqueous solution containing reductant to obtain solution B, ultrasonically mixing the suspension A and the solution B, allowing for standing, and drying to obtain the composite aerogel. The composite aerogel is large in specific surface area and low in density and is highly conductive. The preparation method of the composite aerogel is simple to operate, low in cost and applicable to large-scale industrial production. The composite aerogel has excellent hydrogen storage performance, hydrogen peroxide catalytic reduction and electrochromic property.

The present invention relates to active charcoals with improved mechanical properties. They can advantageously be used in the sweetening of petroleum fractions, as oxidation catalyst support in the conversion of mercaptans to disulphides, but also in any other type of reaction, such as, for example, for the oxidation of cyanide present in water or in the synthesis of glyphosate, and in processes for purification and/or separation by selective adsorption in a liquid phase and/or in a gas phase (decolouration of liquid foodstuffs, water treatment, air treatment, recovery of solvents, and the like).

The invention relates to a comprehensive recovery method of waste and old cathode charcoal block of an aluminium electrolytic tank, and belongs to the technical field of comprehensive utilization of industrial solid waste resources. The method is as below: crushing and grinding waste and old cathode charcoal block of the aluminium electrolytic tank at 200-400 DEG C, insulating, removing cyanide, conducting flotation separation on the material with cyanide removed to obtain carbon slag and electrolyte slag, heating the electrolyte slag at 550-800 DEG C to remove carbon impurities, so as to obtain an electrolyte powder, removing to soluble substances in the electrolyte slag by alkali leaching to obtain a carbon powder with high purity, and precipitating a mixture of cryolite and aluminium hydroxide form the alkali leaching liquid by CO2. The invention has the advantages of reasonable process design, simple process, high treatment efficiency, high recovery rate and recycling rate of each material and no secondary pollution, and is applicable to large-scale industrial application.

The present invention provides a process for preparing a polyoxyalkylene polyol by polyoxyalklating a starter compound with a mixture of two different alkylene oxide monomers in which the first alkylene oxide monomer content of the mixture decreases as the content of the second alkylene oxide monomer increases over the course of the polyoxyalkylation, digesting unreacted monomers of the alkylene oxides and capping the polyol.

This invention discloses a wet pre-process method for unwieldy gold mines containing As and Sb and a method for picking up gold not using cyanogens, which applies two steps of wet pre-process and no cyanogens to pick up gold and turns As and Sb to soluble materials to be solved in water and turns them in the state not influending the soak of gold then to remove them, which alters the tranditional method for picking up gold with cyanides, thus, gold can be picked up smoothly from the unwieldy gold mines of the type of fine particle dip-dye containing AS and Sb, the pick-up rate reaches to 70-95%.

Disclosed is an electroplating solution for the deposition of silver; said solution containing silver in the form of a complex of silver with hydantoin or a substituted hydantoin compound; said solution also containing an excess of the hydantoin or substituted hydantoin compound employed, together with an effective quantity of a nonprecipitating electrolyte salt, and also an effective quantity of 2,2′ dipyridyl for the purpose of obtaining a mirror-bright to brilliant deposit.

The invention discloses a method for preparing aliphatic polycarbonates by catalyzing by the metal cyanide coordination catalyst. In a high pressure reactor, the metal cyanide coordination catalyst is utilized to catalyze epoxide and carbon dioxide body or solution copolymerization, wherein, the copolymerization temperature is 20-150 DEG C; the carbon dioxide pressure is 0.5-10MPa; the reaction time is 1-48h; the catalyst concentration is 1-100kg epoxide/g catalyst; the polymerization activity is more than 1.0kg of polymer/g catalyst; the weight-average molecular weight of the copolymer is more than 80 thousand; the molecular weight distribution is 1.5-4; the alternation degree of the copolymer is more than 90%; the cyclic carbonate by-product is less than 5wt%; the CO2 fixed rate of CO2/epoxypropane copolymer is more than 40wt%; and the CO2 fixed rate of CO2/cyclohexene oxide copolymer is more than 30wt%.

The present invention provides flexible polyurethane foams made from at least one polyisocyanate and at least one vegetable oil alkoxylated in the presence of a double metal cyanide (DMC) catalyst, optionally at least one non-vegetable oil-based polyol, optionally in the presence of at least one of blowing agents, surfactants, pigments, flame retardants, catalysts and fillers. The alkoxylated vegetable oils are environmentally-friendly, bio-based polyols which can be used to increase the “green” content of polyurethane foams without having detrimental effects on foam properties.

The invention relates to a combinational electroplating process on a magnesium alloy motorcycle wheel nave by adopting a non-cyanide and chrome free pre-plating treatment solution, electronickelling and pyrophosphate copper are adopted as dual-layer bottoming coat, then Cu/Ni/Cr combinational coat electroplating is performed, to obtain the Cu/Ni/Cr combinational metal coat with high corrosion resistance on the surface of the magnesium alloy motorcycle wheel nave. The binding force of the metal coat obtained on the surface of the magnesium alloy motorcycle wheel nave by adopting the process is strong, the corrosion resistance is high, and the combinational electroplating process has the prominent advantages that the personnel health is safeguarded, and the environmental pollution is avoided.

The invention relates to a method for removing cyanide in waste cathode carbon in an aluminum electrolysis cell, and belongs to the technical field of aluminum electrolysis solid waste resource recycling. After being levigated, an aluminum electrolysis cell waste cathode carbon block is added in water to be immersed; filtering is conducted after immersing, and first filter liquor and first filter slag are obtained; the reaction is conducted at the temperature of 30 DEG C to 70 DEG C after hydrogen peroxide, a stabilizing agent and a catalyst are added in the first filter liquor; filtering is conducted after the reaction, and second filter liquor and second filter slag are obtained; the second filter liquor is evaporated, distilled water and a crystal substance are obtained, and an oxidative product is decomposed into utilizable gas (CO2 and NH3). Treatment of the waste cathode carbon block with high efficiency and low energy consumption is achieved through the cooperative effect of the hydrogen peroxide, the proper number of the catalyst and the proper number of the stabilizing agent. The technology is simple, controllability is high, closed-loop circulation is achieved, secondary pollution is avoided, the resource utilization rate is high, and large-scale industrial application is facilitated.

The invention belongs to the technical field of metallurgical waste slag recovery and in particular relates to a comprehensive recycling method of cyanide tailing slag. Cyanide tailings is floated to obtain sulfur concentrate and tailing, sulfur concentrate is roasted by weak oxygen to obtain sulfuric acid, and pyritic slag is subjected to chlorination roasting to enable valuable elements to be recycled. By virtue of the comprehensive recycling method disclosed by the invention, the valuable elements can be efficiently separated and recovered from cyanide tailing slag, and cyanide tailing slag is utilized to a maximum extent, the comprehensive utilization efficiency of resources is improved and the pollution of cyanide tailing slag to the environment is reduced.

An environmental non-cyanide plating solution for silver-plating contains silver ion source, amino acid compound and derivative thereof used as complexant, auxiliary complexant and plating additive. The component ratio and the process condition are as follows: the contents of silver salt, amino acid compound and derivative thereof, auxiliary complexant and plating additive are separately 0.01-1mol/L, 0.01-10mol/L, 0.002-2mol/L and 0.001-2.0g/L, the pH value of silver-plating solution is 6-14 and the temperature of the silver-plating solution is 10-70 DEG C. Compared with the traditional cyanide-containing formulation for silver-plating, the environmental plating solution for silver-plating is characterized by clean plating; meanwhile the replacement rate between silver ions in the platingsolution and active metal such as copper, copper alloy and the like and alloy base is extremely slow, the one-step electroplating method is adopted for silver-plating, pre-plating and soaking processes of silver are not needed, and the coating is bright with good binding force.

The invention provides a double-component epoxy resin adhesive, wherein component A comprises epoxy resin and a toughening agent, and component B comprises a curing agent and a curing accelerator, wherein the component A also comprises an unsaturated functional monomer which is selected from one or more of olefinic acid, olefinic acid ester, olefinic cyanide and olefinic alcohol. The invention also provides a preparation method for the double-component epoxy resin adhesive. The double-component epoxy resin adhesive has the advantages of high adhesive strength and good flexibility, and the preparation method has the advantages of simple process and easy operation.