346 results about "Cyanide compound" patented technology

The invention relates to a green preparation method of fluopyram intermediate 3-chloro-5-(trifluoromethyl)-2-ethylaminopyridine, which comprises the following steps: step 1, Ullmann reaction: coupling 3-chloro-2-methyl-5-trifluoromethylpyridine (C1) and N-bromomethyl phthalimide (C2) in the presence of a copper catalyst and potassium tert-butoxide to generate an intermediate (C3); and step 2, hydrolysis reaction: hydrolyzing the intermediate (C3) in the presence of hydrazine sulfate and an alkaline condition to generate the fluopyram intermediate 3-chloro-5-(trifluoromethyl)-2-ethylamino pyridine. The method has the advantages of short synthesis steps, easily available raw materials, no use of high-toxicity cyanogen compounds, low catalyst cost, difficult poisoning, recycling, simple post-treatment process, and less waste liquid generation, greatly reduces the production cost, improves the production safety, reduces the waste liquid discharge amount, and accords with the idea of green synthesis.

The invention provides a method for recycling valuable substances and cyanide in cyanide-containing wastewater, and belongs to the technical field of cyanide-containing wastewater treatment. The method comprises the following steps: firstly, carrying out replacement reaction on a physicochemical material (reducing substance zinc) and a copper-cyanogen complex in the cyanogen-containing wastewater to displace copper, and filtering to obtain filter residues containing zinc and copper, so as to realize copper recovery; in the replacement reaction, the copper-cyanogen complex in the filtrate is converted into a zinc-cyanogen complex with a lower stability constant, and then the zinc in the filtrate is recycled by diaphragm electrolysis. The method specifically comprises the following steps: dividing an electrolytic cell into a cathode region and an anode region by utilizing a membrane material, and enabling electrode reactions to be independently carried out, so that cyanide is prevented from entering the anode region to generate electrochemical oxidation and the decomposition of the cyanide is inhibited, and the cyanide is recycled in a solution for cyclic utilization; and then an alkali-resistant titanium-based coating electrode is used as an anode plate, a porous material is used as a cathode plate, recovery of zinc on the cathode plate is promoted, and recovery of valuable metal zinc and copper and cyclic utilization of cyanide are achieved.

The invention relates to the technical field of titration detection in analytical chemistry, in particular to a thymol phenolphthalein-TBPE composite indicated cyanide high-precision detection method which comprises the following steps: step 1, after a water sample to be detected is distilled and separated, adjusting the pH value of distillate to a strong alkaline environment required by thymol phenolphthalein color development; 2, adding a composite indicator containing thymol phenolphthalein and tetrabromo phenolphthalein ethyl ester, wherein the mass ratio of the two components in the composite indicator is determined through a color change sensitivity optimization experiment; step 3, titrating with a silver nitrate solution, and judging an end point according to three-order color mutation: the initial state is light yellow, the intermediate state is green, and the end point state is purple red; and 4, adding an auxiliary masking agent before titration, and blocking the reaction between the auxiliary masking agent and silver ions by preferentially complexing interference ions. By optimizing the ratio of the composite indicator and using the masking agent, interference of other substances can be effectively prevented, and accurate detection of cyanide is ensured.

A process for operating an oxidizable combustion gas cleaning unit in a metallurgical plant, including the steps of: (a) passing an oxidizable combustion gas from a metallurgical reactor, in particular a blast furnace gas from a blast furnace, in a packed bed scrubber arrangement through a packed bed in countercurrent with a washing water or in a spray scrubber arrangement to remove cyanide compounds, in particular hydrogen cyanide, and to increase the removal of chloride compounds, in particular hydrogen chloride, from the combustion gas by solubilizing the cyanide and chloride compounds in the washing water, (b) collecting the washing water containing solubilized cyanide and chloride compounds at a bottom end of the packed bed or spray scrubber arrangement, and (c) collecting a cleaned oxidizable combustion gas at a top of the packed bed or spray scrubber arrangement, wherein a base is added to the washing water before step (a).

The present application discloses a method for treating and resourcefully recycling electroplating cyanide copper wastewater, belonging to the technical field of electroplating wastewater treatment. In this application, the cyanide copper wastewater is adjusted with strong base, and a ferrous sulfate solution is added to the cyanide copper wastewater after strong base adjustment for a combination reaction; the cyanide copper wastewater after the combination reaction is adjusted with acid and subjected to a Prussian blue reaction; a coagulant aid is added to the solution after the Prussian blue reaction, and solid-liquid filtration separation is carried out on it to obtain iron cyanide sludge and preliminarily precipitated cyanide-removing wastewater; the preliminarily precipitated cyanide-removing wastewater is adjusted with weak base, hydrogen peroxide is added to the preliminarily precipitated cyanide-removing wastewater after weak base adjustment, and the copper in the preliminarily precipitated cyanide-removing wastewater after weak base adjustment is used as a catalyst for an oxidation reaction to remove the remaining cyanide-containing pollutants; after the oxidation reaction is completed, lime is added for flocculation precipitation to obtain copper sludge, thus realizing a one-step process flow, converting copper cyanide compounds into resources that can be recycled, and improving the resource utilization rate.

The invention relates to the technical field of chemical intermediates, and particularly discloses a preparation method of a givelastat intermediate.According to the preparation method, an initiator compound 5 can be synthesized by adopting cheap 2-hydroxy-6-naphthoic acid (CAS: 16712-64-4, 141 yuan / kg), and the preparation method is different from a method in the prior art. A gemvelastat intermediate compound 4 is synthesized from a compound 5 through a three-step reaction, compared with the prior art, the yield is high, industrial amplification production is more facilitated, in the process of synthesizing a compound 6 from the compound 5, acetonitrile can be adopted as a cyanide source in a reaction system, activated hydroxyl is subjected to a coupling reaction, and the yield is high. In the process of synthesizing a compound 6 from a compound 7 instead of a traditional metal cyanide, or in the process of synthesizing a compound 6 from another compound 5, a cheap cuprous cyanide and cuprous iodide system is adopted for a coupling reaction, and in the process of synthesizing a compound 4 from a compound 7, an acetic acid and sodium triacetoxyborohydride reaction system is adopted, so that the compound 6 is synthesized. And the important intermediate of the givelastat can be obtained with high yield.

To provide a thermoplastic resin composition from which a resin molded article excellent in moldability, impact resistance, rigidity, weather resistance and adhesion of a deoxime type silicone-based sealing material cured product is given.SOLUTION: A thermoplastic resin composition contains a graft copolymer obtained by polymerization of a vinyl monomer containing an aromatic vinyl compound and a vinyl cyanide compound in the presence of a rubbery polymer, a vinyl-based copolymer which contains a unit derived from an aromatic vinyl compound and a unit derived from a vinyl cyanide compound, and contains no unit of formula (1), and a modified vinyl-based copolymer containing a unit derived from an aromatic vinyl compound, a unit derived from a vinyl cyanide compound, and a unit of Formula (1), and when the total of the units is 100 mass%, a content ratio of the rubbery polymer is 5 to 25 mass%, and a content ratio of the unit of Formula (1) in the modified vinyl-based copolymer is 1 to 20 mass%.SELECTED DRAWING: None

The utility model belongs to the technical field of sewage treatment, and particularly relates to a carbon fiber production wastewater treatment device. Comprising a plate heat exchanger, a polymer sedimentation tank, an air flotation machine, a hydrolysis acidification tank, an anoxic tank, an aerobic tank and a secondary sedimentation tank which are sequentially connected, an inlet of the plate heat exchanger is connected with a carbon fiber production device, and an outlet of the secondary sedimentation tank is connected to a sewage treatment plant; the system further comprises a decyanation pool, an inlet of the decyanation pool is connected with the high-concentration cyano compound wastewater collecting tank, and an outlet of the decyanation pool is connected to the hydrolysis acidification pool; an inlet of the neutralization tank is connected with the acrylic acid production device, and an outlet of the neutralization tank is connected to the hydrolysis acidification tank. By using the acrylic acid production wastewater as the composite carbon source and recovering the dry powder, the outsourcing cost of the carbon source and the sludge treatment cost are remarkably reduced; by combining the synergistic effect of physical pretreatment, chemical decyanation and biodegradation processes, cyanides, suspended solids and organic pollutants are efficiently removed, and it is ensured that the effluent index stably reaches the standard.

The invention provides an up-to-standard treatment method for wastewater containing ammonia nitrogen and difficult-to-treat copper-cyanogen, and belongs to the field of wastewater treatment.The wastewater enters a first-stage oxidation reactor at first, the stable structure of a copper-cyanogen complex is destroyed by adding an oxidizing agent, then a copper removal agent and a pH adjusting agent are added into a copper removal reactor, copper ions are precipitated and separated out, and then the wastewater enters a second-stage oxidation reactor; the method comprises the following steps: carrying out oxidation and solid-liquid separation to remove copper sludge, carrying out oxidation and solid-liquid separation on treated overflow liquid and press filtrate after convergence so as to thoroughly remove residual cyanide and organic matters, and finally, conveying purified liquid which is subjected to two-stage oxidation and is subjected to copper cyanide interference removal to a biological reaction system to carry out biochemical reaction. And finally, the effluent reaches the recycling or discharging standard. The method effectively solves the problem of toxicity inhibition of difficult-to-treat wastewater on a biochemical system, realizes step-by-step removal and resource utilization of toxic and harmful substances, ensures stable and up-to-standard reuse or discharge of effluent, and has the advantages of efficient treatment, economy, environmental protection and convenient operation.

The invention provides an induced electric field-based polar plate electroplating and etching method, which comprises the following steps of: respectively placing two substrates on two sides of an electroplating tank, and respectively connecting the two substrates with a positive electrode and a negative electrode of a power supply; placing a plating piece serving as a bipolar plate in the electroplating tank, and dividing the electroplating tank into a plurality of independent areas; electroplating liquid is injected into the independent areas respectively, and a power supply is turned on, so that the two sides of the bipolar plate generate different potential fields in an induction mode respectively; after the preset electroplating time, the bipolar plate is taken down to obtain a final plated part, the technical bottleneck that a traditional electroplating process can only be used for single-face machining and single plating layer is overcome, the bipolar plate is used for separating an electrolytic bath and applying a directional electric field, electroplating or etching of differentiated materials is synchronously achieved on the two sides of the plated part, the production efficiency is remarkably improved, the equipment cost is reduced, and meanwhile, the production cost is reduced. A water-based metal salt solution is adopted to replace a traditional cyanide system, environmental pollution is reduced, and the green manufacturing requirement is met.

The invention relates to a coal chemical industry wastewater anaerobic detoxification method, and belongs to the technical field of coal chemical industry wastewater anaerobic detoxification. The method comprises the following steps: pre-treating and regulating the oxidation-reduction potential of the wastewater to-80mV to-50mV; inoculating the polyurethane foam carrier with a mixed flora of thiocyanogen degrading bacteria and phenol hydrolytic bacteria to form a layered biological membrane; the oxidation-reduction potential is controlled in stages, and sodium formate is added under the micro-aerobic condition to preferentially degrade thiocyanate radicals to generate bicarbonate radicals; nano zero-valent iron is added to reduce catechol and adsorb cyanide; and adding ethanol and humic acid under a strict anaerobic condition to degrade phenols. Through flora metabolism path decoupling, metabolite synergy and nanometer material directional detoxification, the problems of equipment redundancy, flora competitive inhibition and intermediate product toxicity accumulation of a traditional multi-stage reactor are solved, efficient step-by-step degradation of thiocyanide and phenols is achieved in a single reactor, the biodegradability of wastewater is remarkably improved, and the method is suitable for industrial production. And a low-toxicity environment is provided for subsequent treatment.

The invention provides a non-ferrous metal recovery method and an aluminum electrolyte carbon residue comprehensive utilization process, and relates to the technical field of metal recovery and utilization. A non-ferrous metal recycling method comprises the following steps that S1, pretreatment of raw materials is conducted, specifically, aluminum electrolyte is crushed and screened through a crusher to prepare carbon residue powder, the carbon residue powder and an alkaline compound are mixed according to the mass ratio and then put into a muffle furnace to be roasted, fluoride is converted into calcium fluoride, cyanide is converted into calcium cyanate, and roasted residues are generated; and S2, leaching treatment is conducted, specifically, the roasting slag in the step S1 is put into a constant-temperature water bath pot through a sulfuric acid solution to be leached. According to the scheme, enrichment of valuable metals such as aluminum and lithium can be finally achieved by leaching the roasting slag through sulfuric acid, impurities such as iron and aluminum are accurately separated from the leachate through a fractional precipitation method, calcium ions are selectively precipitated through oxalic acid, a high-purity lithium solution is finally obtained, a battery-grade lithium carbonate product is prepared after lithium precipitation, effective recovery and utilization of non-ferrous metals are achieved, and the method is suitable for industrial production. The energy is saved.

To provide a method for producing a urethane bond-containing polyether compound having excellent curability.SOLUTION: A method for producing a polyether compound having a urethane bond, comprising contacting an initiator having an active hydrogen with an alkylene oxide-containing starting material in the presence of a double metal cyanide complex catalyst to polymerize the alkylene oxide in the alkylene oxide-containing starting material into the initiator, and reacting the resulting polyether compound having a hydroxyl group with a polyisocyanate, wherein the polyether compound has an acid value of 0.001 to 0.008 mg / g.SELECTED DRAWING: None

The invention relates to the technical field of environmental catalysis and pollution treatment, in particular to a chelated iron desulfurizer. According to the desulfurizer, DOTA is used as a core chelating agent, an iron active center is accurately anchored to a shell layer of a polymer core-shell structure microsphere through a multi-step polymerization and functionalization process, and the design of solution-state complexing iron is assisted, so that the desulfurizer has both solid-phase localization and solution compensation, the capability of resisting poisoning of impurities such as cyanide and mercaptan is remarkably improved, and iron loss is reduced. The desulfurizer is high in desulfurization efficiency and large in sulfur capacity, can stably operate for a long period, shows excellent continuous activity and selectivity under the conditions of coexistence of various impurities and repeated regeneration, and has a good application prospect.

The present invention relates to a process for producing a nitrile compound by chain extension of an alkyleneamine compound containing three or more amine units, wherein at least two amine units are protected by cyclic urea units and at least one amine unit is unprotected, by reacting the at least one unprotected amine unit with glycolonitrile or with a combination of formaldehyde and a cyanide selected from HCN and inorganic cyanide salts to add at least one acetonitrile group to the at least one unprotected amine unit. The process according to the invention allows the production of nitrile compounds with high selectivity and high yield. The nitrile compounds can be processed as required.

The invention provides a process for preparing cement from aluminum electrolysis overhaul residues and waste anti-seepage material lithium extraction residues, and relates to the technical field of solid waste co-treatment and resource utilization, and the process comprises the following steps: mixing pretreatment: crushing and grinding mixed raw materials, adding a calcium-based fluorine fixing agent, and roasting to decompose cyanide and stabilize fluoride; preparing a cement raw material: mixing the mixed residues with other raw materials according to a certain ratio, adjusting the ratio value, and grinding to prepare the cement raw material; calcining the clinker, namely calcining the raw material at high temperature, treating flue gas, and quickly cooling to obtain the cement clinker; according to the invention, a carbonaceous material in the overhaul slag is utilized to provide part of heat, so that the energy consumption is reduced; fluorides in the two wastes react with each other to generate a more stable compound, so that the fluorine curing efficiency is improved, and the environmental risk is thoroughly eliminated; heavy metal is further solidified in a cement kiln high-temperature environment, harmless treatment is achieved, the resource utilization rate is increased, and product performance is reliable.

To provide a method for synthesizing a cyanide that is a precursor to a β-amino acid derivative having bulky optical activity, intended for peptide synthesis including a β-amino acid having bulky optical activity.SOLUTION: The present invention provides a method for synthesizing a cyanation product having a bulky tertiary alkylated structure and having optical activity, by reacting an α-haloamide having a bulky tertiary alkylated structure and having optical activity with a cyanohydrin in the presence of a copper catalyst.SELECTED DRAWING: None

The present invention relates to a thermoplastic resin composition including: a base resin including a diene-based graft polymer and a vinyl-based non-grafted polymer including an aromatic vinyl-based monomer unit and a vinyl cyanide-based monomer unit; and an additive including an olefin-based non-grafted polymer including an olefin-based monomer unit, a (meth)acrylate-based monomer unit, and a maleic acid-based monomer unit.

To provide a method for producing a polyether compound having a urethane bond, capable of improving filterability in a purification process.SOLUTION: The method for producing a polyether compound having a urethane bond comprises polymerizing an initiator having an active hydrogen and an alkylene oxide in the presence of a double metal cyanide complex catalyst and reacting a composition containing the obtained polyether compound having a hydroxy group with a polyisocyanate. The double metal cyanide complex catalyst is in the form of particles, the double metal cyanide complex catalyst has a 50% cumulative volume particle size of from 0.01 to 4.0 μm as determined from a volume-based cumulative particle size distribution obtained by a laser diffraction scattering method, and the content of the particles having a particle size of at least 11 μm is at most 10 vol% based on the total volume of the double metal cyanide complex catalyst.SELECTED DRAWING: None

The application belongs to the field of chemical industry, and particularly relates to a preparation method of N,N,N',N'-tetramethyl diacrylamine, which comprises the following steps: hydrogenation reaction is carried out by introducing hydrogen into an amine group propyl cyanide compound, a dimethylamine aqueous solution and a catalyst; under the protection of inert gas, solid-liquid separation (filtration) is carried out on the obtained hydrogenated material, so that a filtrate and a filter cake are obtained; and the filtrate is subjected to rectification, so that N,N,N',N'-tetramethyl diacrylamine (2(DMAP)A) is obtained. The application has the advantages of simple process, mild conditions, green environmental protection, high product yield and facilitation of industrial production.

Provided is a method for producing a polyoxypropylene polymer with which it is possible to achieve a high average molecular weight in a short polymerization time. This method is a method for producing a polyoxypropylene polymer having a number average molecular weight of 30,000-70,000 (inclusive). The polymerization is carried out by additionally oxidizing propylene over time in a reaction system comprising a hydroxyl group-containing initiator and a composite metal cyanide complex catalyst. The polymerization temperature is set to 120-160 DEG C, the moisture content in the propylene oxide is 200 ppm or less, and the ratio (X / Y) of the designed molecular weight (X) to the time (Y) (minute) required to add the propylene oxide is 95-130.

The present invention relates to a method for anaerobic detoxification of coal chemical wastewater, and belongs to the technical field of anaerobic detoxification of coal chemical wastewater. The method comprises pre-treatment to regulate the redox potential of the wastewater to a range of 80mV to 50mV; inoculating a mixed bacterial community of thiocyanate-degrading bacteria and phenol-hydrolyzing bacteria on a polyurethane foam carrier to form a layered biofilm; controlling the redox potential in stages, adding sodium formate under microaerobic conditions to preferentially degrade thiocyanate to produce bicarbonate; adding nano-zero-valent iron to reduce catechol and adsorb cyanide; and adding ethanol and humic acid under strictly anaerobic conditions to degrade phenols. Through the decoupling of bacterial metabolic pathways, the synergistic detoxification of metabolites and the targeted detoxification of nanomaterials, the problems of redundancy of traditional multi-stage reactor equipment, bacterial competitive inhibition and toxic accumulation of intermediate products are solved, and efficient step-by-step degradation of thiocyanate and phenols is achieved in a single reactor, the biodegradability of the wastewater is significantly improved, and a low-toxic environment is provided for subsequent treatment.

A thermoplastic resin composition including an alkyl (meth)acrylate-aromatic vinyl compound-vinyl cyanide compound graft copolymer (A) including a polymer seed including 70 to 85% by weight of an alkyl (meth)acrylate and 15 to 30% by weight of an aromatic vinyl compound, a rubber core surrounding the polymer seed and including 78 to 90% by weight of an alkyl acrylate and 10 to 22% by weight of an aromatic vinyl compound, and a graft shell surrounding the rubber core and including 65 to 80% by weight of an aromatic vinyl compound, 14 to 25% by weight of a vinyl cyanide compound, and 3 to 15% by weight of an alkyl (meth)acrylate; and a non-graft copolymer (B) including an alkyl (meth)acrylate, an aromatic vinyl compound, and a vinyl cyanide compound. The present disclosure also relates to a preparation method and a molded article.

A method for the iron-catalyzed photoinduced preparation of cyano-inner unsaturated derivatives. The present invention belongs to the field of the synthesis of organic unsaturated bond compounds, and particularly relates to a method for the synthesis of cyano-inner unsaturated derivatives. The present invention aims to solve the technical problem that the current synthesis of cyano-unsaturated compounds uses dangerous inorganic or organic small molecule cyanides as raw materials, resulting in poor preparation safety. Method: Using an iron salt as a catalyst, an unsaturated sulfone reagent and a cyclic oxime acid compound as raw materials, potassium hydroxide as a base, in a toluene solvent, the reaction temperature is 30 °C, and it is placed under a 10W purple LED for photoinduced reaction to obtain the cyano-inner unsaturated compound. The catalyst involved in the synthesis method of the present invention is simple and easily available, the raw materials are green and non-toxic, the functional group compatibility is good, the reaction conditions are mild, and it has good industrial application prospects. The present invention is used for the preparation of cyano-inner unsaturated derivatives.

The invention provides an environment-friendly gold beneficiation aid and a preparation method thereof. The aid comprises 30-60 parts of a modified thiosulfate complexing component, 15-30 parts of a catalytic stable oxidation component, 8-20 parts of an interface functional component, 10-25 parts of a buffer component and 5-15 parts of a permeation aid. The preparation method comprises the following steps: performing high-shear mixing on the raw materials to obtain a homogeneous mixture; curing and stabilizing the homogeneous mixture to obtain a cured material; and carrying out air jet pulverization on the cured material until D90 is 20-40 microns, so as to obtain the additive product. According to the additive, by innovatively compounding a modified thiosulfate complexing component and a catalytic oxidation system, cyanide pollution is completely eradicated while efficient leaching of gold is achieved, and the additive has the advantages of environmental protection breakthrough and leaching efficiency.

The invention discloses a cyanide-containing waste slag and biomass calcination soil transformation equipment, which comprises a crushing and mixing mechanism, a spiral feeding trough, a calcination mechanism, a batching mechanism, a cooling water circulation device, a tail gas absorption device, and a compounding liquid preparation tank; when the device is used, the cyanide-containing waste slag and biomass are subjected to six steps of crushing and mixing, preheating, spraying additives, calcining, cooling, and compounding to form nutrient soil, and the cyanide contained in the raw materials is removed after medium-temperature / high-temperature calcination, while reducing the content of heavy metals and other toxic substances in the cyanide-containing waste slag; the modified additives and the nutrient soil compounding agent are uniformly mixed on the materials in the transmission process through a spraying device added in the middle of the channel; the temperature of the calcined materials is reduced by a cooling water circulation system, and the materials can be used in the temperature treatment process of the preheating room materials after the temperature treatment; the prepared nutrient soil contains a large number of microorganisms and nutrient elements suitable for crop growth, and the harmless treatment of the cyanide-containing waste slag is achieved while expanding the utilization of industrial solid waste in the soil.

The present invention pertains to a double metal cyanide complex catalyst having a moisture content of 8,000 to 140,000 ppm as determined by the Karl Fischer method, and having diffraction peaks at 2θ=36° and 2θ=47°, but no diffraction peak at 2θ=34°, in an X-ray diffraction pattern.

A method of preparing a thermoplastic resin including kneading and extruding an alkyl acrylate-aromatic vinyl compound-vinyl cyanide compound graft copolymer (A), or an alkyl acrylate-aromatic vinyl compound-vinyl cyanide compound graft copolymer (A) and a matrix resin (B) including one or more selected from the group consisting of an aromatic vinyl compound, a vinyl cyanide compound, an alkyl methacrylate, and an alkyl acrylate. A total content of the alkyl acrylate included in the thermoplastic resin is 20 to 50% by weight. An alkyl acrylate coverage value (X) of the thermoplastic resin as calculated by Equation 1 (X={(G−Y) / Y}×100) is 65 or more. In Equation 1, G represents a total gel content (%) of the thermoplastic resin, and Y represents a content (% by weight) of the alkyl acrylate in the gel of the thermoplastic resin.

The application discloses a preparation method and application of a composite catalyst for preparing carbon dioxide-based polycarbonate polyols, and belongs to the technical field of catalysts. The composite catalyst is prepared by compounding a double metal cyanide catalyst and a zinc gallate catalyst in a certain proportion. In the presence of a chain transfer agent, the two kinds of catalysts produce a synergistic effect in a polymerization process: the double metal cyanide catalyst serves as a main active center, initiates and promotes chain growth; and the zinc gallate catalyst serves as a selective regulation center, promotes carbon dioxide insertion and inhibits side reactions, so that the catalysts have high activity and high selectivity. The polycarbonate polyols prepared by using the composite catalyst have high carbon dioxide insertion rates and low number average molecular weights. Moreover, the composite catalyst has simple preparation process, is wide in raw material and low in cost, and is suitable for industrialized scale preparation.

Disclosed is a thermoplastic resin composition, a method of preparing the same, and a molded article including the same. Also disclosed is a thermoplastic resin composition prepared by adding a recycled vinyl cyanide compound-conjugated diene rubber-aromatic vinyl compound copolymer and a recycled polycarbonate resin to a composition including a vinyl cyanide compound-conjugated diene rubber-aromatic vinyl compound graft copolymer, an α-methyl styrene-vinyl cyanide compound-aromatic vinyl compound copolymer, and an aromatic vinyl compound-vinyl cyanide compound copolymer according to a predetermined composition ratio.