251 results about "Carbon Chloride" patented technology

Disclosed herein is a method for economically manufacturing high quality TiC powder, TiCN powder or ultrafine nanophase TiC+Ni (Co, Al) and TiCN+Ni (Co, Al) composite powders by means of metallothermic reduction. The method comprises the steps of preparing a starting solution of titanium tetrachloride (TiCl4) in a carbon chloride, feeding the starting solution into a closed container containing molten magnesium (Mg) under inert atmosphere, vacuum-separating unreacted liquid-phase Mg and magnesium chloride (MgCl2) remaining after reduction of magnesium from the closed container, and collecting a TiC compound from the closed container. TiC powder, TiCN powder or ultrafine nanophase TiC+Ni (Co, Al) and TiCN+Ni (Co, Al) composite powders having a particle size of a few tens nm can be manufactured in a simpler manner using economically advantageous starting materials such as titanium tetrachloride and carbon chlorides.

A method of producing a chlorinated hydrocarbon having 3 carbon atoms, comprising a conversion step for converting a chloropropane represented by the following formula (1) into a chloropropane represented by the following formula (2) by reacting it with chlorine in the presence of anhydrous aluminum chloride.CCl3—CCl(2-m)Hm—CCl(3-n)Hn  (1)(In the above formula (1), m is 1 or 2, and n is an integer of 0 to 3.)CCl3—CCl(3-m)H(m-1)—CCl(3-n)Hn  (2)(In the above formula (2), m and n are the same integers as in the formula (1), respectively.)

The invention discloses a photocatalytic cellular activated carbon net. A cellular activated carbon net is used as a carrier; Co, Pr, S and TiO2 in mole ratio of (0.01-0.03): (0.005-0.015): (0.5-2.0): (0.9-1.2) are loaded on the cellular activated carbon net. According to the photocatalytic cellular activated carbon net, the function of adsorbing organic pollutants by activated carbon is kept and the capability of degrading organic pollutants through response to visible light by catalyst is provided. The photocatalytic cellular activated carbon net has a straight-hole net structure and is good in air permeability and light permeability; the specific surface area is 750-1050 m<2> / g; the iodine sorption value is 900-1100 mg / g; the carbon tetrachloride adsorption rate is 40-60%. In a 30 cm<3> enclosed space, visible light is used as a light source; after 50 min, the formaldehyde removal rate is 95.6-98.7%, the methylbenzene removal rate is 90.3-93.6% and the ammonia removal rate is 92.8-96.0%.

A refining process of hydrogen chloride comprises the following steps: allowing coarse hydrogen chloride to pass a sulfuric acid drying system for drying so as to remove moisture at room temperature; allowing the coarse hydrogen chloride to pass a three-stage compression and condensation separation system so as to enable the coarse hydrogen chloride to be compressed for three times, performing condensation, performing liquification separation to separate out part of impurities, allowing the coarse hydrogen chloride to pass a rectification system to enable high-purity hydrogen chloride to be extracted out by a vapor phase at the top of a tower, allowing the high-purity hydrogen chloride to pass a condenser for condensation and then to enter a backflow tank, and conveying hydrogen chloride gas which is positioned at the top of the backflow tank and subjected to pressure regulation to a user; heating a tower kettle of a float valve tower through low pressure steam, and extracting out chlorine and carbon tetrachloride according to a liquid phase of the liquid level. According to the process, purification of hydrogen chloride containing impurities such as chlorine and organic materials is realized, and the chlorine and the carbon tetrachloride can be separated out and extracted out; after the completion of the first stage compression and the second stage compression, condensation and separation are performed to remove the organic materials in advance so as to ensure long-term stable operation of a compressor; the high-purity hydrogen chloride can be obtained, industrial three wastes can not be produced, and energy saving and environmental protection are realized.

The invention discloses a synthesis method of functional feed additive butyric acid mono-and di-glyceride, comprising the following steps: heating and reflowing glycerol and n-butyric acid in the presence of phosphoric acid serving as a catalyst and carbon tetrachloride serving as a water-carrying agent; stopping reacting until the amount of the water in a water knockout drum is almost constant; distilling out the carbon tetrachloride to prepare a crude product; rinsing the obtained crude product by utilizing a saturated salt solution with the pH of 10 for many times so as to remove the reactant and catalyst which do no react; and separating and purifying until the low-layer aqueous phase is alkaline, thus obtaining the butyric acid mono-and di-glyceride. The method is simple and easy to control, and has the advantages that the reaction condition is safe and moderate, separation and purification can be carried out easily, and the steps are less.

The invention discloses an infrared photometric method for quickly measuring oils in water without using chlorofluorocarbon reagents, belonging to the field of infrared spectroscopy. The method comprises the following steps: (1) collecting a sample, controlling the pH to 3-3.5, and adding and analyzing pure iron powder and ferrous chloride solution; (2) extracting oils in water through carbon disulfide, and drying the oil through anhydrous calcium chloride; (3) measuring the extract liquor through a CaF2 window film cuvette; (4) measuring infrared absorption of the extract liquor through a Fourier infrared spectrum tester to determine the mass-volume concentration of total oils; (5) measuring the infrared absorption of the extract liquor at 1750-1735cm<-1> to determine the mol concentration of vegetable oil, and calculating the mass-volume concentration of the vegetable oil; and (6) subtracting the mass-volume concentration of the vegetable oil from the mass-volume concentration of total oils to obtain the mass-volume concentration of petroleum. The method can be used for quickly measuring oils in water after the chlorofluorocarbon reagents are forbidden.

The invention relates to a HCl recovery technique which comprises the following steps: pressurized HCl gas enters a HCl rectification tower with a heated tower bottom through a buffer tank; the gas HCl is recovered at the cooled tower top; chlorine gas and carbon tetrachloride at the bottom of the rectification tower are depressurized and heated and enters a flash tank to perform flash evaporation; and the chlorine gas is recovered at the top of the flash tank, and the carbon tetrachloride is recovered at the bottom. Compared with the original HCl absorption-desorption technique, the HCl pressurized rectification production technique provided by the invention saves the equipment investment and maintenance, lowers the energy consumption, and ensures the purity of the HCl gas.

A liquid phase process is disclosed for producing halogenated alkane adducts of the formula CAR1R2CBR3R4 (where A, B, R1, R2, R3, and R4 are as defined in the specification) which involves contacting a corresponding halogenated alkane, AB, with a corresponding olefin, CR1R2═CR3R4 in a dinitrile or cyclic carbonate ester solvent which divides the reaction mixture into two liquid phases and in the presence of a catalyst system containing (i) at least one catalyst selected from monovalent and divalent copper; and optionally (ii) a promoter selected from aromatic or aliphatic heterocyclic compounds which contain at least one carbon-nitrogen double bond in the heterocyclic ring. When hydrochlorofluorocarbons are formed, the chlorine content may be reduced by reacting the hydrochlorofluorocarbons with HF.New compounds disclosed include CF3CF2CCl2CH2CCl3, CF3CCl2CH2CH2Cl and CF3CCl2CH2CHClF. These compounds are useful as intermediates for producing hydrofluorocarbons.Azeotropes of CClF2CH2CF3 with HF and azeotropes of CF3CH2CHF2 with HF are also disclosed; as are process for producing such azeotropes.A process for purification of certain hydrofluorocarbons and / or chloro-precursors thereof from mixtures of such compounds with HF is also disclosed.

The invention belongs to the technical field of a battery and especially relates to a Karl-Fischer reagent for electrolyte moisture detection and a preparation method thereof. The Karl-Fischer reagent comprises the following components by weight percent: 1-8% of iodine, 1-8% of sulfur dioxide, 2-10% of carbon tetrachloride, 10-30% of aniline, 10-30% of aniline hydriodate and 40-70% of hydroxyl-free alcohol ether compound. Compared with the present Karl-Fischer reagent containing methyl alcohol, 2-methoxyethanol, and the like, the Karl-Fischer reagent provided by the invention contains no hydroxyl compound, so that the Karl-Fischer reagent can be effectively prevented from having esterification reaction with a boracic additive in the electrolyte and further influencing the determination for trace water in electrolyte, and the detection accuracy can be guaranteed. Besides, the Karl-Fischer reagent provided by the invention contains no toxic or environmental pollution components, such as methyl alcohol and pyridine, so that the Karl-Fischer reagent is more safe and environment-friendly.

The invention discloses a preparation method of arbidol hydrochloride. The preparation method comprises the following steps of: (1) performing hydroxylation reaction on 3-iodo-4-nitrophenol serving as a raw material by using acetyl chloride to obtain a compound I; (2) performing substitution reaction on the compound I and ethyl acetoacetate under the action of alkali to obtain a compound II; (3) performing reduction-condensation concerted reaction on the compound II under the conditions of acetic acid and iron powder to synthesize an indole ring, and obtaining a compound III; (4) performing N-methylation reaction on the compound III by using dimethyl sulfate to obtain a compound IV; (5) performing di-bromination reaction on the compound IV in carbon tetrachloride by using bromine to obtain a compound V; (6) reacting the compound V and thiophenol under the alkali condition, and obtaining a compound VI after acidifying; (7) preparing a compound VII from the compound VI in the presence of a reaction solvent, namely aqueous solution of dimethylamine and formaldehyde; and (8) acidifying the compound VII in hot acetone to obtain the arbidol hydrochloride. The preparation method is facile in raw materials, mild in reaction conditions, high in yield, easy in separation and purification, low in cost and suitable for industrialized production.

It is a kind of method used to make nanophase pipe of amorphous carbon. It dissolves 1mmol of dicyclopentadienyl iron in 20-50ml of carbon tetrachloride and mix them evenly, move the mixture into the stainless steel autoclave underlayed by polytetrafluoroethylene, then improve the temperature to 120-180deg.C and make them into isothermal reaction for 12-72 hours. After the isothermal reaction, scrub black outcome got after filtrating using distilled water and ethanol for 3 times in turn, dry it for 10 hours at 80deg.C in vacuum, then get the nanophase pipe of amorphous carbon. The producing rate of making nanophase pipe of amorphous carbon exceeds 90%, energy dissipation is low with high efficiency, it needn't append activator, the method is simple and easy to operate, the raw material is easy to get, the scale is easy to enlarge, and it is suitable for multitudinous production of serialization.

The invention relates to the field of activated charcoal preparation and particularly relates to hemp-stalk activated charcoal and a preparation method thereof. The method comprises the following steps: (a) kneading and aging: thoroughly mixing hemp stalks and an activator in a kneader, and aging hemp stalk fibers, so as to obtain a mixture, wherein the activator is phosphoric acid; (b) granulating: carrying out extrusion granulation on the mixture obtained in the step (a), so as to obtain a granular material; (c) shaping: shaping the granular material obtained in the step (b) by using a shaping furnace; (d) activating: activating the shaped granular material obtained in the step (c) by using an activation furnace; (e) rinsing and drying, thus obtaining the hemp-stalk activated charcoal. According to the method disclosed by the invention, the phosphoric acid is adopted as the activator and can be partially recovered in an aftertreatment rinsing process, so that the production cost is reduced; the prepared hemp-stalk activated charcoal has the iodine adsorption value of 800-1,100mg / g and the carbon tetrachloride adsorption value of 100-120%.

The invention discloses an insulation stretch resistant coating, a preparation method and an application thereof. The coating comprises the following components of 15-35 parts of a polyester resin A, 5-25 parts of a polyester resin B, 3.5-5 parts of an amino resin, 0-0.5 part of an adhesion promoter, 0.1-0.2 part of a slip additive, 2.5-4 parts of a surface modification agent, 0.1-0.2 part of an antifoaming agent, 0.1-0.2 part of a flatting agent and 50-55 parts of an organic solvent. The method firstly mixing the polyester resin A, the polyester resin B, the amino resin and the organic solvent, and then adding and evenly mixing the adhesion promoter, the surface modification agent, the slip additive, a catalyst, the antifoaming agent and the flatting agent to obtain the insulation stretch resistant coating. The insulation stretch resistant coating is free from yellowing after the coating is roasted for 3 minutes at the temperature of 270 DEG C and capable of resisting high voltage of 1050V; the appearance of a capacitor paint film which is formed by deep-draw is flawless; the paint film is free from dissolution after-tack when soaked in carbon tetrachloride for 2 hours; and the paint film at the position of a notch of the capacitor is free from peeling off and foaming when the capacitor is cooked at the temperature of 100 DEG C for 30 minutes. Accordingly, the coating is wide in application prospect in electronic products.

The invention provides an environment-friendly chlorcosane-70 manufacturing technique, and is characterized in that a chlorcosane-42 spray cooling absorption tower is added in photochemical chlorination reaction process, and tail gas generated from photochemical chlorination reaction is absorbed in cleaning treatment. Spraying, solvent emersion, washing, neutralization and granulation processes are finished at one time in a spray desorption solvent tower. The environment-friendly chlorcosane-70 manufacturing technique provided by the invention has the characteristics of simplified process, fewer material transport processes, high-efficient carbon tetrachloride solvent recycling, homogeneous grain diameter of chlorcosane-70 products, and the like.

The invention discloses a method for quantifying the mineral oil content in sulfur hexafluoride gas. The method defines the mineral oil content in sulfur hexafluoride as the mineral oil quantity in sulfur hexafluoride gas, namely, the method is used for measuring and detecting the quantity increase of a filter membrane after the filter membrane filters sulfur hexafluoride gas with a certain volume. The quantitative method comprises the following steps: a mineral oil carbon tetrachloride solution with certain concentration is sprayed on the surfaces of a plurality of filter membranes; the filter membranes are constant in weight after the solution fully volatilizes; the absorbancy of the filter membranes is measured on an infrared spectrophotometer; a relationship and quantification curve of the absorbancy and the quantity increase is drawn to achieve quantification analysis. The method for quantifying the mineral oil content in sulfur hexafluoride gas provided by the invention solves the difficulty that a parallel text has big errors because a mineral oil standard solution prepared in the conventional mineral oil content detecting process is easy to volatilize, and has the characteristic that the method is accurate in quantification, easy and convenient to operate, high in stability, and the like.

The invention discloses a solubilized viscosity-reducing agent composed of constituents with weight percent as: 7-15% dithizone solution, 9-13% carbon tetrachloride, 7-11% hydrogen peroxide, 13-15% xylene, 7-11% treated hydrochloride, and water. It has high permeability and speed to come to crude thick oil zone, combine minim water by inorganic solution, disperse gum bitumen and wax in crude oil, and also increase dissolution speed by 2-5 times. This invention is high efficient and fit to low temperature, and saves energy and cost.

The invention provides a crosslinked polystyrene adsorbent, and a preparation method and an application thereof. The crosslinked polystyrene adsorbent through a Friedel-Crafts alkylation reaction of 1-10 parts by weight of waste foam, 200-320 parts by weight of carbon tetrachloride and 10 parts by weight of anhydrous aluminum trichloride. The waste foam and carbon tetrachloride are used as raw materials, and undergo the Friedel-Crafts alkylation reaction under the catalysis action of anhydrous aluminum trichloride, and the carbon tetrachloride and the polystyrene linear molecules of the wastefoam are crosslinked to form a three-dimensional network structure, so the crosslinked polystyrene adsorbent has a high chlorine content and a strong Lewis base property, and can be strong chemicallyreacted with phenolic pollutants with Bronsted acidity in water, thereby the adsorbent has a high sewage dephenolization efficiency, and the dephenolization rate can reach 90% or above.

The present invention discloses an ultraviolet shielding type translucent thermal-insulation film preparation method, and belongs to the technical field of composite materials. According to the present invention, a nanometer LaB6 ethanol dispersion liquid and a PET resin reagent are used to prepare the ultraviolet shielding type translucent thermal-insulation film according to a volume ratio of 21:9-14, wherein the nanometer LaB6 ethanol dispersion liquid comprises dehydrated alcohol and a dispersing agent according to a volume ratio of 125:1.5-2, and LaB6 and zirconia balls according to a mass ratio of 1:100, preferably the nanometer LaB6 ethanol dispersion liquid comprises dehydrated alcohol and a dispersing agent according to a volume ratio of 125:-2, and LaB6 and zirconia balls according to a mass ratio of 1:100, and the PET resin reagent comprises phenol, carbon tetrachloride and a PET film according to a mass ratio of 16:16:1; and the LaB6 nanoparticles and the PET film are mixed to prepare the transparent, thermal insulation and ultraviolet absorption film sheet or the transparent thermal insulation coating, the film can be used in the fields of building energy-saving glasses and vehicle glasses, and further the preparation method is simple.

The invention relates to the technical field of environmental protection, in particular to an anti-pollution oil-water separation mesh film and a preparation method thereof. The oil-water separation mesh film is formed by coating meshes of a fabric mesh having 100-1800 meshes with one micron-sized organic high-molecular polymer coating film. A plurality of micron-sized mesh holes are reserved in the oil-water separation mesh film, and nanoscale bubbles are arranged on the organic high-molecular polymer coating film. The oil-water separation mesh film provided by the invention is large in water flux, rapid in oil-water separation speed and good in oil-water separation effect, is suitable for treating sewage with high oil content, and has good separation effects on heptane, edible oil, gasoline, n-hexane, carbon tetrachloride and the like; the oil-water separation mesh film is biocompatible, environment-friendly, easy to clean, reusable and good in stability.

The invention discloses a fire retardant containing a styrene structure and phosphorus and nitrogen elements. The fire retardant is obtained by reacting dialkyl phosphite with 4-aminostyrene and carbon tetrachloride in the presence of a catalyst, wherein the catalyst is a compound of an organic base and an inorganic base; the organic base catalyst is pyridine, triethylamine, diethylamine, triethanolamine, diethanolamine, aniline, tetrabutyl ammonium hydroxide or tetraethyl ammonium hydroxide, while the inorganic base catalyst is sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, sodium bicarbonate, potassium bicarbonate, sodium benzoate or potassium benzoate; the mol ratio of the organic base to 4-aminostyrene is (3-1): 1 and the mol ratio of the inorganic base to 4-aminostyrene is (1.1-1): 1. Due to the existence of the styrene structure in the molecule, the fire retardant monomer is easy to have a polymerization reaction with active double bonds such as styrene and ethylene; in the meantime, due to the existence of phosphorus and nitrogen fire-retarding elements, the material is provided with fire resistance; carbon tetrachloride is used as a solvent in the synthesis process, so that the reaction is convenient to operate and high in yield; industrial production of the fire retardant is easy to realize.

A process is disclosed for the manufacture of CF3CH2CHF2 and CF3CHFCH2F. The process involves (a) reacting hydrogen fluoride, chlorine, and at least one halopropene of the formula CX3CCl═CClX (where each X is independently F or Cl) to produce a product including both CF3CCl2CClF2 and CF3CClFCCl2F; (b) reacting CF3CCl2CClF2 and CF3CClFCCl2F produced in (a) with hydrogen to produce a product including both CF3CH2CHF2, and CF3CHFCH2F; and (c) recovering CF3CH2CHF2 and CF3CHFCH2F from the product produced in (b). In (a), the CF3CCl2CF3 and CF3CClFCClF2 are produced in the presence of a chlorofluorination catalyst including (i) a crystalline alpha-chromium oxide where at least 0.05 atom % of the chromium atoms in the alpha-chromium oxide lattice are replaced by divalent copper, and / or (ii) a chromium-containing composition of (i) which has been treated with a fluorinating agent.

Disclosed herein is a method for economically manufacturing high quality TiC powder, TiCN powder or ultrafine nanophase TiC+Ni (Co, Al) and TiCN+Ni (Co, Al) composite powders by means of metallothermic reduction. The method comprises the steps of preparing a starting solution of titanium tetrachloride (TiCl4) in a carbon chloride, feeding the starting solution into a closed container containing molten magnesium (Mg) under inert atmosphere, vacuum-separating unreacted liquid-phase Mg and magnesium chloride (MgCl2) remaining after reduction of magnesium from the closed container, and collecting a TiC compound from the closed container.TiC powder, TiCN powder or ultrafine nanophase TiC+Ni (Co, Al) and TiCN+Ni (Co, Al) composite powders having a particle size of a few tens nm can be manufactured in a simpler manner using economically advantageous starting materials such as titanium tetrachloride and carbon chlorides.

The invention belongs to the technical field of ethylene tetrachloride preparation and in particular relates to a method for converting carbon tetrachloride to ethylene tetrachloride. The method is characterized in that carbon tetrachloride is subjected to non-catalytic pyrolysis to generate ethylene tetrachloride in the presence of a hydrogen, oxygen and hydrogen chloride combined gas and excessive chlorine. The method has the beneficial effects that new carbon tetrachloride is not generated in the reaction; the heat released in the reaction between hydrogen and chlorine is used in conversion from carbon tetrachloride to ethylene tetrachloride; and the conversion rate is 94-95%.

De-chlorination for chloro-hydrocarbon in industrial waste water is carried out by taking cast-iron powder or ferric-carbon alloy as antichlor, putting antichlor into reactor containing chloro-hydrocarbon industrial waste water, regulating reactive mixture pH between 1-5, reacting fully above 3 hrs at normal temperature and pressure, entering reacted waste water into neutralization pool, adding into base while neutralizing, flocculating while depositing, anti-chlorinating and discharging. The chloro-hydrocarbon to be treated includes methylene chloride, chloroform, carbon tetrachloride, vinyl chloride, tri-chloroethylene, carbon dichloride, chloro-fatty hydrocarbon and chloro-aryl radical.

The invention discloses a preparation method for a vinyl benzyl trimethyl ammonium chloride-modified carbon fibre adsorbent. The preparation method comprises the following steps: first, performing an oxidation treatment on carbon fibres by adopting a mixed solution of concentrated hydrochloric acid and hydrogen peroxide; then, performing acylchlorination modification on the oxidized carbon fibres by adopting thionyl chloride; later on, adding 50 to 58 mass percent of water, 20 to 28 mass percent of vinyl benzyl trimethyl ammonium chloride, 18 to 24 mass percent of acylchlorinated carbon fibres and 1.0 to 2.0 mass percent of potassium permanganate into a reactor, wherein the sum of the percentage of various components is 100 percent; finally, keeping a constant temperature of 75+ / -2 DEG C, stirring, refluxing and reacting for 6 to 8 hours, cooling, washing with water until the filtrate is neutral, performing solid-liquid separation, and drying to obtain the vinyl benzyl trimethyl ammonium chloride-modified carbon fibre adsorbent. The absorbent has high stability, high adsorption capacity and high reuse frequency, and is low in cost and environment-friendly.

The invention relates to edible spice lenthionine. The lenthionine comprises the following raw materials in part by weight: 18 to 20 parts of sodium tetrathiocarbonate, 18 to 20 parts of diiodomethane, 140 to 160 parts of absolute ethyl alcohol and 90 parts of carbon tetrachloride. The lenthionine (also named 1,2,3,5,6-pentasulfide cycloheptane) prepared by the invention is widely applied to sauce products, meat products, convenient food and seasoning bouillon series, has pure, true and strong flavor, rich meat and good taste, can cover bad peculiar smell and resist to high temperature, is an ideal option for canned mushroom, mushroom sauce, the convenient food and seasoning and has a wide market prospect.

The invention provides a formula and a preparation method of a phosphate starch-vegetable gum copolymer film. The formula mainly comprises the following components: 15-20 parts of disodium hydrogen phosphate, 100-150 parts of corn starch, 100-120 parts of soybean protein, 5-7 parts of turpentine, 15-20 parts of 50% sodium hydroxide aqueous solution, 40-50 parts of lime water, 30-40 parts of sodium silicate, 2-5 parts of thiourea, 1-2 parts of carbon tetrachloride, 2-5 parts of pentachlorophenol and 200-220 parts of water. The target film product is obtained by carrying out mixing and adjusting, then carrying out extrusion with a twin-screw extruder, water cooling and cutting to obtain a double degradation masterbatch and finally carrying out film blowing with a film blowing machine. The formula and the preparation method have the beneficial effects that the adopted starch is rich in sources and low in cost and is environment-friendly; the prepared plastic film has high strength, is low in production cost, is biodegradable and can effectively relieve the problem of white pollution.

The invention provides an anisodamine production method which comprises the following steps: S1, taking belladonna coarse powder, adding 25% to 28% concentration of ammonia for soaking for 15-20min; S2, adding diethoxymethane for percolation, extracting the percolation liquid with 2% sulfuric acid; S3, adding chloroform for cleaning, adding the ammonia to adjust pH to 9, adding carbon tetrachloride for extraction; S4, adding water for washing carbon tetrachloride layer, and adding anhydrous sodium sulfate into chloroform layer for drying; S5, filtering and recovering the chloroform, adding anhydrous benzene for dissolution, and precipitating crystal; and S6, adding benzene for washing, drying at 55-60 DEG C to obtain anisodamine. The anisodamine production method improves the collection rate and collection purity of the anisodamine, the purity reaches 98%, and the process parameters are optimized.

The invention discloses a method for separating chloride from perchloride. The method comprises the main following steps that 1, perchloride waste is added into an evaporator, evaporated liquid chloride is rectified, and carbon tetrachloride and tetrachloroethylene are separated out; 2, residual liquid evaporated in the first step is transferred into a sublimation kettle, water is added for heating to boiling, and meanwhile hot nitrogen is introduced in; 3, hexachloroethane sublimated in the second step is introduced into a trichloromethane dissolving tank for dissolution; 4, hot filtration is performed on the mixture obtained in the third step, the filtrate is cooled and crystallized, centrifugal separation is performed, crystals are dried to obtain a hexachloroethane product; 5, tetrachloroethylene is added into a residue in the second step to be heated and dissolved, hot filtration is performed, the filtrate is cooled and crystallized, and centrifugal separation is performed to obtain a hexachlorobenzene crude product. According to the method, hexachlorobenzene in perchloride organic risk waste is separated out, in addition, the purity of the separated hexachloroethane can be improved, and therefore the quality of the separated hexachloroethane is improved.