85 results about "Mercuric ammonium chloride" patented technology

The invention discloses a low-mercury catalyst used for synthesizing vinyl chloride. The low-mercury catalyst takes mercuric chloride as a main active component, one or more of precious metals such as Au, Pd, Pt, Ru, Rh, Os and Ir salts or complexes thereof as active regulators, and one or more of potassium chloride, ferric chloride, zinc chloride and copper chloride as cocatalysts. By adding trace amount of precious metal salt into the mercuric chloride, the low-mercury catalyst forms a stable composite metal compound, plays a role in fixing and activating mercuric chloride, and still maintains very high catalytic activity and stability when the load capacity of the mercuric chloride is reduced to 0.1-2%.

The invention discloses a method for recycling a waste mercury catalyst. The method comprises the steps of adding the waste mercury catalyst into water, controlling the temperature at 70-95 DEG C, carrying out hot dissolution pretreatment while stirring, regulating the pH value to 1-3, and filtering after carrying out ultrasonic treatment for 10-60min or filtering in an ultrasonic field to separate mercuric chloride and phosphorus and sulfur impurities from activated carbon in time, wherein the mercuric chloride and the phosphorus and sulfur impurities are separated from the surface of the activated carbon; after filtering, washing the obtained activated carbon and sieving to prepare a mercury catalyst; controlling the temperature of mercury-contained filtrate at 50-90 DEG C, adding a neutralizing agent to regulate the pH value to 6-8, and reacting for 30-90min, wherein mercury ions in the solution are completely converted into mercuric oxide sediments, and toxic substances, namely phosphorus and sulfur in the mercury catalyst still remain in the solution; filtering to obtain a mercuric oxide filter cake, and dissolving with hydrochloric acid to obtain a mercuric chloride solution for preparing the mercury catalyst. According to the invention, the waste mercury catalyst is recycled through acidification-ultrasonic synergistic desorption, coupling and filtration, therefore, the method is simple in process, high in efficiency and low in energy consumption.

A provided method for low-mercury catalyst with good heat stability comprises preparation of active carbon, preparation of an adsorption solution, and adsorption processing. The adsorption processing steps comprises ultrasonic assisted adsorption, microwave assisted adsorption and vacuum penetration adsorption. The prepared low-mercury catalyst comprises, in percent by weight, 4.3% of mercuric chloride, 8.6% of zinc chloride, 8.6% of palladium chloride, 2.87% of platinum chloride, 2.87% of tetrabutyl ammonium chloride, 2.87% of tripotasium triphenylphosphine-3,3',3''-trisulfonate, and 0.18% of water. The low-mercury catalyst possesses the mechanical strength of 98.6%, the granularity of 3-6 mm (98%), the bulk density of 460 g/L, and the mercuric chloride ignition loss of 0.39%. The prepared low-mercury catalyst is good in heat stability and low in mercuric chloride loss rate. When the low-mercury catalyst is applied to vinyl chloride synthesis reaction, the acetylene conversion rate is 99.93%, the vinyl chloride selectivity is close to 100%, and the vinyl chloride yield is 95.2%.

The invention discloses a fluorescent probe synthesized by rhodamine B, triethylene tetramine and phenyl isothiocyanate and a preparing method and application thereof. Specifically, firstly, the rhodamine B reacts with the triethylene tetramine to form a spirocyclic amide structure which is stable in property, nitrogenous bridged segments are introduced in, and the rhodamine B reacts with the phenyl isothiocyanate, so that sulphur atoms are introduced in. By means of the thiophil property of mercury ions, each molecule in an obtained novel rhodamine B-phenylthiourea derivative RTTU can be combined with three mercury ions, and therefore high selectivity and detection sensitivity are achieved. Fluorescent probe molecules can conduct detection in a neutral buffer solution, especially an aqueous phase and can also detect the mercury ions from mercuric chloride, and higher practicability is achieved. In addition, the fluorescent probe molecules can be directly precipitated out in the preparing process, further separation and purification are not needed, and the synthesizing method is simple and convenient and easy to implement.

The invention discloses a nitrogen-phosphorus co-doped metal-free catalyst for acetylene hydrochlorination reaction and a preparation method and application of thereof, and belongs to the field of material synthesis technology and application. The nitrogen-phosphorus co-doped metal-free catalyst is prepared by blending acid-washed activated carbon with a precursor solution of nitrogen and phosphorus, dipping, drying and roasting and is applied to preparation of vinyl chloride monomers by hydrochlorination of acetylene. The prepared porous activated carbon metal-free catalyst is large in specific surface area and contains nitrogen and phosphorus at the same time and is simple in preparation process and can replace a toxic mercuric chloride catalyst. The metal-free catalyst is applied to fixed bed acetylene hydrochlorination to prepare vinyl chloride and has good catalytic activity and selectivity and good industrial application prospect.

The invention discloses a processing method of chlorine-containing tail gas produced by mercuric chloride production. The processing method comprises the following steps: producing a sodium hypochlorite solution from tail gas which contains chlorine and mercuric chloride vapor, and then adding nickel chloride (or nickel oxide or nickel hydroxide) for nickel oxide hydroxide generating reaction; mixing sodium hypochlorite with nickel oxide hydroxide in a decomposition reaction kettle for two to three hours; performing coexistence of a solution from the decomposition reaction kettle with nickel oxide hydroxide in a continuous decomposition tank for three to five days, wherein when the pH value approaches to seven to eight, decomposition is completed; then putting a sodium chloride solution into a soluble alkali trough, adding alkali until the concentration of sodium hydroxide reaches 5% to 10%, and then returning to an absorption reaction kettle to be used again; sucking chlorine dioxide, chlorine and hydrochloric acid gas which are decomposed everywhere into a reduction treatment tower by negative pressure generated by a fan to enable the gases to contact with alkali liquor, wherein sodium chloride returns to an alkali liquor precipitation tank, and gases are exhausted by an induced draft fan. With the processing method, stable by-products can be obtained, highly toxic mercury chloride can be recycled, and the up-to-standard release of tail gas can be realized.

A provided method for preparing a low-mercury catalyst by employing high/middle-porosity active carbon comprises preparation of an adsorption liquid and adsorption processing. The adsorption processing step comprises ultrasonic assisted adsorption and microwave assisted adsorption. The prepared low-mercury catalyst comprises, in percent by weight, 4.2% of mercuric chloride, 8.4% of barium chloride, 8.4% of potassium chloride, 4.2% of platinum(II)-ammonium chloride, 4.2% of tetraammineplatinum(II) chloride, and 0.19% of water. The catalyst possesses the mechanical strength of 98.8%, the granularity of 3-6 mm (98.7%), and the bulk density of 475 g/L. The prepared low-mercury catalyst is low in mercuric chloride ignition loss and good in heat stability. When being applied to synthetic reaction of vinyl chloride, the prepared low-mercury catalyst is good in catalysis effect, and helps to reduce reaction time and shorten activation time of hydrogen chloride.

The present invention provides a method for preparing a low mercury catalyst by using activated carbon with a high carbon tetrachloride adsorption value. The method comprises gas phase adsorption, absorption solution preparation and microwave absorption. The microwave absorption comprises first-stage microwave absorption. The first-stage microwave absorption is performed at the temperature of 60 DEG C, the microwave wavelength is 139 mm, the frequency is 2650 MHz, the power is 310 w, and the adsorption treatment lasts for 10 minutes. The method has the beneficial effects that the low mercury catalyst prepared by the method provided by the present invention comprises the following components in percentages by weight: 4.91% of chlorinated mercury, 4% of zinc chloride, 2% of palladium chloride, 2% of platinum chloride, 2% of tetrabutyl ammonium chloride, 2% of triphenylphosphine sulfonic acid potassium and 0.20% of water; the mechanical strength is 99.6%, the particle size is 3-6 mm (99.8%), and the bulk density is 516 g/L; and In the synthesis reaction of vinyl chloride, the conversion rate of acetylene reaches 99.98%, and the yield of the vinyl chloride reaches 97.3%.

The invention relates to an antibacterial and mildew-proof reinforced polypropylene composite material for fan blades and a preparation method thereof; the polypropylene composite material comprises PP, a reinforcing agent, a first compatilizer, an auxiliary agent, an inorganic antibacterial agent, an organic mildew preventive and electret masterbatch; the inorganic antibacterial agent takes silver, copper and zinc as antibacterial main bodies, and takes permutite, silicon, apatite, titanium oxide and zirconium phosphate as antibacterial carriers; the organic mildew preventive is one or a compound of two or more of tetrachloroisophthalonitrile, diclofenac, phenol, pentachlorophenol, phenyl mercury oleate, 8-hydroxyquinoline copper, mercuric chloride and sodium fluoride; the electret masterbatch comprises the main components: 0-100 parts of polypropylene, 8-50 parts of an electret agent, 0-3 parts of a second compatilizer, 0.05-0.35 part of a first antioxidant and 0-3 parts of an anti-aging agent. According to the invention, a compound system of the inorganic antibacterial agent and the organic mildew preventive is adopted, so that the material plays a synergistic mildew-proof rolein the organic mildew preventive and the antibacterial agent.

The invention discloses a preparation method and application of a ratio type divalent mercury fluorescent probe. The structural formula of the divalent mercury fluorescent probe is shown in the specification. The invention also provides a preparation method of the probe. The fluorescent probe shows blue fluorescence in a buffer solution and can carry out a specific reaction with mercuric chlorideto generate a product emitting yellow fluorescence, so that specific response to mercury is realized, and the probe also has good selectivity on divalent mercury.

The invention relates to an antibacterial mildew-proof reinforced ABS composite material for fan blades and a preparation method thereof. The ABS composite material comprises ABS, environment-friendlyalkali-free untwisted glass fibers, a compatilizer, a main antioxidant, an auxiliary antioxidant and a dispersing agent, and is characterized by further comprising an inorganic antibacterial agent and an organic mildew preventive; the inorganic antibacterial agent takes silver, copper and zinc as antibacterial main bodies, and takes permutite, silicon, phospholime, titanium oxide and zirconium phosphate as antibacterial carriers; the organic mildew preventive is one or a compound of two or more of tetrachloroisophthalonitrile, diclofenac, pentachlorophenol, phenyl mercury oleate, 8-hydroxyquinoline copper, mercuric chloride and sodium fluoride. The environment-friendly alkali-free untwisted glass fibers are adopted, the diameter of glass fiber monofilaments ranges from 9 [mu]m to 30 [mu]m, and it is guaranteed that the material has enough strength after being reinforced through the glass fibers; a compound system of the inorganic antibacterial agent and the organic mildew preventive is adopted, so that the material has a synergistic mildew-proof effect on the organic mildew preventive and the antibacterial agent.

The invention belongs to the technical field of chemical materials and discloses a high-activity environment-friendly low-mercury composite catalyst. The high-activity environment-friendly low-mercury composite catalyst comprises the following components according to the product specification weight: 4-6% of mercuric chloride, 0.2-0.6% of barium chloride, 0.2-1% of strontium chloride, 0.2-1% of copper chloride, 0.2-0.5% of calcium chloride, 0.2-0.6% of aluminum chloride and 85-95% of activated carbon. The total weight of the barium chloride, the strontium chloride, the copper chloride, the calcium chloride and the aluminum chloride is 1-3.7%. The high-activity environment-friendly low-mercury composite catalyst has the advantages that expensive mercuric chloride is replaced with a chloride blending agent with relatively low price, and the synthesized high-activity environment-friendly low-mercury composite catalyst is good in stability, low in price and free of pollution to the environment so as to be an ideal high-activity environment-friendly low-mercury composite catalyst.

The invention discloses a method for rapidly identifying the purity of rape hybrids indoors. The method comprises the following step of sterilizing rape seeds, specifically, soaking the hybrid seeds with a 0.1% mercuric chloride solution for 10-15 minutes, cleaning the seeds with ddH2O for 2-3 times, carrying out low-temperature vernalization in a bud stage, putting the sterilized seeds into a culture dish paved with three layers of wet filter paper, putting the culture dish into an artificial climate chamber, placing the seeds at normal temperature for 1-2 days until the seeds germinate, putting the germinated seeds exposing white buds into an incubator at 2 DEG C or 4 DEG C, and carrying out low-temperature treatment for 2-3 weeks; and through artificial low-temperature vernalization, increase of the planting density in a seedling stage and increase of the temperature, sunshine duration and illumination intensity in the growth stage, the growth process is effectively accelerated, and the purpose of rapidly identifying the purity of the hybrids is achieved. The method has the beneficial effects that the growth process is effectively accelerated and the purity of the rape hybrids is rapidly identified through artificial low-temperature vernalization treatment of the rape seeds, coordinated control over the temperature, illumination time and illumination intensity and technical measures such as the increase of the planting density, topping and branch reduction.

The invention discloses a distillation recovery method of a waste mercury catalyst. The method includes the following steps that the waste mercury catalyst is placed in a sodium hydroxide solution, heating is performed to enable mercuric chloride in the waste mercury catalyst to react with sodium hydroxide to convert the mercuric chloride into mercuric oxide, and pretreated waste is obtained; thepretreated waste is placed in a distillation furnace, and heating is performed to decompose mercury oxide in the pretreated waste into mercury vapor; the mercury vapor is introduced into an air condenser for indirect condensation, most of the mercury vapor forms liquid metal mercury, the liquid metal mercury falls into a mercury collecting box at the lower part for storage, and liquid metal mercury and mercury soot are obtained through condensing of the residual mercury vapor by the aid of a multi-tube condenser and enter a mercury collecting tank at the lower part; the tail gas is adsorbed bymodified activated carbon, and the adsorbed tail gas is washed by a sodium sulfide solution and is discharged. Compared with the prior art, the modified activated carbon is adopted to adsorb the tailgas generated after distillation of the waste mercury catalyst, the mercury absorption capacity of the activated carbon can be improved, and thus the cleanliness of the tail gas can be greatly improved.

The invention discloses a method for decomposing sodium hypochlorite. The method comprises the following steps: carrying out gas and liquid mixing and absorbing reaction on exhaust gas which contains chlorine and mercuric chloride vapor and comes from a mercuric chloride synthesis working procedure by using a sodium hydroxide solution with the weight concentration of 5-10%, so as to produce a sodium hypochlorite solution, cooling and dissolving the mercuric chloride vapor into the sodium hypochlorite solution, enabling air to escape from the surface of the solution, when the pH value of the solution is 10.5-11, adding nickel chloride (or nickel oxide or nickel hydroxide) according to the ratio that 25kg of nickel chloride (or nickel oxide or nickel hydroxide) is added into every 1-1.5t of sodium hypochlorite solution, stirring and mixing uniformly, and completing decomposition when the pH value is 7-8; separating nickel oxyhydroxide from the solution, thereby obtaining a sodium chloride solution. The method has the advantages that the decomposition of the sodium hypochlorite solution can be accelerated, the recycling of materials can be realized, and the method is safe and environment-friendly.

The invention belongs to the field of environment and medicine, and discloses a method for preserving a sulfate conjugate and a glucuronic acid conjugate in a liquid sample. The method comprises the following steps: adding mercuric chloride into a liquid sample, and dissolving the mercuric chloride to obtain a solution, the mass of the mercuric chloride being greater than or equal to 0.2 wt% of the mass of the liquid sample. The method has the advantages of being convenient to operate, low in cost, good in preservation effect and the like, can be widely applied to preservation of liquid samples such as sewage and human urine, and has a certain application prospect.

A provided method for preparing low-mercury catalyst by employing high-iodine-value active carbon comprises processing of active carbon and gas-phase adsorption. The gas-phase adsorption step comprises heating and gasifying high-purity mercuric chloride, so as to enable the gas-phase mercuric chloride to enter an adsorption bed loaded with active carbon, controlling the pressure to be 0.6 MPa, the temperature to be 540 DEG C and the flowvelocity to be 1000 m<3>/h. The prepared low-mercury catalyst contains, in percent by weight, 4.07% of mercuric chloride, 3% of zinc chloride, 2% of manganese chloride, 2% of tetraamminepalladium(II) dichloride, 1% of tetrabutyl ammonium chloride, 1% of potassium tetranitroplatinate(II), and 0.16% of water. The low-mercury catalyst possesses the mechanical strength of 99.1%, the granularity of 3- 6mm (99.3%), the bulk density of 485 g/L, and the mercuric chloride ignition loss of 0.28%. The catalyst does not cause mercury sublimation phenomenon at normal temperature, is high in catalytic activity, low in unit consumption, long in service life and less in usage amount.

The invention discloses an air volume control device and method for mercury catalyst drying systems. The device comprises a sedimentation system, the drying system A and the drying system B, wherein the drying system A and the drying system B are arranged in a parallel connection mode. The drying system A is composed of an air blower A, an electric hot air furnace A, a drying furnace A and a pre-drying furnace A, wherein the air blower A, the electric hot air furnace A, the drying furnace A and the pre-drying furnace A are sequentially connected, and the outlet end of the pre-drying furnace A is connected with a draft fan A. The drying system B is composed of an air blower B, an electric hot air furnace B, a drying furnace B and a pre-drying furnace B, wherein the air blower B, the electric hot air furnace B, the drying furnace B and the pre-drying furnace B are sequentially connected, and the outlet end of the pre-drying furnace B is connected with a draft fan B. The outlet end of the draft fan A and the outlet end of the draft fan B are connected with the sedimentation system. The air volume control method mainly comprises the steps of air suction, air volume control during the earlier drying period and air volume control during the later drying period. According to the air volume control device and method, by adjusting the air volume, moisture in a mercury catalyst can be slowly removed, good adsorption of mercuric chloride in active carbon can be kept, the product quality can be improved, the total mercury emission can be decreased, the power consumption can be lowered, and therefore good economic and social benefits can be achieved.

The invention discloses a method for obtaining callus and suspension cells under induction of Taxus chinensis test tube plantlet. The method comprises the following steps: (1) seed testa peeling: mechanical cracking is utilized and the testa is peeled manually; (2) explants disinfection: disinfection is carried out for 90 seconds with 70% alcohol and carried out for 12 minutes with 0.1% mercuric chloride, and washing is carried out by 5 times with sterile water for standby; (3) pretreatment of seed: seed soaking is carried out by 1-5 days at normal temperature hermetically with sterile water; (4) zygotic embryo separation; (5) induction of test tube plantlet: embryo is inoculated to a test tube plantlet induced culture substrate; (6) induction of callus; (7) subculture of callus; and (8) suspension culture of callus. The method has the characteristics of being capable of simply, conveniently and quickly obtaining Taxus chinensis callus and utilizing the callus to provide material for the suspension culture of cells of Taxus chinensis or further screen high-yield paclitaxel cell strains to provide high-quality screening material, thereby saving a great quantity of manpower and material resources and improving the labor efficiency.