511 results about "Butane" patented technology

The invention discloses a cleaning lubricant for textile machinery. The cleaning lubricant comprises the following components in percentage by weight: 6-14% of petroleum ether, 16-26% of solvent oil, 6-14% of alkane oil, 16-26% of 120 # solvent oil, 31-39% of butane gas and 1-9% of dimethyl silicone oil. The invention belongs to the technical field of textile, and particularly relates to a cleaning lubricant for textile machinery, which can clean greasy dirt and dirt on each movable part of a textile mill, a blowing workshop, a drawing workshop, a roving workshop and a spinning workshop. The cleaning lubricant has the technical effects of rust removal, lubrication, rust prevention, wear resistance and non-sticking to all movable parts during cleaning, and the lubricating period of the cleaning lubricant is long.

The invention belongs to the technical field of molecular sieve synthesis, and discloses a ZSM-5 type molecular sieve as well as a preparation method and application thereof. The preparation method comprises the following steps: firstly, carrying out calcination treatment and low-temperature plasma treatment on rectorite to obtain modified rectorite; then adding the modified rectorite and a supplementary silicon source into water, sequentially adding butane-1, 4-bis (dodecyl dimethyl ammonium bromide) and hexadecyl trimethyl ammonium bromide, raising the temperature, adding a template agent, adjusting the pH value of the system, and quickly aging by microwave treatment to obtain a precursor; and finally, heating the precursor, carrying out hydrothermal crystallization reaction, washing, drying and grinding a product, and calcining to obtain the ZSM-5 type molecular sieve. The rectorite is used as all aluminum sources and part of silicon sources for molecular sieve synthesis, the aluminum activity and nucleation sites of the rectorite are improved through modification, then two surfactants are introduced, and microwave treatment is combined, so that silicon and aluminum species in a system are rapidly nucleated, and the efficient, economical and higher-performance ZSM-5 type molecular sieve is prepared.

The invention relates to the technical field of epoxy resin, in particular to self-repairing epoxy resin and a preparation method thereof. The self-repairing epoxy resin is prepared from the following raw materials in parts by mass: 80 to 120 parts of bisphenol A type epoxy resin, 20 to 40 parts of bisphenol F type epoxy resin, 5 to 15 parts of 1, 6-hexanediol diglycidyl ether, 1 to 3 parts of 3, 5-dimethylphenylboronic acid, 1 to 5 parts of furyl maleimide, 10 to 20 parts of dodecanedioic acid, 5 to 15 parts of butanetetracarboxylic acid, 1 to 3 parts of catalyst, 10 to 15 parts of nano silicon dioxide, 1 to 2 parts of boron nitride nanosheet and 1 to 2 parts of hyperbranched polyamidoamine. The curing agent is prepared from the following components in parts by weight: 20-30 parts of epoxy resin, 1-2 parts of sulfydryl-terminated polysiloxane, 20-30 parts of amine curing agent, 5-15 parts of reinforcing filler and 0.5 According to the invention, the balance among self-repairing capability, mechanical property and heat resistance is successfully realized; in the microcrack propagation process, fracture and recombination mechanisms of dynamic covalent bonds effectively prevent further propagation of cracks.

The invention relates to the technical field of automobile air purification, and particularly discloses a filtering material, a preparation method of the filtering material and a novel automobile air conditioner multi-effect catalytic formaldehyde removal filter. The filtering material comprises a PET (Polyethylene Terephthalate) supporting layer, a gas filtering layer and a PP (Polypropylene) electrostatic filtering layer which are arranged in sequence, the gas filtering layer is prepared from the following raw materials in parts by weight: 30 to 90 parts of activated carbon and 10 to 70 parts of manganese catalyst. The gas filtering layer composed of the activated carbon and the manganese catalyst is matched with the filtering material composed of the PET supporting layer and the PP electrostatic filtering layer, four gases of n-butane, methylbenzene, sulfur dioxide and nitrogen dioxide can be adsorbed, the manganese catalyst degrades formaldehyde at normal temperature, meanwhile, the reaction on the formaldehyde is a catalytic reaction, and the environment-friendly effect is achieved. Therefore, the filter material disclosed by the invention also has longer service life, so that a filter made of the filter material has a better formaldehyde removal effect and longer service life.

The invention provides a low-temperature electrolyte, a preparation method thereof and a lithium battery, and relates to the technical field of lithium batteries. The method provided by the invention comprises the following steps: adding a lithium salt and an electrolyte additive into an organic solvent, stirring and dissolving to obtain a low-temperature electrolyte; and the electrolyte additive comprises at least one of lithium nonafluoro-1-butane sulfonate, potassium bis (nonafluoro-1-butane sulfonimide) and potassium perfluorobutanesulfonate. The low-temperature electrolyte can effectively improve the ionic conductivity of the lithium battery, optimizes an SEI film and a CEI film on the surface of an electrode to inhibit the growth of lithium dendrites and the decomposition of the electrolyte, and reduces the energy barrier of lithium ions in the desolvation process during transmission to improve the capacity retention ratio of the lithium battery at low temperature.

The invention provides a post-added nanocellulose enhancing auxiliary agent for latex paint coating and a preparation method and a use method thereof, and the preparation method comprises the following steps: mixing, stirring and heating butanetetracarboxylic acid, sodium hypophosphite and a nanocellulose solution to obtain an esterified nanocellulose solution; adding a silane coupling agent solution into the esterified nanocellulose solution to obtain a modified nanocellulose solution; dispersing nano silicon dioxide into absolute ethyl alcohol to obtain silicon dioxide dispersion liquid; adding a silane coupling agent solution into the silicon dioxide dispersion liquid, mixing, stirring and heating for reaction to obtain modified silicon dioxide powder; dispersing the modified silicon dioxide powder into absolute ethyl alcohol to obtain modified silicon dioxide dispersion liquid; adding the compound emulsifier solution into the modified silicon dioxide dispersion liquid, and shearing and emulsifying to obtain modified silicon dioxide emulsion; and adding a compatilizer into the modified nano cellulose solution, dropwise adding the modified silicon dioxide emulsion, and finally adjusting the viscosity.

The invention belongs to the field of water washing towers, and particularly relates to a multi-stage water washing system for butane dehydrogenation purification, the multi-stage water washing system comprises a tower body, a plurality of groups of filler assemblies and a plurality of groups of spraying assemblies are arranged in the tower body from top to bottom in a staggered manner, and each filler assembly comprises a fixed ring plate I fixedly arranged on the inner wall of the tower body; three packing layer plates which are stacked up and down are arranged at the center position of the first fixing ring plate, two sets of first driving assemblies which are symmetrical about the circle center of the first fixing ring plate are arranged on the first fixing ring plate, the first driving assemblies are connected with the upper packing layer plate and the lower packing layer plate in the packing assemblies, and second driving assemblies are jointly arranged between the first driving assemblies and the corresponding first fixing ring plate; the second driving assembly is connected with the middle packing layer plate. The packing layer is divided, the spraying frame is adjustable, the cleaning effect and convenience are improved, rapid cleaning can be achieved, the production efficiency is improved, the cost is reduced, impurities are efficiently removed, a catalyst is protected, the service life of equipment is prolonged, and the device is reasonable in structure and easy to implement.

The invention discloses a continuous foaming composite process for a pearl wool coiled material and a waste gas recovery system thereof, and belongs to the technical field of pearl wool processing. Aiming at the problems of low efficiency and waste gas pollution of a traditional intermittent process, the process realizes continuous production through raw material selection (the melt index of LDPE is 1.0-2.5 g / 10min), drying and mixing pretreatment, melting and plasticizing through a twin-screw extruder, injection of foaming agents such as butane under the pressure of 8-12MPa, extrusion foaming at a die head of 140-160 DEG C and combination of air-cooling and water-cooling shaping. The compounding link comprises multiple processes such as hot pressing and co-extrusion to adapt to different base materials, after-treatment is conducted through trimming, taper tension coiling and standing stress release, the product density fluctuation is + / -3%, and the peel strength is larger than or equal to 3 N / cm. According to the waste gas recovery system, negative pressure collection is conducted through a closed gas collecting hood, indirect cooling and alkali liquor spraying pretreatment are conducted, activated carbon adsorption concentration and catalytic combustion purification are conducted, the VOCs removal rate is larger than or equal to 98%, the emission concentration is smaller than or equal to 50 mg / m < 3 >, and efficient production and environmental protection benefits are achieved.

The invention relates to the technical field of adsorption material preparation, in particular to modified activated carbon for removing n-butane and a preparation method thereof.The preparation method comprises the following steps that S1, coconut shell charcoal is impregnated and activated, and activated activated carbon is obtained; s2, enabling the activated active carbon to react with polyethyleneimine and epoxy chloropropane to obtain polyethyleneimine-loaded active carbon; s3, dispersing the active carbon loaded with polyethyleneimine in DMF, adding EDC, NHS and 2, 5-bis (trifluoromethyl) terephthalic acid, and reacting to obtain functionalized active carbon; s4, reacting the sucrose modified molecular sieve with an aminated silane coupling agent to obtain a composite modified molecular sieve; s5, reacting the composite modified molecular sieve, the functionalized activated carbon and glutaraldehyde to obtain the modified activated carbon. The functionalized activated carbon and the composite modified molecular sieve are covalently linked through the chemical cross-linking agent to form multiple adsorption sites, so that the adsorption capacity of the modified activated carbon to n-butane is remarkably improved.

The invention belongs to the technical field of organic synthesis, and particularly relates to a catalyst-free continuous production method of chlorotert-butane, which comprises the following steps: adding diluted hydrochloric acid as a starting solution into the tower kettle of a reactive distillation tower, and heating the tower kettle to boil until reflux exists at the tower top; the method comprises the following steps: adding tert-butyl alcohol and concentrated hydrochloric acid into a mixing preheater for preheating, then continuously feeding from a feed port of a reactive distillation tower until the tower top temperature is 45-48 DEG C, the side discharge port temperature is 50-52 DEG C and the tower kettle temperature is 96-105 DEG C, and carrying out reflux according to a reflux ratio of (1.5-3): 1; and continuously extracting crude chlorinated tert-butane from a side discharge port of the tower, cooling, neutralizing, drying and filtering to obtain the chlorinated tert-butane. According to the invention, through the integrated design of the mixing preheater and the reactive distillation column, especially by utilizing the reactive distillation technology to continuously remove the product, the chemical equilibrium limitation of the traditional intermittent process is successfully broken, the raw material conversion rate is obviously improved, and meanwhile, the green production targets of flow simplification, energy consumption reduction and three-waste emission reduction are realized.

Catalysts that include a first zeolite selected from ZSM-5 and Y zeolite impregnated with P2O5 and a second zeolite different from the first zeolite selected from ZSM-5 and Y zeolite impregnated with La2O3. The catalysts can also include alumina, clay, and silica. The catalysts can be used to crack vacuum gas oil (VGO) into gasoline and butylenes. The catalysts can crack VGO with relatively good selectivity for butylenes over butanes.

To provide a carbonaceous material with high performance of adsorbing butanes, a method for producing the same, and an adsorption filter.SOLUTION: With respect to a carbonaceous material according to the present invention, the pore volume (cm3 / g) of pores that each have a pore diameter of 0.80 nm or less as calculated by a QSDFT method per 1 g of the carbonaceous material from the nitrogen adsorption isotherm is from 0.23 cm3 / g to 0.35 cm3 / g inclusive, the packing density as determined in accordance with JIS K1474 (2014) is from 0.43 g / mL to 0.65 g / mL inclusive, and the reactive black 5 value is from 3.0 g / L to 60.0 g / L inclusive.SELECTED DRAWING: Figure 1

The invention provides a spiro butane indolone derivative as well as a preparation method and application thereof, and belongs to the technical field of organic chemical synthesis. The series cyclization coupling reaction of the N-iodo aryl dicyclobutyl amide compound and the vinyl pyridine compound is realized by utilizing a photocatalytic system, and the method is used for constructing the spiro butane indolone derivative containing the pyridine structure. The spirobutane indolone derivative synthesized by the invention has an inhibition effect on H1975 human lung adenocarcinoma cells; the preparation method provided by the invention is mild in condition and simple and convenient to operate, has economical steps, provides a convenient synthesis way for the complex bioactive molecules, and has a good application prospect.

The invention relates to the technical field of ionic liquid synthesis and catalytic synthesis of hydroxybutyl acrylate, in particular to a functional double-acid supported ionic liquid as well as a preparation method and application thereof. The functional double-acid supported ionic liquid comprises an MOFs (Metal-Organic Frameworks) material UiO-66-SO3H and a double-acid ionic liquid supported on the MOFs material. The synthesis of the double-acidified ionic liquid comprises the following steps: synthesizing a dimethyl monomer by adopting imidazole, pyrrolidine or morpholine; reacting the dimethyl monomer with 1, 4-butane sultone to generate sulfonic acid inner salt; and acidifying sulfonic acid internal hydrochloric acid. The functionalized double-acid supported ionic liquid has the advantages that the heat stability and the reusability are good; the product is immiscible with an organic reaction solvent and is easier to separate and recover; as a catalyst for catalyzing esterification reaction, the catalytic activity is obviously improved; as a solid catalyst in an esterification reaction, the catalyst can be applied to a fixed bed reactor, continuous esterification is realized, and the productivity is improved.

The invention discloses a limestone-gypsum wet flue gas desulfurization composite synergist and a preparation method thereof, and relates to the technical field of flue gas desulfurization. The limestone-gypsum wet flue gas desulfurization composite synergist is prepared from the following raw materials in parts by weight: 15 to 18 parts of organic acid, 5 to 8 parts of oxidation catalyst, 8 to 10 parts of sodium salt, 5 to 10 parts of magnesium salt, 12 to 15 parts of surfactant, 5 to 8 parts of organic acid alkali metal salt and 4 to 5 parts of dispersing agent. The preparation method comprises the following steps: reacting 2-dodecene-1-yl succinic anhydride with N, N-dimethyl ethylenediamine to generate a monoamide compound, reacting the monoamide compound with epoxy chloropropane to generate a quaternary ammonium salt compound, and reacting the quaternary ammonium salt compound with sodium sulfanilate to generate the surfactant. The limestone-gypsum wet flue gas desulfurization composite synergist prepared by the invention can promote dissolution of calcium carbonate, and shows good desulfurization efficiency.

The invention discloses flax olive oil for improving, preventing and treating cardiovascular diseases, and belongs to the technical field of grease. The flax olive oil for improving, preventing and treating cardiovascular diseases mainly comprises the following raw material components: olive oil and flaxseed oil, and the mass ratio of the olive oil to the flaxseed oil is (1.5-2.5): 1. Wherein the flaxseed oil is obtained by screening flaxseeds, removing impurities, removing abnormal grains, crushing, extracting for multiple times by adopting a mixed extraction agent, degumming, decolorizing and deodorizing, the extraction temperature is 20-25 DEG C, the liquid-solid ratio is (9-10): 1mL / g, the single extraction time is 35-45 minutes, and the pressure of an extraction tank is 0.30-0.40 MPa; the mixed extraction agent is prepared from the following components in percentage by mass: 18.8 to 37.7 percent of ethanol, 29.7 to 30.4 percent of n-butane, 19.7 to 38.5 percent of dimethyl ether and 12.4 to 12.9 percent of water.

The invention belongs to the technical field of gas separation membranes, and discloses a novel polymer blended carbon molecular sieve membrane for butadiene / butane separation and a preparation method thereof. The polymer blended carbon molecular sieve membrane is prepared by an improved method which comprises the following steps: firstly, introducing a fluorenyl structure into polyimide to prepare high-carbon-content and high-rigidity copolyimide so as to prevent serious pore channel collapse in a carbonization process, and then blending with a polymer with good pore-forming capability according to a certain proportion. The obtained polymer is blended to prepare a flat and uniform flat sheet membrane through a solvent evaporation method, and the flat sheet membrane is carbonized through an improved pyrolysis procedure, so that the prepared carbon molecular sieve membrane has a micropore-ultramicropore structure with uniform size distribution and good mechanical properties; the catalyst shows excellent gas separation performance in butadiene / n-butane, butadiene / iso-butane and other systems, and can effectively solve the industrial problem of high energy consumption of C4 fraction separation.

The invention relates to a preparation method and application of sulfonated polysulfone. The preparation method of sulfonated polysulfone comprises the following steps: providing polysulfone, and providing a predetermined reagent; carrying out chloromethylation reaction on the polysulfone and bis (chloromethoxy) butane to obtain chloromethylated polysulfone; the predetermined reagent and chloromethyl in the chloromethylated polysulfone are subjected to a nucleophilic substitution reaction, sulfonated polysulfone is obtained, and the predetermined reagent is at least one of 4-hydroxybenzene sulfonate, 1, 2-dihydroxybenzene-3, 5-disulfonic acid disalt and dodecylbenzene sulfonate. According to the sulfonated polysulfone provided by the embodiment of the invention, the volume change is relatively small when the sulfonated polysulfone absorbs water and swells, so that the sulfonated polysulfone has relatively strong anti-swelling capability.

The invention relates to the technical field of maleic anhydride production, in particular to an n-butane fixed bed oxidation and DBP solvent absorption system, a molecular sieve membrane and a preparation method, the system comprises an air pretreatment unit, an oxidation unit and an absorption unit; the oxidation unit comprises an n-butane evaporation tank, an air-butane mixer, an oxidation reactor, a fused salt cooler, a gas cooler and a switching cooler; a molecular sieve filter body is arranged at a bottom outlet of the switching cooler; the absorption unit comprises an absorption tower, and the absorption tower is used for absorbing crude maleic anhydride in the reaction generated gas passing through the molecular sieve filter body; the molecular sieve filtering body is provided with an inlet for the reaction generated gas to enter, an outlet for the reaction generated gas to release and an internal cavity for communicating the inlet and the outlet, and after the reaction generated gas in the cavity is released through the outlet, part of water is filtered. The system can be used for efficiently adsorbing and removing moisture in the butane oxidation generated gas, and coking of equipment is reduced.

The application belongs to the field of organic synthesis, and particularly relates to a synthesis method of 2-(3,3-dimethylbutyl)pyridine. 2-vinylpyridine, brominated tertiary butane, a mixed solution of dimethyl ether and isopropyl ether as a reaction system solvent, nickel iodide as a nickel salt, bipyridine as a ligand, dicyclohexylmethylamine as a base in the system, 2,6-dimethyl-3,5-diethyl-1,4-dihydropyridine as a reducing agent, a photocatalyst 2,4,5,6-tetrakis(9 ‑ Carbazole) - m-phenylenedinitrile, under the condition of room temperature and nitrogen atmosphere, a reduction cross-coupling reaction is used to synthesize 2-(3,3-dimethylbutyl)pyridine. The application uses inexpensive nickel metal as a catalyst, constructs a cross-coupling reaction of carbon-carbon bond, and has the advantages of mild reaction condition, high economy and the like.

The present invention belongs to the technical field of membrane separation, and specifically relates to a CPOS-based mixed matrix membrane and its preparation method and application. In the present invention, polyethylene glycol is used as the polymer matrix, and crystalline porous organic salt is used as the filler. The crystalline porous organic salt is introduced into the polymer matrix to construct a CPOS-based mixed matrix membrane; the mass of the crystalline porous organic salt is 14% - 34% of the total mass of the CPOS-based mixed matrix membrane. For the CPOS-based mixed matrix membrane of the present invention, at a pressure of 1 bar, when the mass of the crystalline porous organic salt is 33.33% of the total mass of the CPOS-based mixed matrix membrane, the separation factor for 1,3-butadiene and n-butane can reach 4.21, and the separation factor for 1,3-butadiene and isobutene can reach 4.78, showing good separation performance.

The utility model provides a system for separating n-butane and iso-butane through differential pressure thermal coupling rectification, which comprises an iso-butane separation tower A, an iso-butane separation tower B, a tower A reflux tank, a tower B reflux tank, a tower A condenser, a cooler or heater, a tower A reboiler, a tower B reboiler, a tower A reflux pump and a tower B reflux pump, the tower A condenser, the tower A reflux tank and the tower A reflux pump are sequentially arranged on a tower top material pipeline of the isobutane separation tower A, the tower A reboiler is arranged at the tower bottom of the isobutane separation tower A, and the tower B reboiler is arranged at the tower bottom of the isobutane separation tower B. According to the system, an isobutane separation tower A serves as a low-temperature low-pressure tower, an isobutane separation tower B serves as a high-temperature high-pressure tower, condensation heat at the tower top of the isobutane separation tower B serves as a heat source of a reboiler at the tower bottom of the isobutane separation tower A, and the isobutane separation tower A and the isobutane separation tower B are thermally coupled; the steam consumption of the isobutane separation tower A is reduced, the refrigerant consumption at the tower top of the isobutane separation tower B is reduced, and the energy consumption is reduced.

To provide an engine starting device that has a simple configuration and reduces fuel consumption when starting the engine. [Solution] A starting device 100 for engine E that starts with butane gas 3 and operates normally with kerosene 4, comprising a vacuum valve 8 configured to supply butane gas 3, a carburetor 5 configured to supply kerosene 4, a throttle SV provided on the carburetor 5, and a control device, wherein when starting engine E, the control device controls the opening S of the throttle SV of engine E to opening S1 so that the intake vacuum of engine E acts on the vacuum valve 8 to supply butane gas 3 to engine E, and kerosene 4 is not supplied to the carburetor 5 of engine E, and only butane gas 3 is supplied to the intake pipe 6 of engine E, thereby starting engine E.

The application provides a kind of load exosome composite hydrogel and preparation method thereof, belong to biomaterial and drug delivery technical field;Its preparation method includes: modified chitosan;Modified hyaluronic acid;Preparation of biphasic calcium phosphate nanoparticles;Preparation of composite hydrogel.The application is through nucleophilic ring-opening reaction of 1,2-epoxy butane and the hydroxyl group of chitosan, form hydroxybutyl ether bond, give hydroxybutyl chitosan temperature sensitive characteristics, then, again, after activation 3,4-dihydroxyphenylalanine is condensed with hydroxybutyl chitosan, form amide bond, to graft 3,4-dihydroxyphenylalanine on hydroxybutyl chitosan, after modification of chitosan, 3,4-dihydroxyphenylalanine can form strong adhesion interface with cartilage, synovial membrane and other tissues through hydrogen bond, pi-pi stacking and metal coordination, thereby effectively prolonging the residence time of hydrogel in joint.

The invention discloses a production method of petroleum-based tetrahydrothiophene, and belongs to the technical field of fine chemicals. Liquid sulfur and hydrogen in the stone chemical engineering process are used as raw materials to synthesize hydrogen sulfide, meanwhile, butane in the stone chemical engineering process is subjected to air oxidation to prepare maleic anhydride, the maleic anhydride is used as a raw material and subjected to a catalytic reaction with hydrogen to synthesize tetrahydrofuran and gamma-butyrolactone, and tetrahydrofuran and hydrogen sulfide are subjected to a catalytic reaction to synthesize tetrahydrothiophene. Compared with a direct catalysis process adopting tetrahydrofuran and hydrogen sulfide, the process has the advantages that the variety of high value-added products is various, the production cost is low, the safety of the production process is high, and the petroleum-based fine chemical industry chain is extended.

The present application provides a shaped catalyst for selective oxidation of n-butane and a preparation method thereof. The shaped catalyst comprises an active component and a hydroxyl silicate, wherein the active component comprises vanadium phosphorus oxide. The present application also provides a method for preparing maleic anhydride by using the catalyst. In the preparation process of the catalyst, the hydroxyl silicate is added as a lubricant and a reinforcing agent, the mechanical strength of the shaped body of the catalyst after the hole expansion treatment is improved, various shaped bodies with stable structures are obtained, and the selective oxidation of n-butane can produce valuable products with high selectivity.

A process for separating 1-butene from a C4 raffinate gas composition includes introducing the C4 raffinate gas composition to a reactor containing an adsorbent material and passing the C4 raffinate gas composition through the adsorbent material; adsorbing the 1-butene from the C4 raffinate gas composition onto the adsorbent material to separate the 1-butene from the C4 raffinate gas composition and form a residue gas composition; and desorbing the 1-butene by heating the adsorbent material after the adsorbing to form the 1-butene and regenerate the adsorbent material. The adsorbent material is at least one of a zeolite adsorbent and an alkali-modified zeolite adsorbent having at least 99% by weight selective towards 1-butene for adsorption in comparison to iso-butene and iso-butane.

The invention relates to a combined inhibitor for reverse flotation magnesium removal of medium-low grade phosphorite and application thereof. The combined inhibitor comprises sodium sulfate, 1, 2, 4-butanetricarboxylic acid and sulfuric acid. The application method comprises the following steps: grinding raw ore, adding water and mixing to obtain ore pulp; the pH of the ore pulp is adjusted, then the combined inhibitor is sequentially added and mixed, then a collecting agent is added and mixed, flotation is conducted, and phosphate concentrate and phosphate tailings are obtained; the flotation process comprises one-time rough flotation, at least one-time fine flotation and at least one-time scavenging; the combined inhibitor provided by the invention is good in calcium and magnesium interference resistance and high in selectivity, the dosage of sulfuric acid is remarkably reduced, the pH value of ore pulp is increased, magnesian gangue in phosphorite is effectively removed through the synergistic effect of all the components, the grade of phosphate concentrate is increased, meanwhile, the recovery rate is high, and the combined inhibitor has good industrial application prospects.

The invention discloses a chiral 1, 4-diazabicyclo [3.1. 1] heptane derivative as well as a synthesis method and application of the chiral 1, 4-diazabicyclo [3.1. 1] heptane derivative. According to the invention, a 1-azabicyclo [1.1. 0] butane derivative is taken as a raw material, under the catalytic action of a chiral iridium complex, the 1-azabicyclo [1.1. 1] butane derivative and an N-allyl carbonate derivative are subjected to [3 + 2] cycloaddition reaction, a series of chiral 1, 4-diazabicyclo [3.1. 1] heptane skeletons with diversified structures are constructed with high stereoselectivity, and the obtained product has the potential of further derivatization. The method has the advantages of easily available raw materials, mild reaction conditions, simplicity and convenience in operation, good functional group compatibility and the like.

1. Name of the designed product: adapter for gas nozzle (butane). 2. Use of the designed product: adapter for gas nozzle. 3. Design points of the designed product: in shape. 4. Picture or photo best indicating the design points: perspective view 1.