40results about How to "With cleaner production" patented technology

The invention discloses aqueous normal temperature curing peelable paint, which is applicable to the technical field of metal surface treatment and consists of the following ingredients in parts by weight: 80 to 90 parts of polyurethane emulsion, 8 to 12 parts of wetting dispersing agents, 2 to 3 parts of nanometer level filling materials, 0.5 to 0.8 parts of defoaming agents, 0.5 to 0.8 parts of flatting agents and 0.5 to 0.8 parts of thickening agents. The aqueous normal temperature curing peelable paint has the advantages that on the basis of the polyurethane emulsion film forming mechanism, through major ingredient screening and compounding of polyurethane emulsion, other film forming auxiliary agents and the like, the aqueous normal temperature curing peelable paint adopting the polyurethane emulsion as major film forming agents is developed. The product has the characteristics that nontoxicity and harmlessness are realized, the pollution is avoided, the operation is simple, the raw material resources are wide, the price is low, the clean production is realized, and the like.

The invention discloses a method for continuously preparing a 2,6-dinonyl naphthalene sulfonic acid. The 2,6-dinonyl naphthalene sulfonic acid is continuously produced through a falling film sulfonation reactor, and the method comprises the specific steps: 2,6-dinonyl naphthalene and a sulfur trioxide gas are continuously introduced into the falling film sulfonation reactor to be subjected to a falling film sulfonation reaction, a sulfonation reaction product is aged, settled to separate out acid residues, extraction and separation are carried out, the separated product is concentrated, acidized, washed with water, evaporated to remove a solvent to obtain the 2,6-dinonyl naphthalene sulfonic acid. According to the method, the efficient production of the high-purity 2,6-dinonyl naphthalene sulfonic acid is realized based on the fact that the 2,6-dinonyl naphthalene is continuously sulfonated in the falling film sulfonation reactor, the process flow is short, the reaction time is short, the facility request is low, the purification of the product is easy, the cost is low, and the industrial production requirements are completely met.

The invention provides a method for clean preparation of medicinal basic magnesium carbonate, belonging to the art of fine chemical industry. The process contain: using salt-produced waste fluid bittern and the by-product incinerator condensate liquid in soda plant as raw material, the volumetric ratio of bittern to condensate liquid being 3: 4; adding bittern into a reactor, heating up to 50-80Deg. C, adding slowly the condensate liquid and with mixing, keeping temperature for 1 hour in reaction temperature; aging for 24 hours after finishing of reaction, filtering, washing with deionized water to wash out sulfate ion and chloride ion; and drying in 90-130Deg. C to prepare basic magnesium carbonate. The invention is characterized in that the product yield is as high as 79-88%, the cost is low, non contaminant is produced, and the production process is simple. The product can also be food-grade basic magnesium carbonate.

The invention discloses a novel normal-pressure boiling dyeable biomass polyester fiber which comprises the following raw materials: 63-68wt% of terephthalic acid, 1.5-33wt% of biomass ethylene glycol, 1.5-33wt% of biomass 1,2-propanediol, 2-8wt% of monomer 5-sodiumsulfa bis-isophthalate (SIPE) and 0.01-0.03wt% of catalyst potassium fluotitanate. A preparation method of the polyester fiber comprises the following steps: performing esterification and polycondensation reaction on the raw materials to obtain a biomass polyester chip; and based on optimal fiber-spinning process parameters, producing to obtain the biomass polyester fiber having a normal-pressure boiling dyeable function. The fiber has the characteristics of natural softness, low static, favorable resilience and low-temperature dyeing, is boiling dyeable under normal pressure, has high dye-uptake rate and dye exhaustion rate, can be blended with a natural fiber such as wool and the like, has the advantages of cost saving, energy consumption reduction and clean production, can reduce the dependence of the chemical fiber industry on petroleum and can greatly relieve resource restriction and environment pressure.

The invention discloses a desulfurization method for fume gas containing low-concentration sulfur dioxide. The desulfurization method comprises the following steps: making zinc hypoxide powder into absorption slurry with a predetermined concentration, making the absorption slurry reversely contact the fume gas containing low-concentration sulfur dioxide in a reverse-injection material feeding pipe of a dynamic wave washing tower, conversing sulfur dioxide into zinc sulfite by utilizing the reactions between zinc oxide and sulfur dioxide, then decomposing zinc sulfite into zinc sulfate through an electrolysis waste liquid, recycling the sulfur dioxide generated by the decomposition into a sulfuric acid producing system, and finally filtering so as to obtain zinc sulfate for leaching.

The invention relates to a recovery method of valuable metal in vanadium chromium slag. According to the method, vanadium chromium slag fine powder and mixed gas mainly dominated by NH3+N2 are subjected to reduction and nitridation to obtain a vanadium chromium nitride slag primary material; then metal iron is removed through ball milling magnetic separation, so that non-magnetic nitridation slagis obtained; then the non-magnetic nitridation slag and chlorine react in a fluidized bed at a low temperature, thus TiN, VN, V2O3 and the like and chlorine react to generate chloride, and chromium chloride is left in the chlorination tailings to obtain chromium-contained chlorination tailings; then after high-boiling-point and low-boiling-point impurities in the chloride are removed, separation is carried out so that pure VOC13 and TiC14 products are obtained; and finally, the chromium-contained chlorination tailings are subjected to the working procedures of leaching out, neutralizing chromium depositing, calcining and the like, so that a Cr2O3 product is obtained. The method achieves comprehensive recovery and utilization of valuable metal iron, chromium, vanadium and titanium in the vanadium chromium slag, and has the characteristics of being high in comprehensive recovery rate, clean and environmentally friendly.

The invention relates to a manufacture method of a native cellulose fiber with a flameproof function. The manufacture method comprises the following steps of: mixing wood pulp with an N-methylmorpholine-N-oxide monohydrate (NMMO) solvent into slurry, removing water by using a vacuum film evaporator to form a spinning viscous solution, extruding the spinning viscous solution from a spinning nozzle by adopting a dry spraying wet type spinning method, regenerating, washing and drying by using a coagulating bath, padding the spinning viscous solution and an N-hydroxymethyl-3-(dimethoxyphosphoryl) propanamide flameproof compound, sequentially carrying out drying, roasting, neutralizing, soaping, washing and drying, and finally, carrying out alkali washing, washing and drying and oiling to manufacture the native cellulose fiber with a long-effect type flameproof function. The native cellulose fiber and the N-hydroxymethyl-3-(dimethoxyphosphoryl) propanamide flameproof compound can generate a special crosslinking reaction in a manufacture process, and the flameproof effect of the native cellulose fiber has the flameproof effect completely according with the testing standards of ASTM (American Society for Testing Material) D6413-1999 and ASTM D2863-1995; meanwhile the native cellulose fiber can be naturally degraded after being discarded, and becomes an environment-friendly material which is harmless to the nature environment.

The invention discloses a cellular convection ventilation exterior wall heat insulation device, and relates to the technical field of heat insulation. The cellular convection ventilation exterior wall heat insulation device comprises a prefabricated heat insulation body, a cellular convection ventilation heat insulation module, an upper ventilation assembly and a lower ventilation assembly, wherein the prefabricated ventilation airflow channel is arranged in the prefabricated heat insulation body; the upper ventilation assembly is located at the upper end of the cellular convection ventilation heat insulation module and is communicated with the cellular convection ventilation heat insulation module; and the lower ventilation assembly is located at the lower end of the cellular convection ventilation heat insulation module and is communicated with the cellular convection ventilation heat insulation module. The cellular convection ventilation exterior wall heat insulation device has the beneficial effects that a cavity-type cellular convection heat preservation and insulation wall body penetrating up and down is achieved; through the arranged automatically controlled heat insulation airtight valve, the cellular convection ventilation exterior wall heat insulation device has ventilating and cooling performance in summer and heat preservation and insulation performance in winter; by a cellular bionic design, the structure is firm; and the cellular convection ventilation exterior wall heat insulation device and a prefabricated standard component are subjected to integral construction.

The invention belongs to the field of anticorrosive protection of coatings of steel structures, and particularly relates to a waterborne rusty coating for protecting the coating of steel-structure work pieces and a preparation method thereof. Antirust pigment is mixed with 8 to 12 parts of water, and ground and dispersed to fineness of 20 to 60 micrometers; and then a cross-linked styrene-acrylate emulsion, a converting agent, a conversion accelerating agent, a defoaming agent, film forming additives, a thickening agent and the balance amount of water are added to the antirust pigment, evenly stirred therewith and packaged. According to the preparation method, the waterborne rusty coating for protecting the coating of the steel-structure of work pieces, which uses the cross-linked styrene-acrylate emulsion as the main film forming agent, is developed on the basis of a film forming mechanism of the cross-linked styrene-acrylate emulsion through screening and compounding main components such as the cross-linked styrene-acrylate emulsion and other film forming additives. A product has the characteristics of no toxicity, harmlessness, no pollution, wide raw material source, low cost, clean production, and the like, and is simple to operate.

The invention discloses a heating method for assembling and molding intermediate terminals. The method is to fix both ends of a heat-shrinkable tube covered with a copper sleeve and then rotate synchronously, and introduce a clean heat source such as an alcohol lamp under the heat-shrinkable tube where the copper sleeve is located. heating. Adopting the technical solution provided by the present invention, compared with the traditional heating method, the present invention has the advantage of cleaner production, and more importantly, through the synchronous rotation and heating at both ends of the heat shrinkable tube, both sides of the heat shrinkable tube shrink uniformly, which solves the problem of assembly shrinkage heat. The problem of twisting the shrink tube improves the production rate of the intermediate connection terminal.