62results about How to "Reduce PAH content" patented technology

The invention relates to a combined hydrogenation method for mineral oil and animal and vegetable oil. In two hydrogenation reaction zones, high-sulfur mineral diesel oil distillate and animal and vegetable oil are respectively used as the raw materials and hydrogenated under different conditions, and the products are mixed to obtain a low-surfur or an even ultralow-surfur diesel oil product, wherein the gas-phase compound flow obtained in the first hydrogenation reaction zone is cycled to the second hydrogenation reaction zone, and the gas-phase compound flow obtained in the second hydrogenation reaction zone is cycled to the first hydrogenation reaction zone. The method can process high-sulfur mineral diesel oil distillate and vegetable oil. The method can be used for obtaining a clean diesel oil product with low sulfur content and high content of polycyclic aromatic hydrocarbon and cetane number under mild operating conditions. The invention saves the equipment and the operating procedure for regular sulfur supplement for hydrogenation of the vegetable oil, reduces the effect of water generated by the vegetable oil hydrogenation reaction on the activity of the hydrogenation catalyst, and prolongs the device operation period.

The invention relates to a combined method for repairing polycyclic aromatic hydrocarbon polluted soil and disposing residual active sludge of sewage treatment, and belongs to the technical field of environmental biology. The method mainly comprises the following steps of: mixing and composting the polycyclic aromatic hydrocarbon polluted soil, the residual active sludge and the biomass waste to obtain partial matured compost, and applying the compost to the polycyclic aromatic hydrocarbon polluted soil to repair. The method can effectively treat and dispose the residual active sludge and repair the polycyclic aromatic hydrocarbon polluted soil, and is simple in process and low in cost.

A liquid smoke coloring agent solution having total water miscibility, a benzopyrene content under about 5 ppb, and a pH above about 11, and a related method for making same by contacting liquid smoke with water and an alkaline agent. The liquid smoke coloring agent solution may be made from commercially existing liquid smoke compositions.

The invention discloses a method for reducing the content of polycyclic aromatic hydrocarbons in coal tar pitch. The method comprises the following steps: adding a potassium hypermanganate modifier into distilled water, and uniformly mixing to obtain a potassium hypermanganate solution; fully freezing original coal tar pitch at the brittleness temperature, grinding and screening to obtain coal tar pitch powder with the particle size of less than 80 meshes, adding the coal tar pitch powder into the prepared potassium hypermanganate solution at the normal temperature, and stirring at a constant speed for reaction at the room temperature to obtain modified coal tar pitch. The method is carried out at the normal temperature; the content of high-activity carcinogens, namely polycyclic aromatic hydrocarbon substances in the obtained modified coal tar pitch is greatly reduced; moreover, the process is simple to carry out, saves energy, reduces consumption, cannot cause secondary pollution and is easy for industrialized production.

The invention provides a transformer oil antigassing additive and a preparation method thereof. According to the invention, extract oil obtained by solvent refining of a cycloalkyl transformer oil fraction is adopted as a raw material, and is subjected to hydrotreating-hydrofinishing, such that hydrofinished oil is obtained; the oil is distilled; a fraction at the temperature higher than 280 DEG C is collected; and the fraction is subjected to liquid-phase denitrification treatment and then the fraction obtained after liquid-phase denitrification treatment is subjected to adsorption refining, such that the additive is obtained. With the method, the transformer oil antigassing additive with a high added value is obtained. The additive has the characteristics of high monocyclic and bicyclic aromatic hydrocarbon content, excellent antigassing performance, low sulfur content, low nitrogen content, low acid value, low polycyclic aromatic hydrocarbon content, and excellent oxidation stability. The additive can be used in a blending component of high-grade transformer oil.

The invention relates to an environmental-friendly rubber homogenizing agent. The environmental-friendly rubber homogenizing agent is prepared from the following components in parts by weight: 70-90 parts of modified petroleum asphalt, 10-30 parts of carbon-hydrogen resin and 1.5-2 parts of p-toluene sulphonic acid, wherein the modified petroleum asphalt is prepared from the following components in parts by weight: 70-90 parts of petroleum asphalt, 1.5-2 parts of phosphoric acid and 10-25 parts of a modifier. The environmental-friendly rubber homogenizing agent has the beneficial effects that comprehensively considering from environmental protection property and using property of a product, at higher temperature, air, the modifier and asphalt component generate chemical reaction in the uniformly mixing process by utilizing oxidation of the air and chemical modification of the modifier, and then the amount of polycyclic aromatic hydrocarbons carcinogen is reduced when the amount of softening point of asphalt is remarkably increased; selected formula system and preparation method can reach good effect, and the acquired homogenizing agent is low in polycyclic aromatic hydrocarbons content and accords with the requirement of European Union REACH Regulations; meanwhile, with the adoption of the environmental-friendly rubber homogenizing agent, blending uniformity of rubber can be remarkably improved, mixing quality is improved, and energy is saved, thus increasing technical content and added value of the product.

The invention provides a production method of pigment carbon black applied to coating. A production technology of carbon black through an oil-gas furnace method specifically comprises the following steps: after filtering air, compressing the air through a Roots blower until the pressure is 0.16 to 0.19Mpa; heating to 700 to 750 DEG C through a high-temperature air pre-heater at 800 DEG C, and thenconveying the air into a combustion chamber; axially conveying natural gas with the flow of 400Nm<3>/h and the pressure of 75kpa into the combustion chamber to be mixed with hot air with the flow of5500Nm<3>/h; then sufficiently combusting and controlling the temperature of the combustion chamber to be 1850 to 1950 DEG C; enabling hot flue gas obtained by combustion to flow through a throat section of a reaction furnace at a high speed; spraying raw oil which is mixed with 20kg/h of an additive and has the flow of 1650kg/h into high-temperature flue gas from the throat section and carrying out cracking and polymerization reaction under the pressure of 65Kpa to generate the carbon black; finally, after sieving through a sieving machine with the size of 35 to 80 meshes, conveying a productinto a finished-product storage tank; and packaging to obtain the pigment carbon black. In a continuous production process, the quality of the carbon black is stable; and technical means including the raw oil, the high-temperature flue gas, temperature, pressure, ozone introduction and the like is combined to improve the quality of the pigment carbon black for the coating.

A method for preparing low-toxicity modified coal pitch for road building includes the steps that coal-tar pitch, terephthalaldehyde modifiers, p-toluenesulfonic acid catalysts and a cyclohexane solvent are fully dissolved, dispersed and continuously stirred for reaction; then, the cyclohexane solvent is recycled through pressure reduction distillation to obtain a coal pitch mixture, and the low-toxicity modified coal pitch for road building is prepared after vacuum drying. The method is simple in technology, low in modification temperature and little in modifier use amount, the solvent can be recycled, the content of 16 toxic polycyclic aromatic hydrocarbons detected by EPA in the modified coal pitch is greatly reduced, and the high-temperature coal pitch is modified into medium-temperature coal pitch.

The invention discloses a production method of environment-friendly high-strength reclaimed butyl rubber, which comprises the following steps: selecting good quality waste butyl rubber inner tube, and crushing into sheets; screening and magnetic separation; adding environment-friendly rubber softener and reinforcing agent for stirring so as to form a composition material; desulfuration and extraction; refining; filtering; and forming. According to the invention, the reclaimed butyl rubber is ensured in quality as good quality butyl rubber material is selected; the reclaimed butyl rubber conforms to requirements of environment-friendly laws and regulations of European Union as no contaminative rubber softener is added during the regeneration process, and also extracting process is added for extracting original rubber aromatic oil. The invention also discloses a composition material formula of the reclaimed butyl rubber. According to the invention, through improving formula processes and finely selecting raw materials, the tensile strength of the produced reclaimed butyl rubber is kept in the range of 8.5-9.5 MPa which is far higher than the national standard of being larger than or equal to 6.8 MPa.

The invention discloses a preparation method of an asphalt material, an asphalt material prepared by the method and application thereof. The preparation method comprises: carrying out purging reaction on an aromatic compound-containing raw material under inert gas purging to obtain an asphalt material. Specifically, based on the total mass of the aromatic compound-containing raw material, the flow rate of the inert gas is 0.5-10L/(min.kg), the purging reaction temperature is 380-440DEG C, and the purging reaction time is 1-10h. The asphalt material prepared by the preparation method provided by the invention can be applied to preparation of waterproof materials, anti-corrosion materials, electrode binders and automobile damping materials, and has very excellent environmental protection performance.

A preparation method of environmentally friendly modified coal tar pitch comprises the steps that medium-temperature coal tar pitch and a potassium hydrogen sulfate catalyst are mixed evenly, meanwhile an aprotic organic solvent low in boiling point and easy to recover and a 10-undecenal modifier are added to make the mixture fully dissolved, continuous stirring is performed at a certain rotation speed, and reflux condensation reaction is performed at the temperature of 30-70 DEG C for 1-8 hours; after reaction is completed, the aprotic organic solvent low in boiling point and easy to recover is recovered, aeration drying is conducted on the obtain solid substance for 24 hours, namely the environmentally friendly modified coal tar pitch is obtained. The operation process is simple, the usage amount of the modifier is small, the usage amount of the catalyst is also small, the reaction temperature is low, the solvent can be recycled, and the industrial production cost is low. The total content of 16 types of emphasized toxic polycyclic aromatic hydrocarbons, detected by coal tar pitch American EPA, in the coal tar pitch after modification is greatly reduced, and medium-temperature coal tar pitch is modified into low-temperature coal tar pitch.

The diesel oil fraction hydrogenating modification process includes the contact of the mixture of material oil and hydrogen with the hydrotreating catalyst or the contact of the mixture of material oil and hydrogen with the hydrorefining catalyst and the hydrotreating catalyst successively, cooling and separating the reacted effluent, reusing the hydrogen-rich gas circularly, and fractionating the liquid product in the fractionating system to obtain diesel oil fraction and naphtha fraction. The process makes it possible to process inferior diesel oil fraction with banal boiling point in mild operation condition and can raise the cetane number greatly, lower the content of polycyclic aromatic hydrocarbon, S and N and reduce the density. In addition the process has high volume space velocity, low operation cost and high product yield.

The invention discloses a multistage cross-flow extraction device and method for catalyzing diesel polycyclic aromatic hydrocarbon by using ionic liquid, and belongs to the technical field of chemical separation and purification. The efficient separation of the catalytic diesel polycyclic aromatic hydrocarbon mixture is realized by adopting a solvent multistage cross-flow extraction method and an extraction agent based on the ionic liquid. The method comprises the steps that catalytic diesel aromatic hydrocarbon to be separated enters a first-stage extractor (C1) from the bottom, an extracting agent A1 enters the first-stage extractor (C1) from the top, and the top of the first-stage extractor (C1) is connected to the bottom of a second-stage extractor (C2); an extraction agent A2 enters a second-stage extractor (C2) from the top, and the bottoms of the first-stage extractor (C1) and the second-stage extractor (C2) are connected with the middle of an extraction liquid flash tank (S2) for flash separation; and a material flow at the top of the second-stage extractor (C2) is connected to the middle part of a raffinate flash tank (S1) for flash separation. According to the method, the problem that the solvent and the raw materials are mixed and dissolved is solved, the yield of an oil product is increased, the purity of the separated oil product is high, and the diesel oil component with high cetane number and the aromatic hydrocarbon with low alkane content are obtained.

The invention discloses coal-based high-density liquid fuel and a preparation method thereof. The preparation method comprises the following steps: S1, contacting coal direct liquefied oil and hydrogen with hydrorefined catalyst to perform a hydrorefining reaction; S2, contacting the reaction effluent in the S1 with a hydrogen cracking catalyst to perform a hydro-upgrading reaction; S3, separatingand fractioning the reaction effluent in the S2 to obtain coal-based high-density liquid fuel, naphtha and diesel fraction. By applying the technical scheme, the coal-based high-density liquid fuel has the yield of 55 percent or more, the density of 0.85g/cm<3> or more and volume calorific value of close to 55 percent or more, and has the characteristics of low sulfur, low nitrogen, low aromatichydrocarbon, rich cycloalkanes, high flash point, high volume specific heat capacity, high thermal stability, good low temperature mobility and corrosion resistance.

The invention discloses an inhibitor for controlling generation of heterocyclic amine and polycyclic aromatic hydrocarbon in beefsteak baking, and belongs to the technical field of food processing. The inhibitor is carotene or maltol, and the usage amount of the inhibitor is 0.08-0.12% of the mass of the steak. A specific use method comprises the following specific use operation steps: (1) uniformly smearing 0.1%-0.15% of an inhibitor on steak, wherein the inhibitor is carotene dry powder or maltol dry powder; (2) processing the steak by baking, wherein a cooking medium is olive oil or animalbutter, the baking temperature is 180-200 DEG C, and the baking time is 15-20 min. According to the processing method disclosed by the invention, the contents of heterocyclic amine and polycyclic aromatic hydrocarbon in baked steak can be remarkably reduced, and operation is simple and feasible. Meanwhile, the used inhibitor is safe and non-toxic and is low in cost, used equipment and materials are commonly seen in daily family life, and the daily eating requirements of consumers on safe and healthy meat products can be met.

The invention discloses a multistage countercurrent extraction device and method for catalyzing diesel polycyclic aromatic hydrocarbon by using ionic liquid, and belongs to the technical field of chemical separation and purification. Through a solvent multistage countercurrent extraction technology and an ionic liquid extraction agent, efficient separation of the catalytic diesel aromatic hydrocarbon mixture is realized. The method comprises the steps that a diesel aromatic hydrocarbon to-be-separated mixture enters a countercurrent mixed extraction tower (C1) from the tower bottom, an extraction agent S enters the countercurrent mixed extraction tower (C1) from the tower top, a material flow at the bottom of the countercurrent mixed extraction tower (C1) is connected with the middle of an extraction liquid flash tank (S2) for flash separation, a material flow at the tower top of the countercurrent mixed extraction tower (C1) is connected with the middle of a raffinate flash tank (S1) for flash separation, and extraction solvent outlets at the bottoms of the raffinate flash tank (S1) and the extract flash tank (S2) are connected with an extraction solvent circulating material flow at the extraction solvent feed port of the countercurrent mixed extraction tower (C1). The problem of miscibility of the solvent and the raw materials is solved, the yield of oil products is improved, and the product purity is high.

The invention discloses a method for reducing the polyaromatic hydrocarbon content in tar of cigarette smoke. The method comprises the steps: packaging tobacco leaves/finished products of cigarettes with cartons, wherein stacking thickness is 26-72cm and stacking density is 0.20-0.34g/cm<3>; and placing the tobacco leaf/cigarette carton on a conveyer at the conveying speed being 0.02-0.3m/s and irradiating the tobacco leaf/cigarette cartons with electron beams/X rays produced by an electron accelerator, wherein the electron accelerator has the energy being 5-10MeV, the beam flow being 0.3-20mA, the beam power being 10-20kW, the maximal scanning width being 100cm, the scanning frequency being 5-15Hz and the irradiation dose being 1-10kGy, the working temperature is set to be 5-35 DEG C, the tobacco leaf/cigarette cartons pass trough a scanning window of the electron accelerator twice to be irradiated, a distance between the center of each tobacco leaf/cigarette carton and the scanning window of the electron accelerator is 40-60cm during irradiation, and the ambient humidity is limited to be not more than 60% during working.

Disclosed is a hydrogenation method for increasing cetane number of diesel oil. According to the invention, a reaction unit is provided with three sequentially arranged reaction zones; in a first reaction zone, a hydrobon catalyst I is filled and a hourly space velocity is 0.5 to 5.0 h <-1>; in a second reaction zone, a hydroupgrading catalyst is filled and a hourly space velocity is 1.0 to 8.0 h <-1>; in a third reaction zone, a hydrobon catalyst II is filled and a hourly space velocity is 1.5 to 12.0 h <-1>; the acidity of the hydrobon catalyst I is less than that of the hydrobon catalyst II. With the utilization of the method provided in the invention, cracking of open loops of annular aromatic hydrocarbons with more than two rings in the raw materials can be realized and the reaction of long-chain alkane cracking into short-chain alkane and the scission reaction of annular hydrocarbon with long side chains can be reduced; therefore, cetane number of diesel oil can be greatly increased under the condition that high yield of diesel oil is maintained.

The invention belongs to the technical field of ink printing and particularly relates to environment-friendly plant oil-based ink used for offset printing. The ink is characterized by comprising the following ingredients in parts by weight: 30-34 parts of gummy oil, 25-39 parts of resin oil, 13-16 parts of a soya-bean oil solvent, 13-27 parts of color pigments, 0.5-2 parts of an additive and 0.8-2.5 parts of a drying agent. The ink provided by the invention has the beneficial effects that the ink is excellent in environmental friendliness, better in abrasion resistance and good in inking property, and has no toxicity, so that waste-paper deinking is easier, the printed volume is large, and the color is deep, abundant and bright. Therefore, the ink can be widely applied to color printing.