182 results about "Chemical engineering" patented technology

The invention discloses a continuous preparation technology of high-purity low-viscosity dimethicone. The continuous preparation technology comprises the following steps that 1, a mixture of methylcyclosiloxane and an end-capping reagent is orderly subjected to liquid nitrogen freezing dehydration and deep dehydration until the water content of the mixture is less than 300ppb; 2, the treated mixture is subjected to adsorption filtration, nanofiltration membrane filtration and pre-heating, then is fed into a fluidized bed with a catalyst and undergoes a catalytic reaction; and 3, reaction products are subjected to adsorption filtration, nanofiltration membrane filtration and a low-boiling-point substance removal process so that a low-boiling-point substance is removed and the high-purity low-viscosity dimethicone is obtained. The high-purity low-viscosity dimethicone obtained by the continuous preparation technology has the advantages of low ion content, low hydroxyl content and low solid content. The continuous preparation technology has a raw material utilization rate of 100%, realizes zero discharge, is an environmentally friendly green technology and is suitable for low-viscosity dimethicone production.

A process for the preparation of a heterocyclic macrocycle-templated supramolecular metal organic material, the process comprising preparing a reaction mixture containing a metal, a heterocyclic macrocycle, and organic ligands and forming, in the reaction mixture, a heterocyclic macrocycle-templated metal organic material comprising the metal, the heterocyclic macrocycle and the ligands by template-directed synthesis with the heterocyclic macrocycle serving as the template and being encapsulated within a cage of the template metal organic material.

According to the invention, the porous carbon-coated nano zero-valent iron composite catalyst is prepared by taking a metal skeleton as a precursor, and has excellent catalytic performance in an electro-Fenton process. The synthesis method has the advantages of simplicity and convenience in operation, low equipment requirement, good product performance reproducibility and the like. Due to the synergistic effect of iron and carbon, electron transfer is accelerated, and the catalytic efficiency is remarkably improved. The iron-carbon material has strong magnetism, can be quickly separated in a magnetic field, and is convenient to recover.

The invention relates to a full automatic extraction device, which is used for extraction experiment in a chemical laboratory. The device comprises a shell, a getter device, an extraction container and a tap funnel which are fixedly arranged on the shell, wherein the tap funnel is positioned on the upper part of the extraction container; the extraction container is communicated with the getter device through an air duct and connected positions are all closed; the bottom end of the extraction container is provided with an imbibition long tube; the imbibition long tube passes through an opening on the top part of the tap funnel to the bottom of the tap funnel; the bottom of the tap funnel is provided with a drain pipe; the drain pipe is provided with a control valve; and the getter device is arranged in the shell, an outlet of the getter device is connected with a vent pipe, and the vent pipe extends outside the shell. The device adopts batch type vacuumizing principle, guides organic phase and aqueous phase to come and go rapidly in the extraction container and the tap funnel so as to make a target compound sufficiently transfer from the aqueous phase to the organic phase, thereby realizing liquid-liquid extraction and separation. The device can replace manual operation and save time and labor, and has good uniformity, an experimenter cannot breathe harmful gas, so the device is favorable for protecting human body from harm.

The invention provides a method for separating aromatic hydrocarbon from alkane by ionic liquid and membrane process coupling technology. The method includes that a hollow fiber membrane component is used as an extraction and separation device, ionic liquid is filled in pores of a hollow fiber membrane to form extract, aromatic hydrocarbon and alkane mixed liquor and a back-extraction phase respectively flow in a tube pass and a shell pass of the hollow fiber membrane in parallel or reversely, aromatic hydrocarbon is preferentially transferred to the back-extraction phase via the extract owing to the difference between the solubility of the aromatic hydrocarbon and the solubility of alkane in the ionic liquid, and the purpose of separating the aromatic hydrocarbon from the alkane is achieved. The method has the advantages of good selectivity, high mass transfer efficiency, low dosage of extracting solvent, simplicity in technological process, high stability and the like.

The invention relates to a method for preparing a test solution for quality detection of a safe stagnation removing preparation. The method comprises the following steps of: (1), extracting solution preparation: weighting 0.5-10.0g of solid safe stagnation removing preparation or contents thereof, adding a universal solvent for extracting alkaloid, carrying out ultrasonic treatment or heating backflow, cooling down, and filtering to obtain a filter liquid as an extract liquid for later use; or weighting 4-80ml of liquid safe stagnation removing preparation, and filtering to obtain the filter liquid as the extract liquid for later use; and (2) extract liquid purification: taking out the extract liquid, drying through steaming, dissolving residues by adding 1-10ml of hydrochloric acid solution (1-5,000) to the residues, centrifuging a mixed solution, taking out supernatant to slowly pass through an octadecylsilane bonded silica gel column (50-500mg), eluting by water of 2-30ml, collecting an effluent liquid and an eluting liquid, drying by steaming, dissolving the residues by adding 1-10ml of methanol with the volume percent of 30-100% or alcohol with the volume percent of 50-95%, standing, and taking out supernatant which is the test solution for a leonurus indexity element stachydrine hydrochloride thin layer discriminating and/or content determining method in the safe stagnation removing preparation.

The invention discloses a resin-based nano-lanthanum material and a preparation method and application thereof, and belongs to the field of environmentally functional materials. The preparation methodincludes the following steps: 1) dissolving lanthanum chloride heptahydrate and concentrated hydrochloric acid in alcohol, performing mixing, adding a resin polymer, and performing stirring at room temperature; 2) filtering the resin after completion of stirring, and performing drying; 3) adding the resin to a precipitant solution, and performing stirring at room temperature so as to filter out the resin; and 4) washing the product by using water until neutrality, adding a NaCl solution, performing stirring, filtering out the resin, and performing drying so as to obtain the resin-based nano-lanthanum material. Lanthanum is mixed with hydrochloric acid so as to make lanthanum and chloride ions form complex anions, lanthanum in the form of complex anions in alcohol is uniformly adsorbed into anion exchange resin pore channels, then the nano-lanthanum compound is further generated in situ, and the prepared nano lanthanum particles have more uniform distribution, and have a high phosphorus adsorption rate.

The invention discloses a low-temperature peracetic acid disinfectant and a preparation method thereof. The low-temperature peracetic acid disinfectant is prepared by mixing a composite low-temperature solvent and peracetic acid in any proportion, and the composite low-temperature solvent comprises the following components in percentage by mass: 60-99% of water, 1-40% of an antifreezing agent, 0-5% of a thickening agent and 0-5% of a corrosion inhibitor. The low-temperature freezing liquid can be used at different low temperatures, the lowest freezing point can reach -25 DEG C, and the low-temperature freezing liquid also has the characteristics of small metal corrosion, low volatilization and low irritation. The invention solves the dilemma of lack of efficient, stable and environment-friendly products in current low-temperature disinfection, solves the problems of poor stability, high irritation, low activity at low temperature, poor effect and the like of conventional products, and can be used for disinfection in various links of a cold chain and various low-temperature environments.

The invention provides a non-sticky metal surface and a preparation method thereof. The method comprises the following steps: S1, irradiating the clean metal surface by adopting pulse laser, and etching a nano-scale or micron-scale micro-nano structure used for achieving the super-lyophobic characteristic or the lyophobic characteristic on the metal surface; and S2, cleaning and spraying the metal surface of the micro-nano structure ablated with a low-surface-energy coating. According to the non-sticky metal surface and the preparation method thereof, the micro-nano structure is ablated on the metal surface through the pulse laser, the metal surface of the micro-nano structure is sprayed with the low-surface-energy coating, so that the metal surface has the super-lyophobic characteristic or the lyophobic characteristic, the effect of being not sticky to viscous beverages such as milk and yoghourt and dairy products can be achieved, the non-sticky performance is lasting, and the non-sticky metal surface can be reused.

The invention discloses an acetic acid styracin nanometer capsule and a preparation method thereof. The acetic acid styracin nanometer capsule is prepared from gelatin/gum arabic as a wall material, acetic acid styracin as a core material, tween 20 as an emulsifying agent, and glutamine aminopherase as a curing agent by using a composite coacervation method, and in the process of the preparation, the quantity of the gelatin, the gum arabic, the acetic acid styracin, the tween 20 and the glutamine aminopherase are computed in a mass ratio of 1:1:1-2:1-2:0.25. The acetic acid styracin nanometer capsule has favorable storage stability and heat stability, and can durably and effectively control the release of the core material, wherein the average particle diameter is 168.48nm-211.67nm, and the particle size distribution coefficient is 0.132-0.154. The acetic acid styracin nanometer capsule can be used in the fields of spice, essence, foods, cosmetics, detergents, and the like.

The invention discloses parallel polymerization synthesis equipment which comprises an elevating mechanism provided with a transition saddle and an elevating pallet. An annular heating seat is arranged on the transition saddle, at least two heating kettles are embedded into the heating seat, and heat supply equipment of different heating kettles have different power and are separately arranged; the heating seat is provided with round holes over the heating kettles, and the round holes and the heating kettles form a flask seat. The upper part of the elevating pallet is connected with a stirring saddle, the lower part of which is provided with stirring axes that have the same quantity as the heating kettles and are connected with stirring paddles at the lower part, and the stirring paddles and the stirring axes are all positioned right above the corresponding heating kettles; and a stirring driving motor is arranged over the stirring saddle. The parallel polymerization synthesis equipment is applicable to stirring and mixing reactants or products with high or low viscosity, can provide multiple reaction temperature and stirring speed in a same reaction period, and is applicable to reaction containers of various types, thereby greatly saving the scientific research time of researchers, reducing labor intensity in scientific research, improving scientific research efficiency, and quickening the development of scientific research.

The invention discloses a preparation method of battery-grade anhydrous lithium hydroxide, wherein industrial-grade lithium hydroxide monohydrate is used as a raw material, and the preparation steps comprises: dissolving, ultrafiltration, adsorption, recrystallization, jet milling, vacuum drying, electromagnetic iron removal, vacuum packaging and the like so as to finally obtain the battery-gradeanhydrous lithium hydroxide. The process is simple and high in operability, the added value of products is greatly increased, and economic benefits and social benefits of the products are increased.

The invention discloses an oil-control pore-shrinking composition containing lactobionic acid. The oil-control pore-shrinking composition comprises the following components in percentage by weight: 0.0001-20% of lactobionic acid, 0.0001-30% of a flos spiranthis sativae extract, 0.0001-20% of nicotinamide and 0.0001-20% of carnitine. The oil-control pore-shrinking composition disclosed by the invention can intelligently identify aged keratinocytes, remove aged dead cells and promote the regeneration of the keratinocytes. The oil-control pore-shrinking composition can remove dirt in pores, helpthe proliferation of hyaluronic acid and collagen in a dermis layer, increase the water content of skin, visually shrink the pores and enable the whole skin to become compact and elastic. The flos spiranthis sativae extract can effectively shrink coarse pores, inhibit abnormal oil production of hair follicles and inhibit bacterial reproduction and prevent acnes. Moreover, the oil-control pore-shrinking composition is mild and non-irritant, can serve as an oil-control pore-shrinking active component and is applied to various cosmetics.

The invention discloses application of an Mg/Fe oxide modified biochar nano composite material in removing antibiotics, the Mg/Fe oxide modified biochar nano composite material takes biochar as a matrix, and Mg/Fe oxide is loaded on the surface of the biochar; the application method comprises the following steps: mixing the Mg/Fe oxide modified biochar nano composite material with ammonium persulfate and an antibiotic solution, and reacting to complete the removal of the antibiotics. The Mg/Fe oxide modified biochar nano composite material has the advantages of low price, high efficiency, large-scale production, high adsorption capacity, capability of quickly realizing solid-liquid separation, environmental friendliness and the like, is applied to activating persulfate to degrade antibiotic pollution in a water body, and is good in removal effect and high in reaction speed.

The invention provides a method for preparing large-particle baking soda by a secondary carbonization method and the obtained baking soda. The method comprises the following steps of: 1) taking a sodium carbonate solution, and performing purifying; 2) enabling the solution to enter the upper part of a pre-carbonization tower, and carrying out pre-carbonization reaction with carbon dioxide gas; 3)discharging the pre-carbonized solution from the bottom of the pre-carbonization tower, and performing cooling; 4) feeding the solution obtained in step 3) into the middle part and the upper part of the carbonization tower in a multi-strand manner, feeding carbon dioxide into the middle part and the lower part of the carbonization tower in a multi-strand manner, and carrying out carbonization reaction to generate baking soda crystal mush; 5) compressing the carbon dioxide tail gas exhausted from the top of the carbonization tower, and enabling the compressed carbon dioxide tail gas to enter the lower part of the pre-carbonization tower; and 6) discharging the baking soda crystal mush from the bottom of the carbonization tower, and performing separating and drying to obtain baking soda. Large-particle baking soda is obtained through pre-carbonization, cooling and carbonization in the carbonization tower in a multi-strand feeding and multi-strand air inflow mode, and the yield of the baking soda is increased; the pre-carbonization tower absorbs the tail gas of the carbonization tower, so that the utilization rate of carbon dioxide is increased, and the economic benefit is good.

The present invention relates to a process for producing hydrocarbons, said process comprising the steps, where feedstock of biological origin is degummed, the degummed feedstock is subjected to bleaching and/or hydrolysis, followed by hydroprocessing and catalytic cracking.

The present invention discloses a choline particle and a preparation method and an application thereof. The preparation method comprises the following preparation steps: step one, crushing choline topass a 20-100 mesh sieve; step two: dissolving a first binder in water to obtain a binder solution; and step three: after mixing the choline processed in the step one with a second binder, putting themixture into a granulator, and adding the binder solution obtained in the step two for granulation to obtain the choline particle. The binder is dissolved in water, then the choline is granulated, the prepared granule is uniform and moderate in size, good in fluidity, and not easy to absorb moisture; and a prepared pressed tablet is smooth on surface, small in difference in tablet weight, good inhardness (good in friability), and good in disintegration.