128results about How to "Reaction condition control" patented technology

The invention discloses a preparation method of a thermotropic liquid crystal polyarylester fiber, relates to a preparation method of thermotropic liquid crystal polyarylester, and aims to solve the problems that the existing method for preparing the thermotropic liquid crystal polyarylester is complex and the polyarylester fiber is low in tensile strength. The preparation method of the thermotropic liquid crystal polyarylester fiber comprises the following steps: step one, adding p-hydroxybenzonic acid, 2-(4-hydroxyphenyl)-5-carboxylbenzimidazole, acetic anhydride, 4-diethylaminopyridine and an antioxidant into a polymerization kettle for carrying out melt condensation polymerization to prepare a pre-polymer of thermotropic liquid crystal polyarylester; step two, putting the pre-polymer in a rotary kiln under the condition with nitrogen protection for carrying out solid phase polycondensation reaction to obtain high-molecular-weight polymer powder; step three, mixing the high-molecular-weight polymer powder, then cooling and drawing to prepare primary polyarylester fiber; and step four, carrying out heat treatment on the primary polyarylester fiber. The preparation method of the thermotropic liquid crystal polyarylester fiber is simple to operate; the tensile strength of the polyarylester fiber which is finally obtained can reach 4.0-4.5GPa.

The polygelatin peptide injection is prepared with gelatin of ox bone, pig bone, etc. and through dissolving, hot degradation in controlled condition, cross-linking with non-toxic cross-linking agent, mixing with electrolyte, adsorption, clarification and stepped filtering to separate cross-linked spherical molecule. During the preparation, the molecular weight of the cross-linked matter is well controlled.

The invention discloses a method for oxidizing alcohol into aldehyde, ketone or carboxylic acid. The method utilizes a metal nitrogen heterocyclic carbine compound as the catalytic agent and oxygen in air as the oxidizing agent. The method comprises the steps of selectively oxidizing alcohol compounds into the aldehyde or the ketone efficiently and gently; and oxidizing alpha-hydrogen-free primary alcohol into corresponding carboxylic acid compounds efficiently under the heating condition.

The invention provide a device and method for treating municipal wastewater with a low C/N ratio through a silicon source adsorption/nitrification/partial denitrification/anaerobic ammonia oxidation coupling process, and belongs to the field of wastewater treatment. According to the method, municipal domestic wastewater enters an adsorption tank at first, and most organic substances in the wastewater are adsorbed by activated sludge through mixed aeration; after precipitation, a supernatant enters a nitrification/partial denitrification/anaerobic ammonia oxidation reactor, and part of the sludge enters a fermentation tank; low-oxygen aeration is carried out after the supernatant enters a nitrification/partial denitrification/anaerobic ammonia oxidation reactor, and then short-cut nitrification and anaerobic ammonia oxidation are carried out synchronously; short-cut nitrification is not strictly controlled, so that part of ammonia nitrogen is subjected to complete nitrification; after the reaction is finished, the content of nitrate nitrogen in the nitrification/partial denitrification/anaerobic ammonia oxidation reactor is very high, and meanwhile the fermented supernatant is pumped for anoxic stirring; by use of a silicon source in a fermentation solution, nitrate nitrogen is reduced to nitrite nitrogen for an anaerobic ammonia oxidation reaction with ammonia nitrogen in the fermentation solution, so that total nitrogen in the municipal domestic wastewater can be efficiently removed.

The invention belongs to the technical field of preparation of composite materials and discloses a ferric oxide/bismuth oxybromide composite material and a preparation method and application thereof. The ferric oxide/bismuth oxybromide composite material is formed by ferric oxide nano-clusters depositing on the surfaces of bismuth oxybromide nano-sheets. The preparation method comprises the steps of adding an alkali solution into a ferric nitrate solution to obtain a ferric hydroxide colloidal solution, adding a KBr solution into a bismuth nitrate solution, performing mixing to obtain a mixed solution, dropwise adding the ferric hydroxide colloidal solution into the mixed solution and performing hydrothermal reaction to obtain the ferric oxide/bismuth oxybromide composite material. The preparation method has the advantages of being simple in preparation process and low in cost, having very good environmental protection benefits and the like, the prepared composite material has excellent photocatalytic performance and is widely applied to the field of photocatalytic degradation of dye wastewater, and the higher catalytic efficiency can be obtained.

The invention relates to a strand substitute polymerase chain reaction, which is characterized in that a target gene chain to be detected is substituted by a probe containing reporter gene chain having a different sequence for indirect amplification, the probe sequence is complementary sequences selecting two small segments of conserved or specific sequences adjacent to target genes as double probes, different sequences of the reporter gene chain refers to a gene sequence which has minimum homology with the target gene chain or is in farther germ line, and the head and the tail of the reportergene chain are added with the given double-probe sequences to serve as linear band probe reporter genes. The target genes to be detected and the given head and tail probe sequences of the reporter genes are complementally hybridized so that the head and the tail of linear reporter genes are closed and linked, single-strand gaps of a hybrid are connected by ligase, and the target link is substituted by a reporter gene ring, namely a reverse PCR amplified reporter gene ring. By monitoring different sizes (at two ends) of reverse PCR amplification or the reporter genes with different codes, multi-target molecules can be indirectly indicated. More than one set of reporter genes can be alternately used.

The invention provides a fermented Radix Astragali preparation method. Fermented Radix Astragali is obtained through fermenting Radix Astragali by Streptococcus alactolyticus strains LZMYFGM9 with the preservation number of CGMCC No.4227. The invention also provides a method for extracting total saponins of fermented Radix Astragali. The extraction method comprises the following steps: 1, carrying out warm immersion extraction on the fermented Radix Astragali by 80-90% ethanol, preferably 85% ethanol in order to obtain a fermented Radix Astragali alcohol extract fluid extract; 2, extracting the fermented Radix Astragali alcohol extract fluid extract obtained in step 1 by water saturated n-butanol in order to obtain an extract liquid; and 3, adding the extract liquid into a macro-porous adsorption resin column for absorption, euting, collecting the obtained eluate, and post-processing the eluate to obtain purified total saponins of the fermented Radix Astragali. The purity of saponins is further improved through the extraction method, and reaches 86-92%.

The invention relates to the field of agricultural chemical fertilizers, and specifically relates to a water-soluble compound nitrogen fertilizer. The water-soluble compound nitrogen fertilizer is characterized in that a formula is prepared from the following components: ammonium nitrate, ammonium sulfate, a pH regulator and an inner drying agent; the mass ratio of ammonium sulfate to ammonium nitrate is (60-40): (40-60); the compound nitrogen fertilizer contains 0.5 to 10% of pH regulator and 0.5 to 15% of inner drying agent based on the total mass of the compound nitrogen fertilizer. The preparation method comprises the steps of concentrating an ammonium nitrate solution; adding ammonium sulfate; controlling the reaction conditions to generate stable combined nitrogen complex salt; adding the pH regulator and the inner drying agent; further evaporating and concentrating; granulating and cooling to obtain the water-soluble compound nitrogen fertilizer. The water-soluble compound nitrogen fertilizer has the advantages of being explosion-proof, resistant to store, and scientific in mixing ratio; meanwhile, the water-soluble compound nitrogen fertilizer contains nitrate nitrogen, ammonium nitrogen and sulphur element, and is particularly suitable for various nitrophilous and thiophilic crops; the preparation method does not change the technological conditions of the existing ammonium nitrate neutralization reactor, and is stable to produce, and simple to operate.

The invention discloses a method for fractionation of lignocelluloses biomass components through a two-phase fused salt system. A molten salt hydrate-organic solution two-phase system is utilized to finish degradation and peeling of raw material hemicelluloses, swelling dissolution of cellulose and dissolution of lignin under a mild environment so as to break a compact structure of lignocelluloses, so that separation and extraction of all the components in the lignocelluloses biomass can be realized. The method is simple and practicable, is capable of separating the components of the lignocelluloses biomass under a lower temperature and is capable of effectively reducing energy consumption. The cellulose acquired according to the invention is locally decomposed poly-cellulose, has an amorphous structure and is easy for subsequent transformation and utilization.

A method for preparing a gadolinium-doped graphite-like carbon nitride photocatalytic material is disclosed. Gadolinium nitrate hexahydrate, melamine and ethylene glycol are used as main raw materials. The gadolinium-doped graphite-like carbon nitride photocatalytic material is prepared by solvothermal synthesis. The photocatalytic activity of the prepared material is tested by using visible light(lambda> 420 nm) as a light source. The excellent photocatalytic performance of the material under the visible light is proved by degrading of toxic organic pollutants such as methyl orange, rhodamine B and methylene blue in water. The composite material belongs to an inorganic photocatalytic material and has strong photocatalytic ability to degrade the organic pollutants, and the composite material has good application prospects in environmental protection and water pollution control, also has a broad development space in use of solar energy to develop and utilize new energy. The method hasthe advantages of simple preparation process and easy control of reaction conditions.

The invention discloses a method for performing surface treatment on a material for boosting cell growth and resisting biological pollution, which comprises the following steps: firstly, performing activating treatment on a material surface, and performing surface self-assembly reaction; and then fixing amphoteric-ion molecules and polyethylene glycol molecules with the characteristics of resisting biological pollution and extracellular matrix proteins or albumen polypeptides for boosting cell growth on the material surface in turn, thereby obtaining a material with the characteristics of boosting cell growth and resisting biological pollution. By performing surface treatment on the material according to the method provided by the invention, the material surface is simultaneously endowed with the capabilities of resisting biological pollution and boosting cell growth. The method is applied to the fields of biological materials, tissue engineering, nanometer material research, and the like.

The invention discloses a preparation method of gamma-copper iodide. The preparation method is characterized by including: dissolving elemental iodine into tetrafluoroborate and hexafluorophosphate ionic liquid, and controlling heating temperature to be 80-150 DEG C under a sealed state to completely dissolve the elemental iodine to obtain an iodine solution; placing a cleanly-polished copper sheet into iodine ion solution, heating under controlled temperature until the solution is nearly colorless, cooling to room temperature, taking out precipitate at the bottom of the solution, repeatedly washing with deionized water and ethanol, and performing vacuum drying to obtain the gamma-copper iodide. The preparation method is high in iodine utilization rate, low in cost, simple in operation process, environmentally friendly, free of pollution and high in product yield and purity.

The invention discloses a method for producing chlorobenzene and dichlorobenzene by catalytic distillation and degradation of hexachlorobenzene. The method adopts a fixing bed catalytic distillation tower to gradually remove chlorine on the hexachlorobenzene in a sectional catalytic hydrogenation manner, the hexachlorobenzene and hydrogen enter from the bottom of the fixing bed catalytic distillation tower, and preform a dechlorination reaction through a catalyst bed layer. As the boiling point of the generated product is gradually reduced, the product moves upwards and exits from the top of the tower. The composition of the product at the top of the tower can be controlled by controlling the catalyst and catalytic reaction conditions, so that the purity of the obtained dichlorobenzene andchlorobenzene can reach more than 99%.

The invention discloses a preparing method for a polystyrene microsphere loaded nano-copper composite material, belongs to the field of composite materials and aims at providing a method for preparing the polystyrene microsphere loaded nano-copper composite material through a liquid-phase reduction method. The method includes the following steps that an emulsion polymerization method is used for preparing polystyrene microspheres; then, concentrated sulfuric acid is added, even mixing is conducted, deionized water is used for dilution after a heating reaction, milk white suspending liquid is obtained, deionized water is used for washing the milk white suspending liquid till the milk white suspending liquid is neutral, and then deionized water is used for conducting ultrasonic dispersion; and then a CuSO4 solid is added for ultrasonic treatment for 1 hour, stirring is conducted while water-bath heating is conducted, a NaOH solution is added, even mixing is conducted, then a hydrazine hydrate solution is added, the reaction is continuously carried out for 0.5 h, the mixed solution is washed through distilled water and ethyl alcohol in sequence till no impurity exists in the mixed solution, and black powder is obtained through vacuum drying. The method is simple and fast, no surface active agent needs to be added, nano-copper particles on the surfaces of the polystyrene microspheres are distributed evenly, stability is high, and oxidation is not likely to happen.

The invention discloses preparation method and application of an ionic liquid functionalized smectite clay-SO3H-IL composite material. The preparation method comprises the following steps: 1) uniformly mixing and stirring smectite clay and deionized water to obtain a mixture 1; 2) adding a mercapto-containing preparation raw material 2 into the mixture, and performing mercapto grafting to obtain smectite clay-SH; 3) performing mercapto oxidation of the smectite clay-SH to obtain smectite clay-SO3H; 4) dispersing the smectite clay-SO3H powder in a sodium chloride solution to obtain smectite clay-SO3Na; 5) enabling the smectite clay-SO3Na to react with 1-methyl-3-(3-trimethoxysilylpropy)imidazolium chloride to obtain ionic liquid functionalized smectite clay-SO3Na-IL; 6) acidifying the ionicliquid functionalized smectite clay-SO3Na-IL to obtain the ionic liquid functionalized smectite clay-SO3H-IL composite material. The smectite clay-SO3H-IL composite material provided by the inventionis applied to the preparation of reducing sugar through biomass hydrolysis, showing good catalytic performance.

The invention provides an environment-friendly kitchen waste continuous treatment device comprising pretreatment equipment, a main reactor and waste gas treatment equipment. The pretreatment equipmentcomprises a solid filter device, an oil-water separation device and an organic waste crushing device, and the oil-water separation device is installed below the solid filter device; the organic wastecrushing device is installed at the discharging end of the solid filter device, and the outlet end of the organic waste crushing device is connected with the main reactor; the main reactor is internally provided with active aerobic cultures, as well as an aeration device, a temperature control device, a humidity control device and a material mixing device; the top of the other side of the main reactor is connected with the waste gas treatment equipment, and the bottom of one side of the main reactor is connected with a collecting device; and a gas outlet pipeline at the upper part of the waste gas treatment equipment extends out directly and communicates with outside. According to the environment-friendly kitchen waste continuous treatment device, high efficiency degradation of kitchen waste is achieved, and organic fertilizers are obtained; meanwhile, waste gas reaching the standard is discharged, so that harmless treatment and resource utilization are achieved.

The invention discloses a CO & CO2 co-methanation catalyst and a preparation method and application thereof. The CO & CO2 co-methanation catalyst comprises an active component, an auxiliary agent anda carrier. Compared with a traditional methanation catalyst with Al2O3 as a carrier, the CO & CO2 co-methanation catalyst has the advantages that the carrier is high in activity, good in low-temperature activity, high in toxicity resistance and the like. The CO & CO2 co-methanation catalyst is good in low-temperature activity, simple and easy to operate in preparation method, easy to control reaction conditions, cheap and easily available in raw materials and good in catalyst repeatability and has a good industrial application prospect.

The invention relates to a surfactant, and provides a biquaternary ammonium salt surfactant. A chemical name of the biquaternary ammonium salt surfactant is biquaternary ammonium salt dibromo N,N-bis(long-chain alkyl dimethyl)-3-oxa-1,5-pentanediamine. A synthetic method of the biquaternary ammonium salt surfactant comprises the following steps: (1) adding 0.1 mol of diethylamine into a three-necked flask with a stirrer and 2 dropping funnels, then respectively adding 0.05mol of dichloroethane and 0.05mol of sodium hydroxide solution with a weight/volume percent of 40 percent, and preparing tetraethylethylenediamine; and (2) adding bromododecane, tetraethylethylenediamine and absolute ethyl alcohol into the three-necked flask with a reflux condensation apparatus, recrystallizing, separating and purifying to obtain the biquaternary ammonium salt surfactant. By adopting the biquaternary ammonium salt surfactant, the problem that the biquaternary ammonium salt surfactant for producing a polyester fabric is uneasy to synthesize can be solved.

The invention provides a treatment technology for photocatalytically degrading dyestuff wastewater. A visible-light photocatalyst is an ion liquid modified perovskite covering type hydrotalcite photocatalyst. The catalyst takes perovskite covering type hydrotalcite with photocatalytic activity as a substrate; the catalyst is modified by ion liquid capable of improving the visible-light utilizationrate of the substrate and improving the photocatalytic activity; the ion liquid is 1-methyl-3aminopropylhexafluorophosphate. By adopting the treatment technology provided by the invention, the problem in the prior art that the degradation efficiency of the dyestuff wastewater is low is solved, and the treatment technology is suitable for degrading an organic dyestuff in a polluted water body.