31results about How to "Few control conditions" patented technology

The invention provides a method for preparing ordered manganese oxides. 1) Take a certain amount of saturated oxalic acid solution; 2) Add manganese nitrate to the oxalic acid solution at a ratio of 3-5 mmol of manganese nitrate per 0.1L of saturated oxalic acid solution, and stir on a magnetic stirrer to make a uniform Mix the solution; 3) magnetically stir at room temperature until a large amount of precipitation appears; 4) wash the precipitate obtained in 3) with alcohol and distilled water several times in sequence to obtain a precursor; 5) dry the precursor at 80°C; 6) dry the The dry precursor was ground into a fine powder and calcined at 800°C for 6 hours to obtain the product. The shape of the product obtained by the method of the invention is close to a rod shape, and is arranged in order to form a large sheet. The synthesis cost is low, the synthesis steps are few, the operation is simple, the reaction conditions are mild, environmental protection and energy saving, the conditions to be controlled are few and easy to implement, and it is very promising to be applied to large-scale production.

The invention discloses a tubular continuous production technology for generating six-membered heterocyclic compounds by means of dehydration cyclization, particularly N-((2Z)-piperazine-2-subunit)-2, 2, 2-trifluoroacetyl hydrazine (1) by taking 5-trifluoromethyl-2-chloromethyl methyl ether-1, 3, 4-NBD-F as a raw material in the presence of ethidene diamine. The channelized method for continuously producing 1 comprises the following steps of: firstly, putting methanol solution of ethidene diamine into one storage tank, putting the methanol solution of raw material NBD-F into the other storage tank, and keeping at a proper temperature T1; directly charging the methanol solution in the two storage tanks into a tubular reactor according to a certain proportion, and controlling the reaction temperature in the tubular reactor at T2, and the reaction time at t; and charging the obtained reaction liquid into a crystallization kettle to be cooled to separate out white solid. The synthesis technology provided by the invention has the advantages of being simple in device, good in technological safety, mild in reaction conditions, easy to control, continuous in production, environment-friendly, high in yield, stable in product quality and the like.

The invention provides a method for synthesizing cellulose derivatives with long alkoxy side chains. (1) Using the triphosgene method to synthesize phenyl isocyanate with long alkoxy side chains based on aniline and triphosgene; (2) Using microcrystalline cellulose as a substrate, introducing long alkoxy side chains into cellulose by esterification In the main chain, cellulose phenyl carbamate derivatives with long alkoxy side chains were synthesized. The invention has clear and feasible synthesis route, mature process, simple operation, few conditions to be controlled and easy realization, and can be used for large-scale batch production.

The invention discloses a phenolic resin wastewater processing method and a special-purposed device. The phenolic resin wastewater processing method comprises the following steps: phenolic resin wastewater is mixed with Ca(OH)2, and a pH value is regulated to 10-12; a coagulation and sedimentation reaction is carried out; a pH value is regulated to 3-5; a Fenton reaction is carried out; a pH value is regulated to 7-10, and solid-liquid separation is carried out; a hydrolytic acidification-anaerobic fermentation process is carried out; a contact oxidation reaction is carried out; and secondary sedimentation is carried out. The special purposed device comprises the sequentially connected components of: a wastewater feeding tank, a coagulation and sedimentation reaction rank with a first feeder, a Fenton reaction device with a second feeder, a solid-liquid separation device with a third feeder, a hydrolytic acidification tank, an anaerobic fermentation tank, a contact oxidation reaction rank with an aeration device, and a secondary sedimentation tank. With the processing method, pollutant content in the processed wastewater reaches a discharge standard. The operation is simple, control conditions are less, and cost is low.

A controllable synthesis method of highly stereoregular polymethyl methacrylate, comprising the following steps: Step 1: using amylose as a matrix raw material, and using 3,5-dimethylphenylisocyanate as a derivatization reagent, by The traditional esterification method synthesizes the helical polymer amylose-three (3,5-dimethylphenylcarbamate); step 2: the synthesized amylose-three (3,5- Dimethylphenylcarbamate) was added as an additive to the radical polymerization reaction of methyl methacrylate, and its regular helical structure was used to induce the radical polymerization behavior of methyl methacrylate, and finally prepared a highly stable Stereoregular polymethyl methacrylate; the invention has clear and feasible synthetic route, mature process, simple operation, few conditions to be controlled and easy realization, and can be used for large-scale batch production.

The invention discloses a method for accelerating adult Tachypleus tridentatus sexual maturity and cultivation system using the method. The method accelerates the adult Tachypleus tridentatus sexual maturity by controlling the water level and water flow of a cultivation pond to simulate the tidal phenomenon of the natural environment. The cultivation system comprises the cultivation pond, a micro-filter, a low-level reservoir, a water pump, a biological filter tank, a protein separator, an ozone sterilizer, an ultraviolet sterilizer and a high-level reservoir which are sequentially connected through pipelines and is characterized in that the high-level reservoir is connected with the cultivation pond through a pipeline; a water quality monitoring device I is mounted on the low-level reservoir, and a water quality monitoring device II and a temperature control device are mounted on the high-level reservoir; coral sand is laid on the bottom of the cultivation pond. The method is few in control conditions, simple to operate and good in effect. The circulating-water cultivation system is capable of avoiding the poor water quality problem of existing cultivation manners, and the problemof appendage abrasion of adult Tachypleus tridentatus during movement in the cement pond is solved by laying the coral sand on the bottom of the cultivation pond.

The invention provides a controllable synthesis method of stereoregular polymethyl methacrylate, step 1: using microcrystalline cellulose as a matrix raw material, and using 3,5-dimethylphenylisocyanate as a derivatization reagent, Synthesize the helical polymer cellulose-tri(3,5-dimethylphenylcarbamate) by traditional esterification method; Base carbamate) was added as a chiral inducer in the free radical polymerization of methyl methacrylate, and stereoregular polymethyl methacrylate was finally prepared. The synthesis route of the present invention is clear and feasible, the process is mature, the operation is simple, the conditions that need to be controlled are few and easy to realize, and can be used for large-scale batch production, the source of cellulose, methyl methacrylate and azobisisobutyronitrile used in the present invention It is widely available, cheap and easy to obtain, and the whole synthesis process is simple, mature and easy to control.

The invention belongs to the technical field of production of metatitanic acid through titanium dioxide slurry, and particularly relates to a production method and equipment for producing metatitanic acid through titanium dioxide slurry.The production method for producing metatitanic acid through the titanium dioxide slurry is characterized by comprising the following steps of 1 diluting; 2 reacting by adding alkali; 3 reacting by adding acid; 4 water washing; 5 recycling; 6 spin-drying; 7 drying; 8 milling; 9 packaging.The production equipment for producing metatitanic acid through the titanium dioxide slurry is characterized by comprising reacting washing equipment (1), a supernatant liquor vertical flow sedimentation device (2), a delivery pump (3), a spin-drying device (4), a drying device (5) and a ball mill.According to the production method and equipment, few technological steps and few control conditions are needed, the equipment structure is simple, operation is convenient, reacting is complete, and the recycling rate and quality of metatitanic acid are guaranteed.

The invention provides cobaltate conversion liquid and application in surface treatment of a magnesium-lithium alloy. The cobaltate conversion liquid of the magnesium-lithium alloy is prepared by taking cobalt nitrate as main salt, sodium nitrite and hydrogen peroxide as double promoters and sodium acetate, sodium citrate and sodium gluconate as auxiliary additives. A brown cobaltate conversion film can be formed on the surface of the magnesium-lithium alloy by utilizing the cobaltate conversion liquid to treat the magnesium-lithium alloy. The film is compact, even and smooth, does not have obvious pits or peelings, has good binding force with the matrix of the magnesium-lithium alloy and has moderate thickness. The method has low preparation cost, fewer preparation steps, simple operation, moderate reaction conditions, environmental protection, energy saving and fewer conditions required to be controlled and is easy to realized; compared with a chromate conversion film, the corrosionresisting property of the cobaltate conversion film is greatly improved, and thereby, the cobaltate conversion film is very hopeful to be applied to large-scale production.

The invention provides a method for preparing magnesium lithium alloy cerium salt and molybdate-phosphate-zirconium fluoride conversion coating, which comprises: subjecting the magnesium lithium alloy to degreasing, pickling and activating; performing conversion by cerium salt for 10 to 15 minutes in cerium salt conversion solution under conditions of a pH value of 3 to 4 and a temperature of 40 DEG C, and forming a layer of rare earth conversion coating on the surface of the magnesium lithium alloy; and immersing in molybdate-phosphate-zirconium fluoride conversion solution to perform conversion for 12 to 15 minutes under conditions of a pH value of 3.7 to 3.8 and a temperature of 50 to 55 DEG C. The method has better anticorrosion effect and is environment friendly; the bonding force between the conversion coating and the substrate is high; the color of the conversion film is uniform; the anticorrosion performance is high; and the obtained molybdate-phosphate-zirconium fluoride conversion solution has high recycling value and long service life and can be better reduce production and application cost.

The invention provides magnesium-lithium alloy molybdate and phosphate conversion solution and a method for forming a conversion coating. The magnesium-lithium alloy molybdate and phosphate conversion solution is prepared from sodium molybdate serving as main salt, monosodium phosphate serving as secondary main salt, citric acid serving as a coordinating agent, sodium fluoride serving as an accelerator, sodium nitrate serving as an accelerating agent, and glacial acetic acid serving as a pH regulator. By using the magnesium-lithium alloy molybdate and phosphate conversion solution to treat a magnesium-lithium alloy, the formed molybdate-phosphate coating has high surface coverage degree on the magnesium-lithium alloy, is uniform and dense, and greatly improves the corrosion resistance of the matrix. The magnesium-lithium alloy molybdate and phosphate conversion solution and the method for forming the conversion coating have the advantages of simple and practicable process, short coating time, low cost, little influence on fatigue property of the magnesium-lithium alloy, low requirement on matrix materials, and no influence of the matrix materials.

The invention belongs to the technical filed of production of metatitanic acid from titanium dioxide slurry and particularly relates to a reacting and washing process and equipment for production of metatitanic acid from the titanium dioxide slurry. The reacting and washing process for production of metatitanic acid from the titanium dioxide slurry is characterized by comprising the following steps: A, dilution; B, alkali-added reaction; C, acid-added reaction; D, washing. The reacting and washing equipment for production of metatitanic acid from the titanium dioxide slurry is characterized by comprising a washing tank (1), a stirring device (2), a liquid absorbing device (3), an alkali liquor tank (4), an acid liquor tank (5) and a water tank (6). The process comprises a few steps and a few control conditions, the equipment is simple in structure and convenient to operate, reactions are sufficient, and the recovery rate and quality of metatitanic acid precipitates are guaranteed.

The invention belongs to the field of processing, and specifically relates to novel suspension type freeze concentration equipment. The novel suspension type freeze concentration equipment provided by the invention comprises a scraper type heat exchanger, a liquid distribution disc, an ice scraping device, an ice crystal carrying tank, a heavy crystallizing tank, an ice crystal delivery pipe, an ice discharging tank and a material supplying tank, wherein the lower end of the scraper type heat exchanger is connected with the upper end of the ice crystal carrying tank, and the lower end of the ice crystal carrying tank is connected with the upper end of the heavy crystallizing tank; the upper part of the heavy crystallizing tank is communicated with the ice discharging tank through a guiding pipe, the bottom or side surface of the heavy crystallizing tank is communicated with one end of a pipeline I with a pump a, and the other end of the pipeline I is connected with the top of the scraper type heat exchanger so as to form a material liquid circulating system. The novel suspension type freeze concentration equipment provided by the invention has the characteristics that the energy consumption is low, a scraper is not easy to clamp, the concentration efficiency is high, the operation is simple, few controlling conditions are required, and the production efficiency is high, and thus the novel suspension type freeze concentration equipment is beneficial for mass production application.