12 results about "Reflux" patented technology

The invention relates to a full-automatic floor mopping machine. The full-automatic floor mopping machine includes a shell, a control chip, a walking part, a washing part and a floor mopping part; thefloor mopping part includes driving rolls parallelly arranged and a floor mopping ring belt which sleeves the driving rolls, and the outer surface of the floor mopping ring belt is provided with floor mopping lint; the washing part is connected with the shell through a lifting rod structure; the washing part includes a washing cavity and a filter cavity, the washing cavity is internally providedwith a washing machine, and a washing port is formed in the bottom plate of the washing cavity and directly faces the floor mopping lint; a reflux port communicated with the filter cavity is formed inthe side wall of the washing cavity; the horizontal height of the filter cavity is smaller than that of the washing cavity, and a filter and a diversion pump are arranged in the filter cavity. The floor mopping machine is novel in structure and unique in principle, and can intelligently clean the floor and automatically wash and replace mopping cloth; meanwhile, water stain exuding during stopping is effectively prevented, the cleanliness and tidiness of the floor are ensured, and the floor is effectively prevented from being soaked by water stain.

The invention discloses a purification method of 1,2-propylene amide. One from dihydric alcohol having 2-5 carbon atoms and triatomic alcohol having 2-5 carbon atoms or one from alcohol amines having 2-5 carbon atoms or dimethylsulfoxide or N-methyl-2-pyrrolidone is used as an extraction agent. A crude product of the 1,2-propylene amide and the extraction agent enter an extraction tower for extraction, then water are collected at tower top of the extraction tower. Kettle bottom material of the extraction tower enters a rectifying tower for rectification, then the 1,2-propylene amide is collected at tower top of the rectifying tower. Through use of the method, the 1,2-propylene amide and the water are separated in the process of preparation. Through use of the extraction agent, height of the tower and reflux ratio can be decreased and separation efficiency is enhanced. The extraction agent can be reused through simple separation, so that the energy consumption is greatly reduced and the production cost is also reduced. The method has the advantage of high separation efficiency, high purity of purification products, colorless and transparent products, and recycling extraction agent.

The invention discloses a pretreatment device for wastewater reuse. The device comprises a shell, wherein a water inlet is formed at the upper end of the shell; a water draining pipe is arranged at the lower end of the shell; a reflux device is arranged on the water draining pipe; a second filtering film is arranged in the water draining pipe; a motor and a control switch are arranged on the upper surface of the shell; the motor is electrically connected with the control switch. The pretreatment device for wastewater reuse firstly treats the wastewater in the manner of multi-level filtering, can save time for the subsequent wastewater treatment and can prolong the service life of the related device in the subsequent treatment link; a sewage draining port which is capable of being manually opened and closed is formed on the device; the sewage draining port is under a closed state in a filtering process, so that the sewage can be more sufficiently filtered; the sludge in the sewage can be discharged after the filtering is ended, so that the preparation for the filtering at the next time can be made; a stirring device is arranged for continuously stirring the wastewater in a filtering process, preventing wastewater lamination and blocking, so that the filtering efficiency is increased; the reflux device is arranged for further increasing the efficiency of wastewater treatment.

The invention discloses a preparation method of graphene quantum dots. The method comprises the following steps: a. adding pyrene into concentrated nitric acid, carrying out a condensation reflux reaction at 80 DEG C for 24-48 h, adding excess deionized water after the reaction is completed and performing suction filtration by using a filter membrane, performing repeated suction filtration and washing until the pH of a solution is neutral, and then placing the reaction product in a vacuum oven for oven-drying at 65 DEG C-85 DEG C to obtain trinitropyrene; b. weighing trinitropyrene and sodiumsulfite and performing dissolving in ethanol and performing uniform stirring, transferring the solution into a reaction kettle with a polytetrafluoroethylene substrate, and carrying out a reaction ata high temperature of 180 DEG C-210 DEG C for 10 h-12 h; and c. filtering the reaction product through a 0.22 [mu]m filter membrane to remove unreacted particles after the high temperature reaction iscompleted, then performing purification by a column chromatography separation method, and performing drying to obtain a yellow-brown solid powder, namely the graphene quantum dots. The hydrophobic graphene quantum dots prepared by the method can detect water content in organic solvents according to changes of fluorescence, and carry out cell imaging.

The invention relates to a detection method of mannitol in cordyceps fungus powder (Cs-4). The method comprises the steps of 1, preparation of a test substance solution, wherein an appropriate amountof cordyceps fungus powder (Cs-4) is taken, weighed precisely and added into an ethanol solution, the mixture is weighed, heated for reflux, cooled and weighed again, lost weight is supplemented by the ethanol solution, filtering is performed, an appropriate amount of subsequent filtrate is taken and placed in an evaporation dish, the subsequent filtrate is subject to decompression drying to be almost dry, residues are dissolved into a volumetric flask through a mobile phase and pass through a 0.45-micron micropore filtering membrane, and subsequent filtrate is taken to serve as the test substance solution; and 2, preparation of a reference substance solution, wherein an appropriate quantity of D-mannitol reference substances is taken, weighed precisely and dissolved by adding the mobile phase, and the reference substance solution is obtained; and 3, determination, wherein the reference substance solution and the test substance solution are sucked respectively and precisely and injected into a liquid chromatograph, a chromatogram is obtained through determination, and the content of D-mannitol (C<6>H<14>O<6>) is calculated according to the chromatogram.

The invention provides a method for extracting ethyl vanillate from peony. According to the method, peony petals are used as a raw material. Through heating reflux, an active component containing ethyl vanillate are extracted from peony petals; and through extraction, macroporous resin column chromatography, silica gel column chromatography and recrystallization, ethyl vanillate is obtained. By the method for extracting ethyl vanillate from peony, ethyl vanillate with high purity can be obtained, and the purity can reach 95% and above. During the extraction process of ethyl vanillate, medicines used in the process are all common medicines, and production cost is low. Meanwhile, organic solvents such as ethanol and macroporous resin in the chromatographic column can be repeatedly used. Thus, the environment is not polluted, and production cost is further reduced. The method of the invention is suitable for large-scale promotion and application. The ethyl vanillate obtained by the method has stronger activity than orlistat and can be applied in preparation of diet pills or a medicine with inhibitory effect on lipase activity.

The invention belongs to the technical field of biochemical engineering and discloses a 1-carboxy alkyl-4-nitroimidazole preparation method and the application of the method. 6-bromohexanoic acid and thionyl chloride are mixed by a molar ratio of 1:1.5, and reflux reaction is carried out on the 6-bromohexanoic acid and the thionyl chloride, and compound methyl 6-bromohexanoate is prepared; 2-methyl-4- nitroimidazole and sodium hydride are dissolved in DMF by a molar ratio of 1:1.2, the compound 6-methyl 6-bromohexanoate with the same molar weight as the 2-methyl-4- nitroimidazole is added into the DMF to prepare 2-methyl-4-nitryl-1-(6-carboxyl hexyl) imidazate; the imidazate is hydrolyzed in a sodium hydroxide aqueous solution to prepare 1-carboxy alkyl-4-nitroimidazole. According to the method, the synthesis steps are simple and effective, the product is high in purity after being identified, and the requirement for immune research on nitroimidazole drugs of China can be met.

The invention relates to refining methods of polymer materials and in particular relates to a method for refining a poly(ether-ketone-ketone) crude product by using a hydrochloric acid water solution of oxalic acid. The refining method comprises the following steps: firstly carrying out reflux stirring on a certain amount of poly(ether-ketone-ketone) crude product in a water solution containing dimethyl sulfoxide; and then adding the hydrochloric acid water solution of oxalic acid, carrying out reflux stirring and carrying out filtration after cooling; then carrying out reflux washing with a mixed water solution of glycolic acid and formic acid and carrying out filtration and drying, thus obtaining the poly(ether-ketone-ketone) pure product. Poly(ether-ketone-ketone) molecular chains tightly wrapping catalyst impurities can be unfurled by utilizing the poly(ether-ketone-ketone) swelling characteristic of the water solution containing dimethyl sulfoxide, so that impurity ions are exposed and diffused into media, and meanwhile, metal ions are continuously trapped by utilizing the metal ion chelating characteristic of oxalic acid under acidic conditions, thus achieving efficient removal of Al<3+> in the poly(ether-ketone-ketone) crude product.