33results about How to "Will not cause decomposition" patented technology

The invention discloses a method for preparing hydroxypropyl-beta-cyclodextrin, which comprises the steps of etherification, neutralization, decoloring, nanofiltration, resin purification, and spray drying. The method of the invention is small in pollution, and the yield in weight is more than 80 percent; meanwhile, the product prepared by using the method of the invention is narrow in substituted ratio range and low in impurity content, and can be used as a pharmaceutic adjuvant.

The invention relates to the field of pharmaceutical engineering, in particular to a tiopronin sterile powder and a preparation and a preparation method thereof. The preparation method disclosed by the invention comprises the following steps of: adding an ethyl formate-dissolvable tiopronin raw material into an active carbon heat removing source for injection; adding ether or methyl tert-butyl ether for recrystallizing; and drying at a low temperature to obtain tiopronin sterile powder which is free from pyrogen and has high purity. The preparation method disclosed by the invention is easy and convenient to operate, and has high yield; and the obtained tiopronin sterile powder has high purity and safe and reliability quality, is suitable for preparing a tiopronin sterile powder injection, and can be widely applied to mass production of tiopronin sterile powder injections.

The invention relates to the field of pharmaceutics, specifically to cefmetazole aseptic powder and its preparation method. The preparation method comprises: employing a mixed solvent to recrystallize cefmetazole, using a good solvent to dissolve the cefmetazole raw material, adding activated carbon for injection to remove a pyrogen, then adding a poor solvent for recrystallization, and conducting drying at a low temperature, thus obtaining the cefmetazole aseptic powder with no pyrogen and high purity. Characterized by simple operation and high yield, the preparation method of the invention can prepare cefmetazole aseptic powder with high purity, safe and reliable quality, thus being suitable for preparing cefmetazole aseptic powder injections and widely applicable in large scale production of cefmetazole aseptic powder injections.

The invention discloses a desulphurization and denitrogenation hybrid reaction device and a desulphurization and denitrogenation integrated process. The reaction device comprises a device body, a reaction kettle and at least one smoke pipeline, wherein the reaction kettle and the smoke pipeline are arranged in the device body; a smoke inlet, a smoke outlet and an ozone inlet which are communicated with the reaction kettle are formed in the device body, and the reaction kettle is communicated with the smoke inlet through the smoke pipeline; and a closed first cooling medium channel is formed among the device body, the reaction kettle and the smoke pipeline, and a first cooling medium inlet and a first cooling medium outlet which are communicated with the first cooling medium channel are further formed in the device body. The desulphurization and denitrogenation integrated process comprises the steps of removing dust, exchanging heat, introducing ozone for reaction, and carrying out alkaline liquid absorption. The reaction device can be used for simultaneously carrying out heat exchange, desulphurization and denitrogenation, so that the waste heat in the smoke can be recycled, the heat exchange efficiency is high, and the ozonolysis caused due to the over-high temperature of smoke reacting with the ozone is avoided; and meanwhile, the desulphurization and denitrogenation efficiencies of the process are high.

The invention relates to an extraction method of stone coal extracted vanadium. The extraction method comprises the steps that firstly, stone coal is produced to be stone coal ore pulp through pre-treatment procedures of smashing-ore grinding by adding water; low-concentration hydrochloric acid serves as a leaching agent to firstly leach impurities such as potassium, calcium, magnesium and aluminum, and one-stage ore concentrate and one-stage immersion liquid are obtained; the one-stage ore concentrate is floated by using a regulating agent, an inhibitor and a collecting agent, and fuel carbonand vanadium ore concentrate are obtained; the vanadium ore concentrate is dehydrated, dried and ground to be powder, and the ore concentrate dry powder is produced; sulfuric acid serves as an adhesive, the ore concentrate dry powder is shaped and aged in the air; the aged pellet is salinized at the temperature of 200-330 DEG C, vanadium in the pellet is converted to be soluble vanadium sulfate,and a salinized pellet is obtained; and the salinized pellet is subjected to leaching by using water, and second-stage immersion liquid and leached slag are obtained. The leaching rate of vanadium canbe as high as 90-96%, and the industrialized application prospect is good.

The invention discloses a method for molding a long fiber-reinforced thermoplastic resin. The method comprises the following steps of feeding long fiber bundles into a screw extruder from a fiber feeding mouth located at a cylinder of the screw extruder, feeding a resin into the screw extruder from a hopper, uniformly mixing the long fiber bundles and the resin under the action of rotation of a screw of the screw extruder, and carrying out molding by a mold to obtain the long fiber-reinforced thermoplastic resin. Through compounding of the long fiber bundles and the thermoplastic resin in the screw extruder, the method realizes full dispersion and dipping of long glass fibers, does not have special requirements on resin viscosity, has a wide application range and is suitable for a thermally sensitive resin.

The invention relates to a method and a device for refining sulfoxide chloride. The method comprises the following steps: after rectifying a crude product generated in a sulfoxide chloride synthesis step, performing overvulcanization and condensation on the rectified light component, putting a liquid-phase component obtained through gas-liquid separation into a rectification cycle and putting a gas-phase component obtained through gas-liquid separation into a synthesis step cycle; condensing the gas-phase component generated after the rectified light component is subjected to first vacuum distillation and then putting the condensed gas-phase component into the synthesis step cycle, and performing second vacuum rectification on a heavy component; performing overvulcanization and condensation on the light component obtained by virtue of the second vacuum rectification, returning the liquid-phase component obtained through gas-liquid separation to the second vacuum rectification step cycle, and returning the heavy component to the rectification step cycle; putting the gas-phase components obtained in the two stages of vacuum rectification steps into the synthesis step cycle, respectively. According to the method, a tower system sequence is arranged reasonably, the easily decomposable components are separated under vacuum and at a controlled temperature, and the components difficult to separate are cyclically rectified, and therefore, the separation accuracy and the product quality are improved; after multi-stage rectification, the purity of sulfoxide chloride is above 99.9%.

The invention provides a frame-sealing glue composition which comprises a frame-sealing glue and micro-spheres scattered in the frame-sealing glue, wherein each of the micro-spheres comprises a closed first shell and a closed second shell; the second shell is located in the first shell; a cavity exists between the first shell and the second shell; a first matter is packaged in the cavity between the first shell and the second shell; a second matter is packaged in the second shell; when the pressure borne by the first shell and the second shell exceeds a preset pressure, the first shell and the second shell break, so as to cause the first matter to be in contact with the second matter; and the first matter reacts with the second matter by contacting, so as to release the heat for solidifying the frame-sealing glue. The invention also provides an opposite assembling method and a display panel. When the frame-sealing glue provided by the invention is used for bonding two base plates arranged for opposite assembling, no ultraviolet irradiation is required.

The invention discloses a trunk whitewashing composition, a trunk whitewashing agent containing the trunk whitewashing composition, and application. The composition is composed of hydroxypropyl methyl cellulose and an ethylene-vinyl acetate copolymer, wherein the weight percentage of vinyl acetate in the ethylene-vinyl acetate copolymer is 70 to 95%. In the trunk whitewashing agent, the mass percentage of the composition is 1 to 70%, and the rest components of the trunk whitewashing agent are accessory materials. All the components of the trunk whitewashing composition show substantial synergistic interaction; and the trunk whitewashing composition can effectively alleviate occurrence of phenomena like overwintering freeze injury, sunburning and sprouting and improves the growth conditions of plants. The composition or the trunk whitewashing agent containing composition has the advantages of environment friendliness of each component, stable quality, a small usage amount, a wide application scope and convenience and safety in application.

A plant extraction used for reconditioning of cellular polystyrene and its preparation method and assemblage are disclosed. It is produced by: grinding the leaves of Eucalyptus citriodora Hook, Eucalyptus exserta F.Muell, Eucalyptus robusta Smith, kandelia candel, rhizophora stylosa, mint herb, soaking with water, distilling, collecting the oil, preparing the combination of materials adding in the accessories and the water by dispersing at high rate. Its advantages include: innocuous, contamination free, converting the huge waste cellular polystyrene into small rapidly, reclaiming and utilizing easily, volatilizing easily so as not to pollute the reclaimed waste cellular polystyrene, less dosage, low cost, conveniently using without heating and compressing, not having the cellular polystyrene analyzing, having high purity of the reclaimed product.