40results about How to "Adjust the reaction temperature" patented technology

The invention relates to a water separation recovery device for preparing a polycarboxylic acid type water-reducer macromonomer, including a water separator, a liquid mixing pipe, a return pipe and adischarge pipe, the discharge pipe is arranged at the bottom part of the water separator, the liquid mixing pipe is arranged at the top part of the water separator, the return pipe is arranged at theupper-middle position of the water separator, the lower part of the discharge pipe is connected with a material discharging three-way valve, the material discharging three-way valve is respectively connected with a solvent recovery pipe, an automatic water drainage pipe and a water discharge pipe, the other end of the solvent recovery pipe is connected with a dehydration molecular sieve device, the other end of the automatic water drainage pipe is connected with a water collecting barrel, a solvent recovery valve, an automatic water drainage valve and a water discharge valve are respectively arranged on the solvent recovery pipe, the automatic water drainage pipe and the water discharge pipe, and the lower part of the dehydration molecular sieve device is connected with a solvent dischargepipe and a solvent discharge valve. The device is visible and convenient in operation and comprises the solvent recovery and recycling device, which has higher production efficiency.

The invention relates to a preparation method of polysiloxane with a specific content of vinyl groups. The preparation method concretely comprises the following steps: adding 50-300mg of a dewatered hexamethylcyclotrisioxane monomer and 100-1000m of 1,3,5-trivinyl-1,3,5-trimethylsiloxane monomer to a 5ml new distilled tetrahydrofuran solvent, add 10 drops of an n-butyl lithium solution, reacting at 40DEG C for 20h, adding frozen anhydrous methanol for end group termination, allowing a polymer to precipitate, centrifuging, and carrying out rotary evaporation on the obtained precipitate to obtain polysiloxane with special content of vinyl groups. The polymerization process can be controlled through a controllable anionic ring opening polymerization reaction by changing a monomer feeding ratio, adjusting the reaction temperature, increasing or decreasing the reaction time and adding a chain termination agent in order to realize the regulation and control of the monomer conversion rate, the molecular weight and the vinyl group content.

The invention discloses a synthesis method of nanorod-shaped AlPO4-15, and belongs to the field of nanomaterials. The method comprises the following steps: 1, dissolving an aluminum salt in water to prepare an aluminum salt solution with the concentration of 0.8-3mol / L; 2, adding urea to the aluminum salt solution according to a molar ratio of the aluminum salt to urea of 4:1-15:1, and stirring for 10-60min; 3, adding phosphate to a solution obtained in step 2 according to a molar ratio of Al:P of 1:1, and stirring for 10-60min; and 4, transferring a solution obtained in step 3 to a hydrothermal reaction kettle, reacting at 130-160DEG C for 30-72h, filtering after the reaction ends, washing the obtained filter cake, and drying to obtain nanorod-shaped AlPO4-15 powder. AlPO4-15 nanorods are formed through self-assembling under hydrothermal synthesis conditions by changing the content of urea, prolonging the reaction time and adjusting the reaction temperature.

The invention provides a preparation method of Naftopidil. In the presence of reaction solvent, a reflux reaction is carried out between 3-(1-naphthoxy)-1,2-propylene epoxide and o-methoxyphenyl piperazine hydrobromide, and then refined processing is carried out after the reaction, wherein, the reaction solvent is trichloromethane or dichloromethane; and the alkali matter is potassium carbonate water solution. The method in the invention improves the yield, improves the reaction yield to about 80% from the original 55-65%; and the refined products are white or almost white crystals, and the product quality accords with the medicinal requirement.

The invention discloses polyferric sulfate as well as a preparation method and a preparation device of the polyferric sulfate. The preparation method comprises the following steps: conveying the following components into a mixing tank in percentage by weight: 40 percent to 50 percent of iron sulfate heptahydrate and 60 percent to 50 percent of titanium dioxide waste sulfuric acid, and blending the materials; adjusting the concentration range of the titanium dioxide waste sulfuric acid H2SO4 to be 21 percent to 23 percent to obtain mixed reaction materials; conveying the reaction materials into a reaction tower, and adding a sulfate composite rare-earth solution as a reaction cocatalyst when conveying the reaction materials into the reaction tower; controlling the temperature in the reaction tower to be 40 DEG C to 60 DEG C; after all the blended materials enter the reaction tower, adding a sodium nitrite solution as a reaction catalyst; continually introducing oxygen gas into the reaction tower so that the oxygen gas and the reaction materials make oxidization, hydrolysis and polymerization reactions under the action of the cocatalyst and the catalyst; after effectively converting Fe<2+> ions in the materials into Fe<3+> ions, obtaining liquid polyferric sulfate. With the adoption of the polyferric sulfate as well as the preparation method and the preparation device of the polyferric sulfate, the production efficiency can be greatly improved, environmental hazards are reduced, and a more prominent water purification and coagulation effect is realized.