3results about How to "High space-time yield" patented technology

This invention belongs to the field of polymer synthesis and microchemical technology, and discloses a method for synthesizing hydroxyl-terminated polybutadiene in a continuous flow microchannel reactor. The preparation method includes mixing butadiene, anhydrous ethanol, 30% hydrogen peroxide, and an antioxidant under nitrogen protection to obtain a raw material liquid, which is then pumped into the microchannel reactor via a high-pressure metering pump. The mixture undergoes preheating initiation and polymerization reactions sequentially, with viscosity monitored by an online viscometer. After the reaction, the product is obtained through gas-liquid separation, sedimentation and stratification, washing, vacuum solvent removal, and filtration. This invention utilizes a microchannel reactor, which provides precise temperature control and stable pressure. Segmented temperature control and online viscosity adjustment prevent reactor blockage, resulting in high product conversion and yield, and uniform molecular weight distribution. By adding auxiliary devices to optimize the process, continuous and stable production is achieved, making it more efficient, environmentally friendly, and controllable.

The application discloses a supported metal element synergistically modified copper-based catalyst and a preparation method and application thereof. The catalyst is composed of metal copper, metal gallium, an auxiliary element M and a carrier SiO2. In the preparation method, a Cu-Ga catalyst precursor is prepared through an ammonia evaporation method, and then the auxiliary element is added through ball milling. Mechanical shearing force and impact generated in the milling process can promote sufficient contact and uniform mixing of the auxiliary element and the precursor, so that the auxiliary element is more uniformly distributed and a strong interaction is formed. Under the condition that the hydrogen ester ratio is about 200, the application can still maintain a high methyl 3-hydroxypropionate conversion rate and 1,3-propanediol selectivity.

The invention discloses a method for simultaneously preparing vinylidene fluoride and vinyl fluoride, which comprises the following step of: reacting difluoroethane under the action of a catalyst and oxidizing gas to prepare the vinylidene fluoride and the vinyl fluoride, the catalyst comprises an active component and a carrier compound, the active component comprises an active component A, or the active component comprises an active component A and an active component B; the active component A is selected from at least one of molybdenum salt, lanthanum salt, nickel salt, chromium salt, vanadium salt, platinum salt or palladium salt; the active component B is selected from at least one of sodium salt, potassium salt, cesium salt, magnesium salt or calcium salt. According to the method, difluoroethane is taken as a raw material, and vinylidene fluoride and vinyl fluoride are prepared at the same time under the action of a catalyst and oxidizing gas.