73 results about "Chlorine doping" patented technology

The present invention relates to a low attenuation single-mode optical fiber and a preparation method thereof. The low attenuation single-mode optical fiber comprises a core layer and a cladding layer. The low attenuation single-mode optical fiber is characterized in that the radius r1 of the core layer is 3.5 to 4.0 micrometers, the relative refractive index difference Delta1 of the core layer is 0.33%to 0.36%, an inner cladding layer and an outer cladding layer are orderly coated from inside to outside outside the core layer, the radius r2 of the inner cladding layer is 12 to 14 micrometers, the relative refractive index difference Delta2 of the inner cladding layer is 0.01%to 0.01%, the radius r3 of the outer cladding layer is 62 to 63 micrometers, and the outer cladding layer is a pure silica glass layer. A core rod is manufactured through VAD process, the glass core rod with a germanium and chlorine doped core layer and a fluorine and chlorine doped inner cladding layer is obtained, the core rod is sleeved in a pure silica outer sleeve tube, or the outer cladding layer is deposited outside the core rod through OVD process, a prefabricated rod for drawing can be obtained, and the prefabricated rod is drawn in a drawing speed of 1500 to 3300 m/min to form an optical fiber. According to the low attenuation single-mode optical fiber and the preparation method, through doping chlorine, a core layer germanium doping amount is reduced and core layer and cladding layer viscosity matching is improved to realize the low attenuation of the optical fiber, and optical fiber preparation process is simple, the production cost is low, the process is stable, and the qualified rate of output is high.

The invention specifically discloses a high-stability ultralow-mercury catalyst, and a preparation method and application thereof, belonging to the field of catalysts. The preparation method for the ultralow-mercury catalyst comprises the following steps: mixing and molding carbon powder, sucralose and metal nitrate to obtain chlorine-doped defective activated carbon which is used as a carrier, and then loading mercury chloride on the carrier. The prepared ultralow-mercury catalyst is reduced in the content of mercury chloride and improved in catalytic performance and stability. The inventionalso discloses the application of the above ultralow-mercury catalyst to the preparation of vinyl chloride by using a calcium carbide method. The catalyst shows strong catalytic performance and stability in the process of catalytic preparation of vinyl chloride; and the conversion ratio of acetylene is 97.2% or above, the selectivity of vinyl chloride is 99.5% or above, and the loss rate of mercury chloride is less than 3.0%.