Production system of germanium tetrachloride for optical fiber

Abstract

The invention provides a production system of germanium tetrachloride for optical fiber. The production system of germanium tetrachloride for the optical fiber comprises at least two rectification units. The rectification units are connected with each other in series. Each of the rectification units comprises a rectifying still, a rectifying tower, a primary condensing tower, a secondary condensing tower, a discharging head, a primary exhaust gas absorption device, a secondary exhaust gas absorption device and a exhaust gas treatment device. The secondary exhaust gas absorption device is communicated with the primary exhaust gas absorption device. The exhaust gas treatment device is communicated with the secondary exhaust gas absorption device. The production system of germanium tetrachloride for the optical fiber improves the rectifying purity of the germanium tetrachloride for the optical fiber enormously by arranging a plurality of rectification units and improves the reliability of the sealing and maintains the pressure balance in the system by arranging the primary exhaust gas absorption device and the secondary exhaust gas absorption device and can evacuate the exhaust gas finally produced by the production system through the exhaust gas treatment device by arranging the exhaust gas treatment device.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a production system of germanium tetrachloride for optical fiber. Background technique [0002] Fiber-grade germanium tetrachloride is the main dopant of quartz-based optical fibers. It can increase the refractive index of optical fibers, reduce the attenuation of optical signals, and increase the transmission distance. It is one of the most important raw materials for manufacturing optical fibers. Therefore, the purity and quality requirements for fiber-grade germanium tetrachloride products are extremely high, requiring GeCl 4 Content ≥99.999999%, the total amount of metal impurities (Fe, Co, Cr, Mn, Cu, etc.) ≤5ppb, the total amount of hydrogen-containing impurities (OH, CH, HCl) ≤3ppm, or even lower. [0003] However, in the traditional production process of germanium tetrachloride for optical fiber, when the germanium tetrachloride solution is in contact with air,...

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Problems solved by technology

[0003] However, in the traditional production process of germanium tetrachloride for optical fiber, when the germanium tetrachloride solution is in contact with air, it will absorb moisture in the air and undergo a chemical reaction, producing a certain amount of HCl and other hydrogen-containing impurities, resulting in The purity of the obtained germanium tetrachloride is not high, and the existence of these impurities is the main cause of the absorption loss in the optical signal transmission process, which will directly affect the quality of the optical fiber

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