Preparation purification method of germanium tetrachloride for optical fiber

Abstract

The invention provides a preparation purification method of germanium tetrachloride for optical fibers, which adopts germanium concentrate as a raw material; hydrochloric acid, sulfuric acid, and ferric trichloride are added into a chlorination reaction vessel according to a certain proportion for reaction to prepare crude germanium tetrachloride; the crude germanium tetrachloride is fully mixed with hydrochloric acid and manganese dioxide according to a certain proportion in a repeated distillation reaction vessel for distillation and purification to obtain preliminarily purified germanium tetrachloride; the germanium tetrachloride after repeated distillation purification is processed in a quartz rectifying tower in inert atmosphere by controlling a tower bottom temperature to be 75-95 DEG C, a tower column temperature to be 30-95 DEG C, and a reflux ratio of 4:1-14:1, so as to obtain high-purity germanium tetrachloride. The high-purity germanium tetrachloride prepared through three procedures of chlorination distillation, repeated distillation, and rectification purification, has a content of transition metal impurities of less than 3 ppb, a content of hydrogen-containing impurities of less than 1 ppm, and meets the requirements for perform rod germanium tetrachloride for optical fibers.

Description

Technical field [0001] The invention belongs to the technical field of chemical engineering, and specifically relates to a preparation and purification method of germanium tetrachloride for optical fiber. Background technique [0002] Optical fiber communication is the most advanced communication technology in the world today. Optical fiber communication has the advantages of large capacity, bandwidth, anti-interference, strong confidentiality and reliability, good stability, low loss, small size, light weight, low cost, and long relay distance. Germanium tetrachloride is one of the key basic materials for the manufacture of communication optical fibers. In the manufacture of optical fibers, germanium tetrachloride is an important dopant in the production of optical fiber preforms. Its function is to increase the refractive index of the fiber core and reduce optical loss. , Thereby increasing the transmission distance of the optical fiber. Therefore, the requirements for the pu...

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Problems solved by technology

Although this method uses high-concentration lye, a small amount of GeCl4 will still be hydrolyzed to generate GeO2, which will reduce the total amount of GeCl4 and lower production efficiency.

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