Method and device for removing arsenic in hydrogen fluoride

• Main Authors: LIU TONG, LIN HAIXIA, HUANG YING, JIANG YUHU, YIN YUELING, LI XIN, JIA JINGSHAN, LIU HAIFANG
• Format: Patent
• Language: Chinese; English
• Published: 13.10.2023
• Subjects: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; COMPOUNDS THEREOF; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; THEIR RELEVANT APPARATUS; TRANSPORTING

The invention relates to a method for removing arsenic in hydrogen fluoride, which comprises the following steps: feeding a hydrogen fluoride raw material to the upper part of a fluorination reactor through a liquid inlet, feeding fluorine-nitrogen mixed gas to the lower part of the fluorination reactor through a gas inlet, and reacting the fluorine-nitrogen mixed gas with arsenic in the hydrogen fluoride raw material to generate mixed liquid A and mixed gas B, the liquid A flows back to the top of the fluorination reactor through a circulating pump; treating the mixed gas B through a condenser, condensing to obtain hydrogen fluoride liquid, refluxing the hydrogen fluoride liquid into the fluorination reactor, and discharging the condensed gas; and after the reaction is finished, stopping feeding the fluorine-nitrogen mixed gas, enabling the mixed liquid A to enter a subsequent rectification and purification stage, removing arsenic in the hydrogen fluoride in the rectification and purification stage, and reco