Preparation method of benzyl arsonic acid

• Main Authors: CHEN QIAN, HUANG YINGHONG, YANG DONGRONG, LIU HUIJIANG, WANG HUAIXING, DUAN MINGCHENG
• Format: Patent
• Language: Chinese; English
• Published: 26.02.2021
• Subjects: ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAININGELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN,SULFUR, SELENIUM OR TELLURIUM; CHEMISTRY; METALLURGY; ORGANIC CHEMISTRY

The invention relates to a preparation method of benzyl arsonic acid, which comprises the following steps: a) mixing alkali MOH and 60 to 200-mesh metal arsenic according to the molar ratio of 2-5: 1,heating to 320-370 DEG C, and reacting for 3-7 hours to obtain an arsenite; b) dissolving the arsenite obtained in the step a) with water, filtering, transferring a filtrate into a high-pressure reaction kettle, adding benzyl chloride and a phase transfer agent PTC, introducing inert gas or air, pressurizing to 1-5MPa, heating to 100-120 DEG C, and stirring to react for 8-15h; after the reactionis finished, cooling to normal temperature, adding acid into the high-pressure reaction kettle until the pH value is 1-3, and filtering, washing and drying materials in the high-pressure reaction kettle to obtain a benzyl arsonic acid product. Metal arsenic is used as a raw material, arsenite is prepared through alkalization, benzyl arsonic acid is synthesized through a high-pressure hydrothermalmethod, the conversion rate