Production method of ammonium iodide

Abstract

A process for preparing ammonium iodide from iodine, Fe powder, and dicarbonate includes such steps as preparing ferrous iodide, reaction between ferrous iodide and dicarbonate to obtain ferrous carbonate, ammonium iodide, CO2 and water, separating ammonium iodide, removing SO4 radical, filtering, concentracting, and crystallizing. Its advantage is low corrosion to productive apparatus.

Description

technical field [0001] The present invention proposes a kind of new production method of ammonium iodide, specifically take iodine, iron powder, ammonium bicarbonate as the method for raw material production ammonium iodide. Background technique [0002] Ammonium iodide is white deliquescent tetragonal crystal, easily turns yellow when exposed to air, relative density 2.514, boiling point 220°C (in vacuum), decomposes and sublimes when heated (551°C), soluble in water, alcohol, acetic acid, ammonia , Slightly soluble in ether, photosensitive, used as a raw material for the manufacture of inorganic iodides, as photosensitive emulsions for photographic film and negative plates, and used in the pharmaceutical industry for the manufacture of expectorants and diuretics. Usually the production method of ammonium iodide has following two kinds: [0003] ① direct method [0004] Preparation of ammonium iodide with ammonia and iodine as raw materials in the pres...

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Problems solved by technology

[0006] The disadvantage of this method is: because liquid ammonia water and hydrogen peroxide are used, which are highly volatile, easily decomposed, and unstable substances, the reaction temperature is required to be higher than normal temperature, thereby increasing the volatilization of ammonia water, hydrogen peroxide, and iodine. As a result, production conditions such as: feeding ratio, feeding sequence, feeding times, interval time, and reaction temperature are difficult to control; the production environment is poor, and according to the safety limit requirements of chemical production workshops, NH 3 ≤30mg / m 3 , I 2 ≤1mg / m 3 , H 2 o 2 ≤1mg / m 3 , this requirement is difficult to meet in the production environment, and it will cause great harm to the production personnel in severe cases, and the safety is poor; if it is to be changed, it must be closed to react and absorb volatile gases, which will inevitably lead to an increase in production costs. Big

[0010] Its shortcoming is: this liquid ammonia, and properties such as hydroiodic acid (HI) are unstable, volatile, corrosive determine poor operating environment; The instability and corrosiveness of hydroiodic acid also determine the complex process of producing and preparing hydroiodic acid , requires special corrosion-resistant special equipment for production, and often requires anti-corrosion treatment, resulting in high cost