초록 ▼

The present invention relates to a process for production of chlorine dioxide by reacting in a reaction vessel an alkali metal chlorate, sulfuric acid and a reducing agent, preferably methanol, in proportions to generate chlorine dioxide in a reaction medium maintained at a temperature from about 50

The present invention relates to a process for production of chlorine dioxide by reacting in a reaction vessel an alkali metal chlorate, sulfuric acid and a reducing agent, preferably methanol, in proportions to generate chlorine dioxide in a reaction medium maintained at a temperature from about 50°C. to about 100°C. and an acidity within the interval from 4.8 to 11 N and subjected to a subatmospheric pressure sufficient to effect evaporation of water. A mixture of chlorine dioxide and water vapour is withdrawn from an evaporation region in the reaction vessel and alkali metal sulfate is precipitated in a crystallization region in the reaction vessel. The alkali metal sulfate, which is an alkali metal sesquisulfate, from the crystallization region is heated to the formation of gaseous sulfur trioxide and a neutral alkali metal sulfate. The gaseous sulfur trioxide is absorbed in water to the formation of sulfuric acid. The sulfuric acid formed can be recirculated to the reaction vessel for chlorine dioxide production.

대표청구항 ▼

A process for production of chlorine dioxide, comprising the steps of: (a) reacting in a reaction vessel an alkali metal chlorate, sulfuric acid and a reducing agent in proportions to generate chlorine dioxide in a reaction medium maintained at a temperature of from about 50°C. to about 100°C., havi

A process for production of chlorine dioxide, comprising the steps of: (a) reacting in a reaction vessel an alkali metal chlorate, sulfuric acid and a reducing agent in proportions to generate chlorine dioxide in a reaction medium maintained at a temperature of from about 50°C. to about 100°C., having an acidity resulting in the formation of an alkali metal sulfate which consists of an alkali metal sesquisulfate and subjected to a subatmospheric pressure sufficient to effect evaporation of water; (b) withdrawing chlorine dioxide and water vapor from an evaporation region in the reaction vessel; (c) precipitating alkali metal sesquisulfate in a crystallization region of the reaction vessel; and (d) heating the precipitated alkali metal sesquisulfate to a temperature sufficient to form gaseous sulfur trioxide and a neutral alkali metal sulfate.