Method and system for the integral chlorine dioxide production with relatively independent sodium chlorate electrolytic production and chlorine dioxide production

A system for integral chlorine dioxide production with independent sodium chlorate electrolytic production and chlorine dioxide production, the system comprising:

• an electrolytic production unit for sodium chlorate (NaClO3) and a crystallization unit;
• a chlorine dioxide (ClO2) production unit;
• and
• a hydrochloric acid (HCl) synthesis unit,
• wherein
• the NaClO3 electrolytic production unit and crystallization unit comprise
• an electrolysis loop formed by connecting in series an electrolyzer, a degasifier, an electrolyte feed header, an electrolyte cooler, and a chlorine dioxide reactor,
• a NaClO3 crystallization unit formed by linking with pipelines an electrolyte storage tank, an electrolyte transit pump, an electrolyte buffer tank, an electrolyte transfer pump, an evaporator crystallizer, a sodium chlorate slurry pump, and a solid-liquid filter, and
• a sodium chlorate feeding system formed by linking with pipelines a sodium chlorate dissolve tank, a sodium chlorate transit pump, a sodium chlorate buffer tank, a sodium chlorate feed pump, and a sodium chlorate filter, wherein
• one end of the solid-liquid filter is connected with the chlorine dioxide reactor through pipelines and other end is connected with the sodium chlorate dissolve tank;
• and
• the ClO2 production unit comprise
• a generation system formed by a circulation loop with a heat generator, a lower circulation pipe, a chlorine dioxide generator, and an upper circulation pipe, pumping liquor with a circulation pump;
• a chlorine dioxide solution production unit formed by connecting in sequence via pipelines a generator exhaust pipe, an indirect cooler, a chlorine dioxide absorber, a tail gas fan, a liquid-gas separator, and a dilute chlorine dioxide solution cooler;
• a sodium chloride recycle system formed by linking in sequence a sodium chloride extraction pipe, a sodium chloride filter, a sodium chloride dissolve tank, a sodium chloride transit pump, and a sodium chloride buffer tank, the sodium chloride buffer tank is connected with the chlorine dioxide reactor through pipelines;
• and
• a HCl synthesis unit comprising
• a unit formed by connecting in sequence a hydrogen cooler, a hydrogen demister, a hydrochloric acid synthesis burner, a hydrochloric acid storage tank, and a hydrochloric feed pump, the hydrochloric acid feed pump is connected with the heat generator heater via pipelines, and the hydrogen cooler is connected with the chlorine dioxide reactor via one or more hydrogen exhaust pipes.