4results about "Chlorous acid" patented technology

The application discloses a kind of waste-free acid sodium chlorite production process in the field of inorganic chemical materials green preparation technology, process uses new multi-level pore-dual functional site composite modified material, the material is prepared by mesoporous silica base synthesis, metal oxide loading, amino functional group modification and limited calcination four-stage gradient process, with catalytic reaction, adsorption acid impurity and solid-liquid separation function.Employing sodium chlorate, methanol, sulfuric acid as raw material, after the raw material is matched into solution, it is reacted with modified material in reaction kettle, temperature is controlled to 60-62 DEG C reaction;After reaction, temperature is lowered and solid-liquid is separated, filter cake is washed and dried, and then material is recycled;High-purity sodium chlorite solution is obtained by nanofiltration membrane separation of filtrate, sodium sulfate is recovered by evaporation crystallization of intercept liquid and concentrated sulfuric acid is recycled, and sodium chlorite crystal is obtained by crystallization and drying of permeate liquid.The process realizes waste-free acid discharge, reaction time is short, efficiency is high, product purity reaches superior product standard, material can be recycled, and it is environment-friendly.

The utility model discloses a sodium chlorite concentration device which comprises a reaction kettle, a first cavity and a second cavity are formed in the reaction kettle, the second cavity surrounds the first cavity, a vacuumizing valve is arranged at the top of the first cavity, the upper portion of the first cavity is connected with one end of an air guide pipe, and the other end of the air guide pipe communicates with a liquid storage cavity. The gas guide pipe is coated with a condensation assembly, a heating rod is arranged in the second cavity, a temperature sensor is installed in the second cavity, the temperature sensor is electrically connected with the microcontroller, and the microcontroller is electrically connected with a control switch of the heating rod; heat is transferred by heating water, so that heating equipment is not in direct contact with a sodium chlorite solution, the risk of equipment corrosion is reduced, the contact area between the hot water and the first cavity is increased, the solution in the first cavity is heated uniformly, local overheating is avoided, the water temperature is adjusted through the microcontroller, and the evaporation temperature of the solution is controlled; the concentration efficiency of the sodium chlorite solution is improved.

Provided herein are apparatus and methods for production of a chlorite salt, e.g., sodium chlorite, based on purification by recrystallization to achieve the desired purity.

To provide a novel method for producing chlorous acid water that can stably maintain chlorous acid in water for extended periods. [Solution] A method for maintaining chlorous acid (HClO2) stably in water for a long period of time by trapping (capturing or adsorbing) chlorine dioxide gas (ClO2) with an inorganic acid, inorganic acid salt, organic acid, or organic acid salt, either individually or in combination with two or more of these, thereby creating a transition state and slowing down the decomposition reaction. For example, a gas cleaning device 2 is filled with H2O, NaOH, and H2O2 as a gas cleaning liquid, chlorine dioxide gas is prepared in a chlorine dioxide gas storage tank 3, sodium carbonate, dipotassium hydrogen phosphate, and sodium tetraborate are filled in a chlorous acid water production tank 1, and an air pump 4 is operated to introduce chlorine dichloride into the chlorous acid water production tank 1 to produce chlorous acid water.