A kind of method for separating chlorine gas from chlorine dioxide solution

Abstract

The invention discloses a method for separating chlorine gas from a chlorine dioxide solution. The method comprises the steps that: the chlorine dioxide solution containing chlorine gas is placed in asuction filtering device, hydrochloric acid is added dropwise to the solution to adjust the pH value of the solution to 2 to 5, vacuum filtration is performed for 8 to 12 minutes to precipitate chlorine gas, and after completion of filtration, a purified chlorine dioxide solution is obtained; and the chlorine dioxide solution containing the chlorine gas is prepared by an R6 method. The method forseparating the chlorine gas from the chlorine dioxide solution achieves high-efficiency separation of the chlorine gas in the chlorine dioxide solution, and obtains the high-purity chlorine dioxide solution by controlling temperature, pH, filtration pressure and the like of the chlorine dioxide solution. The separation effect is good, and no waste and waste acid emission exist. The separation method is simple and cost-effective, low in cost, good in separation effect, and fast in separation speed. The chlorine gas in the chlorine dioxide solution can be separated in large quantities. The method for separating the chlorine gas from the chlorine dioxide solution realizes industrial production, and has good social and economic benefits.

Description

technical field [0001] The invention relates to the technical field of chlorine dioxide preparation, in particular to a method for separating chlorine gas from a chlorine dioxide solution. Background technique [0002] Chlorine dioxide has a wide range of uses. It has been used in pulp and fiber bleaching at home and abroad; treatment of drinking water, hospital sewage, and industrial circulating cooling water; treatment of industrial waste; oil extraction; poultry production; aquaculture; plants, fruits and vegetables, and meat products. , Aquatic product insurance; indoor sanitation, disinfection and sterilization of food manufacturing, etc. The World Health Organization has listed it as a class A1, spectrum, and safe disinfectant. [0003] The preparation method of chlorine dioxide has been researched and developed for many years, and there are as many as ten kinds. It is mainly divided into two categories: electrolytic method and chemical method. The electrolysis meth...

AI Technical Summary

Problems solved by technology

Since the 1970s, foreign countries have successively developed a new method of electrolytically synthesizing chlorine dioxide using sodium chloride, sodium chlorate and sodium chlorite as electrolytes. This method requires a large investment in equipment and complicated processes, and has not yet been promoted.

But in the preparation process of chlorine dioxide, the by-product chlorine will be dissolved in the chlorine dioxide solution, which will inevitably generate a part of the adsorbable organic chloride when the chlorine dioxide solution is used for bleaching reaction, and because the adsorbable organic chloride Persistence / long-term persistence, bioaccumulation, high toxicity, semi-volatility and long-distance migration. As the total amount discharged into the natural environment continues to accumulate, the threat to the environment continues to increase

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