Preparation method of stable-state chlorine dioxide solution of food additive

Abstract

The invention discloses a preparation method of a stable-state chlorine dioxide solution of a food additive. The method comprises the following steps of: (1) preparing a sodium chlorate aqueous solution, extracting the sodium chlorate aqueous solution into a reaction kettle which is provided with an opening tube by using a water jet vacuum system, and heating to 50 to 60 DEG C; (2) diluting a concentrated sulphuric acid, mixing the concentrated sulphuric acid and methanol into a sulphuric acid methanol solution, and adding the sulphuric acid methanol solution into the reaction kettle in the step (1) for reaction; (3) supplying power by using the water jet vacuum system, cooling chlorine dioxide gas which is generated by the reaction in the step (2) by using a water cooler, and then carrying out further separation and purification in a gas liquid separator; and (4) preparing an absorption solution by adding water into the sodium carbonate of the food additive, sodium hydroxide and hydrogen peroxide, and absorbing the chlorine dioxide gas which is obtained in the step (3) by the absorption solution by using a two-stage absorption tower. The method has the advantages that: the process is feasible, short in flow, simple in operation, low in energy consumption and applicable to preparation of the stable-state chlorine dioxide solution of the food additive which meets an international standard under the conditions of all scales.

Description

technical field [0001] The invention relates to a preparation method of chlorine dioxide, in particular to a preparation method of a stable chlorine dioxide solution used as a food additive. Background technique [0002] Chlorine dioxide is a yellow-green gas at room temperature. Its oxidizing ability is very strong. Its unique sterilizing, bleaching, and deodorizing capabilities have been certified by a large number of experiments and have been widely used in various industries, such as hospitals and laboratory environments. Bactericides and defoggers, disinfectants for food processing equipment, food additives (flour bleach, preservatives for fruit, vegetable and aquatic product processing), etc. However, because gaseous chlorine dioxide is very active, extremely unstable, flammable and explosive, although it is easily soluble in water and can be made into an unstable aqueous solution, it will dissociate about 2% to 10% per day at room temperature. It is not easy to store...

AI Technical Summary

Problems solved by technology

[0003] Existing chlorine dioxide preparation method is a lot, but does not see the method for specially preparing food additive stable chlorine dioxide solution

The widely used R8 method reacts under high negative pressure (absolute pressure 0.016Mpa) and high temperature (70-80°C). The process is long, the equipment is complicated, and the one-time investment is high. The concentration of chlorine dioxide produced is low, which is not suitable for food Requirements for additive stable chlorine dioxide solution; Chinese patent application "A method for producing high-concentration stable chlorine dioxide" (application number 92100534.2 published on August 13, 1993) The reaction is not stable, and violent spraying is prone to occur in the reactor , is not easy to control, and the reaction temperature is high (75-80°C), the volatilization of methanol is relatively large, and the concentration of methanol in the chlorine dioxide solution product produced is easy to exceed the standard and does not meet the food safety standards; Chinese patent application "a kind of stable carbon dioxide Although the production method disclosed in "Production Method of Chlorine" (Application No. 96107956.8 published on February 26, 1997) reacts at low temperature (less than 50°C), the reaction system is controlled at normal pressure, and the gaseous product is difficult to overcome the transportation The physical adsorption of the filler, the chemical purification of the stock solution and the flow resistance of the entire absorption process are low in production efficiency; high-purity chlorine dioxide gas can be obtained by directly acidifying the raw material of sodium chlorite, but the raw material cost is high, and due to the stable state Chlorine dioxide solution exists in the form of sodium chlorite salt of chlorine dioxide in essence, so the circulation of sodium chlorite raw material -> chlorine dioxide gas -> stable chlorine dioxide solution (sodium chlorite form) The reaction process is also uneconomical from an economic point of view

Images