CN108975276B - Method for separating chlorine from chlorine dioxide solution - Google Patents
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Abstract
The invention discloses a method for separating chlorine from chlorine dioxide solution, which comprises the steps of putting chlorine dioxide solution containing chlorine into a suction filtration device, dripping hydrochloric acid into the solution, adjusting the pH value of the solution to 2-5, then carrying out reduced pressure suction filtration for 8-12min to separate out chlorine, and obtaining purified chlorine dioxide solution after the suction filtration is finished; the chlorine dioxide solution containing chlorine is prepared by adopting an R6 method; the method realizes the high-efficiency separation of the chlorine in the chlorine dioxide solution by controlling the temperature, the pH value, the suction filtration pressure and the like of the chlorine dioxide solution, obtains the high-purity chlorine dioxide solution, has good separation effect, does not discharge waste and waste acid, has simple operation, low cost, good separation effect and high separation speed, can separate the chlorine in the chlorine dioxide solution in large batch, realizes industrial production, and has good social benefit and economic benefit.
Description
Technical Field
The invention relates to the technical field of chlorine dioxide preparation, in particular to a method for separating chlorine from chlorine dioxide solution.
Background
The chlorine dioxide has wide application, and is applied to the bleaching of paper pulp and fiber at home and abroad; treating drinking water, hospital sewage and industrial circulating cooling water; treating industrial three wastes; oil exploitation; producing poultry and livestock; aquaculture; insurance of plants, fruits and vegetables, meat products and aquatic products; indoor sanitation, disinfection and sterilization in food manufacturing, and the like. World health organization has listed it as a grade a1, spectrally safe disinfectant.
The preparation method of chlorine dioxide is researched and developed for many years, and the preparation method is more than ten. The main classification is two main categories: electrolytic and chemical processes. The electrolysis method is to electrolyze sodium chlorate obtained by brine electrolysis to directly react with hydrochloric acid in a device to generate chlorine dioxide. Since the 70 s, new methods for synthesizing chlorine dioxide by electrolyzing sodium chloride, sodium chlorate and sodium chlorite serving as electrolytes have been developed in foreign countries, and the method has large equipment investment, complex process and no popularization at present. At present, a chemical method is a mainstream method for preparing chlorine dioxide, and an R6 method in the chemical method is also called a comprehensive method, so that the method is a clean and environment-friendly production process with low production cost, no solid waste discharge and no waste acid discharge, and is one of the most widely applied methods.
The comprehensive method for preparing chlorine dioxide comprises three main synthesis units, namely NaClO3Synthesis unit, HCl synthesis unit and ClO2And a synthesis unit. ClO2The synthesis unit is to generate sodium chloride, chlorine dioxide, chlorine and water by reacting chlorate and hydrochloric acid, wherein the hydrochloric acid is used as a reducing agent and an acid medium for reaction, and the reaction formula is as follows:
NaClO3+2HCl—ClO2+l/2Cl2+H20+NaCl
the chlorine dioxide is prepared by a comprehensive method, and the mixed gas of the chlorine dioxide from the reactor contains a large amount of chlorine, and 0.5mol of chlorine is generated when every 1mol of chlorine dioxide is obtained. In view of a series of environmental health problems caused by the use of chlorine, the chlorine in the mixed gas must be effectively separated to improve the purity of chlorine dioxide, so that the mixed gas can be transported to the next process for use.
The organic pollutant of pulping and papermaking process is mainly from the bleaching section of the pulping system, and adsorbable organic chloride is the most main persistent organic pollutant generated in the bleaching process, and the main source of the adsorbable organic pollutant is the chlorination reaction of residual lignin in unbleached pulp and chlorine-containing bleaching agent. Although pulping and papermaking enterprises currently bleach paper pulp by adopting an element-free chlorine bleaching technology mainly comprising chlorine dioxide, the generation amount of adsorbable organic chloride in bleaching waste water can be reduced, and the unification of environmental, economic and social benefits is realized. However, during the preparation process of chlorine dioxide, the by-product chlorine is dissolved in the chlorine dioxide solution, which results in the inevitable generation of a part of adsorbable organic chloride when the chlorine dioxide solution is used for bleaching, and as adsorbable organic chloride has persistent/long-term residue, bioaccumulation, high toxicity, semi-volatility and long-distance migration, the environmental threat is increased as the total amount of adsorbable organic chloride discharged into the natural environment is accumulated continuously.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a method for separating chlorine from a chlorine dioxide solution.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the method for separating chlorine from chlorine dioxide solution comprises the steps of putting chlorine dioxide solution containing chlorine into a suction filtration device, dropwise adding hydrochloric acid into the solution, adjusting the pH value of the solution to be 2-5, then carrying out reduced pressure suction filtration to separate out chlorine, wherein the suction filtration time is 8-12min, and obtaining purified chlorine dioxide solution.
Preferably, the chlorine dioxide solution containing chlorine is prepared by the R6 method.
Preferably, the chlorine dioxide solution containing chlorine is prepared as follows: sodium chlorate obtained by electrolyzing sodium chloride and hydrochloric acid are put into a chlorine dioxide generator to react to generate mixed gas of chlorine and chlorine dioxide gas, and the mixed gas is absorbed by water to obtain chlorine dioxide solution containing the chlorine.
Preferably, the molar ratio of the sodium chlorate to the hydrogen chloride in the hydrochloric acid is 1: 2.1-2.3.
Preferably, the chlorine dioxide solution containing chlorine gas contains 12.24-16.41% of the total mass of the solute.
Preferably, the chlorine dioxide solution containing chlorine gas contains 14.63% of the total mass of the solute.
Preferably, the molar concentration of the hydrochloric acid is 0.08-0.12 mol/L.
Preferably, when the chlorine dioxide solution is subjected to vacuum filtration, the pressure of the filtration is controlled to be-95-0 kPa, and the temperature of the chlorine dioxide solution is controlled to be 10-25 ℃.
Preferably, the suction filtration device is a glass sand core solvent filter.
Preferably, the separated chlorine gas can be collected and sent to a hydrochloric acid synthesis system for producing hydrochloric acid.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
the invention realizes the high-efficiency separation of chlorine in the chlorine dioxide solution by controlling the temperature, pH, suction filtration pressure and the like of the chlorine dioxide solution, obtains the high-purity chlorine dioxide solution, has good separation effect, does not discharge waste and waste acid, and can be used for producing hydrochloric acid. The method has good separation effect, reduces the production cost of high-purity chlorine dioxide, can reduce the generation amount of adsorbable organic chloride in bleaching waste water by using the purified chlorine dioxide solution for paper pulp bleaching, reduces the pollution of the adsorbable organic chloride to the natural environment, and realizes the unification of environmental, economic and social benefits.
The chlorine gas separation method has the advantages of simple operation, low cost, good separation effect and high separation speed, can be used for separating the chlorine gas in the chlorine dioxide solution in a large scale, realizes industrial production, and has good social benefit and economic benefit.
Drawings
Fig. 1 is a graph showing the ratio of chlorine dioxide to the total solute content before and after purification of the chlorine dioxide solutions of examples 1-12.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to preferred embodiments. It should be noted, however, that the numerous details set forth in the description are merely for the purpose of providing the reader with a thorough understanding of one or more aspects of the present invention, which may be practiced without these specific details.
Example 1
Putting 100ml of chlorine dioxide solution which contains chlorine and the chlorine content of which accounts for 14.63 percent of the total mass of the solute into a glass sand core solvent filter, dropwise adding hydrochloric acid with the concentration of 0.08mol/L into the solution, adjusting the pH value of the solution to be 5, then carrying out vacuum filtration for 10min to separate out the chlorine, controlling the pressure of the vacuum filtration to be 0kPa, controlling the temperature of the solution during the vacuum filtration to be 25 ℃, obtaining purified chlorine dioxide solution after the vacuum filtration is finished, wherein the chlorine dioxide content of the purified solution accounts for 87.39 percent of the total mass of the solute; the separated chlorine can be collected and sent to a hydrochloric acid synthesis system for producing hydrochloric acid;
the chlorine dioxide solution for suction filtration is prepared by adopting an R6 method, and the preparation method comprises the following steps: sodium chlorate obtained by sodium chloride electrolysis and hydrochloric acid are put into a chlorine dioxide generator according to the molar ratio of 1:2.1 to react to generate mixed gas of chlorine and chlorine dioxide gas, and the mixed gas is absorbed by water to obtain chlorine dioxide solution containing chlorine.
Example 2
Putting 200ml of chlorine dioxide solution which contains chlorine and the chlorine content of which accounts for 12.24 percent of the total mass of the solute into a glass sand core solvent filter, dropwise adding hydrochloric acid with the concentration of 0.09mol/L into the solution, adjusting the pH value of the solution to be 4.7, then carrying out vacuum filtration for 12min to separate out the chlorine, controlling the vacuum filtration pressure to be-9.5 kPa, controlling the temperature of the solution during the vacuum filtration to be 23 ℃, obtaining purified chlorine dioxide solution after the vacuum filtration is finished, wherein the chlorine dioxide content of the purified solution accounts for 89.80 percent of the total mass of the solute; the separated chlorine can be collected and sent to a hydrochloric acid synthesis system for producing hydrochloric acid;
the chlorine dioxide solution for suction filtration is prepared by adopting an R6 method, and the preparation method comprises the following steps: sodium chlorate obtained by sodium chloride electrolysis and hydrochloric acid are put into a chlorine dioxide generator according to the molar ratio of 1:2.12 to react to generate mixed gas of chlorine and chlorine dioxide gas, and the mixed gas is absorbed by water to obtain chlorine dioxide solution containing chlorine.
Example 3
Putting 300ml of chlorine dioxide solution which contains chlorine and the chlorine content of which accounts for 16.41 percent of the total mass of the solute into a glass sand core solvent filter, dropwise adding hydrochloric acid with the concentration of 0.10mol/L into the solution, adjusting the pH value of the solution to be 4.4, then carrying out vacuum filtration for 11.6min to separate out the chlorine, controlling the pressure of the vacuum filtration to be-19 kPa, controlling the temperature of the solution during the vacuum filtration to be 22 ℃, obtaining purified chlorine dioxide solution after the vacuum filtration is finished, wherein the chlorine dioxide content of the purified solution accounts for 88.64 percent of the total mass of the solute; the separated chlorine can be collected and sent to a hydrochloric acid synthesis system for producing hydrochloric acid;
the chlorine dioxide solution for suction filtration is prepared by adopting an R6 method, and the preparation method comprises the following steps: sodium chlorate obtained by electrolyzing sodium chloride and hydrochloric acid are put into a chlorine dioxide generator according to the molar ratio of 1:2.14 to react to generate mixed gas of chlorine and chlorine dioxide gas, and the mixed gas is absorbed by water to obtain chlorine dioxide solution containing chlorine.
Example 4
Putting 400ml of chlorine dioxide solution which contains chlorine and the chlorine content of which accounts for 12.21 percent of the total mass of the solute into a glass sand core solvent filter, dropwise adding hydrochloric acid with the concentration of 0.11mol/L into the solution, adjusting the pH value of the solution to be 4.1, then carrying out vacuum filtration for 11.4min to separate out the chlorine, controlling the pressure of the vacuum filtration to be-28.5 kPa, controlling the temperature of the solution during the vacuum filtration to be 21 ℃, obtaining purified chlorine dioxide solution after the vacuum filtration is finished, wherein the chlorine dioxide content of the purified solution accounts for 91.65 percent of the total mass of the solute; the separated chlorine can be collected and sent to a hydrochloric acid synthesis system for producing hydrochloric acid;
the chlorine dioxide solution for suction filtration is prepared by adopting an R6 method, and the preparation method comprises the following steps: sodium chlorate obtained by electrolyzing sodium chloride and hydrochloric acid are put into a chlorine dioxide generator according to the molar ratio of 1:2.16 to react to generate mixed gas of chlorine and chlorine dioxide gas, and the mixed gas is absorbed by water to obtain chlorine dioxide solution containing chlorine.
Example 5
Putting 500ml of chlorine dioxide solution which contains chlorine and the chlorine content of which accounts for 12.38 percent of the total mass of the solute into a glass sand core solvent filter, dropwise adding hydrochloric acid with the concentration of 0.11mol/L into the solution, adjusting the pH value of the solution to be 4.1, then carrying out vacuum filtration for 11.4min to separate out the chlorine, controlling the pressure of the vacuum filtration to be-28.5 kPa, controlling the temperature of the solution during the vacuum filtration to be 21 ℃, obtaining purified chlorine dioxide solution after the vacuum filtration is finished, wherein the chlorine dioxide content of the purified solution accounts for 92.75 percent of the total mass of the solute; the separated chlorine can be collected and sent to a hydrochloric acid synthesis system for producing hydrochloric acid;
the chlorine dioxide solution for suction filtration is prepared by adopting an R6 method, and the preparation method comprises the following steps: sodium chlorate obtained by electrolyzing sodium chloride and hydrochloric acid are put into a chlorine dioxide generator according to the molar ratio of 1:2.16 to react to generate mixed gas of chlorine and chlorine dioxide gas, and the mixed gas is absorbed by water to obtain chlorine dioxide solution containing chlorine.
Example 6
Putting 600ml of chlorine dioxide solution which contains chlorine and the chlorine content of which accounts for 12.45 percent of the total mass of the solute into a glass sand core solvent filter, dropwise adding hydrochloric acid with the concentration of 0.12mol/L into the solution, adjusting the pH value of the solution to be 3.8, then carrying out vacuum filtration for 11min to separate out the chlorine, controlling the vacuum filtration pressure to be minus 38kPa, controlling the temperature of the solution during the vacuum filtration to be 20 ℃, obtaining purified chlorine dioxide solution after the vacuum filtration is finished, wherein the chlorine dioxide content of the purified solution accounts for 93.19 percent of the total mass of the solute; the separated chlorine can be collected and sent to a hydrochloric acid synthesis system for producing hydrochloric acid;
the chlorine dioxide solution for suction filtration is prepared by adopting an R6 method, and the preparation method comprises the following steps: sodium chlorate obtained by electrolyzing sodium chloride and hydrochloric acid are put into a chlorine dioxide generator according to the molar ratio of 1:2.18 to react to generate mixed gas of chlorine and chlorine dioxide gas, and the mixed gas is absorbed by water to obtain chlorine dioxide solution containing chlorine.
Example 7
Putting 700ml of chlorine dioxide solution which contains chlorine and the chlorine content of which accounts for 14.89 percent of the total mass of the solute into a glass sand core solvent filter, dropwise adding hydrochloric acid with the concentration of 0.11mol/L into the solution, adjusting the pH value of the solution to be 3.4, then carrying out vacuum filtration for 10.6min to separate out the chlorine, controlling the pressure of the vacuum filtration to be 47.5kPa, controlling the temperature of the solution during the vacuum filtration to be 19 ℃, obtaining purified chlorine dioxide solution after the vacuum filtration is finished, wherein the chlorine dioxide content of the purified solution accounts for 94.86 percent of the total mass of the solute; the separated chlorine can be collected and sent to a hydrochloric acid synthesis system for producing hydrochloric acid;
the chlorine dioxide solution for suction filtration is prepared by adopting an R6 method, and the preparation method comprises the following steps: sodium chlorate obtained by electrolyzing sodium chloride and hydrochloric acid are put into a chlorine dioxide generator according to the molar ratio of 1:2.2 to react to generate mixed gas of chlorine and chlorine dioxide gas, and the mixed gas is absorbed by water to obtain chlorine dioxide solution containing chlorine.
Example 8
Putting 800ml of chlorine dioxide solution which contains chlorine and the chlorine content of which accounts for 15.12 percent of the total mass of the solute into a glass sand core solvent filter, dropwise adding hydrochloric acid with the concentration of 0.1mol/L into the solution, adjusting the pH value of the solution to be 3.1, then carrying out vacuum filtration for 10.2min to separate out the chlorine, controlling the pressure of the vacuum filtration to be-57 kPa, controlling the temperature of the solution during the vacuum filtration to be 18 ℃, obtaining purified chlorine dioxide solution after the vacuum filtration is finished, wherein the chlorine dioxide content of the purified solution accounts for 95.81 percent of the total mass of the solute; the separated chlorine can be collected and sent to a hydrochloric acid synthesis system for producing hydrochloric acid;
the chlorine dioxide solution for suction filtration is prepared by adopting an R6 method, and the preparation method comprises the following steps: sodium chlorate obtained by electrolyzing sodium chloride and hydrochloric acid are put into a chlorine dioxide generator according to the molar ratio of 1:2.22 to react to generate mixed gas of chlorine and chlorine dioxide gas, and the mixed gas is absorbed by water to obtain chlorine dioxide solution containing chlorine.
Example 9
Putting 900ml of chlorine dioxide solution which contains chlorine and the chlorine content of which accounts for 15.92 percent of the total mass of the solute into a glass sand core solvent filter, dropwise adding hydrochloric acid with the concentration of 0.09mol/L into the solution, adjusting the pH value of the solution to be 2.7, then carrying out vacuum filtration for 9.5min to separate out the chlorine, controlling the pressure of the vacuum filtration to be 66.5kPa, controlling the temperature of the solution during the vacuum filtration to be 17 ℃, obtaining purified chlorine dioxide solution after the vacuum filtration is finished, wherein the chlorine dioxide content of the purified solution accounts for 96.75 percent of the total mass of the solute; the separated chlorine can be collected and sent to a hydrochloric acid synthesis system for producing hydrochloric acid;
the chlorine dioxide solution for suction filtration is prepared by adopting an R6 method, and the preparation method comprises the following steps: sodium chlorate obtained by electrolyzing sodium chloride and hydrochloric acid are put into a chlorine dioxide generator according to the molar ratio of 1:2.24 to react to generate mixed gas of chlorine and chlorine dioxide gas, and the mixed gas is absorbed by water to obtain chlorine dioxide solution containing chlorine.
Example 10
Putting 1000ml of chlorine dioxide solution which contains chlorine and the content of which accounts for 16.23 percent of the total mass of solute into a glass sand core solvent filter, dropwise adding hydrochloric acid with the concentration of 0.08mol/L into the solution, adjusting the pH value of the solution to be 2.4, then carrying out vacuum filtration for 9min to separate out the chlorine, controlling the pressure of the vacuum filtration to be-77 kPa, controlling the temperature of the solution during the vacuum filtration to be 16 ℃, obtaining purified chlorine dioxide solution after the vacuum filtration is finished, wherein the content of the chlorine dioxide solute in the purified solution accounts for 97.67 percent of the total mass; the separated chlorine can be collected and sent to a hydrochloric acid synthesis system for producing hydrochloric acid;
the chlorine dioxide solution for suction filtration is prepared by adopting an R6 method, and the preparation method comprises the following steps: sodium chlorate obtained by electrolyzing sodium chloride and hydrochloric acid are put into a chlorine dioxide generator according to the molar ratio of 1:2.26 to react to generate mixed gas of chlorine and chlorine dioxide gas, and the mixed gas is absorbed by water to obtain chlorine dioxide solution containing chlorine.
Example 11
Putting 1100ml of chlorine dioxide solution which contains chlorine and the chlorine content of which accounts for 14.74 percent of the total mass of the solute into a glass sand core solvent filter, dropwise adding hydrochloric acid with the concentration of 0.09mol/L into the solution, adjusting the pH value of the solution to be 2.2, then carrying out vacuum filtration for 8.6min to separate out the chlorine, controlling the pressure of the vacuum filtration to be-86.5 kPa, controlling the temperature of the solution during the vacuum filtration to be 15 ℃, obtaining purified chlorine dioxide solution after the vacuum filtration is finished, wherein the chlorine dioxide content of the purified solution accounts for 97.94 percent of the total mass of the solute; the separated chlorine can be collected and sent to a hydrochloric acid synthesis system for producing hydrochloric acid;
the chlorine dioxide solution for suction filtration is prepared by adopting an R6 method, and the preparation method comprises the following steps: sodium chlorate obtained by electrolyzing sodium chloride and hydrochloric acid are put into a chlorine dioxide generator according to the molar ratio of 1:2.28, and react to generate mixed gas of chlorine and chlorine dioxide gas, and the mixed gas is absorbed by water to obtain chlorine dioxide solution containing chlorine.
Example 12
Putting 5000ml of chlorine dioxide solution which contains chlorine and contains 13.59 percent of the total mass of solute in a glass sand core solvent filter, dropwise adding hydrochloric acid with the concentration of 0.1mol/L into the solution, adjusting the pH value of the solution to be 2, then carrying out vacuum filtration for 8min to separate out the chlorine, controlling the pressure of the vacuum filtration to be-95 kPa, controlling the temperature of the solution during the vacuum filtration to be 15 ℃, obtaining purified chlorine dioxide solution after the vacuum filtration is finished, wherein the content of the chlorine dioxide in the purified solution is 98.09 percent of the total mass of solute; the separated chlorine can be collected and sent to a hydrochloric acid synthesis system for producing hydrochloric acid;
the chlorine dioxide solution for suction filtration is prepared by adopting an R6 method, and the preparation method comprises the following steps: sodium chlorate obtained by electrolyzing sodium chloride and hydrochloric acid are put into a chlorine dioxide generator according to the molar ratio of 1:2.3 to react to generate mixed gas of chlorine and chlorine dioxide gas, and the mixed gas is absorbed by water to obtain chlorine dioxide solution containing chlorine.
Chlorine removal effect of chlorine dioxide solution
The chlorine dioxide solution containing chlorine provided by embodiments 1-12 of the present invention and the separation method provided by the corresponding embodiments have the separation effect shown in table 1 and fig. 1.
| Examples | 1 | 2 | 3 | 4 | 5 | 6 |
| Before purification/% | 84.37 | 85.72 | 81.54 | 83.72 | 85.47 | 85.50 |
| After purification/% | 87.39 | 89.80 | 88.64 | 91.65 | 92.75 | 93.19 |
| Increase/%) | 3.02 | 4.08 | 7.10 | 7.93 | 7.28 | 7.69 |
| Examples | 7 | 8 | 9 | 10 | 11 | 12 |
| Before purification/% | 83.02 | 82.38 | 82.05 | 81.74 | 84.20 | 85.29 |
| After purification/% | 94.86 | 95.81 | 96.75 | 97.67 | 97.94 | 98.09 |
| Increase/%) | 11.84 | 13.43 | 14.70 | 15.93 | 13.74 | 12.80 |
Table 1 ratio of chlorine dioxide to total solute before and after purification of chlorine dioxide solution
As shown in table 1 and fig. 1, the separation method of the present invention realizes efficient separation of chlorine in chlorine dioxide solution by controlling temperature, pH, suction filtration pressure, etc. of chlorine dioxide solution, and obtains high-purity chlorine dioxide solution with good separation effect, and without discharge of waste and waste acid, and the separated chlorine can be used for production of hydrochloric acid.
Claims (8)
1. A method for separating chlorine from chlorine dioxide solution is characterized in that chlorine dioxide solution containing chlorine is placed in a suction filtration device, hydrochloric acid is dripped into the solution, the pH value of the solution is adjusted to be 2-5, then reduced pressure suction filtration is carried out to separate out chlorine, and the suction filtration time is 8-12min, so as to obtain purified chlorine dioxide solution;
when the chlorine dioxide solution is subjected to vacuum filtration, the pressure of the filtration is controlled to be-95-0 kPa, and the temperature of the chlorine dioxide solution is controlled to be 10-25 ℃.
2. A method for separating chlorine gas from a chlorine dioxide solution as claimed in claim 1, wherein the chlorine dioxide solution containing chlorine gas is prepared by the R6 method.
3. A method for separating chlorine gas from a chlorine dioxide solution as claimed in claim 2, characterized in that the chlorine dioxide solution containing chlorine gas is prepared by the following method: sodium chlorate obtained by electrolyzing sodium chloride and hydrochloric acid are put into a chlorine dioxide generator to react to generate mixed gas of chlorine and chlorine dioxide gas, and the mixed gas is absorbed by water to obtain chlorine dioxide solution containing the chlorine.
4. A method for separating chlorine gas from a chlorine dioxide solution as claimed in claim 3, characterized in that the molar ratio of sodium chlorate to hydrogen chloride in hydrochloric acid is 1: 2.1-2.3.
5. A method for separating chlorine gas from a chlorine dioxide solution as claimed in any one of claims 1 to 3, wherein the chlorine dioxide solution containing chlorine gas has a chlorine gas content of 12.24 to 16.41% by mass of the total solute.
6. A method for separating chlorine gas from a chlorine dioxide solution as claimed in claim 5, wherein the chlorine dioxide solution containing chlorine gas has a chlorine gas content of 14.63% by mass of the total solute.
7. A method for separating chlorine gas from a chlorine dioxide solution as claimed in claim 1, wherein the hydrochloric acid has a molar concentration of 0.08-0.12 mol/L.
8. The method for separating chlorine gas from a chlorine dioxide solution as claimed in claim 1, wherein said suction filtration device is a glass sand core solvent filter.
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| CN1261051A (en) * | 1999-01-15 | 2000-07-26 | 山东工业大学 | Process for preparing stable ClO2 solution based on hydrochloric acid |
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