CN105293534A - Method for producing sodium sulfite solution by using sulfur dioxide gas - Google Patents
Method for producing sodium sulfite solution by using sulfur dioxide gas Download PDFInfo
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- CN105293534A CN105293534A CN201510875445.9A CN201510875445A CN105293534A CN 105293534 A CN105293534 A CN 105293534A CN 201510875445 A CN201510875445 A CN 201510875445A CN 105293534 A CN105293534 A CN 105293534A
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- sodium sulfite
- sulfur dioxide
- sulfite solution
- dioxide gas
- gas
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Abstract
The invention belongs to the field of sodium sulfite solutions, in particular relates to a method for producing a sodium sulfite solution by using a sulfur dioxide gas, and aims to solve the technical problems that a conventional process is relatively complex, large in energy consumption and relatively high in cost and the environment can be polluted. The scheme for solving the technical problems is to provide a method for producing a sodium sulfite solution by using a sulfur dioxide gas. The method comprises the following step: enabling a sodium hydroxide solution as an absorbing liquid to react with sulfur dioxide, thereby obtaining the sodium sulfite solution. The method provided by the invention is simple in process procedure, free of carbon dioxide gas, free of waste discharge, and low in cost.
Description
Technical field
The invention belongs to sodium sulfite solution production field, be specifically related to utilize sulfur dioxide gas to produce the method for sodium sulfite solution.
Background technology
The comparatively ripe traditional technology of sodium sulfite produciton route is Method of Soda, take sulphur as raw material, sulfur dioxide gas is obtained after burning, sulfurous gas is obtained by reacting sodium sulfite solution with sodium carbonate solution again, neutralize with caustic soda again and obtain sodium sulfite solution, obtain finished product finally by concentrated, centrifugal, drying.Method of Soda production technique is comparatively complicated, and energy consumption is large, and cost is higher, releases a large amount of carbon dioxides in process of production, contaminate environment simultaneously.
In electrolysis with ion-exchange film production process, the sodium sulfite solution of 10% need be used as reductive agent, eliminate the free chlorine of light salt brine.Comparatively traditional way is direct outsourcing solid sodium sulfite, and use after transporting, load and unload, be mixed with the solution of 10%, pilot process is more, adds buying and cost of labor simultaneously.If can utilize raw material advantage, having sulphuric acid production enterprises as neighbouring, adding the caustic soda soln that our factory is self-produced, designing the mode of production that a kind of technique is simple, with low cost, will be a large amount of purchase cost of chlor-alkali enterprises saving.
Summary of the invention
The technical problem to be solved in the present invention is that existing technique is comparatively complicated, and energy consumption is large, and cost is higher, contaminate environment.
Invent the scheme solved the problems of the technologies described above and be to provide a kind of method utilizing sulfur dioxide gas to produce sodium sulfite solution, comprise the following steps: be that absorption liquid and sulfurous gas react with sodium hydroxide solution, obtain sodium sulfite solution.
The above-mentioned sulfur dioxide gas that utilizes is produced in the method for sodium sulfite solution, and the concentration of described sodium hydroxide solution is 10%wt ~ 13%wt.
As preferred embodiments of the present invention, described sodium hydroxide solution be by ion-exchange membrane electrolyzer go out groove alkali lye and de-salted water formulated.Described go out the concentration of groove alkali lye be 30%wt ~ 32%wt.Described desalination electrical conductivity of water≤10us/cm.
The above-mentioned sulfur dioxide gas that utilizes is produced in the method for sodium sulfite solution, and described sulfurous gas is from the gas containing sulfurous gas after sulphuric acid process cleaning section.
The above-mentioned sulfur dioxide gas that utilizes is produced in the method for sodium sulfite solution, and the temperature of described reaction is 30 DEG C ~ 50 DEG C.
The above-mentioned sulfur dioxide gas that utilizes is produced in the method for sodium sulfite solution, reacts terminate when the pH value of absorption liquid reduces to 8 ~ 9.
The main chemical reactions equation that the present invention relates to is as follows: 2NaOH+SO
2→ Na
2sO
3+ H
2o;
Side reaction has: Na
2sO
3+ 1/2O
2→ Na
2sO
4.
Beneficial effect of the present invention is: 1. have good environmental benefit: contrast traditional sodium sulfite produciton technique, and technical solution of the present invention operational path is simple, does not produce carbon dioxide, three-waste free discharge; 2. there is good economic benefit: contrast traditional sodium sulfite produciton technique, technical solution of the present invention is with low cost, S-WAT per ton (98%) production cost is only 1/2 of traditional technology, calculate with the device producing 300000 tons of NaOH per year, every year can about saving of purchase cost 80W unit.
Accompanying drawing explanation
Fig. 1 process flow sheet of the present invention.
Embodiment
Utilize sulfur dioxide gas to produce the method for sodium sulfite solution, comprise the following steps: be that absorption liquid and sulfurous gas react with sodium hydroxide solution, obtain sodium sulfite solution.
The above-mentioned sulfur dioxide gas that utilizes is produced in the method for sodium sulfite solution, and the concentration of described sodium hydroxide solution is 10%wt ~ 13%wt.If naoh concentration is lower than 10%, the concentration of sodium sulfite produced is low, does not reach electrolysis with ion-exchange film dechlorination necessary requirement; If naoh concentration is greater than 13%, the concentration of sodium sulfite produced is higher, causes separating out partial crystals in solution, and influential system operates.
As preferred embodiments of the present invention, described sodium hydroxide solution be by ion-exchange membrane electrolyzer go out groove alkali lye and de-salted water formulated.Described go out the concentration of groove alkali lye be 30%wt ~ 32%wt.Described desalination electrical conductivity of water≤10us/cm.
The above-mentioned sulfur dioxide gas that utilizes is produced in the method for sodium sulfite solution, and described sulfurous gas is from the gas containing sulfurous gas after sulphuric acid process cleaning section.
The above-mentioned sulfur dioxide gas that utilizes is produced in the method for sodium sulfite solution, and the temperature of described reaction is 30 DEG C ~ 50 DEG C.
The above-mentioned sulfur dioxide gas that utilizes is produced in the method for sodium sulfite solution, reacts terminate when the pH value of absorption liquid reduces to 8 ~ 9.
Embodiment 1
Sulfur dioxide gas from vitriol works enters absorption tower through absorption tower bottom air inlet, contact (because adopting cyclic absorption technique with the absorption liquid solution certainly flow down by tail gas tower is reverse, when absorption liquid concentration is prepared by herein 10% ~ 13% progressively reduces, finally be about 2 ~ 3g/L to free sodium hydroxide concentration at the end of reaction end), carry out absorption reaction.From top, absorption tower unreacted out completely gas enter again bottom tail gas tower, react with sodium hydroxide solution, remove sulfur dioxide gas further, the tail gas reaching emission standard drains into air.When absorption liquid pH value is down to 8 ~ 9, stops absorbing, obtain sodium sulfite solution.
Embodiment 2
According to the technical process described in embodiment 1, control absorption liquid pH value and stop absorbing 5 ~ 6 time, in reaction process, generate NaHSO
3, hydro-oxidation sodium solution adjusted to ph 8 ~ 9, generates S-WAT.
The sodium sulfite solution prepared of embodiment 1 and embodiment 2, its data are as following table 1:
Table 1 sodium sulfite solution testing data table
| Sequence number | Embodiment | Absorption liquid concentration | Reaction end pH value | Na 2SO 3Concentration | Remarks |
| 1 | Embodiment 1 | 10.06％ | 8.64 | 12.89％ | |
| 2 | Embodiment 1 | 11.86％ | 8.32 | 16.93％ | |
| 3 | Embodiment 1 | 12.13％ | 8.26 | 17.22％ | |
| 4 | Embodiment 2 | 10.54％ | 5.38/8.54 | 18.89％ | |
| 5 | Embodiment 2 | 11.37％ | 5.62/8.79 | 21.26％ | A small amount of crystal is had to separate out |
| 6 | Embodiment 2 | 12.21％ | 5.59/8.17 | 23.49％ | A small amount of crystal is had to separate out |
Note: because sequence number 4,5,6 have employed double absorption method, says that the sodium sulfite solution concentration of producing is higher, has occurred a small amount of S-WAT crystal structure, therefore in actual production, adopt embodiment 1 to produce as far as possible.
In electrolysis with ion-exchange film production process, the sodium sulfite solution of 10% need be used as reductive agent, eliminate the free chlorine of light salt brine.From table 1, the sodium sulfite solution adopting the inventive method to prepare, can reach the requirement needed for the free chlorine eliminating light salt brine in electrolysis with ion-exchange film production process.
Method operational path provided by the invention is simple, does not produce carbon dioxide, three-waste free discharge, and with low cost.
Claims (7)
1. utilize sulfur dioxide gas to produce the method for sodium sulfite solution, comprise the following steps: be that absorption liquid and sulfurous gas react with sodium hydroxide solution, obtain sodium sulfite solution.
2. the method utilizing sulfur dioxide gas to produce sodium sulfite solution according to claim 1, is characterized in that: the concentration of described sodium hydroxide solution is 10%wt ~ 13%wt.
3. the sulfur dioxide gas that utilizes according to claim 1 produces the method for sodium sulfite solution, it is characterized in that: described sodium hydroxide solution be by ion-exchange membrane electrolyzer go out groove alkali lye and de-salted water formulated.
4. the sulfur dioxide gas that utilizes according to claim 3 produces the method for sodium sulfite solution, it is characterized in that: described in go out groove alkali lye concentration be 30%wt ~ 32%wt.
5. the method utilizing sulfur dioxide gas to produce sodium sulfite solution according to claim 1, is characterized in that: described sulfurous gas is from the gas containing sulfurous gas after sulphuric acid process cleaning section.
6. the method utilizing sulfur dioxide gas to produce sodium sulfite solution according to claim 1, is characterized in that: the temperature of described reaction is 30 DEG C ~ 50 DEG C.
7. the method utilizing sulfur dioxide gas to produce sodium sulfite solution according to claim 1, is characterized in that: react when the pH value of absorption liquid reduces to 8 ~ 9 and terminate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510875445.9A CN105293534A (en) | 2015-12-03 | 2015-12-03 | Method for producing sodium sulfite solution by using sulfur dioxide gas |
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|---|---|---|---|
| CN201510875445.9A CN105293534A (en) | 2015-12-03 | 2015-12-03 | Method for producing sodium sulfite solution by using sulfur dioxide gas |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108557845A (en) * | 2018-03-09 | 2018-09-21 | 杨奕颉 | A kind of production method of sodium sulfite |
-
2015
- 2015-12-03 CN CN201510875445.9A patent/CN105293534A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108557845A (en) * | 2018-03-09 | 2018-09-21 | 杨奕颉 | A kind of production method of sodium sulfite |
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Application publication date: 20160203 |