CN101139102A - Method for preparing sodium carbonate liquor through stack gas carbonation - Google Patents
Method for preparing sodium carbonate liquor through stack gas carbonation Download PDFInfo
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- CN101139102A CN101139102A CNA2006101532294A CN200610153229A CN101139102A CN 101139102 A CN101139102 A CN 101139102A CN A2006101532294 A CNA2006101532294 A CN A2006101532294A CN 200610153229 A CN200610153229 A CN 200610153229A CN 101139102 A CN101139102 A CN 101139102A
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Abstract
The present invention is a method to prepare sodium carbonate solution by flue gas recycling. Firstly the sodium hydroxide solution needed is prepared in a recycling groove and the sodium hydroxide solution prepared is infiltrated into a gas-liquid injector by recycling pump to react with the carbon dioxide in the flue gas generated by passing through a cooler. The sodium hydroxide solution prepared and the carbon dioxide react with a temperature between 50 to 90 degrees and carry through recycling reaction. When the reaction is terminated, the free alkali concentration in the recycling groove is more than 0 percent. The present invention has solved the greenhouse effect to atmosphere caused by carbon dioxide; simultaneously the present invention creates the sodium carbonate solution by carbon dioxide. The present invention has the advantages of low cost and energy consumption, etc. The present invention can be broadly applied to the sodium carbonate solution preparation by carbonatation of the flue gas generated by burning of coal and natural gas and is specifically suitable for being applied to chlor-alkali enterprises.
Description
Technical field
The present invention relates to produce behind coal, the combustion of natural gas recovery and utilization technology field of stack gas, especially a kind of method with preparing sodium carbonate liquor through stack gas carbonation.
Background technology
The compositions such as oxynitride, carbonic acid gas and carbon monoxide that produce in the stack gas behind coal, the combustion of natural gas all are toxic and harmfuls, environment is polluted, particularly carbonic acid gas has caused environment specialist's attention to atmospheric Greenhouse effect in the stack gas.
After the entry to WTO, along with the quickening of national macroeconomic development, the soda ash downstream industry has kept higher consumption rate of growth in recent years, and price has also gone up about 30%.
How to reduce carbonic acid gas in the stack gas to atmospheric Greenhouse effect, can utilize it again simultaneously, become the problem that everybody pays close attention to always." feasibility analysis of stack gas carbonating system yellow soda ash " that Beijing University of Chemical Technology's Lie group is given birth to provides a kind of solution, this processing method flow process is from stack gas, oxynitride wherein to be removed, carbonic acid gas is absorbed preparation yellow soda ash in carbonating tower with sodium hydroxide.Idiographic flow is: the stack gas that is rich in carbonic acid gas can directly feed in the carbonating tower.The compressed machine compression of stack gas is squeezed into from the bottom of carbonating tower, and alkali lye is beaten from the top of carbonating tower.In carbonating tower, carbonic acid gas in the stack gas and alkali lye generation acidification reaction generate sodium carbonate solution.The mixture of alkali lye and yellow soda ash is squeezed in the next carbonating tower together, continues reaction.The sodium carbonate solution that generates generates the mixture of crystals of sodium carbonate and alkali lye by three crystallize sodium carbonate devices, after filtering through filter, remaining alkali lye add again utilized and crystallizer in mixture generation heat exchange after, squeeze into carbonating tower again and continue reaction.Crystals of sodium carbonate is dry in pre-dryers, is sent to the alkali storehouse by suspension bucket, again through after the bleacher bleaching, and crystallization in the mono-hydrate crystallizer.After filtering, in calcining furnace, calcine, generate anhydrous sodium carbonate.But there is following defective in it: the first, its reactor has been selected carbonating tower, carbonating tower manufacturing cost height (stainless steel); In heat release or thermo-negative reaction, easily produce thermograde and concentration gradient, react inhomogeneous, generation be sodium bicarbonate and sodium carbonate mixture.The second, carbonating tower need be done propulsion source with carbon dioxide compressor, the energy consumption height.Three, it can not produce the sodium carbonate solution of different concns.Four, long flow path, reference mark are many, the energy consumption height.
Summary of the invention
The object of the present invention is to provide the method for the low and preparing sodium carbonate liquor through stack gas carbonation that energy consumption is low of a kind of cost.
The method of preparing sodium carbonate liquor through stack gas carbonation, in circulation groove, prepare the sodium hydroxide solution that needs earlier, with recycle pump with the sodium hydroxide solution of preparation through interchanger squeeze in the gas-liquid ejector with the stack gas of coming through supercooler in carbonic acid gas react, the sodium hydroxide solution of preparation and the temperature of carbon dioxide reaction are between 50-90 ℃, and carry out circulating reaction, during reaction terminating, free alkali concn is greater than 0% in the circulation groove.
Above-mentioned preparing sodium carbonate liquor through stack gas carbonation method, its preparation concentration of sodium hydroxide solution is 7-50%, and gas concentration lwevel is 8-45%, and temperature of reaction is 65-85 ℃.
Above-mentioned preparing sodium carbonate liquor through stack gas carbonation method, its preparation concentration of sodium hydroxide solution 10-30%.
Above-mentioned preparing sodium carbonate liquor through stack gas carbonation method is utilized salkali waste or low-concentration sodium hydroxide solution and solid caustic soda evaporation condensed water preparation sodium hydroxide solution, is fit to chlor-alkali enterprise and uses.
Above-mentioned preparing sodium carbonate liquor through stack gas carbonation method, the stack gas after coal or the sulfur-containing gas burning will be handled through refining plant before cooling, was fit to the many enterprises of stack gas impurity and used.
Above-mentioned preparing sodium carbonate liquor through stack gas carbonation method, its gas-liquid ejector can be several.
Replace carbonating tower because of the present invention adopts gas-liquid ejector, on the one hand, reaction evenly can obtain sodium carbonate solution, and reduce cost, on the other hand, has saved carbon dioxide compressor, has reduced energy consumption.If chlor-alkali plant adopts the present invention, can directly utilize the three wastes of chlor-alkali plant to produce the outsourcing finishing agent that oneself needs, satisfy and use by oneself, produce the enterprise of 200,000 tons in caustic soda per year, plant investment can be saved (the blowdown environmental protection that does not comprise saving is charged) about 1,300,000 yuan less than 200,000 yuan.The stack gas carbonating that the present invention can be widely used in producing behind coal, the combustion of natural gas is produced sodium carbonate solution, is particularly suitable for chlor-alkali enterprise and uses.
Description of drawings
The present invention will be further described by implementing below in conjunction with accompanying drawing.
Fig. 1 utilizes the process flow sheet of industrialized unit of the method for preparing sodium carbonate liquor through stack gas carbonation at chlor-alkali industry for the present invention.
Embodiment
With reference to Fig. 1, embodiment 1 technical process: the sodium hydroxide solution of pipeline 1 is prepared 10% sodium hydroxide solution in circulation groove 4, starts the carbonic acid gas that recycle pump 5 squeezes into the sodium hydroxide solutions of preparation in three gas-liquid ejectors 8 with concentration 9% in the stack gas of supercooler 3 through interchanger 6 (controlling sodium hydroxide solution heating or cooling according to technological temperature) and carries out carbonation reaction; Adjust interchanger 6 and water cooler 3 valve openings, keep 75 ℃ of temperature of reaction, flue gas cools is to normal temperature, circulation absorbs, when free alkali less than 1%, termination reaction, by pipeline 9, the yellow soda ash header tank of getting to the primary brine operation is stand-by the sodium carbonate solution of producing; Above-mentioned sodium hydroxide solution can be prepared with the solid caustic soda evaporation condensed water with salkali waste or low-concentration sodium hydroxide solution (solid caustic soda washing equipment water).
Embodiment 3 difference from Example 1 are temperature of reaction at 60 ℃, the naoh concentration 30% of preparation, gas concentration lwevel 22%.
Embodiment 4 difference from Example 1 are temperature of reaction at 50 ℃, the naoh concentration 48% of preparation, and gas concentration lwevel 45%, gas-liquid ejector are five.
Embodiment 5 difference from Example 1 are temperature of reaction at 85 ℃, the naoh concentration 15% of preparation.
It is fixed that the quantity of the gas-liquid ejector in the foregoing description is come according to output.
Claims (6)
1. the method for a preparing sodium carbonate liquor through stack gas carbonation, it is characterized in that: the sodium hydroxide solution of in circulation groove, preparing needs earlier, with recycle pump with the sodium hydroxide solution of preparation through interchanger squeeze in the gas-liquid ejector with the stack gas of coming through supercooler in carbonic acid gas react, the sodium hydroxide solution of preparation and the temperature of carbon dioxide reaction are between 50-90 ℃, and carry out circulating reaction, during reaction terminating, free alkali concn is greater than 0% in the circulation groove.
2. preparing sodium carbonate liquor through stack gas carbonation method according to claim 1 is characterized in that: the preparation concentration of sodium hydroxide solution is 7-50%, and gas concentration lwevel is 8-45%, and temperature of reaction is 65-85 ℃.
3. preparing sodium carbonate liquor through stack gas carbonation method according to claim 1 and 2 is characterized in that: preparation concentration of sodium hydroxide solution 10-30%.
4. preparing sodium carbonate liquor through stack gas carbonation method according to claim 3 is characterized in that: utilize salkali waste or low-concentration sodium hydroxide solution and solid caustic soda evaporation condensed water preparation sodium hydroxide solution.
5. preparing sodium carbonate liquor through stack gas carbonation method according to claim 4 is characterized in that: the stack gas after coal or the sulfur-containing gas burning will be handled through refining plant before cooling.
6. preparing sodium carbonate liquor through stack gas carbonation method according to claim 5 is characterized in that: gas-liquid ejector can be several.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006101532294A CN101139102A (en) | 2006-09-05 | 2006-09-05 | Method for preparing sodium carbonate liquor through stack gas carbonation |
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| CNA2006101532294A CN101139102A (en) | 2006-09-05 | 2006-09-05 | Method for preparing sodium carbonate liquor through stack gas carbonation |
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| CN101139102A true CN101139102A (en) | 2008-03-12 |
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| CNA2006101532294A Pending CN101139102A (en) | 2006-09-05 | 2006-09-05 | Method for preparing sodium carbonate liquor through stack gas carbonation |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103523836A (en) * | 2013-10-12 | 2014-01-22 | 宁夏宝塔石化科技实业发展有限公司 | Method for treating waste lye containing sulfur |
| CN103588226A (en) * | 2013-11-19 | 2014-02-19 | 中国成达工程有限公司 | Method for preparing sodium carbonate by supplementing CO2 to flue gas |
| CN106187679A (en) * | 2016-06-29 | 2016-12-07 | 山东聊城中盛蓝瑞化工有限公司 | The recycling system and method for carbon dioxide in a kind of chlorinated hydrocabon hydrolysis tail gas |
| CN107164629A (en) * | 2017-04-25 | 2017-09-15 | 昆明理工大学 | A kind of aluminium scrap base hydrogenation catalyst processing method based on microwave oxygen-enriched air roasting |
| CN109154448A (en) * | 2016-03-22 | 2019-01-04 | 生命生态世界股份有限公司 | The mechanical system of capture and conversion polluted gas, and the method for purification air |
| CN114849610A (en) * | 2022-04-12 | 2022-08-05 | 新疆圣雄氯碱有限公司 | Method and device for preparing sodium carbonate from waste sulfuric acid regeneration waste gas to realize carbon emission reduction |
| CN115557619A (en) * | 2021-07-02 | 2023-01-03 | 宝山钢铁股份有限公司 | Cold rolling alkaline reverse osmosis concentrated water zero discharge method and process system |
-
2006
- 2006-09-05 CN CNA2006101532294A patent/CN101139102A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103523836A (en) * | 2013-10-12 | 2014-01-22 | 宁夏宝塔石化科技实业发展有限公司 | Method for treating waste lye containing sulfur |
| CN103523836B (en) * | 2013-10-12 | 2015-09-02 | 宁夏宝塔石化科技实业发展有限公司 | A kind of sulfur-containing wasting alkali liquid processing method |
| CN103588226A (en) * | 2013-11-19 | 2014-02-19 | 中国成达工程有限公司 | Method for preparing sodium carbonate by supplementing CO2 to flue gas |
| CN103588226B (en) * | 2013-11-19 | 2015-12-02 | 中国成达工程有限公司 | A kind ofly supplement with stack gas the method that CO2 prepares soda ash |
| CN109154448A (en) * | 2016-03-22 | 2019-01-04 | 生命生态世界股份有限公司 | The mechanical system of capture and conversion polluted gas, and the method for purification air |
| CN106187679A (en) * | 2016-06-29 | 2016-12-07 | 山东聊城中盛蓝瑞化工有限公司 | The recycling system and method for carbon dioxide in a kind of chlorinated hydrocabon hydrolysis tail gas |
| CN107164629A (en) * | 2017-04-25 | 2017-09-15 | 昆明理工大学 | A kind of aluminium scrap base hydrogenation catalyst processing method based on microwave oxygen-enriched air roasting |
| CN115557619A (en) * | 2021-07-02 | 2023-01-03 | 宝山钢铁股份有限公司 | Cold rolling alkaline reverse osmosis concentrated water zero discharge method and process system |
| CN114849610A (en) * | 2022-04-12 | 2022-08-05 | 新疆圣雄氯碱有限公司 | Method and device for preparing sodium carbonate from waste sulfuric acid regeneration waste gas to realize carbon emission reduction |
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Open date: 20080312 |