CN103569974A - Refining method of sulfuric acid - Google Patents
Refining method of sulfuric acid Download PDFInfo
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- CN103569974A CN103569974A CN201310531671.6A CN201310531671A CN103569974A CN 103569974 A CN103569974 A CN 103569974A CN 201310531671 A CN201310531671 A CN 201310531671A CN 103569974 A CN103569974 A CN 103569974A
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- sulfuric acid
- gas
- air lift
- tower
- groove
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Abstract
The invention relates to a refining method of sulfuric acid. The refining method comprises the following steps that a. 160-180 DEG C flue gas from a primary absorption tower of a sulfuric acid procedure enters an absorption tower from the bottom, the flue gas is absorbed by 98% sulfuric acid flowing downwards from the tower top in the absorption tower in a countercurrent contact manner, and the 98% sulfuric acid is conveyed into a pump tank after the countercurrent contact absorption operation; b. the 98% sulfuric acid in the pump tank is pumped into a gas stripping tank by a circulating pump, compressed air is filled in the gas stripping tank for gas stripping, sulfur dioxide absorbed by the 98% sulfuric acid volatilizes in the gas stripping tank, the volatile sulfur dioxide gas stripping gas is pumped out and conveyed into a drying tower by a blower at the top of the gas stripping tank, the volatile sulfur dioxide gas stripping gas is repeatedly used in a sulfur burning furnace after being dried, and 98% refined sulfuric acid is collected at the bottom of the gas stripping tank. The refining method provided by the invention has the advantages that the iron content and the sulfur dioxide content of a finished product acid treated by the process are respectively lower than 0.0008%, the quality is stable and the energy consumption is low.
Description
Technical field
The present invention relates to chemical production field, particularly a kind of process for purification of sulfuric acid.
Background technology
POV has two large leading indicators: the one, and iron level requirement≤0.0008%; The 2nd, the free SO dissolving in sulfuric acid
2content requirement≤0.0008%.Existing technology utilization steam goes out the sulfurous gas in sulfuric acid to 98% sulfuric acid heating evaporation, and the method energy consumption is large, unstable product quality.And iron level only has 98% qualified acid of buying and strictly controls in filling, transporting, so quality is very unstable.
Summary of the invention
Object of the present invention is exactly in order to overcome the method for sulfurous gas in heating evaporation removal sulfuric acid of the prior art, and the energy consumption of existence is large, the shortcoming of unstable product quality, the process for purification of a kind of sulfuric acid providing.
The technical solution used in the present invention is as follows:
A process for purification for sulfuric acid, comprises the following steps:
A, from one of sulfuric acid operation, inhale 160 ℃ of-180 ℃ of flue gases of tower, after supercooler, heat exchange, flue-gas temperature is down to 130 ℃-150 ℃;
B, above-mentioned flue gas enter absorption tower from bottom, and 98% sulfuric acid is pumped into absorption tower tower top by POV pump groove, and the 98% sulfuric acid counter current contact of flue gas in absorption tower and from overhead streams absorbs, the flow 48m of 98% sulfuric acid
3∕ h-52m
3∕ h, 98% sulfuric acid after contact absorbs is sent into pump groove, and flue gas returns a suction tower outlet from absorption tower top and enters sulfate system;
C, with recycle pump, 98% sulfuric acid in pump groove is squeezed into air lift groove, under normal temperature, in gas grooves, pass into pressurized air and carry out air lift, air flow quantity 2800m
3∕ h-3000m
3∕ h, the sulfurous gas that 98% sulfuric acid absorbs volatilizees in air lift groove, by the blower fan at air lift groove top, the sulfurous gas air lift gas of volatilization is extracted out and is sent into drying tower, enters sulfur furnace and reuses, air lift trench bottom extraction 98% POV after being dried.
On the basis of technique scheme, can there is following further technical scheme:
From an air lift groove 98% POV part out, be back to pump groove and maintain liquid level, a part is as finished product extraction.
POV system all devices pipeline is all used stainless steel or pp material, stores with 25L plastics barreled, definitely avoids acid partly to contact with carbon steel, guarantees that in product, iron level meets the demands, for a small amount of free SO dissolving in sulfuric acid
2, what the present invention adopted is that vaporizing extract process is removed, SO in product after air lift
2content can reach below 0.0005%.
The invention has the advantages that: the iron level by this technique finished acid and content of sulfur dioxide be all below 0.0008%, and steady quality, energy consumption are low.
Accompanying drawing explanation:
Fig. 1 is process flow sheet of the present invention.
The major equipment adopting in figure
Water cooler: heat interchanging area 50m
2, material 304L
Interchanger: heat interchanging area 50m
2, material 304L
Absorption tower: liner tetrafluoro, Φ 1000 * 8000
Recycle pump groove: 10m
3, material pp
Air lift groove: 4m
3, material pp
Blower fan: 3kw
Recycle pump: alloy material 11kw
Embodiment:
The process for purification of a kind of sulfuric acid provided by the invention, comprises the following steps:
A, 160 ℃ of-180 ℃ of flue gases inhaling tower from one of sulfuric acid operation (include 11 ﹪ SO
3, 7 ﹪ O
2, 1 ﹪ SO
2, all the other are N
2deng), after supercooler, heat exchange, flue-gas temperature is down to 140 ℃;
B, above-mentioned flue gas enter absorption tower from bottom, and 98% sulfuric acid is pumped into absorption tower tower top by POV pump groove, and flue gas 98% sulfuric acid counter current contact in absorption tower and from overhead streams absorbs, the flow 50m of 98% sulfuric acid
3∕ h, 98% sulfuric acid after contact absorbs is sent into pump groove, and flue gas returns a suction tower outlet from absorption tower top and enters sulfate system.Produce in POV process, with the SO3 in 98% sulfuric acid absorption flue gas, 98% sulfuric acid concentration raises, then adds soft water dilute acid dense, by unnecessary sour extraction, is finished product POV.
C, with recycle pump, 98% sulfuric acid in pump groove is squeezed into air lift groove, under normal temperature, in gas grooves, pass into pressurized air and carry out air lift, air flow quantity 3000m
3∕ h, the sulfurous gas that 98% sulfuric acid absorbs volatilizees in air lift groove, by the blower fan at air lift groove top, the sulfurous gas air lift gas of volatilization is extracted out and is sent into drying tower, enters sulfur furnace and reuses, air lift trench bottom extraction 98% POV after being dried.From an air lift groove 98% POV part out, be back to pump groove and maintain liquid level, a part is as finished product extraction.
The concrete quality index of POV of the present invention is as following table:
Claims (2)
1. a process for purification for sulfuric acid, is characterized in that comprising the following steps:
A, from one of sulfuric acid operation, inhale the flue gas of 160 ℃-180 ℃, tower, after supercooler, heat exchange, flue-gas temperature is down to 130 ℃-150 ℃;
B, above-mentioned flue gas enter absorption tower from bottom, and 98% sulfuric acid is pumped into absorption tower tower top by pump groove, and the 98% sulfuric acid counter current contact of flue gas in absorption tower and from overhead streams absorbs, the flow 48m of 98% sulfuric acid
3∕ h-52m
3∕ h, 98% sulfuric acid after contact absorbs is sent into pump groove, and flue gas returns a suction tower outlet from absorption tower top and enters sulfate system;
C, with recycle pump, 98% sulfuric acid in pump groove is squeezed into air lift groove, under normal temperature, in gas grooves, pass into pressurized air and carry out air lift, air flow quantity 2800m
3∕ h-3000m
3∕ h, the sulfurous gas that 98% sulfuric acid absorbs volatilizees in air lift groove, by the blower fan at air lift groove top, the sulfurous gas air lift gas of volatilization is extracted out and is sent into drying tower, enters sulfur furnace and reuses, air lift trench bottom extraction 98% POV after being dried.
2. the process for purification of a kind of sulfuric acid according to claim 1, is characterized in that: from an air lift groove 98% POV part out, be back to pump groove and maintain liquid level, a part is as finished product extraction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310531671.6A CN103569974A (en) | 2013-11-01 | 2013-11-01 | Refining method of sulfuric acid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310531671.6A CN103569974A (en) | 2013-11-01 | 2013-11-01 | Refining method of sulfuric acid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103569974A true CN103569974A (en) | 2014-02-12 |
Family
ID=50042787
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310531671.6A Pending CN103569974A (en) | 2013-11-01 | 2013-11-01 | Refining method of sulfuric acid |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105731394A (en) * | 2015-12-31 | 2016-07-06 | 安阳市岷山有色金属有限责任公司 | Refined sulfuric acid preparation device and preparation method thereof |
| CN106241749A (en) * | 2016-08-30 | 2016-12-21 | 安徽金禾实业股份有限公司 | Blow-off method produces the method for high-purity sulphuric acid |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1689968A (en) * | 2004-04-19 | 2005-11-02 | 上海京藤化工有限公司 | Production method of refined sulfuric acid and production equipment thereof |
| CN102530885A (en) * | 2011-12-14 | 2012-07-04 | 浙江嘉化能源化工股份有限公司 | Industrialized production method for high-purity sulfuric acid |
-
2013
- 2013-11-01 CN CN201310531671.6A patent/CN103569974A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1689968A (en) * | 2004-04-19 | 2005-11-02 | 上海京藤化工有限公司 | Production method of refined sulfuric acid and production equipment thereof |
| CN102530885A (en) * | 2011-12-14 | 2012-07-04 | 浙江嘉化能源化工股份有限公司 | Industrialized production method for high-purity sulfuric acid |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105731394A (en) * | 2015-12-31 | 2016-07-06 | 安阳市岷山有色金属有限责任公司 | Refined sulfuric acid preparation device and preparation method thereof |
| CN106241749A (en) * | 2016-08-30 | 2016-12-21 | 安徽金禾实业股份有限公司 | Blow-off method produces the method for high-purity sulphuric acid |
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Application publication date: 20140212 |