CN103950902A - Diluted acid treatment system of sulfuric acid alkylation waste acid recovery device - Google Patents
Diluted acid treatment system of sulfuric acid alkylation waste acid recovery device Download PDFInfo
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- CN103950902A CN103950902A CN201410200204.XA CN201410200204A CN103950902A CN 103950902 A CN103950902 A CN 103950902A CN 201410200204 A CN201410200204 A CN 201410200204A CN 103950902 A CN103950902 A CN 103950902A
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Abstract
The invention relates to a diluted acid treatment system of a sulfuric acid alkylation waste acid recovery device, belonging to the technical field of petroleum refining. The diluted acid treatment system comprises a packed column and is characterized in that two sets of switchable gauze filters are arranged in parallel on the suction inlet pipeline of the diluted acid pump inlet of the packed column; the diluted acid in the outlet pipeline of the packed column is divided into two parts, wherein one part of the diluted acid is cooled by a diluted acid plate heat exchanger and returns back to the top of the packed column and used as washing diluted acid, and the other part of the diluted acid is introduced respectively into a dry tower circulation tank, a first absorption tower circulation tank and a second absorption tower circulation tank under the control of a diluted acid flow meter and a control valve. According to the invention, the amount of softened water is saved, diluted acid treatment processes are reduced, the stress of wastewater treatment is relieved, odors generated in the discharge of the diluted acid are eliminated, the usage of quicklime is saved, and the power consumption of equipment and the amount of labor are reduced.
Description
Technical field
The invention belongs to petroleum refining technology field, be specifically related to a kind of sulfuric acid process alkylation acid-restoring plant dilute acid pretreatment system.
Background technology
In recent years, along with the increase of China to high-grade gasoline demand, the alkyl plant of producing high-grade gasoline also increases thereupon, country has strengthened the environmental requirement that Petrochemical Enterprises is produced simultaneously, make many refinery alkylation devices of China cannot process and be forced to stop production because of the spent acid producing in production process, the alkyl plant on new also faces same environmental issue.It is 98% vitriol oil recycle that the spent acid that alkylation acid-restoring plant can produce alkylation be converted into concentration.Acid-restoring plant purification section furnace gas adopts dynamic wave scrubber-stuffing washing tower-electrostatic precipitator-electrostatic precipitator acid-scrubbing cleaning flow process.The washing diluted acid being flowed out by packing tower bottom enters packing tower thin acid pump, through packing tower thin acid pump outlet point two-way, a part is returned to packing tower top as washing composition after diluted acid sheet heat exchanger is cooling, a part of washing diluted acid returns to dynamic wave scrubber and processes to sewage workshop section, this part wash dilute acid concentration be 7 ?10%, need neutralization with lime, dilute acid pretreatment amount is large, unslaked lime consumption is large, is interrupted the electric energy that consumes two stirrers and outer conveying pump simultaneously, and comprehensive cost is high.The peculiar smell that the diluted acid of acid-restoring plant discharge simultaneously produces is large, easily to environment, has increased sewage device treatment capacity after dilute acid pretreatment, and sewage quantity is unstable, waste disposal plant is impacted large.At acid-restoring plant dry absorption section, in order to ensure concentration and the turbidity of sulfuric acid, generally select softening water complex acid, concentration is wayward, has increased the running cost of device.
Summary of the invention
Patent of the present invention is for the deficiency in alkylation acid-restoring plant technique, a kind of sulfuric acid process alkylation acid-restoring plant dilute acid pretreatment technique and system are provided, it had both saved softening water consumption, reduce again dilute acid pretreatment operation, alleviate the pressure of sewage disposal, the peculiar smell producing while eliminating diluted acid discharge is saved unslaked lime consumption simultaneously, minimizing equipment power consumption, reduces labor capacity.
The following technical scheme of the concrete employing of the technology of the present invention:
A kind of sulfuric acid process alkylation acid-restoring plant dilute acid pretreatment system, comprises packing tower, it is characterized in that, on packing tower thin acid pump entrance suction line, switchable two groups of gauze strainers in parallel is set; On packing tower outlet line Shang Fen bis-tunnels, packing tower top is returned to as washing diluted acid in one tunnel after the cooling of diluted acid sheet heat exchanger, another road is under the control of diluted acid under meter and variable valve, introduce respectively drying tower circulation groove, and inhale tower circulation groove, two suction tower circulation grooves, replace softening water allotment finished product sulfuric acid, ensure concentration and the turbidity of finished product sulfuric acid.
Wherein, useless dilute acid concentration be 7 ?10%, be conducive to improve the yield of finished product sulfuric acid.
Compared with prior art, beneficial effect of the present invention is: the flow that 1) can regulate by variable valve diluted acid, controlling drying tower circulation groove sulfuric acid concentration is 93%, it is 98% that one suction tower circulation groove, two is inhaled tower circulation groove sulfuric acid concentrations, both save softening water consumption, saved again the expense of sewage disposal.2) pressure of alleviation sewage disposal, the peculiar smell producing while eliminating diluted acid discharge.3) save unslaked lime consumption, reduce equipment power consumption, reduce labor capacity.
Brief description of the drawings
Fig. 1 is present device schematic flow sheet;
In figure, 1 ?packing tower thin acid pump, 2 ?diluted acid strainers, 3 ?diluted acid sheet heat exchangers, 4 ?packing towers, 5 ?diluted acid under meter and variable valve, 6 ?drying tower circulation grooves, 7 ?mono-inhale tower circulation groove, and 8 ?bis-inhale tower circulation groove, and 9 ?soften waterline.
Embodiment
Further illustrate the present invention below by drawings and Examples.
It is example that this example is selected the 12Kt/ of Shandong Jincheng Petrochemical Group Co., Ltd. alkylation acid-restoring plant, further illustrates the present invention.
As shown in Figure 1, on packing tower thin acid pump 1 entrance suction line, set up switchable two networking shape diluted acid strainers 2 in parallel, avoid stopping up thin acid pump source line and valve owing to washing the impurity such as arsenic, fluorine in packing tower furnace gas; Point two-way on outlet line, packing tower 4 tops are returned to as washing diluted acid in one tunnel after 3 coolings of diluted acid sheet heat exchanger, one tunnel is under the control of diluted acid under meter and variable valve 5, introduce respectively drying tower circulation groove 6, a suction tower circulation groove 7, two suction tower circulation grooves 8, replace softening water 9 to allocate finished product sulfuric acid, ensure concentration and the turbidity of finished product sulfuric acid.Like this, both save softening water consumption, saved again the expense of sewage disposal.
In prior art, softening water consumption is 4.2 tons/day, and unslaked lime consumption is 0.2 ton/day, and power consumption is 50 degree/skies; In technical scheme of the present invention, at the bottom of packing tower, spent acid does not spend dynamic wave scrubber and arrives the processing of sewage workshop section again, saves unslaked lime consumption and power consumption; With after the alternative softening water complex acid of diluted acid at the bottom of packing tower, dilute acid concentration is 8%, drying tower circulation groove, one is inhaled tower circulation groove, two and is inhaled tower circulation groove diluted acid consumptions and be respectively 2.52 tons/day, 1.26 tons/day, 0.42 ton/day, drying tower circulation groove, one is inhaled sulfuric acid concentration in tower circulation groove, two suction tower circulation grooves and is respectively 93%, 98%, 98%, save a large amount of softening waters, reduced the running cost of device.
Claims (2)
1. a sulfuric acid process alkylation acid-restoring plant dilute acid pretreatment system, comprises packing tower, it is characterized in that, on packing tower thin acid pump entrance suction line, switchable two groups of gauze strainers in parallel is set; On packing tower outlet line Shang Fen bis-tunnels, packing tower top is returned to as washing diluted acid in one tunnel after the cooling of diluted acid sheet heat exchanger, another road is under the control of diluted acid under meter and variable valve, introduce respectively drying tower circulation groove, and inhale tower circulation groove, two suction tower circulation grooves, replace softening water allotment finished product sulfuric acid.
2. sulfuric acid process alkylation acid-restoring plant dilute acid pretreatment system according to claim 1, is characterized in that, described useless dilute acid concentration be 7 ?10%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410200204.XA CN103950902B (en) | 2014-05-13 | 2014-05-13 | A kind of sulfuric acid process alkylation acid-restoring plant dilute acid pretreatment system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410200204.XA CN103950902B (en) | 2014-05-13 | 2014-05-13 | A kind of sulfuric acid process alkylation acid-restoring plant dilute acid pretreatment system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103950902A true CN103950902A (en) | 2014-07-30 |
| CN103950902B CN103950902B (en) | 2016-01-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410200204.XA Expired - Fee Related CN103950902B (en) | 2014-05-13 | 2014-05-13 | A kind of sulfuric acid process alkylation acid-restoring plant dilute acid pretreatment system |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5324499A (en) * | 1990-11-30 | 1994-06-28 | Chemetics International Co. Ltd. | Fluoride removal from sulphuric acid |
| CN1751984A (en) * | 2004-09-20 | 2006-03-29 | 中国石油天然气股份有限公司 | Process for producing sulfuric acid by high-temperature cracking of alkylation waste sulfuric acid |
| CN201140025Y (en) * | 2007-12-07 | 2008-10-29 | 灵宝市开源矿业有限责任公司 | Flue gas purification and recovery system |
| CN103552992A (en) * | 2013-10-30 | 2014-02-05 | 中石化南京工程有限公司 | System and method for preparing acid by using sulfur-containing wastewater through dry method |
-
2014
- 2014-05-13 CN CN201410200204.XA patent/CN103950902B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5324499A (en) * | 1990-11-30 | 1994-06-28 | Chemetics International Co. Ltd. | Fluoride removal from sulphuric acid |
| CN1751984A (en) * | 2004-09-20 | 2006-03-29 | 中国石油天然气股份有限公司 | Process for producing sulfuric acid by high-temperature cracking of alkylation waste sulfuric acid |
| CN201140025Y (en) * | 2007-12-07 | 2008-10-29 | 灵宝市开源矿业有限责任公司 | Flue gas purification and recovery system |
| CN103552992A (en) * | 2013-10-30 | 2014-02-05 | 中石化南京工程有限公司 | System and method for preparing acid by using sulfur-containing wastewater through dry method |
Non-Patent Citations (1)
| Title |
|---|
| 李存福等: "烷基化废硫酸高温裂解生产硫酸工艺运行总结", 《聚乙烯醇》 * |
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| CN103950902B (en) | 2016-01-13 |
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Granted publication date: 20160113 Termination date: 20210513 |