CN103950902B - A kind of sulfuric acid process alkylation acid-restoring plant dilute acid pretreatment system - Google Patents
A kind of sulfuric acid process alkylation acid-restoring plant dilute acid pretreatment system Download PDFInfo
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- CN103950902B CN103950902B CN201410200204.XA CN201410200204A CN103950902B CN 103950902 B CN103950902 B CN 103950902B CN 201410200204 A CN201410200204 A CN 201410200204A CN 103950902 B CN103950902 B CN 103950902B
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Abstract
A kind of sulfuric acid process alkylation acid-restoring plant dilute acid pretreatment system, belongs to petroleum refining technology field, comprises packing tower, it is characterized in that, on packing tower thin acid pump inlet suction tube line, arrange switchable two groups of gauze strainers in parallel; On packing tower outlet line Shang Fen bis-tunnel, one tunnel returns to packing tower top as washing diluted acid after the cooling of diluted acid plate-type heat exchanger, another road, under the control of dilute acid streams gauge and variable valve, is introduced drying tower circulation groove, respectively and is inhaled tower circulation groove, two and inhale tower circulation grooves.The present invention had both saved softening water consumption, reduced dilute acid pretreatment operation again, alleviated the pressure of sewage disposal, and the peculiar smell produced when eliminating diluted acid discharge, saves unslaked lime consumption simultaneously, reduces equipment power consumption, reduces labor capacity.
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 China is to the increase of high-grade gasoline demand, the alkyl plant producing high-grade gasoline also increases thereupon, country enhances the environmental requirement of producing Petrochemical Enterprises simultaneously, China's many refinery alkylation devices are forced to stop production because the spent acid produced in production process cannot process, and the alkyl plant on new also faces same environmental issue.The spent acid that alkylation produces can be converted into the vitriol oil recycle that concentration is 98% by alkylation acid-restoring plant.Acid-restoring plant purification section furnace gas adopts dynamic wave scrubber-stuffing washing tower-electrostatic precipitator-electrostatic precipitator acid-scrubbing cleaning flow process.Packing tower thin acid pump is entered by the washing diluted acid flowed out bottom packing tower, through packing tower thin acid pump outlet point two-way, a part returns to packing tower top as washing composition after the cooling of diluted acid plate-type heat exchanger, part washing diluted acid returns dynamic wave scrubber to the process of sewage workshop section, and this part washing dilute acid concentration is 7-10%, need use neutralization with lime, dilute acid pretreatment amount is large, unslaked lime consumption is large, and be interrupted the electric energy of consumption two stirrers and outer conveying pump, comprehensive cost is high simultaneously.The peculiar smell that the diluted acid of acid-restoring plant discharge simultaneously produces is large, and easily to environment, add sewage device treatment capacity after dilute acid pretreatment, sewage quantity is unstable, impacts large to waste disposal plant.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, adds 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 dilute acid pretreatment operation again, alleviate the pressure of sewage disposal, the peculiar smell produced when eliminating diluted acid discharge, saves unslaked lime consumption simultaneously, minimizing equipment power consumption, reduces labor capacity.
The technology of the present invention specifically adopts following technical scheme:
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 inlet suction tube line, arrange switchable two groups of gauze strainers in parallel; On packing tower outlet line Shang Fen bis-tunnel, one tunnel returns to packing tower top as washing diluted acid after the cooling of diluted acid plate-type heat exchanger, another road is under the control of dilute acid streams gauge and variable valve, introduce drying tower circulation groove, respectively 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 is 7-10%, is conducive to the yield improving finished product sulfuric acid.
Compared with prior art, beneficial effect of the present invention is: the flow 1) regulating diluted acid by variable valve, controlling drying tower circulation groove sulfuric acid concentration is 93%, one inhales tower circulation groove, two suction tower circulation groove sulfuric acid concentrations are 98%, both save softening water consumption, save again the expense of sewage disposal.2) pressure of sewage disposal is alleviated, the peculiar smell produced when eliminating diluted acid discharge.3) save unslaked lime consumption, reduce equipment power consumption, reduce labor capacity.
Accompanying drawing explanation
Fig. 1 is present device schematic flow sheet;
In figure, 1-packing tower thin acid pump, 2-diluted acid strainer, 3-diluted acid plate-type heat exchanger, 4-packing tower, 5-dilute acid streams gauge and variable valve, 6-drying tower circulation groove, 7-mono-inhales tower circulation groove, and 8-bis-inhales tower circulation groove, and 9-softens waterline.
Embodiment
The present invention is further illustrated below by drawings and Examples.
This example selects Shandong Jincheng Petrochemical Group Co., Ltd. 12Kt/ alkylation acid-restoring plant to be example, further illustrates the present invention.
As shown in Figure 1, on packing tower thin acid pump 1 inlet suction tube line, set up switchable two networking shape diluted acid strainers 2 in parallel, avoid owing to washing the impurity such as arsenic, fluorine blocking thin acid pump source line and valve in packing tower furnace gas; Point two-way on outlet line, one tunnel returns to packing tower 4 top as washing diluted acid after diluted acid plate-type heat exchanger 3 is lowered the temperature, one tunnel is under the control of dilute acid streams gauge and variable valve 5, introduce drying tower circulation groove 6, respectively and inhale tower circulation groove 7, two suction tower circulation groove 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, save 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/sky; In technical scheme of the present invention, spent acid at the bottom of packing tower does not spend dynamic wave scrubber and arrives the process of sewage workshop section again, saves unslaked lime consumption and power consumption; After substituting softening water complex acid with 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 water, reduce the running cost of device.
Claims (1)
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 inlet suction tube line, arranges switchable two groups of gauze strainers in parallel; On packing tower outlet line Shang Fen bis-tunnel, one tunnel returns to packing tower top as washing diluted acid after the cooling of diluted acid plate-type heat exchanger, another road is under the control of dilute acid streams gauge and variable valve, introduce drying tower circulation groove, respectively and inhale tower circulation groove, two suction tower circulation grooves, replace softening water allotment finished product sulfuric acid.
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 CN103950902A (en) | 2014-07-30 |
| CN103950902B true CN103950902B (en) | 2016-01-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| 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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| Country | Link |
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| CN (1) | CN103950902B (en) |
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 |
|---|
| 烷基化废硫酸高温裂解生产硫酸工艺运行总结;李存福等;《聚乙烯醇》;20130731;第41卷(第7期);第44-46页 * |
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| CN103950902A (en) | 2014-07-30 |
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Granted publication date: 20160113 Termination date: 20210513 |