CN101850232B - First tower for removing orthodichlorobenzene - Google Patents
First tower for removing orthodichlorobenzene Download PDFInfo
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- CN101850232B CN101850232B CN 201010209789 CN201010209789A CN101850232B CN 101850232 B CN101850232 B CN 101850232B CN 201010209789 CN201010209789 CN 201010209789 CN 201010209789 A CN201010209789 A CN 201010209789A CN 101850232 B CN101850232 B CN 101850232B
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- vacuum unit
- knockout drum
- air inlet
- valve
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Abstract
The invention discloses a first tower for removing orthodichlorobenzene, comprising a tail gas condenser, a front separation tank, a vacuum unit, a rear separation tank and a gaseous phase tube. Gas exhausted from the condenser enters the vacuum unit through the front separation tank and then enters the gaseous phase tube through the rear separation tank. The front and the rear separation tanks are provided with liquid discharge devices, hand holes and bypass pipelines. The invention has the advantages of solving the problems of blockage and frequent cleanness of the vacuum unit, reducing the labor intensity of workers, reducing the overhaul expense and ensuring that a TDI (toluene diisocyanate) device can stably run for a long term.
Description
Technical field
The present invention relates to chemical field, relates to specifically a kind of first ortho-dichlorobenzene tower.
Background technology
Toluene di-isocyanate(TDI) (being called for short TDI) is the important source material of polyurethane industrial, and the first removing orthodichlorobenzene in TDI produces (being called for short ODCB) tower is one of nucleus equipment of producing in the TDI device.During TDI produces, whether the first pressure stability of taking off the ODCB tower directly affects the normal operation of TDI device; The influence of fluctuations of tower top pressure the balance of tower, finally had influence on the quality of TDI product.
Existing first takes off ODCB tower intermediate pump directly enters the vacuum unit from the gas of tower top tail gas condenser suction, and separator exhaust out directly enters the gas phase house steward.Because the impurity that the gas of tower top extraction is carried secretly is more, cause cooler, the working solution pipeloop of this vacuum unit and import and export the gas phase pipeline and stop up serious, the fluctuation of tower top pressure is larger, affected the first normal operating of taking off the ODCB tower, on average minimum the needs clears up once weekly, and cleaning work has strengthened workman's labour intensity and increased recondition expense frequently.
Summary of the invention
The object of the invention is to overcome the defective of above-mentioned prior art, provide a kind of first to take off the ODCB tower, solved the impurity that gas that tower top extracts out carries secretly more, cause cooler, the working solution pipeloop of vacuum unit and import and export the gas phase pipeline and stop up seriously, the problem that the tower top pressure fluctuation is larger.
In order to achieve the above object, the invention provides a kind of first ortho-dichlorobenzene tower, comprise tail gas condenser, vacuum unit, gas phase pipe, connect tail gas condenser be connected with the vacuum unit vacuum unit air inlet pipeline, connect the vacuum unit gas exhaust piping of the gentle pipe mutually of vacuum unit, knockout drum before arranging between tail gas condenser and vacuum unit air inlet pipeline, enter front knockout drum from the gas of tail gas condenser suction by front knockout drum air inlet pipeline, then enter the vacuum unit by vacuum unit air inlet pipeline.
Be provided with front knockout drum air intake valve on front knockout drum air inlet pipeline, be provided with vacuum unit air inlet pipeline valve on vacuum unit air inlet pipeline.
Between tail gas condenser and vacuum unit air inlet pipeline, an air inlet bypass conduit is set, be provided with air inlet bypass conduit valve on the air inlet bypass conduit, current knockout drum air intake valve and vacuum unit air inlet pipeline valve closing, during air inlet bypass conduit valve open, enter vacuum unit air inlet pipeline from the gas of tail gas condenser suction by the air inlet bypass conduit, then enter the vacuum unit.
Be provided with front knockout drum hand hole and front knockout drum tapping valve on front knockout drum.
Between vacuum unit gas exhaust piping and gas phase pipe, rear knockout drum is set, the gas of discharging from vacuum unit gas exhaust piping enters rear knockout drum, then enters the gas phase pipe by rear knockout drum gas exhaust piping.
Be provided with vacuum unit gas exhaust piping valve on vacuum unit gas exhaust piping, be provided with rear knockout drum gas exhaust piping valve on rear knockout drum gas exhaust piping.
A discharge bypass pipeline is set between vacuum unit gas exhaust piping and gas phase pipe, be provided with the discharge bypass pipe valve on the discharge bypass pipeline, when vacuum unit gas exhaust piping valve and after knockout drum gas exhaust piping valve closing, when the discharge bypass pipe valve is opened, the gas of discharging from the vacuum unit enters the discharge bypass pipeline by vacuum unit gas exhaust piping, then enters the gas phase pipe.
Be provided with rear knockout drum hand hole and rear knockout drum tapping valve on rear knockout drum.
Add a front knockout drum enter the entrance of vacuum unit from the tower top tail gas condenser before, front knockout drum is provided with pumping equipment, hand hole and by-pass line.Knockout drum after in like manner out adding again one from the vacuum unit also is provided with pumping equipment, hand hole and by-pass line on rear knockout drum.Pumping equipment often carries out discharge opeing and guarantees that first takes off the normal operation of ODCB tower vacuum system, when the system that affects normally moves, system is cut to by-pass line, and the hand hole from knockout drum is cleared up knockout drum, and after cleaning, switchback guarantees that first takes off ODCB tower vacuum system and normally move.
The invention solves the problem that the vacuum unit stops up and frequently clears up; Reduced workman's labour intensity, reduced recondition expense, and guaranteed that the TDI device can smooth long term running.
Description of drawings
Fig. 1 is the structural representation of first ortho-dichlorobenzene tower vacuum system of the present invention.
Mark in figure: 1, tail gas condenser; 2, front knockout drum air inlet pipeline valve; 3, front knockout drum air inlet pipeline; 4, air inlet bypass conduit valve; 5, air inlet bypass conduit; 6, vacuum unit air inlet pipeline valve; 7, vacuum unit air inlet pipeline; 8, vacuum unit gas exhaust piping; 9, vacuum unit gas exhaust piping valve; 10, exhaust bypass line; 11, exhaust bypass line valve; 12, gas phase pipe; 13, rear knockout drum gas exhaust piping valve; 14, rear knockout drum gas exhaust piping; 15, rear knockout drum; 16, rear knockout drum hand hole; 17, rear knockout drum tapping valve; 18, vacuum unit; 19, front knockout drum tapping valve; 20, front knockout drum; 21, front knockout drum hand hole.
The specific embodiment
as shown in Figure 1, first ortho-dichlorobenzene tower, comprise tail gas condenser 1, front knockout drum 20, vacuum unit 18, rear knockout drum 15, gas phase pipe 12, the front knockout drum air inlet pipeline 3 that connects tail gas condenser 1 and front knockout drum 20, the vacuum unit air inlet pipeline 7 of knockout drum 20 and vacuum unit 18 before connecting, the vacuum unit gas exhaust piping 8 that connects vacuum unit 18 and rear knockout drum 15, the rear knockout drum gas exhaust piping 14 of knockout drum 15 and gas phase pipe 12 after connecting, be provided with by-pass valve control on each pipeline, enter front knockout drum 20 from the gas of tail gas condenser 1 suction by front knockout drum air inlet pipeline 3, then enter vacuum unit 18 by vacuum unit air inlet pipeline 7, the gas of discharging from vacuum unit 18 enters rear knockout drum 15 by vacuum unit gas exhaust piping 8, enter gas phase pipe 12 by rear knockout drum gas exhaust piping 14 at last.
Between tail gas condenser 1 and vacuum unit air inlet pipeline 7, an air inlet bypass conduit 5 is set, be provided with air inlet bypass conduit valve 4 on air inlet bypass conduit 5, current knockout drum air intake valve 2 and vacuum unit air inlet pipeline valve 6 are closed, when air inlet bypass conduit valve 4 is opened, enter described vacuum unit air inlet pipeline 7 from the gas of described tail gas condenser 1 suction by described air inlet bypass conduit 5, then enter vacuum unit 18.
A discharge bypass pipeline 10 is set between vacuum unit gas exhaust piping 8 and gas phase pipe 12, be provided with discharge bypass pipe valve 11 on discharge bypass pipeline 10, when vacuum unit gas exhaust piping valve 9 and after knockout drum gas exhaust piping valve 13 close, when discharge bypass pipe valve 11 is opened, the gas of discharging from vacuum unit 18 enters discharge bypass pipeline 10 by vacuum unit gas exhaust piping 8, then enters gas phase pipe 12.
Vavuum pump from first take off 1 suction of ODCB tower tail gas condenser gas be introduced into the front knockout drum 20 (when normally moving, tail gas condenser 1 goes the air inlet bypass conduit valve 4 on the air inlet bypass conduit 5 of vacuum unit 18 to cut out) of vacuum unit 18 entrances, in the past knockout drum 20 gas out enters vacuum unit 18, and vacuum unit 18 gas out enters rear knockout drum 15 again and then enters gas phase pipe 12 (when normally moving vacuum unit 18 degas the discharge bypass pipe valve 11 of managing mutually on 12 discharge bypass pipeline 10 close).
Be equipped with pumping equipment, hand hole and by-pass line on forward and backward knockout drum.Can regularly clear up forward and backward knockout drum.When the front knockout drum 20 of cleaning, close front knockout drum air intake valve 2 and vacuum unit air inlet pipeline valve 6, front knockout drum 20 is cut out system, open air inlet bypass conduit valve 4 and guarantee that first takes off the normal operation of ODCB tower, switchback system again after cleaning out.In like manner can clear up rear knockout drum 15.
Claims (7)
1. first ortho-dichlorobenzene tower, comprise tail gas condenser (1), vacuum unit (18), gas phase pipe (12), the vacuum unit air inlet pipeline (7) that connects described tail gas condenser (1) and described vacuum unit (18), the vacuum unit gas exhaust piping (8) that connects described vacuum unit (18) and described gas phase pipe (12), it is characterized in that, between described tail gas condenser (1) and vacuum unit air inlet pipeline (7), front knockout drum (20) is set, enter described front knockout drum (20) from the gas of described tail gas condenser (1) suction by front knockout drum air inlet pipeline (3), then enter vacuum unit (18) by described vacuum unit air inlet pipeline (7), between described tail gas condenser (1) and vacuum unit air inlet pipeline (7), an air inlet bypass conduit (5) is set, be provided with air inlet bypass conduit valve (4) on described air inlet bypass conduit (5), when described front knockout drum air intake valve (2) and described vacuum unit air inlet pipeline valve (6) are closed, described air inlet bypass conduit valve (4) is when opening, enter described vacuum unit air inlet pipeline (7) from the gas of described tail gas condenser (1) suction by described air inlet bypass conduit (5), then enter vacuum unit (18), between described vacuum unit gas exhaust piping (8) and gas phase pipe (12), a discharge bypass pipeline (10) is set, be provided with discharge bypass pipe valve (11) on described discharge bypass pipeline (10), when described vacuum unit gas exhaust piping valve (9) and described after knockout drum gas exhaust piping valve (13) close, described discharge bypass pipe valve (11) is when opening, the gas of discharging from described vacuum unit (18) enters described discharge bypass pipeline (10) by described vacuum unit gas exhaust piping (8), then enters gas phase pipe (12).
2. first ortho-dichlorobenzene tower as claimed in claim 1, it is characterized in that, be provided with front knockout drum air intake valve (2) on described front knockout drum air inlet pipeline (3), be provided with vacuum unit air inlet pipeline valve (6) on described vacuum unit air inlet pipeline (7).
3. first ortho-dichlorobenzene tower as claimed in claim 2, is characterized in that, is provided with front knockout drum hand hole (21) and front knockout drum tapping valve (19) on described front knockout drum (20).
4. described first ortho-dichlorobenzene tower as arbitrary in claim 1-3, it is characterized in that, between described vacuum unit gas exhaust piping (8) and described gas phase pipe (12), rear knockout drum (15) is set, the gas of discharging from described vacuum unit gas exhaust piping (8) enters described rear knockout drum (15), then enters described gas phase pipe (12) by rear knockout drum gas exhaust piping (14).
5. first ortho-dichlorobenzene tower as claimed in claim 3, it is characterized in that, be provided with vacuum unit gas exhaust piping valve (9) on described vacuum unit gas exhaust piping (8), be provided with rear knockout drum gas exhaust piping valve (13) on described rear knockout drum gas exhaust piping (14).
6. first ortho-dichlorobenzene tower as claimed in claim 5, is characterized in that, is provided with rear knockout drum hand hole (16) and rear knockout drum tapping valve (17) on described rear knockout drum (15).
7. first ortho-dichlorobenzene tower as claimed in claim 5, is characterized in that, is provided with rear knockout drum hand hole (16) and rear knockout drum tapping valve (17) on described rear knockout drum (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010209789 CN101850232B (en) | 2010-06-25 | 2010-06-25 | First tower for removing orthodichlorobenzene |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010209789 CN101850232B (en) | 2010-06-25 | 2010-06-25 | First tower for removing orthodichlorobenzene |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101850232A CN101850232A (en) | 2010-10-06 |
| CN101850232B true CN101850232B (en) | 2013-06-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010209789 Expired - Fee Related CN101850232B (en) | 2010-06-25 | 2010-06-25 | First tower for removing orthodichlorobenzene |
Country Status (1)
| Country | Link |
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| CN (1) | CN101850232B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113694851B (en) * | 2021-09-03 | 2023-02-10 | 江西宝弘纳米科技有限公司 | Method and equipment for preventing explosion and boiling in aluminum isopropoxide synthesis |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101698652A (en) * | 2009-11-05 | 2010-04-28 | 甘肃银达化工有限公司 | Method for purifying cyclic solvent in producing TDI |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9523215D0 (en) * | 1995-11-13 | 1996-01-17 | Petro Man Ltd | Filling of tanks with volatile liquids |
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2010
- 2010-06-25 CN CN 201010209789 patent/CN101850232B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101698652A (en) * | 2009-11-05 | 2010-04-28 | 甘肃银达化工有限公司 | Method for purifying cyclic solvent in producing TDI |
Non-Patent Citations (2)
| Title |
|---|
| 何杰等.新型塔内件在TDI第一脱ODCB塔扩产改造中的应用.《聚氨酯工业》.2009,第24卷(第2期),第35-38页. |
| 新型塔内件在TDI第一脱ODCB塔扩产改造中的应用;何杰等;《聚氨酯工业》;20091231;第24卷(第2期);第35-38页 * |
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| CN101850232A (en) | 2010-10-06 |
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