CN102476994B - Method for filtering, washing and separating crude terephthalic acid by using oxidizing unit of fine terephthalic acid device - Google Patents
Method for filtering, washing and separating crude terephthalic acid by using oxidizing unit of fine terephthalic acid device Download PDFInfo
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- CN102476994B CN102476994B CN201010571736.6A CN201010571736A CN102476994B CN 102476994 B CN102476994 B CN 102476994B CN 201010571736 A CN201010571736 A CN 201010571736A CN 102476994 B CN102476994 B CN 102476994B
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Abstract
The invention relates to a method for filtering, washing and separating crude terephthalic acid by using an oxidizing unit of a fine terephthalic acid device. In the method, the aim of removing acetic acid is fulfilled by crudely filtering a crude terephthalic acid suspension and replacing acetic acid in the terephthalic acid by alternatively and repeatedly washing the crude terephthalic acid in sequence with fresh water. In the method, an integrated equipment-press filter is adopted to replace multiple sets of equipment including a vacuum centrifuge, a drier, a washing tower and a powder tank in the conventional process device, so that the equipment quantity is reduced, the flow is shortened, the process operability is enhanced, and a process for separating acetic acid from the crude terephthalic acid can be implemented in one press filter.
Description
Technical field
What the present invention proposed is " filtration, washing, separation " integral method of PTA Equipment oxidation unit crude terephthalic acid, relates to technical field energy-saving and cost-reducing in PTA Equipment oxidation unit.
Background technology
Existing PTA full scale plant oxidation unit, " filtration, washing, separation " process using of crude terephthalic acid traditional " whizzer filter or vacuum filtration-steam rotary dry-gas delivery-tank in making beating " Technology, process flow diagram is shown in Fig. 1.
In PTA full scale plant oxidation unit, in reacted crude terephthalic acid suspension, contain a large amount of acetic acid, crude terephthalic acid is being carried out before hydrofining, need remove the acetic acid in crude terephthalic acid suspension, its processing method is: first with whizzer or vacuum filtration, crude terephthalic acid suspension is carried out to coarse filtration, crude terephthalic acid filter cake after filtration enters steam-tube rotatory dryer, utilize the latent heat indirect heating of saturation steam, make the acetic acid double evaporation-cooling in crude terephthalic acid, utilize the method for dry dehumidification to remove the acetic acid in crude terephthalic acid, what the moisture content of crude terephthalic acid was fallen is very low, then utilize a large amount of process waters to enter the making beating of making beating tank to not containing the crude terephthalic acid of acetic acid, after making beating, enter hydrogenation unit and carry out hydrofining.
This Technology weak point has:
1. technical process is long, and redundant operation is many
" filtration, washing, separation " technique of crude terephthalic acid suspension need to complete respectively in many complete equipments such as " whizzer, drying machine, washing tower, powder material tanks ", and between equipment, need the auxiliary facilitys such as transferpump, blower fan and the pipeline matching, pipe fitting, valve etc., technical process is long, redundant operation is many, easily there is filtrate (acetic acid) leakage, personnel safety is had to harm, equipment, facility floor etc. is had to corrosion.
2. moving equipment is more, and failure rate is high
Vacuum centrifuge for crude terephthalic acid suspension is high rotating speed equipment, and failure rate is high, can not guarantee equipment long-term operation, and easily impact is normal produces; Crude terephthalic acid filter cake viscosity after filtration is high, needs to clean or change the filter core of vacuum centrifuge; In full scale plant, for guaranteeing normal production, vacuum centrifuge adopts one to open a standby mode.
3. equipment volume is large, consumes energy high
Utilize in the crude terephthalic acid filter cake after vacuum centrifuge filters and still contain a large amount of acetic acid, need to utilize the method for drying machine heating evaporation to remove acetic acid, and drying machine employing is vapour pipe revolving drum drier, this drying machine is not only bulky, for a large amount of acetic acid in evaporation crude terephthalic acid filter cake, the quantity of steam needing is also large, consumes energy high.
Summary of the invention
In order to overcome the deficiencies in the prior art, the object of the present invention is to provide the method for a kind of " filtration, washing, separation " of PTA Equipment oxidation unit crude terephthalic acid suspension.
The object of the present invention is achieved like this:
" filtration, washing, separation " integral method of PTA Equipment oxidation unit crude terephthalic acid suspension, its step comprises:
The filtering unit that TA slip in a.TA slurry tank 1 enters filter-press 3 by 2 superchargings of TA shurry pump is indoor, make the suspended substance in TA constantly separated with mother liquor, after separated, TA suspended substance is saved bit by bit in filtering unit chamber, and the mother liquor of separating is by collecting in TA mother liquor holding tank 5;
B. after filtering unit chamber is filled up completely by TA suspended substance, TA suspended substance is transported in once washing element cell, is stored in the washing element cell that the washing water in once washing water pot 6 enter filter-press 3 by 7 superchargings of once washing water pump simultaneously TA suspended substance is washed for the first time; The secondary washing liquid that washing water in once washing water pot 6 are discharged from secondary washing element cell; The sluicing pipe that the once washing liquid that once washing element cell is discharged is connected with control head by washing element cell is expelled in washing water holding tank 4 to be collected;
C. after once washing element cell is filled up completely by TA suspended substance, along with the rotation TA suspended substance of rotary drum is transported in secondary washing element cell, is stored in the washing element cell that the washing water in secondary washing water pot 8 enter filter-press 3 by 9 superchargings of secondary washing water pump simultaneously TA suspended substance is carried out to secondary washing; Washing water in secondary washing water pot 8 are from three washingss of three washing element cell discharges;
D. after secondary washing element cell is filled up completely by TA suspended substance, along with the rotation TA suspended substance of rotary drum is transported in three washing element cells, is stored in three washing water in washing water pot 10 enter filter-press 3 washing element cell by No. three washing water pump 11 superchargings simultaneously TA suspended substance is carried out to three washings; Washing water in three washing water pots 10 are from four washingss of four washing element cell discharges;
E. after three washing element cells are filled up completely by TA suspended substance, along with the rotation TA suspended substance of rotary drum is transported in four washing element cells, is stored in four washing water in washing water pot 12 enter filter-press 3 washing element cell by No. four washing water pump 13 superchargings simultaneously TA suspended substance is carried out to four washings; Washing water in four washing water pots 12 are to be heated to the fresh water of 90 ℃;
F. after four washings finish, along with the rotation TA material of rotary drum is transported to discharge unit chamber, enter the TA filter cake of discharge unit chamber in non-pressure district, from the blowback steam of control head access discharge unit chamber 0.3MPa (G), carry out discharging, the TA filter cake drawing off is delivered to TA making beating tank 14;
G. after discharging finishes, having micro-TA filter cake, to be trapped in active units indoor, before entering next cycle, need by the washing water of 0.3MPa (G), the filter screen of active units chamber to be cleaned, the filter gauze cleaning water of carrying micro-TA filtrate secretly enters in TA slurry tank 1 by collection tube, with next batch TA suspension, enters next cycle after by 2 superchargings of TA shurry pump.
Feature of the present invention:
The present invention adopts integrated equipment---filter-press, substitute the many complete equipments such as " vacuum centrifuge, drying machine, washing tower, powder material tanks " in traditional technology device, and number of devices reduces, and flow process shortens, and the operability of technique improves.The technique of acetic acid in separated crude terephthalic acid is realized in 1 filtering under pressure machine equipment.
In filter-press to after the coarse filtration of crude terephthalic acid suspension, utilize fresh water successively rotation crude terephthalic acid is repeatedly washed to replace the acetic acid in crude terephthalic acid, reach the object of removing acetic acid.The washing water of filter-press successively rotation are used, be that the 4th washing water adopt the fresh process water (last washing process) of 90 ℃, the washing water that adopt for the 3rd time are the process waters after the 4th washing, the washing water that adopt for the 2nd time are the 3rd process waters after washing, the washing water that adopt for the 1st time are the 2nd process waters after washing, the 1st washing water after washing finishes are collected in washing water holding tank, and the rotation successively of washing water is used.The present invention compared with prior art (is shown in Fig. 1), and the moisture content of crude terephthalic acid does not need to reduce, and making beating needs the process water of use to reduce; Without utilizing the latent heat of saturation steam to crude terephthalic acid indirect heating, make the acetic acid double evaporation-cooling in crude terephthalic acid, secondly, making beating needs the process water of use to reduce, and has reduced the consumption of washing water, has reached energy-saving and cost-reducing object.
Accompanying drawing explanation
Fig. 1 is conventional process flow figure.
Fig. 2 is process flow sheet of the present invention.
Fig. 3 is equipment schematic diagram in the present invention.
No. tetra-washing water pump 14-TA making beating tanks of tetra-washing water pot 13-of No. tri-washing water pump 12-of tri-washing water pot 11-of 1-TA slurry tank 2-TA shurry pump 3-filter-press 4-washing water holding tank 5-TA mother liquor holding tank 6-once washing water pot 7-once washing water pump 8-secondary washing water pot 9-secondary washing water pump 10-
embodiment
In the present invention, adopting filter-press 3 is a kind of filtration, washing of Tianhua Chemical Machinery & Automation Design Inst application, the drying integrated continous way filter-press (patent No.: 200920144208.5) this equipment has obtained use in the Technology of terephthalic acid (PTA) device oxidation unit.
Below in conjunction with accompanying drawing 2-3, the flow process of " filter, wash " technique of TA suspension is described in any further:
The method of " filtration, washing, the separation " of PTA Equipment oxidation unit crude terephthalic acid suspension, its step comprises:
TA slip in a.TA slurry tank 1 is pressurized to by TA shurry pump 2 that to enter the filtering unit of filter-press 3 after 0.3MPa (G) indoor, and filter-press 3 is with the centripetal rotation of mode of speed control by frequency variation.The rotary drum of filter-press 3 and the annular zone between shell adopt the packing seal of particular design, and are isolated part and are divided into different air tight housings.In air tight housing, pass into the separating unit compressed gas of 0.5MPa (G), make filter-press 3 in band pressure condition.The surface of rotary drum is comprised of the filtering unit chamber being connected with control head by filtrate pipe, under band pressure condition, make the suspended substance in TA constantly separated with mother liquor, after separated, TA suspended substance is saved bit by bit in filtering unit chamber, and along with the rotation of rotary drum is transported in filter-press 3 washing element cells subsequently; The washing section of filter-press 3 can be divided into a plurality of washings region (as once washing, secondary washing, three washings, four washings).The filtrate pipe that the mother liquor of separating is connected with control head by filtering unit chamber is expelled in TA mother liquor holding tank 5 and collects.
B. after filtration element cell is filled up completely by TA suspended substance, along with the rotation of rotary drum is transported in once washing element cell, is stored in washing water in once washing water pot 6 simultaneously and by once washing water pump 7, is pressurized to the washing element cell that enters filter-press 3 after 0.3MPa (G) TA suspended substance is washed for the first time; The secondary washing liquid that washing water in once washing water pot 6 are discharged from secondary washing element cell; The sluicing pipe that the once washing liquid that once washing element cell is discharged is connected with control head by washing element cell is expelled in washing water holding tank 4 to be collected, and does further processing.
C. after once washing element cell is filled up completely by TA suspended substance, along with the rotation of rotary drum is transported in secondary washing element cell, is stored in washing water in secondary washing water pot 8 simultaneously and by secondary washing water pump 9, is pressurized to the washing element cell that enters filter-press 3 after 0.3MPa (G) TA suspended substance is carried out to secondary washing; Washing water in secondary washing water pot 8 are from three washingss of three washing element cell discharges.
D. after secondary washing element cell is filled up completely by TA suspended substance, along with the rotation of rotary drum is transported in three washing element cells, is stored in three washing water in washing water pot 10 simultaneously and by No. three washing water pumps 11, is pressurized to the washing element cell that enters filter-press 3 after 0.3MPa (G) TA suspended substance is carried out to three washings; Washing water in three washing water pots 10 are from four washingss of four washing element cell discharges.
The process water of filter-press 3 washing sections can adopt the process water after normal temperature process water or heating.
E. after three washing element cells are filled up completely by TA suspended substance, along with the rotation of rotary drum is transported in four washing element cells, is stored in four washing water in washing water pot 12 simultaneously and by No. four washing water pumps 13, is pressurized to the washing element cell that enters filter-press 3 after 0.3MPa (G) TA suspended substance is carried out to four washings; Washing water in four washing water pots 12 are to be heated to the fresh water of 90 ℃.
F. after four washings finish, along with the rotation TA material of rotary drum is transported to discharge unit chamber, enter the TA filter cake of discharge unit chamber in non-pressure district, from the blowback steam of control head access discharge unit chamber 0.3MPa (G), carry out discharging, the TA filter cake drawing off is delivered to TA making beating tank 14.After discharging finishes, having micro-TA filter cake, to be trapped in active units indoor, therefore before entering next cycle, need by the washing water of 0.3MPa (G), the filter screen of active units chamber to be cleaned, the filter gauze cleaning water of carrying micro-TA filtrate secretly enters in TA slurry tank 1 by collection tube, with next batch TA suspension, enters next cycle after by 2 superchargings of TA shurry pump.
Claims (1)
1. the method for " filtration, washing, the separation " of crude terephthalic acid suspension in PTA Equipment oxidation unit, its step comprises:
The filtering unit that TA slip in a.TA slurry tank (1) enters filter-press (3) by TA shurry pump (2) supercharging is indoor, make the suspended substance in TA constantly separated with mother liquor, after separated, TA suspended substance is saved bit by bit in filtering unit chamber, and the mother liquor of separating is by collecting in TA mother liquor holding tank (5);
B. after filtering unit chamber is filled up completely by TA suspended substance, TA suspended substance is transported in once washing element cell, is stored in the washing element cell that the washing water in once washing water pot (6) enter filter-press (3) by once washing water pump (7) supercharging simultaneously TA suspended substance is washed for the first time; The secondary washing liquid that washing water in once washing water pot (6) are discharged from secondary washing element cell; The sluicing pipe that the once washing liquid that once washing element cell is discharged is connected with control head by washing element cell is expelled in washing water holding tank (4) to be collected;
C. after once washing element cell is filled up completely by TA suspended substance, along with the rotation TA suspended substance of rotary drum is transported in secondary washing element cell, is stored in the washing element cell that the washing water in secondary washing water pot (8) enter filter-press (3) by 9 superchargings of secondary washing water pump simultaneously TA suspended substance is carried out to secondary washing; Washing water in secondary washing water pot (8) are from three washingss of three washing element cell discharges;
D. after secondary washing element cell is filled up completely by TA suspended substance, along with the rotation TA suspended substance of rotary drum is transported in three washing element cells, is stored in washing water in three washing water pots (10) enter filter-press (3) washing element cell by No. three washing water pumps (11) supercharging simultaneously and TA suspended substance is carried out to three times washs; Washing water in three washing water pots (10) are from four washingss of four washing element cell discharges;
E. after three washing element cells are filled up completely by TA suspended substance, along with the rotation TA suspended substance of rotary drum is transported in four washing element cells, is stored in washing water in four washing water pots (12) enter filter-press (3) washing element cell by No. four washing water pumps (13) supercharging simultaneously and TA suspended substance is carried out to four times washs; Washing water in four washing water pots (12) are to be heated to the fresh water of 90 ℃;
F. after four washings finish, along with the rotation TA material of rotary drum is transported to discharge unit chamber, enter the TA filter cake of discharge unit chamber in non-pressure district, from the blowback vapor pressure of control head access discharge unit chamber 0.3MPa, carry out discharging, the TA filter cake drawing off is delivered to TA making beating tank (14);
G. after discharging finishes, having micro-TA filter cake, to be trapped in active units indoor, washing water by 0.3MPa before entering next cycle clean the filter screen of active units chamber, the filter gauze cleaning water of carrying micro-TA filtrate secretly enters in TA slurry tank (1) by collection tube, with next batch TA suspension, enters next cycle after by TA shurry pump (2) supercharging.
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| CN201010571736.6A CN102476994B (en) | 2010-11-30 | 2010-11-30 | Method for filtering, washing and separating crude terephthalic acid by using oxidizing unit of fine terephthalic acid device |
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| CN104016847A (en) * | 2013-03-01 | 2014-09-03 | 中石化上海工程有限公司 | Method for removing acetic acid from terephthalic acid filter cake |
| CN103497777A (en) * | 2013-10-14 | 2014-01-08 | 天华化工机械及自动化研究设计院有限公司 | Heavy oil and bitumen extraction and separation method from coal-based oil residue |
| CN104826384B (en) * | 2014-04-24 | 2017-07-28 | 因温斯特技术公司 | Filter for aromatic carboxylic acid |
| CN103936581A (en) * | 2014-04-24 | 2014-07-23 | 天华化工机械及自动化研究设计院有限公司 | Method for improving CTA (Cellulose Triacetate) solvent exchange efficiency |
| CN105085231A (en) * | 2014-05-20 | 2015-11-25 | 天华化工机械及自动化研究设计院有限公司 | Treatment method of acetic acid solvent in oxidation unit of PTA industrial equipment |
| CN105237391B (en) * | 2015-10-23 | 2018-01-12 | 天华化工机械及自动化研究设计院有限公司 | A kind of method for further improving CTA exchange of solvent efficiency |
| CN108623449A (en) * | 2017-03-22 | 2018-10-09 | 天华化工机械及自动化研究设计院有限公司 | The method of " two-stage three-step approach " CTA exchange of solvent |
| CN108627438B (en) * | 2017-03-23 | 2020-11-17 | 天华化工机械及自动化研究设计院有限公司 | Rotary pressure filter test device, test method and filter design method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201534023U (en) * | 2009-10-17 | 2010-07-28 | 兰州瑞德干燥技术有限公司 | Filtering, washing and drying integrated continuous pressure filter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201534023U (en) * | 2009-10-17 | 2010-07-28 | 兰州瑞德干燥技术有限公司 | Filtering, washing and drying integrated continuous pressure filter |
Non-Patent Citations (2)
| Title |
|---|
| 压滤机在PTA行业中的应用分析;蒋国光等;《聚酯工业》;20060930;第19卷(第5期);32-34 * |
| 蒋国光等.压滤机在PTA行业中的应用分析.《聚酯工业》.2006,第19卷(第5期),32-34. |
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Address after: 730060 Gansu city of Lanzhou province Xigu District Heshui Road No. 3 Applicant after: Tianhua Institute of Chemical Machinery & Automation Co., Ltd. Applicant after: National Drying Technology and Equipment Engineering Technology Research Center Applicant after: Ruide Drying Technology Co., Ltd., Lanzhou Address before: 730050 Gansu city of Lanzhou province Xigu District Heshui Road No. 3 Applicant before: Tianhua Chemical Machinery & Automation Research Inst. Applicant before: National Drying Technology and Equipment Engineering Technology Research Center Applicant before: Ruide Drying Technology Co., Ltd., Lanzhou |
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