CN105056621A - Novel CTA mother liquor recovery utilization system and recovery method - Google Patents
Novel CTA mother liquor recovery utilization system and recovery method Download PDFInfo
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- CN105056621A CN105056621A CN201510475006.9A CN201510475006A CN105056621A CN 105056621 A CN105056621 A CN 105056621A CN 201510475006 A CN201510475006 A CN 201510475006A CN 105056621 A CN105056621 A CN 105056621A
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Abstract
A novel CTA mother liquor recovery utilization system and a recovery method are provided. The system includes a dual-swirl liquid separation device (1) and a candle type filter device (2); a dual-swirl liquid separation device outlet (4) is connected with a candle type filter device inlet (8) through a system pipeline (6); the system pipeline (6) is provided with a valve (7). With use of the dual-swirl liquid separation device, the TA recovery rate is effectively improved, and the recovery rate is increased by 50%-60%; the system has small differential pressure reduction, and the differential pressure is reduced from 400 kPa-500 kPa to 200 kPa-300 kPa; the work cycle is long, the original work cycle is 1 h-2 h, the current work cycle is prolonged to 8 h -9 h, and the cleaning frequency is low.
Description
Technical field
The present invention relates to a kind of new CT A disposing mother liquor and utilize system and recovery method, especially a kind of recycling system and recovery method reclaiming TA from CTA mother liquor.
Background technology
At present, the production of PTA mainly comprises oxidation panel and two stages of refining stage.First stage is oxidation panel, with PX (paraxylene) for raw material, acetic acid is solvent, cobalt manganese acetate is catalyst, and hydrogen bromide is promoter, and air is oxidant, after abundant mixing, high-temperature oxydation generates TA (terephthalic acid (TPA)), and oxidation reactor CTA out (crude terephthalic acid) slurry separates out a large amount of TA particle after crystallizer cooling, is separated by TA particle by Separation of Solid and Liquid operation with CTA mother liquor.Second stage is refining stage, and TA particle enters hydrofinishing section and obtains PTA (p-phthalic acid).
Separation of Solid and Liquid many employings centrifuge or rotary vacuum filter in traditional crude terephthalic acid (CTA) manufacture process, this technology power consumption water consumption is large, and due to rotary vaccum filter nonfunctional Division, filtrated stock, flushing liquor and dehumidification gas are all extracted out by same central tube, form mixed liquor, therefore need to carry out removal of impurities to a part of mixed liquor wherein, too increase the treating capacity of impurity removal process thus, improve processing cost.Simultaneously owing to producing pressure drop when rotary vacuum filter exists owing to filtering, thus cause the problem of product Crystallization Plugging on filter cloth, the frequency of alkali cleaning is very high, not only causes the waste of product and caustic soda, also affects the normal operation of production.
Summary of the invention
The shortcoming and defect part existed in above-mentioned technology, the object of the invention is to design a kind of new CT A disposing mother liquor and utilizes system and recovery method, mainly a kind of recycling system reclaiming TA from CTA mother liquor.
To achieve these goals, the present invention is achieved through the following technical solutions:
A kind of new CT A disposing mother liquor utilizes system, comprises bispin liquid separating apparatus (1) and candle formula filter (2);
Described bispin liquid separating apparatus (1) is provided with the outlet of bispin liquid separating apparatus (4), bispin liquid separating apparatus import (3), bispin liquid separating apparatus slag-drip opening (5) from top to bottom successively;
Described candle formula filter (2) is provided with candle formula filter exhaust outlet (11), liquid level control switch (12), candle formula filter outlet (9), candle formula filter import (8), candle formula filter slag-drip opening (10) from top to bottom successively; Described candle formula filter slag-drip opening (10) connects TA collecting tank by pipeline;
The pipeline that described exhaust outlet (11) connects is provided with valve b; Pressure difference transmitter (13) is connected between described candle formula filter import (8) and candle formula filter outlet (9); Described candle formula filter exhaust outlet (11) pipeline is provided with valve b, on candle formula filter outlet conduit, (9) are provided with valve d, and described candle formula filter outlet (9) connects Clear liquid tank, original fluid container, compressed nitrogen gas tank respectively by pipeline; Described candle formula filter slag-drip opening (10) pipeline is provided with valve c, and described candle formula filter slag-drip opening (10) connects TA collecting tank and sewage draining exit respectively by pipeline;
Described bispin liquid separating apparatus outlet (4) is connected with candle formula filter import (8) by system pipeline (6); Described system pipeline (6) is provided with valve (7).
Further, in technique scheme, described candle formula filter (2) top connects acetic acid/desalination water pot.
Further, in technique scheme, described candle formula filter (2) top connects alkali liquid tank.
Another object of the present invention is to provide a kind of method of CTA disposing mother liquor, comprises the following steps:
CTA mother liquor enters into bispin liquid separating apparatus (1) from bispin liquid separating apparatus import (3), pass through centrifugal action, by Separation of Solid and Liquid, large solid particle TA is discharged to TA collecting tank from bispin liquid separating apparatus slag-drip opening (5), and the liquid containing little solid particle TA is discharged from bispin liquid separating apparatus outlet (4); By system pipeline (6) and valve (7), enter candle formula filter (2), by candle formula filter (2), fine solid particles TA is tackled, limpid CTA mother liquor is discharged to Clear liquid tank from candle formula filter outlet (9), enter PTA refined unit, little solid particle TA is discharged to TA collecting tank from candle formula filter slag-drip opening (10) and reclaims.
Further, in technique scheme, when the pressure between formula filter import (8) and candle formula filter outlet (9) of lighting up reaches 200KPa ~ 300KPa, pressure difference transmitter (13) sends signal, system enters backwash stage, at the end of candle formula filter (2) process, close the valve of the valve d of candle formula filter outlet (9), candle formula filter import (8); First open the valve b of candle formula filter exhaust outlet (11), open the valve c of candle formula filter slag-drip opening (10) again, 13-17 closes second afterwards at once, then the valve d of candle formula filter outlet (9) is opened, after passing into compressed nitrogen, filter cake in filter is split away off under the effect of bubble, the valve d of candle formula filter outlet (9) is closed after 8h ~ 9h, open the valve c of candle formula filter slag-drip opening (10), turbid liquid in candle formula filter is discharged by candle formula filter slag-drip opening (10).So far whole filtering process completes.
Alkali cleaning: system was every one or two month reply filter and carry the pipeline of mother liquor and valve thermokalite bubble to wash once.Alkali cleaning operation all adopts manual operation.
Invention beneficial effect
1, the present invention adopts bispin liquid separating apparatus, effectively improves the TA rate of recovery, and the rate of recovery increases by 50% ~ 60%.
2, present system pressure reduction reduces little, is reduced to 200KPa ~ 300KPa from 400KPa ~ 500KPa.
3, the work period is long, and originally work 1h ~ 2h, now extends to 8h ~ 9h, and cleaning frequency is low.
Accompanying drawing explanation
Accompanying drawing 1 width of the present invention,
Fig. 1 is that CTA disposing mother liquor utilizes system schematic;
In figure: 1, bispin liquid separating apparatus; 2, candle formula filter; 3, bispin liquid separating apparatus import; 4, bispin liquid separating apparatus outlet; 5; Bispin liquid separating apparatus slag-drip opening; 6, system pipeline; 7, valve; 8, candle formula filter import; 9, formula filter of lighting up exports; 10, candle formula filter slag-drip opening; 11, candle formula filter exhaust outlet; 12, liquid level control switch; 13, pressure difference transmitter.
Detailed description of the invention
Following nonlimiting examples can make the present invention of those of ordinary skill in the art's comprehend, but does not limit the present invention in any way.
Embodiment 1
Below in conjunction with accompanying drawing, the invention will be further described.
A kind of new CT A disposing mother liquor utilizes system, comprises bispin liquid separating apparatus 1 and candle formula filter 2;
Bispin liquid separating apparatus 1 is provided with bispin liquid separating apparatus outlet 4, bispin liquid separating apparatus import 3, bispin liquid separating apparatus slag-drip opening 5 from top to bottom successively;
Candle formula filter 2 is provided with candle formula filter exhaust outlet 11, liquid level control switch 12, candle formula filter outlet 9, candle formula filter import 8, candle formula filter slag-drip opening 10 from top to bottom successively; Candle formula filter slag-drip opening 10 connects TA collecting tank by pipeline;
The pipeline that exhaust outlet 11 connects is provided with valve b; Pressure difference transmitter 13 is connected between candle formula filter import 8 and candle formula filter outlet 9; Candle formula filter exhaust outlet 11 pipeline is provided with valve b, and on candle formula filter outlet conduit, 9 are provided with valve d, and candle formula filter outlet 9 connects Clear liquid tank, original fluid container, compressed nitrogen gas tank respectively by pipeline; Candle formula filter slag-drip opening 10 pipeline is provided with valve c, and candle formula filter slag-drip opening 10 connects TA collecting tank and sewage draining exit respectively by pipeline;
Bispin liquid separating apparatus outlet 4 is connected with candle formula filter import 8 by system pipeline 6; System pipeline 6 is provided with valve 7.
Candle formula filter 2 top connects acetic acid/desalination water pot; Candle formula filter 2 top connects alkali liquid tank.
A method for CTA disposing mother liquor, comprises the following steps:
The CTA mother liquor of solid content 2% enters into bispin liquid separating apparatus 1, flow from bispin liquid separating apparatus import 3: 21t/h; Pressure: 0.6MPa; Temperature: 85 DEG C, by centrifugal action, by Separation of Solid and Liquid, large solid particle TA is discharged to TA collecting tank from bispin liquid separating apparatus slag-drip opening 5, and the liquid containing little solid particle TA is discharged from bispin liquid separating apparatus outlet 4; By system pipeline 6 and valve 7, enter candle formula filter 2, by candle formula filter 2, fine solid particles TA is tackled, limpid CTA mother liquor is discharged to Clear liquid tank from candle formula filter outlet 9, now in CAT mother liquor, solid content is 0.016 ~ 0.02%, and little solid particle TA is discharged to TA collecting tank from candle formula filter slag-drip opening 10 and reclaims.
Detailed process is as follows:
1, bispin liquid separation phase: the valve opening bispin liquid separating apparatus import 3 and bispin liquid separating apparatus outlet 4, carries out Separation of Solid and Liquid; After a period of time, open the valve of bispin liquid separating apparatus slag-drip opening 5, carry out deslagging;
2, candle formula filter topping up exhaust phase: while opening the valve of bispin liquid separating apparatus import 3 and bispin liquid separating apparatus outlet 4, open the valve of candle formula filter exhaust outlet 11, the valve of candle formula filtration devices import 8, filtrate entering gas in formula filter 2 of lighting up is discharged.When blast pipe has filtrate to discharge, the liquid level control switch 12 before being arranged at exhaust outlet valve on pipeline section sends signal, and close the valves of candle formula filter exhaust outlet 11, topping up exhaust terminates.
3, light up the formula frit stage: after topping up exhaust process terminates, while closedown exhaust outlet valve, DCS sends switch signal at once, and open the valve of candle formula filter outlet 9, filter enters normal filtration state.Now after filter, clear liquid enters next unit through system clear liquid Trunk Line.When the formula of candle filter import 8 reaches certain pressure reduction with the pressure of candle formula filter outlet 9, pressure difference transmitter 13 sends signal, and system enters backwash stage.
4, candle formula filter backwash stage: when the pressure between the formula of candle filter import 8 and candle formula filter outlet 9 reaches 200KPa ~ 300KPa, pressure difference transmitter 13 sends signal, system enters backwash stage, at the end of candle formula filter 2 process, close the valve of the valve d of candle formula filter outlet 9, candle formula filter import 8; First open the valve b of candle formula filter exhaust outlet 11, open the valve c of candle formula filter slag-drip opening 10 again, 13-17 closes second afterwards at once, then the valve d of candle formula filter outlet 9 is opened, after passing into compressed nitrogen, filter cake in filter is split away off under the effect of bubble, after 8h ~ 9h, close the valve d of candle formula filter outlet 9, open the valve c of candle formula filter slag-drip opening 10, turbid liquid in candle formula filter is discharged by candle formula filter slag-drip opening 10.So far whole filtering process completes.
The above; be only the present invention's preferably detailed description of the invention; but protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; be equal to according to technical scheme of the present invention and inventive concept thereof and replace or change, all should be encompassed within protection scope of the present invention.
Claims (5)
1. new CT A disposing mother liquor utilizes a system, it is characterized in that: comprise bispin liquid separating apparatus (1) and candle formula filter (2);
Described bispin liquid separating apparatus (1) is provided with the outlet of bispin liquid separating apparatus (4), bispin liquid separating apparatus import (3), bispin liquid separating apparatus slag-drip opening (5) from top to bottom successively;
Described candle formula filter (2) is provided with candle formula filter exhaust outlet (11), liquid level control switch (12), candle formula filter outlet (9), candle formula filter import (8), candle formula filter slag-drip opening (10) from top to bottom successively; Described candle formula filter slag-drip opening (10) connects TA collecting tank by pipeline;
Pressure difference transmitter (13) is connected between described candle formula filter import (8) and candle formula filter outlet (9); Described candle formula filter exhaust outlet (11) pipeline is provided with valve b, candle formula filter outlet (9) pipeline is provided with valve d, and described candle formula filter outlet (9) connects Clear liquid tank, original fluid container, compressed nitrogen gas tank respectively by pipeline; Described candle formula filter slag-drip opening (10) pipeline is provided with valve c, and described candle formula filter slag-drip opening (10) connects TA collecting tank and sewage draining exit respectively by pipeline;
Described bispin liquid separating apparatus outlet (4) is connected with candle formula filter import (8) by system pipeline (6); Described system pipeline (6) is provided with valve (7).
2. new CT A disposing mother liquor utilizes system according to claim 1, it is characterized in that: described candle formula filter (2) top connects acetic acid/desalination water pot.
3. new CT A disposing mother liquor utilizes system according to claim 1, it is characterized in that: described candle formula filter (2) top connects alkali liquid tank.
4. a method for CTA disposing mother liquor, is characterized in that comprising the following steps:
CTA mother liquor enters into bispin liquid separating apparatus (1) from bispin liquid separating apparatus import (3), pass through centrifugal action, by Separation of Solid and Liquid, large solid particle TA is discharged to TA collecting tank from bispin liquid separating apparatus slag-drip opening (5), and the liquid containing little solid particle TA is discharged from bispin liquid separating apparatus outlet (4); By system pipeline (6) and valve (7), enter candle formula filter (2), by candle formula filter (2), tackled by fine solid particles TA, limpid CTA mother liquor is discharged to Clear liquid tank from candle formula filter outlet (9); Little solid particle TA is discharged to TA collecting tank from candle formula filter slag-drip opening (10) and reclaims.
5. recovery method according to claim 4, it is characterized in that: when the pressure between formula filter import (8) and candle formula filter outlet (9) of lighting up reaches 200KPa ~ 300KPa, pressure difference transmitter (13) sends signal, system enters backwash stage, at the end of candle formula filter (2) process, close the valve of the valve d of candle formula filter outlet (9), candle formula filter import (8); First open the valve b of candle formula filter exhaust outlet (11), open the valve c of candle formula filter slag-drip opening (10) again, 13-17 closes second afterwards at once, then the valve d of candle formula filter outlet (9) is opened, after passing into compressed nitrogen, filter cake in filter is split away off under the effect of bubble, the valve d of candle formula filter outlet (9) is closed after 8h ~ 9h, open the valve c of candle formula filter slag-drip opening (10), turbid liquid in candle formula filter is discharged by candle formula filter slag-drip opening (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510475006.9A CN105056621A (en) | 2015-08-05 | 2015-08-05 | Novel CTA mother liquor recovery utilization system and recovery method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510475006.9A CN105056621A (en) | 2015-08-05 | 2015-08-05 | Novel CTA mother liquor recovery utilization system and recovery method |
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| CN105056621A true CN105056621A (en) | 2015-11-18 |
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| CN201510475006.9A Pending CN105056621A (en) | 2015-08-05 | 2015-08-05 | Novel CTA mother liquor recovery utilization system and recovery method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105771417A (en) * | 2016-04-25 | 2016-07-20 | 大连凯信石化科技有限公司 | Method for filtering and recovering solid particles in mother solution at PTA oxidation stage and filter using method |
| CN109433703A (en) * | 2018-11-28 | 2019-03-08 | 宜宾海翔化工有限责任公司 | A kind of pressure purge method and system of candle formula demister |
-
2015
- 2015-08-05 CN CN201510475006.9A patent/CN105056621A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105771417A (en) * | 2016-04-25 | 2016-07-20 | 大连凯信石化科技有限公司 | Method for filtering and recovering solid particles in mother solution at PTA oxidation stage and filter using method |
| CN109433703A (en) * | 2018-11-28 | 2019-03-08 | 宜宾海翔化工有限责任公司 | A kind of pressure purge method and system of candle formula demister |
| CN109433703B (en) * | 2018-11-28 | 2024-04-09 | 宜宾海翔化工有限责任公司 | Pressure cleaning method and system for candle type demister |
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