CN204417391U - A kind of for the BDO vacuum system in PBT production - Google Patents
A kind of for the BDO vacuum system in PBT production Download PDFInfo
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- CN204417391U CN204417391U CN201520050685.0U CN201520050685U CN204417391U CN 204417391 U CN204417391 U CN 204417391U CN 201520050685 U CN201520050685 U CN 201520050685U CN 204417391 U CN204417391 U CN 204417391U
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Abstract
The utility model belongs to PBT production technical field, particularly relate to a kind of for the BDO vacuum system in PBT production, comprise the scraper condenser being communicated with vacuum pump and polycondensation reaction device respectively, scraper condenser high inside has installed BDO spray equipment, liquid BDO outlet bottom scraper condenser is communicated with surge tank successively by BDO circulation line, BDO recycle pump, interchanger and BDO spray equipment, interchanger is communicated with refrigeration cycle water pipeline, feed-water end near refrigeration cycle water pipeline upper circulation water pump is communicated with major cycle water water inlet pipe, refrigeration cycle water pipeline is upper is communicated with major cycle water rising pipe in major cycle water water inlet pipe top position.The utility model regulates the temperature of the cooling circulating water flowing through interchanger by introducing the lower major cycle water of temperature, thus reaches liquid BDO temperature in accurate control BDO circulation line the object of 45 DEG C ± 0.5 DEG C, system run all right.
Description
Technical field
The utility model belongs to PBT production technical field, particularly relates to a kind of for the BDO vacuum system in PBT production.
Background technology
Polybutylene terephthalate, English name polybutylene terephthalate, be called for short PBT, belong to polyester series, by terephthalic acid (Terephthalic acid, and 1.4-butyleneglycol (1.4-butanediol PTA), BDO) esterification is carried out, then carry out precondensation and final minification to gather, by control pressure (negative pressure), temperature and the residence time to proper level, the polycondensation polymerization degree can be set, make the final expected value reaching needs as the viscosity measuring the polymerization degree, the PBT of final obtained desired viscosity.
Condition of negative pressure in existing PBT production process is realized by vacuum pump vacuum system, and the stability of vacuum system is not high, does not reach suitable vacuum tightness, and affect the viscosity of the finished product PBT, and energy consumption is high, cost is high.
Utility model content
Technical problem to be solved in the utility model is: the deficiency existed for prior art, there is provided a kind of for the BDO vacuum system in PBT production, cool after being met by BDO steam and liquid BDO, BDO vapour volume sharply shrinks formation condition of negative pressure, the stability of vacuum system is high, reach desirable vacuum tightness, save energy, reduce costs.
For solving the problems of the technologies described above, the technical solution of the utility model is:
A kind of for the BDO vacuum system in PBT production, comprise the scraper condenser being communicated with vacuum pump and polycondensation reaction device respectively, described scraper condenser is communicated with polycondensation reaction device by BDO vapour line, described scraper condenser high inside has installed BDO spray equipment, be provided with liquid BDO bottom described scraper condenser to export, described liquid BDO outlet is communicated with surge tank successively by BDO circulation line, BDO recycle pump, interchanger and BDO spray equipment, the entrance of cooling water of described interchanger is communicated with by refrigeration cycle water pipeline with cooling water outlet, described refrigeration cycle water pipeline is provided with water circulating pump, refrigeration cycle water pipeline near the feed-water end of described water circulating pump is communicated with major cycle water water inlet pipe, described refrigeration cycle water pipeline is upper is communicated with major cycle water rising pipe in major cycle water water inlet pipe top position.
Improve as one, described major cycle water water inlet pipe is provided with diaphragm type pneumatic variable valve.
Improve as one, the difference of altitude between described major cycle water water inlet pipe and major cycle water rising pipe is 1 meter.
Improve as one, the refrigeration cycle water pipeline near the feed-water end of described water circulating pump is provided with thermometer.
As improving further, described scraper condenser comprises horizontal cylinder and vertical cylinder, rotating shaft is provided with in described horizontal cylinder, described rotating shaft is provided with the scraper plate matched with horizontal cylinder inwall, the tail end outside being positioned at described horizontal cylinder is provided with the motor be connected with described rotating shaft transmission, the tail end top of described horizontal cylinder connects vertical cylinder, the top of described vertical cylinder connects vacuum pump, the head end top of described horizontal cylinder is communicated with BDO vapour line, be provided with liquid BDO bottom the tail end of described horizontal cylinder to export, BDO spray equipment is provided with in described vertical cylinder, described BDO spray equipment comprises the spiral nozzle of more than one back taper.
As improving further, described BDO spray equipment comprises the spiral nozzle of plural back taper, and described spiral nozzle is positioned at the different heights position of vertical cylinder.
Owing to have employed technique scheme, the beneficial effects of the utility model are:
Because scraper condenser is communicated with polycondensation reaction device by BDO vapour line, and be communicated with vacuum pump, scraper condenser high inside has installed BDO spray equipment, when the liquid BDO that BDO steam and BDO spray equipment spray meets, BDO vapour volume is sharply shunk, make to form condition of negative pressure in scraper condenser, rerun vacuum pump to reach suitable vacuum tightness when vacuum tightness does not reach and requires, realize compared with condition of negative pressure with utilizing merely vacuum pump, save energy, reduce costs, liquid BDO in BDO circulation line carries out heat exchange by the recirculated water in interchanger and cooling water circulation pipeline, further, recirculated water in cooling water circulation pipeline is communicated with major cycle water, the circulating water temperature in cooling water circulation pipeline can be regulated so further, regulate the temperature of the liquid BDO in BDO circulation line better, ensure that liquid BDO is in a stable temperature range, the stable vacuum tightness that formation process needs.
Because major cycle water water inlet pipe is provided with diaphragm type pneumatic variable valve, major cycle water in energy flexible major cycle water water inlet pipe enters the flow in refrigeration cycle water pipeline, the circulating water temperature in refrigeration cycle water pipeline is effectively regulated by the adjustment major cycle water flow entered in refrigeration cycle water pipeline, ensure that the recirculated water in refrigeration cycle water pipeline is in suitable temp, flexible adjustment is convenient, the stability of enhanced system work.
Because the difference of altitude between major cycle water water inlet pipe and major cycle water rising pipe is 1 meter, ensure that the major cycle water in major cycle water water inlet pipe enters in refrigeration cycle water pipeline, avoid major cycle water directly flow out from major cycle water rising pipe and do not flow through interchanger.
Because the refrigeration cycle water pipeline of feed-water end near water circulating pump is provided with thermometer, can circulating water temperature in real-time monitored refrigeration cycle water pipeline, be convenient to regulate in time major cycle water to enter flow in refrigeration cycle water pipeline.
Because scraper condenser comprises horizontal cylinder and vertical cylinder, BDO spray equipment in vertical cylinder comprises the spiral nozzle of plural back taper, spiral nozzle is positioned at the different heights position of vertical cylinder, spiral nozzle sprays liquid BDO in the shape of a spiral, and in Multi-layers distributing, every one deck, all in curtain shape or tentiform, forms larger area and covers on the cross section of vertical cylinder, the collection efficiency of BDO steam is improved greatly, is beneficial to the vacuum tightness being formed and conform with processing requirement.
Accompanying drawing explanation
Fig. 1 is the structural representation of embodiment one;
Fig. 2 is the structural representation of spiral nozzle in embodiment one;
Fig. 3 is the structural representation of embodiment two;
Wherein: 1-vacuum pump, 2-polycondensation reaction device, 3-scraper condenser, 31-horizontal cylinder, 32-vertical cylinder, 33-rotating shaft, 34-scraper plate, 35-motor, 4-BDO vapour line, 5-BDO spray equipment, 51-spiral nozzle, the liquid BDO outlet of 6-, 7-BDO circulation line, 8-surge tank, 9-BDO recycle pump, 10-interchanger, 11-refrigeration cycle water pipeline, 12-water circulating pump, 13-major cycle water water inlet pipe, 14-major cycle water rising pipe, 15-diaphragm type pneumatic variable valve, 16-thermometer.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
Embodiment one
As Fig. 1 and Fig. 2 jointly shown in, a kind of for the BDO vacuum system in PBT production, comprise the scraper condenser 3 being communicated with vacuum pump 1 and polycondensation reaction device 2 respectively, scraper condenser 3 is communicated with polycondensation reaction device 2 by BDO vapour line 4, scraper condenser 3 high inside has installed BDO spray equipment 5, be provided with liquid BDO bottom scraper condenser 3 and export 6, liquid BDO outlet 6 is communicated with surge tank 8 successively by BDO circulation line 7, BDO recycle pump 9, interchanger 10 and BDO spray equipment 5, the entrance of cooling water of interchanger 10 is communicated with by refrigeration cycle water pipeline 11 with cooling water outlet, refrigeration cycle water pipeline 11 is provided with water circulating pump 12, refrigeration cycle water pipeline 11 near the feed-water end of water circulating pump 12 is communicated with major cycle water water inlet pipe 13, refrigeration cycle water pipeline 11 is positioned at major cycle water water inlet pipe 13 top position and is communicated with major cycle water rising pipe 14.
In the present embodiment, major cycle water water inlet pipe 13 is provided with diaphragm type pneumatic variable valve 15; Difference of altitude Δ H between major cycle water water inlet pipe 13 and major cycle water rising pipe 14 is 1 meter, and is provided with thermometer 16 on the refrigeration cycle water pipeline 11 of the feed-water end near water circulating pump 12.
In the present embodiment, scraper condenser 3 comprises horizontal cylinder 31 and vertical cylinder 32, rotating shaft 33 is provided with in horizontal cylinder 31, rotating shaft 33 is provided with the scraper plate 34 matched with horizontal cylinder 31 inwall, the tail end outside being positioned at horizontal cylinder 31 is provided with the motor 35 be in transmission connection with rotating shaft 33, the tail end top of horizontal cylinder 31 connects vertical cylinder 32, the top of vertical cylinder 32 connects vacuum pump 1 by pipeline, the head end top of horizontal cylinder 31 is communicated with BDO vapour line 4, be provided with liquid BDO bottom the tail end of horizontal cylinder 31 and export 6, BDO spray equipment 5 is provided with in vertical cylinder 32, BDO spray equipment 5 comprises the spiral nozzle 51 of a back taper.
The present embodiment introduces the temperature that the lower major cycle water of temperature regulates the cooling circulating water flowing through interchanger 10, and the water yield of the major cycle water of introducing can be regulated, make the temperature of cooling circulating water more stable, thus reaching liquid BDO temperature in accurate controls BDO circulation line 7 the object of 45 DEG C ± 0.5 DEG C, guarantee vacuum system can stablize the condition of negative pressure providing and conform with processing requirement.
Embodiment two
As shown in Figure 3, the present embodiment has substantially identical structure with embodiment one, its difference is, BDO spray equipment 5 comprises the spiral nozzle 51 of plural back taper, spiral nozzle 51 is positioned at the different heights position of vertical cylinder 32,, the situation being provided with two spiral nozzles 51 is only shown in accompanying drawing 2 in order to express easily, but is not limited to the situation being only provided with two spiral nozzles 51.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included within protection domain of the present utility model.
Claims (6)
1. one kind for PBT produce in BDO vacuum system, it is characterized in that, comprise the scraper condenser being communicated with vacuum pump and polycondensation reaction device respectively, described scraper condenser is communicated with polycondensation reaction device by BDO vapour line, described scraper condenser high inside has installed BDO spray equipment, be provided with liquid BDO bottom described scraper condenser to export, described liquid BDO outlet is communicated with surge tank successively by BDO circulation line, BDO recycle pump, interchanger and BDO spray equipment, the entrance of cooling water of described interchanger is communicated with by refrigeration cycle water pipeline with cooling water outlet, described refrigeration cycle water pipeline is provided with water circulating pump, refrigeration cycle water pipeline near the feed-water end of described water circulating pump is communicated with major cycle water water inlet pipe, described refrigeration cycle water pipeline is upper is communicated with major cycle water rising pipe in major cycle water water inlet pipe top position.
2. according to claim 1 for the BDO vacuum system in PBT production, it is characterized in that, described major cycle water water inlet pipe is provided with diaphragm type pneumatic variable valve.
3. according to claim 1 for the BDO vacuum system in PBT production, it is characterized in that, the difference of altitude between described major cycle water water inlet pipe and major cycle water rising pipe is 1 meter.
4. according to claim 1 produce for PBT in BDO vacuum system, it is characterized in that, the refrigeration cycle water pipeline of feed-water end near described water circulating pump is provided with thermometer.
5. according to the arbitrary claim of Claims 1-4 for PBT produce in BDO vacuum system, it is characterized in that, described scraper condenser comprises horizontal cylinder and vertical cylinder, rotating shaft is provided with in described horizontal cylinder, described rotating shaft is provided with the scraper plate matched with horizontal cylinder inwall, the tail end outside being positioned at described horizontal cylinder is provided with the motor be connected with described rotating shaft transmission, the tail end top of described horizontal cylinder connects vertical cylinder, the top of described vertical cylinder connects vacuum pump, the head end top of described horizontal cylinder is communicated with BDO vapour line, be provided with liquid BDO bottom the tail end of described horizontal cylinder to export, BDO spray equipment is provided with in described vertical cylinder, described BDO spray equipment comprises the spiral nozzle of more than one back taper.
6. according to claim 5 for the BDO vacuum system in PBT production, it is characterized in that, described BDO spray equipment comprises the spiral nozzle of plural back taper, and described spiral nozzle is positioned at the different heights position of vertical cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520050685.0U CN204417391U (en) | 2015-01-23 | 2015-01-23 | A kind of for the BDO vacuum system in PBT production |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520050685.0U CN204417391U (en) | 2015-01-23 | 2015-01-23 | A kind of for the BDO vacuum system in PBT production |
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| CN204417391U true CN204417391U (en) | 2015-06-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110961033A (en) * | 2019-12-09 | 2020-04-07 | 中国石油天然气集团有限公司 | High-stability high-vacuum method and high-vacuum system suitable for polycarbonate production |
-
2015
- 2015-01-23 CN CN201520050685.0U patent/CN204417391U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110961033A (en) * | 2019-12-09 | 2020-04-07 | 中国石油天然气集团有限公司 | High-stability high-vacuum method and high-vacuum system suitable for polycarbonate production |
| CN110961033B (en) * | 2019-12-09 | 2023-12-29 | 中国石油天然气集团有限公司 | High-stability high-vacuum method and high-vacuum system suitable for polycarbonate production |
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