CN104697296B - The drying system of the moisture thin slice of a kind of Merlon and drying process - Google Patents
The drying system of the moisture thin slice of a kind of Merlon and drying process Download PDFInfo
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- CN104697296B CN104697296B CN201510084510.6A CN201510084510A CN104697296B CN 104697296 B CN104697296 B CN 104697296B CN 201510084510 A CN201510084510 A CN 201510084510A CN 104697296 B CN104697296 B CN 104697296B
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Abstract
The present invention relates to the drying system of the moisture thin slice of a kind of Merlon and drying process, the polycarbonate sheet of moisture 28-30% is delivered in primary exsiccator, it is dried under the effect of 140～160 DEG C of nitrogen, obtain the polycarbonate sheet of moisture 10～12%, the polycarbonate sheet of moisture 10～12% is then transferred to secondary exsiccator, it is dried under the effect of 140～160 DEG C of nitrogen, obtain the polycarbonate sheet of moisture 2～3%, the polycarbonate sheet of moisture 2～3% is finally transported in three-stage drying device, the nitrogen of 120～130 DEG C is dried, obtain the polycarbonate sheet dried.Present invention achieves polycarbonate sheet water content and be reduced to below 1000ppm from 30%, thoroughly eliminate the surface water of thin slice and interior interior edema, optimize the working environment of thin slice conveying, storage and extruding pelletization；Nitrogen circulation uses, and improves utilization ratio, reduces energy resource consumption, it is achieved continuous prodution, improves efficiency.
Description
Technical field
The present invention relates to the drying system of the moisture thin slice of a kind of Merlon and drying process.
Background technology
The polycarbonate resin (being called for short PC) prepared with phosgene interface fasculation method by bisphenol-A, it is the engineering plastics of high comprehensive performance, there are high transparent, excellent impact strength, thermostability, tolerance to cold, dimensional stability and electrical insulating property etc. and be widely used in various uses, for instance be applied to manufacture auto parts, optical element etc..Polycarbonate production technological process mainly by be synthesized, wash separation, concentration the operation such as air elutriation, drying-granulating form.In polycarbonate production technique, drying process is important operating unit, and drying effect directly influences product quality.In polycarbonate production technique, polycondensation product is the dichloromethane solution of PC, adopts the dichloromethane solution of high steam stripping PC, produces the polycarbonate sheet of moisture 30%.The moisture height of this thin slice, not easily carries, not easily stores, and cannot directly enter extruder machine-shaping.Therefore, it is necessary to moisture thin slice is dried process, thoroughly remove the moisture of moisture thin slice.In commercial production, the major way of dry polycarbonate has spray drying to add fluid bed combining form, centrifugation adds the dry combining form of blade etc..These more traditional drying modes are all that Merlon powder is dried, so being all not applied for the dry of the moisture thin slice of Merlon.
Summary of the invention
It is an object of the invention to provide the drying system of the moisture thin slice of a kind of Merlon and drying process, the problem higher to solve polycarbonate sheet water content.
For achieving the above object, the present invention adopts following technical proposals:
A kind of drying system of the moisture thin slice of Merlon, including primary exsiccator, secondary exsiccator, three-stage drying device, heater and nitrogen recycling drying device, wherein, the material outlet of primary exsiccator communicates with the material inlet of secondary exsiccator, and the secondary material outlet of exsiccator communicates with the material inlet of three-stage drying device；The nitrogen inlet end of described three-stage drying device communicates with the nitrogen outlet end of heater, the nitrogen inlet end of heater communicates with the nitrogen outlet end of nitrogen recycling drying device, the nitrogen outlet end of three-stage drying device communicates with the nitrogen inlet end of the nitrogen inlet end of primary exsiccator and secondary exsiccator respectively, the nitrogen inlet end of secondary exsiccator communicates with the nitrogen outlet end of three-stage drying device and the nitrogen outlet end of nitrogen recycling drying device respectively, the nitrogen outlet end of secondary exsiccator communicates with the nitrogen inlet end of primary exsiccator and nitrogen recycling drying device respectively, the nitrogen outlet end of primary exsiccator communicates with nitrogen recycling drying device.
Preferably, described primary exsiccator and secondary exsiccator are fluidized bed dryer.
Preferably, described three-stage drying device is Roof-dryer.
Preferably, described heater is tubulation shell-and-tube heat exchanger.
A kind of drying process of the moisture thin slice of Merlon, step is as follows: the polycarbonate sheet of moisture 28-30% is delivered in primary exsiccator, it is dried under the effect of 140～160 DEG C of nitrogen, obtain the polycarbonate sheet of moisture 10～12%, the polycarbonate sheet of moisture 10～12% is then transferred to secondary exsiccator, it is dried under the effect of 140～160 DEG C of nitrogen, obtain the polycarbonate sheet of moisture 2～3%, the polycarbonate sheet of moisture 2～3% is finally transported in three-stage drying device, the nitrogen of 120～130 DEG C is dried, obtain the polycarbonate sheet dried.The effect of heater is to maintain the temperature of the nitrogen inside Roof-dryer and is maintained at 120～130 DEG C.
Preferably, described nitrogen is at primary exsiccator, secondary exsiccator and three-stage drying device internal recycle.
Preferably, secondary fluid bed nitrogen outlet end arranges nitrogen on-line measuring device, if nitrogen water content is less than 5%, circulation is to one-level exsiccator, if nitrogen water content is higher than 5%, circulates to nitrogen recycling drying device；Three-stage drying device nitrogen outlet end arranges nitrogen on-line measuring device, if nitrogen water content is less than 2%, nitrogen circulation is to secondary drying device, if nitrogen water content is more than 2%, less than 5%, nitrogen circulation is to one-level exsiccator, when nitrogen aerofluxus water content is higher than 5%, it is delivered to nitrogen recycling drying device；Dried nitrogen, heater via heat cycles returns three-stage drying device.
Preferably, described dry polycarbonate sheet is the water content polycarbonate sheet lower than 1000ppm.
The method have the benefit that: present invention achieves polycarbonate sheet water content and be reduced to below 1000ppm from 30%, thoroughly eliminate the surface water of thin slice and interior interior edema, optimize the working environment of thin slice conveying, storage and extruding pelletization；Nitrogen circulation uses, and improves utilization ratio, reduces energy resource consumption, it is achieved continuous prodution, improves efficiency.
Accompanying drawing explanation
Fig. 1 is the system flow chart of the present invention.
Wherein, 1, primary fluidised bed dryer, 2, secondary fluidized bed dryer, 3, Roof-dryer, 4, heater, 5, nitrogen recycling drying device, 6 thin slice storage facilities.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is further described.
As shown in Figure 1, a kind of drying system of the moisture thin slice of Merlon, including primary fluidised bed dryer 1, secondary fluidized bed dryer 2, Roof-dryer3, heater 4 and nitrogen recycling drying device 5, wherein, the material outlet of primary fluidised bed dryer 1 communicates with the material inlet of secondary fluidized bed dryer 2, and the secondary material outlet of fluidized bed dryer 2 communicates with the material inlet of Roof-dryer3；The nitrogen inlet end of described Roof-dryer3 communicates with the nitrogen outlet end of heater 4, the nitrogen inlet end of heater 4 communicates with the nitrogen outlet end of nitrogen recycling drying device 5, the nitrogen outlet end of Roof-dryer3 communicates with the nitrogen inlet end of the nitrogen inlet end of primary fluidised bed dryer 1 and secondary fluidized bed dryer 2 respectively, the nitrogen inlet end of secondary fluidized bed dryer 2 communicates with the nitrogen outlet end of Roof-dryer3 and the nitrogen outlet end of nitrogen recycling drying device 5 respectively, the nitrogen outlet end of secondary fluidized bed dryer 2 communicates with the nitrogen inlet end of primary fluidised bed dryer 1 and nitrogen recycling drying device 5 respectively, the nitrogen outlet end of primary fluidised bed dryer 1 communicates with nitrogen recycling drying device 5.
Described heater 4 is tubulation shell-and-tube heat exchanger.
A kind of moisture thin slice drying process of Merlon, step is as follows:
1) polycarbonate sheet of moisture 28-30% is delivered to primary fluidised bed dryer 1, passes into temperature 140～160 DEG C of high temperature nitrogen, and pulse of nitrogen stream can accelerate surface evaporation of water in primary fluidised bed dryer 1, thus reducing sheet surface water content；Under nitrogen purge, polycarbonate sheet is in fluidized state, it is achieved comprehensive nitrogen contacts, it is ensured that removes surface water, makes the water content of polycarbonate sheet be reduced to 10～12%.
2) polycarbonate sheet of moisture 10～12%, is delivered to secondary fluidized bed dryer 2, passes into 140～160 DEG C of high temperature nitrogen, thin slice is further dried, it is ensured that sheet surface water thoroughly removes, make the moisture of polycarbonate sheet be reduced to 2～3%；The nitrogen tail gas of secondary fluidized bed dryer 2 enters primary fluidised bed dryer 1 through blower fan.
3) thin slice of moisture 2～3% is delivered to Roof-dryer3, passes into 120～130 DEG C of drying nitrogens.The step-type multi-step nitrogen of Roof-dryer3 dries, extend thin slice residence time in exsiccator, also go deep under sheet surface simultaneously, be completely separated interior interior edema, guaranteeing that in thin slice, water content reaches below 1000ppm, dried polycarbonate sheet enters thin slice storage facilities 6.
4) the nitrogen aerofluxus of secondary fluidized bed dryer 2 is arranged on line analysis, if water content is less than 5%, circulates to primary fluidised bed dryer 1；Roof-dryer3 nitrogen outlet arranges on-line checking, if water content is less than 2%, circulation is to secondary fluidized bed dryer 2, if nitrogen water content is more than 2%, less than 5%, then returns primary fluidised bed dryer 1；When nitrogen water content is higher than 5%, being delivered to nitrogen recycling drying device 5 and process, dried nitrogen heater via 4 heat cycles returns Roof-dryer3.
The specific embodiment of the present invention is described in conjunction with accompanying drawing although above-mentioned; but the not restriction to invention protection domain; one of ordinary skill in the art should be understood that; on the basis of technical scheme, those skilled in the art need not pay various amendments or deformation that creative work can make still in protection scope of the present invention.
Claims (8)
1. the drying system of the moisture thin slice of Merlon, it is characterized in that: include primary exsiccator, secondary exsiccator, three-stage drying device, heater and nitrogen recycling drying device, wherein, the material outlet of primary exsiccator communicates with the material inlet of secondary exsiccator, and the secondary material outlet of exsiccator communicates with the material inlet of three-stage drying device；The nitrogen inlet end of described three-stage drying device communicates with the nitrogen outlet end of heater, the nitrogen inlet end of heater communicates with the nitrogen outlet end of nitrogen recycling drying device, the nitrogen outlet end of three-stage drying device communicates with the nitrogen inlet end of the nitrogen inlet end of primary exsiccator and secondary exsiccator respectively, the nitrogen inlet end of secondary exsiccator communicates with the nitrogen outlet end of three-stage drying device and the nitrogen outlet end of nitrogen recycling drying device respectively, the nitrogen outlet end of secondary exsiccator communicates with the nitrogen inlet end of primary exsiccator and nitrogen recycling drying device respectively, the nitrogen outlet end of primary exsiccator communicates with nitrogen recycling drying device；
The nitrogen outlet end of described secondary exsiccator is arranged on line detector, if nitrogen water content is less than 5%, and the extremely primary exsiccator of circulation, if nitrogen water content is higher than 5%, circulation is to nitrogen recycling drying device, dried nitrogen, and heater via heat cycles returns three-stage drying device；
Three-stage drying device nitrogen outlet end arranges nitrogen on-line measuring device, if nitrogen water content is less than 2%, nitrogen circulation is to secondary exsiccator, if nitrogen water content is more than 2%, less than 5%, and the extremely primary exsiccator of nitrogen circulation.
2. drying system according to claim 1, it is characterised in that: described primary exsiccator and secondary exsiccator are fluidized bed dryer.
3. drying system according to claim 1, it is characterised in that: described three-stage drying device is Roof-dryer.
4. drying system according to claim 1, it is characterised in that: described heater is tubulation shell-and-tube heat exchanger.
5. drying system according to claim 1, it is characterized in that: the drying process of described drying system comprises the following steps that the polycarbonate sheet of moisture 28-30% is delivered in primary exsiccator, it is dried under the effect of 140～160 DEG C of nitrogen, obtain the polycarbonate sheet of moisture 10～12%, the polycarbonate sheet of moisture 10～12% is then transferred to secondary exsiccator, it is dried under the effect of 140～160 DEG C of nitrogen, obtain the polycarbonate sheet of moisture 2～3%, the polycarbonate sheet of moisture 2～3% is finally transported in three-stage drying device, the nitrogen of 120～130 DEG C is dried, obtain the polycarbonate sheet dried.
6. drying system according to claim 5, it is characterised in that: described nitrogen is at primary exsiccator, secondary exsiccator and three-stage drying device internal recycle.
7. drying system according to claim 5, it is characterised in that: described primary exsiccator and secondary exsiccator are fluidized bed dryer；Described three-stage drying device is Roof-dryer；Described heater is tubulation shell-and-tube heat exchanger.
8. drying system according to claim 5, it is characterised in that: described dry polycarbonate sheet is the water content polycarbonate sheet lower than 1000ppm.
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| CN201510084510.6A CN104697296B (en) | 2015-02-16 | 2015-02-16 | The drying system of the moisture thin slice of a kind of Merlon and drying process |
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| CN104697296B true CN104697296B (en) | 2016-07-06 |
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| CN106052322B (en) * | 2016-07-18 | 2019-03-08 | 长沙开元仪器股份有限公司 | A kind of gas-saving type protective gas drying box |
| CN111750625A (en) * | 2019-03-26 | 2020-10-09 | 湖南三德科技股份有限公司 | Nitrogen-introducing drying method and device for sample drying |
| CN112595033B (en) * | 2020-12-10 | 2022-11-08 | 万华化学集团股份有限公司 | Preparation method of polycarbonate powder with stable color |
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| CN100404989C (en) * | 2002-12-18 | 2008-07-23 | 兰州瑞德干燥技术有限公司 | Nitrogen-cycle engineering plastic air current and fluidized bed drying method |
| CN102620526B (en) * | 2012-03-16 | 2014-05-21 | 甘肃银光聚银化工有限公司 | Method for drying poly carbonate (PC) |
| JP5391358B2 (en) * | 2013-06-14 | 2014-01-15 | 株式会社カワタ | Drying apparatus and inert gas replacement method |
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