CN102294127B - Vertical fractionating column, fractionating apparatus and application thereof - Google Patents
Vertical fractionating column, fractionating apparatus and application thereof Download PDFInfo
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- CN102294127B CN102294127B CN 201110166090 CN201110166090A CN102294127B CN 102294127 B CN102294127 B CN 102294127B CN 201110166090 CN201110166090 CN 201110166090 CN 201110166090 A CN201110166090 A CN 201110166090A CN 102294127 B CN102294127 B CN 102294127B
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Abstract
The invention relates to a vertical fractionating column used in a fractionation process in a resin producing reaction technology in chemical engineering. The fractionating column comprises a column body, a gas phase component inlet arranged on the bottom of the column body, a gas phase component outlet arranged on the top of the column body, a cooling water inlet arranged on the lower part of a side of the column body, a cooling water outlet arranged on the upper part of the side of the column body, and at least one gas conducting pipe arranged in the column body, wherein the upper terminal of the gas conducting pipe is connected to the gas phase component outlet, and the lower terminal of the gas conducting pipe is connected to the gas phase component inlet. A spiral separator is arranged in the column body. On the basis of the vertical fractionating column, the invention also provides a fractionating apparatus with the vertical fractionating column, and an application method thereof. The fractionating column and the fractionating apparatus provided by the invention have advantages of simple structure and easy operation. The fractionating column is not easy to get fouled, and can be effectively applied in fine fractionation of mixed gas components. With the fractionating column, effective thermal transmission can be carried out between gas and cooling water, fractionation efficiency can be improved, and finally the entire performance of the fractionating column can be improved.
Description
Technical field
The present invention relates to a kind of chemical industry resin production plant, the fractionating device that is specifically related to a kind of still and comprises this still.
Background technology
Fractionation is a kind of effectively method of separating mixed gas phase component, after the mixture steam seethed with excitement carries out a series of heat exchange by still, owing to being subject to the cooling of cooling water, in steam, high boiling component is cooled to liquid, pass back in reactor, in the steam risen, containing lower boiling component, relatively increase, in refluxing way, condensate liquid runs into the steam of rising, carry out again heat exchange between the two, in the steam risen, high boiling component is condensed again, lower boiling component still continues to rise, volatile component increases again relatively, so in still, repeatedly carrying out vaporization-condensation-backflow supervisor, when the efficiency of still is quite high and operate when correct, at the still top, steam out is just close to pure lower boiling component, the different separating substances of boiling point out the most at last.
Traditional synthetic technology of resins is comprised of high-temperature polycondensation and low temperature dilution two parts usually, and wherein, the high-temperature polycondensation process is in the pyroreaction still, and binary acid and dihydroxylic alcohols are carried out to polycondensation in 210 ℃ of high temperature under nitrogen protection, generates mylar and molecular water.Usually by the reflux column on reactor, water byproduct steam and reactant steam are carried out to fractionation, steam is discharged, the reactant condensing reflux.Therefore, the effect of fractionation greatly affects quality and the rate of recovery of product in polycondensation process, significant in environmental protection, energy-saving square mask.At present, the efficiency of vertical still commonly used is lower, often cause answering the portioned product material of condensing reflux not reach the effect of fractionation, and flow to wastewater disposal basin, the treatment cost of waste water is increased, its major defect is embodied in: (1) vertical still hypomere adopts random Bao ring fillers of filling, and makes the still liquid phase because load is relatively too small and skewness, gas-liquid contact are poor, easily cause gas " short circuit ", be difficult to reach distilling effect; (2) the shell and tube condenser material on vertical still top is stainless steel, the outer circulating cooling water cooling that adopts of pipe, the shell and tube condenser for want of gas-liquid contact of necessity does not have fractionating effect, the condensing cooling effect is only arranged, to realize the effective cooling condensation of low molecule organic matter in water vapour, reduce loss of material; Because vertical still cooling water side mobility is poor, be equivalent to pond cooling, have many flow dead, and the following current cooling effect is also relatively poor, makes the process heat-transfer effect poor; The large temperature difference heat exchange that the recirculated cooling water side is hanged down flow velocity, shell and tube condenser makes recirculated cooling water be easy to fouling, greatly the condensing cooling effect of low molecule organic matter in the interior water vapour of impact pipe; (3) solid raw material such as phthalic anhydride and cis-butenedioic anhydride at a lower temperature (60-80 ℃) can sublimate, due to liquid phase load less in vertical cold still, and liquid distribution is extremely inhomogeneous, the large different transfer of heat that adds shell and tube condenser causes the steam chilling of carrying part phthalic anhydride and cis-butenedioic anhydride secretly, easily separate out solid phthalic anhydride and cis-butenedioic anhydride, so the solid phthalic anhydride of separating out after the device long operational time and cis-butenedioic anhydride wash away and very easily accumulate on vertical cold still because lacking necessary liquid phase, stop up filler passage.
The Chinese patent that publication number is CN200963588 discloses a kind of still, it arranges drawing of a plurality of hollow tubular structures and heats up in a steamer body in the fractionation cylinder, and be connected with space outerpace, heat up in a steamer body and introduce extraneous air and carry out heat exchange by drawing, thermograde in still is increased, reached certain fractionating effect, but it carries out cooling fractionation by air, be subject to external environment influence large, fractionating efficiency is low, and fractionating effect can further improve.
Summary of the invention
The objective of the invention is the technical problem that will solve for above, provide a kind of simple in structure, easy to operate, still is less scaling, can significantly improve the vertical still of condensing heat-exchange effect.
Another object of the present invention is to provide a kind of fractionating device that comprises described vertical still.
A further object of the present invention is to provide a kind of method of applying described fractionating device fractionation gaseous mixture phase component.
To achieve these goals, the present invention is by the following technical solutions:
A kind of vertical still, comprise cylinder, this cylinder bottom is provided with the gaseous component import, top is provided with the gaseous component outlet, and the bottom, side is provided with cooling water inlet, and top, side is provided with coolant outlet, at least one wireway is set in described cylinder, this wireway upper end connects described gaseous component outlet, and lower end connects described gaseous component import, in described cylinder, is provided with helical baffle.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
Vertical still provided by the invention, described helical baffle is the spiral structure and is installed in described inboard wall of cylinder.
Vertical still provided by the invention, the adjacent two layers spacing of described helical baffle can be regulated.
The present invention also provides a kind of fractionating device, it is characterized in that vertical still of the present invention.
Further, fractionating device provided by the invention also comprises circulating water cooling device and liquid transporting apparatus, described circulating water cooling device top is provided with environment temperature water out and circulating water intake, its underpart is provided with environment temperature water inlet and circulating water outlet, described liquid transporting apparatus two ends connect respectively circulating water outlet and cooling water inlet, and the coolant outlet on described vertical still is connected with the circulating water intake on described circulating water cooling device.
According to fractionating device of the present invention, described circulating water cooling device is shell-and-tube exchanger.
According to fractionating device of the present invention, described circulating water cooling device is heat-exchangers of the plate type.
According to fractionating device of the present invention, described liquid transporting apparatus is water pump.
The present invention also further provides a kind of method of applying fractionating device fractionation gaseous mixture phase component of the present invention, comprises the following steps:
1) cooling water flows into the still cylinder with the flow of 60～80 ℃, 3～8 tons/hour from cooling water inlet, and the gaseous mixture phase component enters wireway with 140～200 ℃ from the gaseous component import;
2) the gaseous mixture phase component carries out heat exchange through wireway and cooling water in uphill process, and high boiling component wherein is cooled to liquid by the gaseous component circumfluence, and low boiling component is discharged from the gaseous component outlet with 102～150 ℃;
3) environment temperature water flows into circulating water cooling device with the flow of 15～35 ℃, 4～10 tons/hour by the environment temperature water inlet, cooling water is with 70～100 ℃ of outflow still cylinders of temperature, flow into circulating water cooling device via circulating water intake, flow out circulating water cooling device from circulating water outlet after being cooled to 60～80 ℃, and be delivered to the still cylinder by liquid transporting apparatus and recycled, environment temperature water flows out circulating water cooling devices with 25～45 ℃ of temperature.
In vertical still provided by the invention, treat the fractionation mist for what need partial condensation in described wireway, between the outer and inboard wall of cylinder of wireway, be cooling water.By between inboard wall of cylinder and wireway, helical baffle being set, can making the recirculated cooling water flow speed stability, improve the inside and outside heat and mass effect of wireway.In the situation that keep volume flow constant, can be by adjusting the optimization spacing of determining helical baffle with parameters such as the flow velocity of determining cooling water, film heat transfer coefficient, out temperatures.By controlling the inlet temperature of cooling water, make to manage interior industrial chemicals and produce fractionating effect but can not sublimate formation obstruction in pipe in uphill process.In still, the outer cooling water of tube bank is usingd the bottom of still as import, take top as outlet, by adopting the intensified heat transfer methods such as flow-disturbing and water conservancy diversion device are set in wireway to improve water vapour convective heat-transfer coefficient in pipe, so that in pipe, steam mixture is optimized along the journey Temperature Distribution, strengthen to greatest extent the condensation effect of organic component in gas phase.After the cooling water of vertical still of the present invention is conducted heat, enter the circulating water cooling device be connected with still, to reduce its temperature and to realize that it recycles.
Compared with prior art, the present invention has following obvious advantage: by the helical baffle structure is set in cylinder, and determine flexibly and regulate clapboard spacing as the case may be, can effectively solve the low flow velocity of recirculated cooling water side, recirculated cooling water is easy to fouling, raw material and forms at a lower temperature and sublimate and then the actual motion problem such as blocking pipe, and significantly improve heat and mass effect and fractionating efficiency, finally improve the overall performance of still.
The accompanying drawing explanation
Fig. 1 is the structural representation of vertical still of the present invention.
Fig. 2 is the structural representation of fractionating device of the present invention.
Wherein, 1: cooling water inlet 2: coolant outlet 3: gaseous component import 4: gaseous component outlet 5: cylinder 51: helical baffle 52: wireway 6: water pump 7: circulating water cooling device 8: environment temperature water inlet 9: environment temperature water out 10: circulating water intake 11: circulating water outlet
The specific embodiment
Technological means and the effect for further setting forth the present invention, to reach predetermined goal of the invention, taked, below in conjunction with embodiment and accompanying drawing, vertical still, fractionating device and application process thereof that the present invention is proposed are described in detail as follows.
As shown in Figure 1, vertical still of the present invention, comprise cylinder 5, cylinder 5 bottoms are provided with gaseous component import 3, cylinder 5 tops are provided with gaseous component outlet 4, and cylinder 5 bottoms, side are provided with cooling water inlet 1, and cylinder 5 tops, side are provided with coolant outlet 2.The interior at least one wireway 52 that arrange of described cylinder 5, this wireway 52 also can be chosen as many and form air guide tube bank according to actual needs.These wireway 52 upper ends connect described gaseous component outlet 4, and lower end connects described gaseous component import 3, in described cylinder 5, is provided with helical baffle 51.Described helical baffle 51 preferably is the spiral structure and is installed in described inboard wall of cylinder, makes it be easy to fix.Spacing between described helical baffle 51 adjacent two layers, preferably can carry out flexible modulation according to the flow of cooling water and the specific requirement of the wireway 52 outer coefficients of heat transfer.In the situation that keep volume flow constant, can be by adjusting the optimization spacing of determining helical baffle 51 with parameters such as the flow velocity of determining cooling water, film heat transfer coefficient, out temperatures.Cooling water enters in cylinder 5 from cooling water inlet 1, through helical baffle 51 water conservancy diversion, from bottom to top, flows, and controls its flow velocity to reach best heat-transfer effect; Pass into the gaseous mixture phase component by gaseous component import 3 in wireway 52, gaseous component carries out heat exchange through wireway 52 and cooling water in uphill process, wherein high boiling component is cooled to liquid, and refluxes through gaseous component import 3, and low boiling component is discharged from gaseous component outlet 4.Cooling water in cylinder 5, after heat exchange, is flowed out by coolant outlet 2.
As shown in Figure 2, be the structural representation of fractionating device provided by the invention, it comprises vertical still 5 of the present invention, water pump 6 and circulating water cooling device 7.Described circulating water cooling device 7 tops are provided with circulating water intake 10 and environment temperature water out 9, and its underpart is provided with circulating water outlet 11 and environment temperature water inlet 8.Described water pump 6 two ends connect respectively cooling water inlet 1 and circulating water outlet 11.Coolant outlet 2 on described vertical still 5 is connected with the circulating water intake 10 on circulating water cooling device 7.Pass into environment temperature water in circulating water cooling device 7, the cooling water flowed out in cylinder 5 flows into circulating water cooling device 7 through circulating water intake 10, and, after utilizing environment temperature water to be lowered the temperature, circulating water cooling device 7 is transmitted back to cooling water vertical still 5 from cooling water inlet 1 by water pump 6.
For improving the heat exchange effect of circulating water cooling device, described circulating water cooling device 7 is preferably shell-and-tube exchanger or heat-exchangers of the plate type.
Apply the method that fractionating device of the present invention carries out the fractionation mixing gas component, comprise following concrete steps:
1) cooling water flows into still cylinder 5 with the flow of 60～80 ℃, 3～8 tons/hour from cooling water inlet 1, and the gaseous mixture phase component enters wireway 52 with 140～200 ℃ from gaseous component import 3;
2) spacing of adjustable screw dividing plate 51 is to determine the flow velocity of cooling water, the gaseous mixture phase component carries out heat exchange through wireway 52 and cooling water in uphill process, high boiling component wherein is cooled to liquid and refluxes by gaseous component import 3, and low boiling component is discharged from gaseous component outlet 4 with 102～150 ℃;
3) environment temperature water flows into circulating water cooling devices 7 with the flow of 15～35 ℃, 4～10 tons/hour by environment temperature water inlet 8, cooling water flows out still cylinder 5 with 70～100 ℃ of temperature through coolant outlet 2, flow into circulating water cooling device 7 via circulating water intake 10, flow out circulating water cooling device 7 from circulating water outlet 11 after being cooled to 60～80 ℃, and be delivered to cooling water inlet 1 by water pump 6 and enter still cylinder 5 and recycle, environment temperature water flows out circulating water cooling devices 7 with 25～45 ℃ of temperature from environment temperature water out 9.
After a period of time is carried out in operation, in order to prevent scale formation, and don't affect the effect of condensation, should suitably improve step 3) described in more than cooling water circulation enters the temperature to 60 ℃ at cooling water inlet 1 place.
Concrete Application Example:
1, take the vertical still of 80 kilowatts of thermic loads is example, and in reactor, reactant steam and water byproduct steam are sentenced 160 ℃ while entering still cylinder 5 in gaseous component import 3, export 4 place's temperature at gaseous component and are not less than 102 ℃; And cooling water inlet 1 place, cooling water be take temperature and is flow to still cylinder 5 as 65 ℃, flow as 5 tons/hour, and when helical baffle 51 arrives coolant outlet 2 place, temperature is 79 ℃;
2, at a circulating water cooling device 7 of still main body 5 outside connections, reduce the temperature of cooling water with circulation, with the cooling water circulation in water pump 6 thrust units, flow, and the temperature of cooling water at cooling water inlet 1 place in maintenance still cylinder 5 reaches 65 ℃; The extraneous environment temperature water of circulating water cooling device 7 use carries out cooling, with the flows of 7 tons/hour, the temperature of 32 ℃, at environment temperature water inlet 8 places, flows to circulating water cooling device 7, and when ambient water exports 9 places and flows out, water temperature is 42 ℃.
Application result in actual chemical industry production of resins shows, between inboard wall of cylinder and wireway, helical baffle is set owing to adopting, the uniform and stable non-scaling of circulating cooling water flow velocity, the inside and outside heat and mass effect of wireway significantly improves, do not occur that mist is sublimated and the situation of stopping up wireway, the fractionation performance excellence.
Above embodiment only, for technical scheme of the present invention is described, is not intended to limit; Although with reference to preferred embodiment, the present invention is had been described in detail; those of ordinary skill in the field are to be understood that; still can modify or the part technical characterictic is equal to replacement the specific embodiment of the present invention; and not breaking away from the spirit of technical solution of the present invention, it all should be encompassed in the middle of the technical scheme scope that the present invention asks for protection.
Claims (1)
1. a fractionating device, comprise following vertical still, this vertical still is comprised of cylinder and the wireway and the helical baffle that are arranged in cylinder, this cylinder bottom is provided with the gaseous component import, top is provided with the gaseous component outlet, the bottom, side is provided with cooling water inlet, top, side is provided with coolant outlet, at least one wireway is set in described cylinder, this wireway upper end connects described gaseous component outlet, lower end connects described gaseous component import, it is characterized in that: in described cylinder, be provided with helical baffle, described helical baffle is the spiral structure and is installed in described inboard wall of cylinder, the adjacent two layers spacing of described helical baffle can be regulated.
2. fractionating device according to claim 1, it is characterized in that being formed by described vertical still, circulating water cooling device and liquid transporting apparatus, described circulating water cooling device top is provided with environment temperature water out and circulating water intake, its underpart is provided with environment temperature water inlet and circulating water outlet, described liquid transporting apparatus two ends connect respectively circulating water outlet and cooling water inlet, and the coolant outlet on described vertical still is connected with the circulating water intake on described circulating water cooling device.
3. fractionating device according to claim 2, it is characterized in that: described circulating water cooling device is shell-and-tube exchanger.
4. fractionating device according to claim 2, it is characterized in that: described circulating water cooling device is heat-exchangers of the plate type.
5. fractionating device according to claim 2, it is characterized in that: described liquid transporting apparatus is water pump.
6. a right to use requires the method for 2 described fractionating device fractionation gaseous mixture phase components, it is characterized in that comprising the following steps:
1) cooling water flows into the still cylinder with the flow of 60～80 ℃, 3～8 tons/hour from cooling water inlet, and the gaseous mixture phase component enters wireway with 140～200 ℃ from the gaseous component import;
2) the gaseous mixture phase component carries out heat exchange through wireway and cooling water in uphill process, and high boiling component wherein is cooled to liquid by the gaseous component circumfluence, and low boiling component is discharged from the gaseous component outlet with 102～150 ℃;
3) environment temperature water flows into circulating water cooling device with the flow of 15～35 ℃, 4～10 tons/hour by the environment temperature water inlet, cooling water is with 70～100 ℃ of outflow still cylinders of temperature, flow into circulating water cooling device via circulating water intake, flow out circulating water cooling device from circulating water outlet after being cooled to 60～80 ℃, and be delivered to the still cylinder by liquid transporting apparatus and recycled, environment temperature water flows out circulating water cooling devices with 25～45 ℃ of temperature.
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| CN106039753B (en) * | 2016-07-08 | 2018-12-04 | 韦睿轩 | A kind of gas fractionation unit and fractionating system |
| CN113398615B (en) * | 2021-06-22 | 2022-02-11 | 浙江凯德化工有限公司 | Fractionation system and fractionation method thereof |
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2011
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| GB2048698A (en) * | 1979-05-11 | 1980-12-17 | Eardley D | Rapid response distillation method and apparatus for use therein |
| US4308131A (en) * | 1980-06-02 | 1981-12-29 | Shell Oil Company | Method of improving thermal efficiency of sidedraw fractionating columns |
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