CN101314085A - Balancing pipe type polymer solution steam stripping flocculation separation method and apparatus - Google Patents
Balancing pipe type polymer solution steam stripping flocculation separation method and apparatus Download PDFInfo
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- CN101314085A CN101314085A CNA2008101381984A CN200810138198A CN101314085A CN 101314085 A CN101314085 A CN 101314085A CN A2008101381984 A CNA2008101381984 A CN A2008101381984A CN 200810138198 A CN200810138198 A CN 200810138198A CN 101314085 A CN101314085 A CN 101314085A
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Abstract
The invention belongs to the polymer production technical field, relating to a separation method for a polymer solution of synthetic rubber, synthetic resin and plastic by stripping and condensation and a device for carrying out the same. The connection type of a connecting pipeline, through which polymer grainy water flows from a liquid phase of a first condensation boiler into a liquid phase of a second condensate pot in a two-boiler condensation process, is changed from a closed tube to a balance tube, to make the liquid phase of the first condensation boiler connected with a gas phase of the second condensation boiler, that is, the polymer grainy water flows from the liquid phase of the first condensation boiler directly into the upper gas phase of the second condensation boiler, such that the two levels of the two condensation boilers are independent and non-interfering and capable of conducting stable operation. Compared with prior art, the device has the advantages of simple and new structure, convenient operation, stable work and effectively improves the efficiency of stripping, and saves energy.
Description
Technical field:
The invention belongs to the polymer production technical field, relate to polymer solution steam stripping flocculation separation method and devices thereof such as a kind of synthetic rubber, synthetic resin and plastics.
Background technology:
The polymer solution that solution polymerization process obtains generally adopts in hot water steam stripping coacervation method with polymer and separated from solvent at present. and extensively adopt many stills condensation technique (two or more stirred tanks series connection) on flocculating result and energy consumption, to be better than early stage single still cohesion and tower condensation technique (Yu Leshun at present, China Synthetic Rubber Industry, 1978,1 (5), 1; Beijing Yanshan Petrochemical Company triumph chemical plant, China Synthetic Rubber Industry, 1978,1 (4), 1; Zhao Duoshan, China Synthetic Rubber Industry, 1986,9 (5), 318; Xu Shiai etc., China Synthetic Rubber Industry, 1997,20 (6), 369). Yu Leshun, China Synthetic Rubber Industry, 1980,3 (3), 145.Polymer beads water in existing two stills cohesion flow processs of using on producing between two stills is to adopt the cross over pipe form to connect, i.e. the liquid phase of the first cohesion still formation cross over pipe type of attachment that links to each other with the liquid phase of the second cohesion still.Because the pressure of two stills does not wait and causes liquid level not wait, just the pressure reduction of two stills is to come balance by the liquid level of two stills.Because in practical operation, the still pressure is subject to multiple factor affecting and fluctuates, particularly first condenses still.So directly cause the also fluctuation thereupon of liquid level of two stills, very big to the stable operation influence, even second material that condenses still turns back to the first cohesion still by cross over pipe phenomenon can take place when the pressure of the first cohesion still reduces suddenly.In order to overcome above-mentioned phenomenon, many process units have added a particle water pump on former cross over pipe and adjusting is cut down, and can make the liquid level control of cohesion still stable.But also do not break away from the type of attachment of cross over pipe, and the particle water pump also is prone to clogging.
Summary of the invention:
The objective of the invention is to overcome the shortcoming that exists in the prior art, seek to design method and the device thereof that a kind of new type of polymer solution steam stripping flocculation separates, is the improvement to existing method and device thereof.
To achieve these goals, the present invention enters the second cohesion still liquid phase connecting line with the polymer beads water that flows out from the first cohesion still liquid phase in the traditional double still cohesion flow process and changes the balance pipe type of attachment into by the type of attachment of original cross over pipe, the liquid phase of the first cohesion still is linked to each other with the vapour phase of the second cohesion still, promptly the polymer beads water that flows out from first liquid phase of condensing still directly enters the second top vapour phase of condensing still, the liquid level of two cohesion stills is not independently disturbed mutually, can be carried out stable operation.In the production operation of stable process conditions, the balance pipe between two stills exceeds the pressure reduction that first height that condenses the still liquid level is equal to or less than two stills; The fluctuation that the first cohesion still still is pressed in normal range (NR) is to come balance by the logistics height in the balance pipe, does not influence the liquid level of two stills; In order to adapt to the needs (as improving operating pressure) that the first cohesion still still is pressed to be increased, some outlets and each outlet can be set at balance pipe differing heights place be shaped on respectively, keep pressing the outlet of selecting differing heights according to its still under the constant prerequisite of the first cohesion still liquid level by cutting down; Cut down with the pressure of controlling the first cohesion still at any time and the variation of liquid level in that an adjusting is installed from the first polymer beads water pipeline that come out of cohesion still, rely on the pressure reduction transferring polymer particle water of two stills and save the particle water pump.
. the present invention reclaims about solvent more than 95% at the first cohesion still, and in order to reduce the steam consumption, the first cohesion still is operated under higher operating pressure and is generally 0.02～0.08MPa (gauge pressure); The second cohesion still for the ease of at the solvent of polymer beads inside to external diffusion and steam, all under lower operating pressure, operate, be generally 0.001～0.04MPa (gauge pressure).Therefore, the pressure reduction of two cohesion stills is at 0.01～0.06MPa, can need not additionaling power fully by this pressure reduction polymer beads water is transported to the second cohesion still from the first cohesion still, be particularly suitable for the steam stripping coacervation process of solwution method synthetic rubber and plastics and resin.
The present invention is according to coacervation process mechanism, operating pressure at two cohesion stills of two still coacervation processes is not wait, and the operating pressure P1 of the first cohesion still is greater than the operating pressure P2 of the second cohesion still, because traditional cross over pipe connects the liquid level H1 that makes the first cohesion still liquid level H2 less than the second cohesion still, according to the cross over pipe principle:
P1+H1＝P2+H2
Or P1-P2=H2-H1
The pressure reduction that is to say two stills is to come balance with the liquid level difference of two stills, and the pressure of two stills changes the liquid level variation that directly causes two stills in other words, makes operation be difficult to stablize.Cut down if an adjusting is installed on cross over pipe, the resistance Δ P that cuts down by adjusting comes the pressure of balance two stills to change:
P1+H1＝P2+H2+ΔP
Or P1-P2=H2-H1+ Δ P
If change cross over pipe into balance pipe, the liquid level of two stills has just all been stablized, and H3 is that balance pipe goes out the poor of the open height and the first cohesion still liquid level H1, and has following equilibrium relation:
P1+H1=P2+H1+H3 and H2 are irrelevant!
From following formula equal sign both sides cancellation H1:
P1=P2+H3 and H1 are irrelevant!
Or P1-P2=H3
The pressure reduction that is to say two stills is to come balance with balance pipe at the liquid level of logistics, and is irrelevant with the liquid level of two stills; Therefore, the pressure that changes cross over pipe into behind the balance pipe two stills changes can not influence two still liquid levels, and two still liquid levels are stable.
The present invention compared with prior art has novelty simple in structure, and is easy for operation, characteristics such as working stability, and can effectively improve steam stripping efficiency, save energy.
Description of drawings:
Fig. 1 is the polymer solution steam stripping flocculation device and the flowage structure principle schematic of three kinds of different syndetons in the technology that the present invention relates to; Wherein Fig. 1 a is the cross over pipe form, and Fig. 1 b is direct enter mode, and Fig. 1 c is for being equipped with the balance pipe form.
Fig. 2 is device of the present invention and flowage structure principle schematic thereof.
The specific embodiment:
Further specify below in conjunction with accompanying drawing and by embodiment.
Embodiment 1: a kind of steam stripping coacervation and separation device for polymer solution and flow process that balance pipe is installed, and shown in Fig. 1 c.
Present embodiment comprises the first cohesion still, 1, the second cohesion still 2, balance pipe 9; P1 is the first cohesion still pressure, and P2 is the second cohesion still pressure, and H1 is the first cohesion still liquid level, and H2 is the second cohesion still liquid level, and H3 is that balance pipe goes out the poor of open height and H1.
When present embodiment is implemented, temperature in the first cohesion still 1 is 95 ℃, the first cohesion still pressure P 1 is 0.03MPa (gauge pressure), the second cohesion still temperature is that 100 ℃ of second cohesion still pressure P 2 is 0.01MPa (gauge pressure), the first cohesion still liquid level H1 is 4 meters, and the second cohesion still liquid level H2 is 5 meters, and the height H 3 that the interior logistics of balance pipe exceeds the first cohesion still liquid level H1 is 2 meters, implementing under the operation usually, satisfactory for result.
Embodiment 2: a kind of steam stripping coacervation and separation device for polymer solution that balance pipe is installed, and shown in accompanying drawing 1c.
The first cohesion still temperature of present embodiment is 98 ℃, the first cohesion still pressure P 1 is 0.05MPa (gauge pressure), the second cohesion still temperature is that 102 ℃ of second cohesion still pressure P 2 is 0.01MPa (gauge pressure), the first cohesion still liquid level H1 is 4 meters, the second cohesion still liquid level H2 is 5 meters, the height H 3 that the interior logistics of balance pipe exceeds the first cohesion still liquid level H1 is 4 meters, and is implementing under the operation usually, satisfactory for result.
3. 1 kinds of steam stripping coacervation and separation device for polymer solution that balance pipe are installed and carry dense device of embodiment, as shown in Figure 2.
Present embodiment comprises the first cohesion still 1, the second cohesion still 2, carry dense device 3, polymer beads water is regulated and is cut down 4, polymer beads water pump 5, from the next circulating hot water pipeline 6 of post processing, polymer solution pipeline 7 heating steam pipelines 8 and 12, from the polymer beads water pipeline 9 that the first cohesion still comes out, carry dense water pipeline 10, carried the balance pipe 11 of dense polymer beads water, condense the gas pipeline 13 that still steams from first, steam gas pipeline 14 from the first cohesion still, remove the polymer beads water pipeline 15 of post processing, put forward the concentrated stream amount and regulate and to cut down 16 and carry concentrated stream amount meter 17.
Present embodiment comprises the first cohesion still 1 and the second cohesion still 2 that has double-deck agitator, be installed in the dense device 3 of carrying on the balance pipe, the polymer solution pipeline 7 that is installed in the first cohesion still 1 with the circulating hot water pipeline 6 that comes from post processing, is connected first and condenses still 1 rising gas pipeline 13, heating steam pipeline 8 and polymer beads water pipeline 9; The adjusting that is installed on the polymer beads water pipeline 9 cuts down 4; Cut down 16 and flowmeter 17 with carry dense water pipeline 10 and the Flow-rate adjustment of carrying that dense device 3 bottoms are connected.Carry the balance pipeline 11 of dense polymer beads water with the quilt of carrying dense device 3 tops and second cohesion still 2 tops; With the gas pipeline 14 that steams that second cohesion still 2 tops are connected, lower heating steam pipe line 12 with remove the polymer beads water pipeline 15 and the polymer beads water pump 5 of post processing.
Present embodiment is with rare-earth isoprene rubber glue 100 liters of 15% gelatin concentration/hour enter the first cohesion still 1 from pipeline 7, the circulating hot water that contains dispersant 500 liters that come from post processing/hour enter the first cohesion still 1 from pipeline 6 add the hot steam and enter the first cohesion still 1 from pipeline 8; The temperature of the first cohesion still 1 is 85 ℃, and pressure is 0.02MP (G), and the solvent and the steam that are steamed remove condensate recovery system from pipeline 13; Cut down 4 from the first polymer beads water that contains polymer 1% that comes out of cohesion still 1 from pipeline 9 by adjusting and enter and carry dense device 3, from carry dense device 3 bottoms extract out 330 liters/hour through overregulate cut down 16 and flowmeter 17 enter micelle water pump 5 after polymer beads water that still 2 comes out mixes with condensing from second; Being carried dense polymer beads water (concentration brings up to 6%) is 102 ℃ through the vapour phase that pipeline 11 enters the second cohesion still 2 in temperature from carrying dense device 3 tops, and pressure is to continue cohesion under 0.01MPa (gauge pressure) condition; The liquid level of two cohesion stills is all 1.2 meters stable operations; Add the hot steam and enter the second cohesion still from pipeline 12, the solvent and the steam that are steamed remove condensate recovery system from pipeline 14; Less than 0.1% (butt), go post processing from the solvent of second micelle that come out of cohesion still 2 through micelle pump 5 and pipeline 15; The liquid level of two cohesion stills is all 1.2 meters stable operations.
Claims (3)
1. balancing pipe type polymer solution steam stripping flocculation separator, it is characterized in that the polymer beads water that flows out from the first cohesion still liquid phase in the traditional double still cohesion flow process is entered the second cohesion still liquid phase connecting line changes the balance pipe type of attachment into by the type of attachment of original cross over pipe, the liquid phase of the first cohesion still is linked to each other with the vapour phase of the second cohesion still, promptly the polymer beads water that flows out from first liquid phase of condensing still directly enters the second top vapour phase of condensing still, the liquid level of two cohesion stills is not independently disturbed mutually, and the balance pipe between two stills exceeds the pressure reduction that first height that condenses the still liquid level is equal to or less than two stills; It is by the logistics height balance in the balance pipe that the first cohesion still still is pressed fluctuation, does not influence the liquid level of two stills; Outlet and each outlet are set at balance pipe differing heights place are shaped on respectively, keeping pressing the outlet of selecting differing heights according to its still under the constant prerequisite of the first cohesion still liquid level by cutting down; Cut down with the pressure of controlling the first cohesion still and the variation of liquid level in that an adjusting is installed from the first polymer beads water pipeline that come out of cohesion still, rely on the pressure reduction transferring polymer particle water of two stills.
2. balancing pipe type polymer solution steam stripping flocculation separator according to claim 1, it is characterized in that the first cohesion still and the second cohesion still have double-deck agitator, be equipped with on the balance pipe and carry dense device, polymer solution pipeline and the circulating hot water pipeline from post processing are installed on the first cohesion still, regulate to cut down being installed on the polymer beads water pipeline; Carry that dense water pipeline cuts down with Flow-rate adjustment and flowmeter with carry dense device 3 bottoms and be connected; The gas pipeline that steams is connected with the second cohesion still top, and the second cohesion still bottom is connected to the heating steam pipeline and removes the polymer beads water pipeline and the polymer beads water pump of post processing.
3. balancing pipe type polymer solution steam stripping flocculation separation method, it is characterized in that rare-earth isoprene rubber glue 100 liters of 15% gelatin concentration/hour enter the first cohesion still from pipeline, the circulating hot water that contains dispersant 500 liters that come from post processing/hour enter the first cohesion still from pipeline add the hot steam and enter the first cohesion still from pipeline; The temperature of the first cohesion still is 85 ℃, and pressure is 0.02MP (G), and the solvent and the steam that are steamed remove condensate recovery system from pipeline; Cut down to enter by adjusting from pipeline from the first polymer beads water that contains polymer 1% that comes out of cohesion still and carry dense device, extract 330 liters/hour enter the micelle water pump after polymer beads water that still comes out mixes with condensing out from second through overregulating to cut down with flowmeter from carrying dense device bottom; Being carried dense polymer beads water is 102 ℃ through the vapour phase that pipeline enters the second cohesion still in temperature from carrying dense device top, and pressure is to continue cohesion under 0.01MPa (gauge pressure) condition; The liquid level of two cohesion stills is all 1.2 meters stable operations; Add the hot steam and enter the second cohesion still from pipeline, the solvent and the steam that are steamed remove condensate recovery system from pipeline; Less than 0.1% (butt), go post processing from the solvent of second micelle that come out of cohesion still through micelle pump and pipeline; The liquid level of two cohesion stills is all 1.2 meters stable operations.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101381984A CN101314085A (en) | 2008-07-12 | 2008-07-12 | Balancing pipe type polymer solution steam stripping flocculation separation method and apparatus |
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| CNA2008101381984A CN101314085A (en) | 2008-07-12 | 2008-07-12 | Balancing pipe type polymer solution steam stripping flocculation separation method and apparatus |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102181002A (en) * | 2011-03-04 | 2011-09-14 | 中国石油天然气股份有限公司吉林石化分公司 | Wet coagulation method for rare-earth isoprene rubber |
| CN102382214A (en) * | 2011-08-31 | 2012-03-21 | 中国石油化工股份有限公司 | Coacervation technology for polymer product production |
-
2008
- 2008-07-12 CN CNA2008101381984A patent/CN101314085A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102181002A (en) * | 2011-03-04 | 2011-09-14 | 中国石油天然气股份有限公司吉林石化分公司 | Wet coagulation method for rare-earth isoprene rubber |
| CN102181002B (en) * | 2011-03-04 | 2012-11-14 | 中国石油天然气股份有限公司吉林石化分公司 | Wet coagulation method for rare-earth isoprene rubber |
| CN102382214A (en) * | 2011-08-31 | 2012-03-21 | 中国石油化工股份有限公司 | Coacervation technology for polymer product production |
| CN102382214B (en) * | 2011-08-31 | 2013-04-03 | 中国石油化工股份有限公司 | Coacervation technology for polymer product production |
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Open date: 20081203 |