CN2526320Y - Device for jetting and returning vinyl chloride mass polymerization condensed fluid - Google Patents

Abstract

The utility model relates to a device for jetting and returning vinyl chloride mass polymerization condensed fluid. The utility model adopts a kettle body interlayer cover and the inside puts through the cold waters and an upper beater as well as a lower beater to beat up, in particular adopts an upper beater which is provided with water through interlayer covering laminas and a condensator to exchanging heat. The defects of the utility model are that: the structure of the upper beater is complex, the mechanical requirements are high, the manufacturing and production are difficult, the cost is high, the heat efficiency of the used devices are low, the temperature of each position in the kettle is difficult to be controlled and the quality of the products are influenced. The utility model can satisfactorily solve the problems, the utility model consists of injecting cylinders, a connecting reflecting kettles and each pipeline between the injecting cylinders and comprises a condensate imputing pipe which the condenser to the injecting cylinder, a pressurizing condensate outputting pipe which the injecting cylinder to the reflecting kettle, a gas outputting pipe which a high pressure nitrogen gas and the imputing pipe of the injecting cylinder to a low pressure nitrogen gas groove. The utility model is characterized in that: the injecting cylinder is a cylinder-shaped airproofed container, the top of the shell body is provided with a high pressure nitrogen gas inlet, a low pressure nitrogen gas discharging outlet, a chloroethylene condensate inlet, a pressurizing chloroethylene condensate outputting outlet and a floating cup which is arranged in the cylinder and can float up-down. The utility model has the advantages of simple structure, accurate control, high heat exchanging efficiency, even and stable temperature in the kettle, safe and reliable operation and low cost, etc.

Description

Bulk polymerization of VC phlegma spray back device

Technical field

The utility model relates to a kind of heat conducting device of bulk polymerization of VC reactor, definitely say so to relate to and a kind ofly can derive the bulk polymerization of VC heat of reaction, make the bulk polymerization of VC reaction, can obtain a kind of heat conducting device of balancing control, particularly a kind of phlegma spray back device.

Background technology

Existing bulk polymerization of VC reactor is by reacting kettle jacketing, condenser and be contained in the endoceliac agitator up and down of shell, derives the heat of polymerization that polyreaction produces by upper and lower stirring.; by agitator thereon is the spiral stirrer that a kind of blade has interlayer cover, interior logical water coolant structure; its technical feature requires height, the processing and manufacturing difficulty is big, cost is high; cool off the heat of polymerization that polyreaction produces with this agitator; often the heat conduction efficiency by himself lower, be difficult to the polymeric reaction temperature in the controlled polymerization reactor; and the inequality that temperature in the kettle distributes can cause the quality of product, performance difference bigger again.

Summary of the invention

Goal of the invention of the present utility model is: overcome in the existing polymerization reaction kettle, conduct in the device fabrication that heat of polymerization produced and the difficulty in the control by chuck water flowing agitator.For enterprise provides that a kind of heat transfer equipment is simple in structure, easy to manufacture, cost is low, heat transfer efficiency is high, in the control still polymeric reaction temperature be evenly distributed, the bulk polymerization of VC phlegma spray back device of stable reaction.

Goal of the invention of the present utility model realizes by implementing following technical proposals: a kind of bulk polymerization of VC phlegma spray back device, include the vinylchlorid phlegma output tube that is connected by with condenser on the polymerization reaction kettle, the pressurization vinylchlorid phlegma output tube that is connected with splash head on being contained in the polymerization reaction kettle cavity wall, the high pressure nitrogen input tube, the low-pressure nitrogen vent pipe, and the assemblies such as phlegma injection tube that are connected with these pipelines by valve constitute, it is characterized in that: the phlegma injection tube is a vertically cartridge type encloses container of device, and the high pressure nitrogen inlet by valve control is arranged at its top, side wall upper part has the low-pressure nitrogen relief outlet by valve control, lower sidewall has the vinylchlorid phlegma inlet by valve control, pressurization vinylchlorid phlegma delivery port by valve control is arranged at the bottom, and be contained in the phlegma injection tube cavity, opening up, with the driving fit of tube inner side-wall, can be on the tube inwall under phlegma of importing or high pressure nitrogen effect, the floating cup that moves down.Additional technical feature is: 1. in the upper side wall and the lower wall of phlegma injection tube a fluid level controller is installed respectively, to limit the bound position of liquid level in the tube, wherein the upper limit position of liquid level should be lower than the low-pressure nitrogen relief outlet.2. from the valve on the phlegma output tube of condenser, with the valve of control injection tube high pressure nitrogen inlet, for one closing an interstage valve that closes simultaneously; The valve of control injection tube low-pressure nitrogen relief outlet, the valve of the pressurization vinylchlorid phlegma delivery port bottom the control injection tube is for one closing an interstage valve that closes simultaneously; Be that valve on the phlegma output tube and the valve on the low-pressure nitrogen relief outlet are opened simultaneously or closed, the valve on the high pressure nitrogen inlet is opened simultaneously or is closed with the valve on the pressurization vinylchlorid phlegma delivery port.

Advantage of the present utility model is: 1. owing to changed the last spiral stirrer with the logical water coolant of interlayer cover, overlap spiral stirrer for it common no interlayer, thereby reduced the difficulty of processing of equipment, reduced cost; 2. in polymerization reaction kettle middle part, bottom or bottom, pressurization phlegma splash head by the control of vinylchlorid phlegma spray back device has been installed, can spray into the vinylchlorid phlegma discontinuously by pulsed, by the gasification of vinylchlorid phlegma, take away the heat of polymerization that polyreaction produces again, keep the thermal equilibrium of polymerization reaction system, thereby simplified the requirement of bulk polymerization of VC reaction pair polymerization reaction kettle greatly, make in the polymerization reaction system, polymerization temperature is even, and the model of product is stable; 3. this jet apparatus has outstanding advantages such as simple in structure, that precise control is easy, operational safety is reliable, cost of manufacture is low, is convenient to apply on existing apparatus.

Description of drawings Fig. 1 be the utility model structure principle chart Fig. 2 for the utility model in the bulk PVC two-step process the position and phlegma spray technology synoptic diagram figure in mark: 1 is the phlegma injection tube, 2 are floating cup, 3 are the high pressure nitrogen inlet, 4 are the low-pressure nitrogen outlet, 5 are pressurization vinylchlorid condensate outlet, 6 are vinylchlorid phlegma inlet, 7,8,9,10 is by-pass valve control, 11,12 is fluid level controller, 13 is the high pressure nitrogen input tube, and 14 is the low-pressure nitrogen vent pipe, 15,16,18,19 are pressurization vinylchlorid phlegma output tube, 17 is vinylchlorid phlegma input tube, 20,21,22,23 are pressurization vinylchlorid phlegma splash head, and 24 is polymerization reaction kettle, and 25 is strainer, 26 is condenser, 27 are following agitator, and 28 are spiral stirrer on the no chuck, and 29 is prepolymerization reactor, 30 is the prepolymerization reactor discharge opening, and 31 is the prepolymerization reactor condenser.

Embodiment

17 tons of vinylchlorid and 4/10000ths initiator is added prepolymerization reactor 29, with 80 ℃ of hot water interlayers material is heated to 68 ℃, pressure is 12kg/cm ², reaction times 10-17 minute, through pipeline material is entered polymeric kettle 24 by discharge opening 30 then; Added the initiator of 15 tons of vinyl chloride monomers and 4/10000ths ratios in advance in polymerization reaction kettle 24, mixed common 32-34 ton mutually with the seed slurry that prepolymerization reactor enters, it is 7.8-12.6kg/cm that agitator is stirred and heated to pressure ², reaction heat is by polymerization reaction kettle chuck water coolant, and agitator 28,27 stirs up and down, and phlegma spray back device injected cool lime set in the reactor chamber is carried out heat exchange.When heat exchange begins, condenser 26 on the reactor, the vinylchlorid phlegma is passed through input tube 17, valve 7, enter in the phlegma injection tube 1 by the inlet on the injection tube 6, the phlegma liquid level is risen, promoting floating cup 2 moves up, under the promotion of floating cup, make the nitrogen on the floating cup of injection tube top, discharge by low-pressure nitrogen outlet 4, enter the low-pressure nitrogen storage tank through low-pressure nitrogen vent pipe 14, when vinylchlorid condensation liquid level rises to upper limit position, valve 9 and 7 is closed simultaneously, valve 8 and 10 is opened simultaneously, high pressure nitrogen is along input tube 13, through valve 8, high pressure nitrogen inlet 3 on the injection tube enters injection tube, promoting floating cup 2 moves down; floating cup vinylchlorid phlegma down is by floating cup pressurization, by the outlet 5 of injection tube bottom, along pipeline 15; 16; 18; 19; by connected splash head 20 respectively; 21; 22; 23 spray the vinylchlorid phlegma to polymerization reaction kettle 24 in; make the temperature uniform distribution in the reactor, and when the floating cup 2 of phlegma injection tube was depressed into the lower position with phlegma, valve 9 and 7 was opened again; while valve 8 and 10 is closed, and the high pressure nitrogen that floats glass 2 tops enters the low-pressure nitrogen storage tank through relief outlet 4 and pipeline 14; The inlet 6 of the vinylchlorid phlegma of drawing by condenser 26 this moment on valve 7, injection tube, enter injection tube again, promote floating cup come-up, move to the upper limit up to floating cup; Then, valve 7,9 is closed, and 8,10 open, high pressure nitrogen is exerted pressure through the floating cup of valve 8 in injection tube, pressurization vinylchlorid phlegma in the injection tube sprays into reactor 24 again through each pipeline by splash head 20,21,22,23, has so just finished pulsatile once and has injected the cycle.The phlegma that injects, homodisperse, gasification, heat absorption reach the purpose of taking away reaction heat under stirring action.This injection process carries out repeatedly, makes polymerization temperature and pressure held stationary in the polymerization process.After reaction was carried out 180 minutes, this moment, reaction pressure descended, and stopped to inject phlegma, opened the variable valve of strainer 25, allowed the interior vinylchlorid liquid of reactor gasify, and entered condenser, entered the vinyl chloride monomer storage tank after the liquefaction; Afterreaction still 24 interior pressure were reduced to 3kg/cm in 1 hour ², begin to enter the vinylchlorid gas holder; When the still internal pressure drops to 1kg/cm ²When following, with vacuum pump suction gas holder, when vacuum tightness reaches-0.88kg/cm ²The time, use steam stripped, remove the residual chlorine vinyl monomer in the product, make it content and be lower than below the 5PPM, discharging to sub-sieve, pack, must the polyvinyl chloride finished product.

Claims (3)

1, a kind of bulk polymerization of VC phlegma spray back device, include the vinylchlorid phlegma output tube (17) that is connected by with condenser (26) on the polymerization reaction kettle (24), the pressurization vinylchlorid phlegma output tube (15) (16) (18) (19) that is connected with splash head on being contained in polymerization reaction kettle (24) cavity wall, high pressure nitrogen input tube (13), low-pressure nitrogen vent pipe (14), and the phlegma injection tube assemblies such as (1) that is connected with these pipelines by valve constitutes, it is characterized in that: phlegma injection tube (1) is a vertically cartridge type encloses container of device, and the high pressure nitrogen inlet (3) by valve (8) control is arranged at its top, side wall upper part has the low-pressure nitrogen relief outlet (4) by valve (9) control, lower sidewall has the vinylchlorid phlegma inlet (6) by valve (7) control, pressurization vinylchlorid phlegma delivery port (5) by valve (10) control is arranged at the bottom, and be contained in phlegma injection tube (1) cavity, opening up, with the driving fit of tube inner side-wall, can be on the tube inwall under phlegma of importing or high pressure nitrogen effect, the floating cup (2) that moves down.

2, according to the described bulk polymerization of VC phlegma of claim 1 spray back device, it is characterized in that: upper side wall and lower wall at phlegma injection tube (1) are respectively installed a fluid level controller (11) and (12), to limit the upper and lower limit position of tube (1) interior liquid level, wherein the upper limit position of liquid level should be lower than low-pressure nitrogen relief outlet (4).

3, according to the described bulk polymerization of VC phlegma of claim 1 spray back device, it is characterized in that: from the valve (7) on the phlegma output tube (17) of condenser (26), with the valve (8) of control injection tube high pressure nitrogen inlet (3), for one closing an interstage valve that closes simultaneously; The valve (9) of control injection tube low-pressure nitrogen relief outlet (4), the valve (10) of the pressurization vinylchlorid phlegma delivery port bottom the control injection tube is for one closing an interstage valve that closes simultaneously; Be that valve (7) is opened simultaneously or closed with (9), valve (8) is opened simultaneously or is closed with valve (10).

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