CN103497313B - polylactic acid production system - Google Patents
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- CN103497313B CN103497313B CN201310467826.4A CN201310467826A CN103497313B CN 103497313 B CN103497313 B CN 103497313B CN 201310467826 A CN201310467826 A CN 201310467826A CN 103497313 B CN103497313 B CN 103497313B
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Abstract
The invention discloses Polylactic acid production system, comprise mixed reactor and preheating Devolatilization device, connected by middle mixing section between described mixed reactor and preheating Devolatilization device, described mixed reactor comprises feed jet mixing section, circulation section group and polymerization reaction zone group, described feed jet mixing section connects circulation section group, is connected between described circulation section group and polymerization reaction zone group by fresh feed pump; Described preheating Devolatilization device comprises devolatilization preheater section and devolatilizer part.The invention has the beneficial effects as follows: continuous seepage, easily control in process, the heat transfer area that unit equipment volume energy provides is large, the overall coefficient of heat transfer of equipment is high, uniformity of temperature profile, improves the quality of product, decrease maintenance load, energy consumption is low, easily internals can be split out and clear up, to change product category, material more easily flows downward, and not easily material stock, fluid in the viscous flow internal layer reduced thickness at nearly tube wall place, thus reduces the resistance of heat transfer.
Description
Technical field
The present invention relates to a kind of Polylactic acid production system.
Background technology
Poly(lactic acid) is that main raw material is polymerized the polymkeric substance obtained with lactic acid, and raw material sources are abundant and can regenerate.The production process of poly(lactic acid) is pollution-free, and product can biological degradation, and realizing the circulation at occurring in nature, is therefore desirable Green Polymer Material.Poly(lactic acid) of the prior art can not realize continuous seepage when hybrid reaction, be not easy in polymerization process to control, the heat transfer area that unit equipment volume energy provides is little, and the overall coefficient of heat transfer of equipment is low, and in reactor, same section temperature distributing disproportionation is even, thus have impact on the quality of product, be provided with moving parts, maintenance load increases, and energy consumption is high, and internals split out inconvenience, product category is changed in impact; When preheating devolatilization, the volume of flat cover cone end socket is excessive, and material flows downward slowly, easy material stock, and the viscous flow internal layer thickness of fluid at nearly tube wall place is large, adds the resistance of heat transfer, reduces working efficiency.
Therefore, the technology being badly in need of a kind of improvement solves this problem existing in prior art.
Summary of the invention
The invention provides a kind of Polylactic acid production system.
The technical solution used in the present invention is:
Polylactic acid production system, is comprised mixed reactor and preheating Devolatilization device, is connected between described mixed reactor and preheating Devolatilization device by middle mixing section,
Described mixed reactor comprises feed jet mixing section, circulation section group and polymerization reaction zone group, and described feed jet mixing section connects circulation section group, is connected between described circulation section group and polymerization reaction zone group by fresh feed pump,
Described feed jet mixing section comprises feed jet mixing section cylindrical shell, described feed jet mixing section inner barrel is provided with mixed cell I, described feed jet mixing section cylindrical shell one end is provided with material inlet, the other end connects circulation section group, feed jet mixing section cylindrical shell chuck is arranged with outside described feed jet mixing section cylindrical shell, described feed jet mixing section cylindrical shell chuck is provided with chuck heat conductive oil inlet away from material inlet bottom portion, is provided with the outlet of chuck thermal oil near material inlet end top
Described circulation section group comprises mixing section I, mixing section II, mixing section III, conversion zone and recycle pump, described mixing section I, mixing section II, mixing section III, conversion zone and recycle pump are by elbow I, elbow II, elbow III and threeway form ring-type, and described elbow I is located between mixing section II and mixing section III, and described elbow II is located between mixing section III and conversion zone, and described threeway is ligation section respectively, recycle pump and fresh feed pump, described elbow III is located between recycle pump and mixing section I, described mixing section II is located at mixing section I top, described mixing section I comprises mixing section cylindrical shell I, described mixing section cylindrical shell I inside is provided with mixed cell II, described mixing section II comprises mixing section cylindrical shell II, described mixing section cylindrical shell II inside is provided with mixed cell III, described mixing section III comprises mixing section cylindrical shell III, described mixing section cylindrical shell III inside is provided with mixed cell IV, described conversion zone comprises conversion zone cylindrical shell, and described conversion zone inner barrel is provided with hybrid reaction unit I, described mixing section cylindrical shell I, mixing section cylindrical shell II, mixing section cylindrical shell III, conversion zone cylindrical shell, elbow I, elbow II, elbow III and threeway periphery are respectively equipped with mixing section jacket cylinder I, mixing section jacket cylinder II, mixing section jacket cylinder III, conversion zone jacket cylinder, elbow chuck I, elbow chuck II, elbow chuck III and threeway chuck, described mixing section jacket cylinder I, conversion zone jacket cylinder, be equipped with chuck heat conductive oil inlet bottom elbow chuck III and threeway chuck, top is equipped with the outlet of chuck thermal oil, described mixing section jacket cylinder II, elbow chuck I, mixing section jacket cylinder III, elbow chuck II communicates, and is provided with chuck heat conductive oil inlet bottom described mixing section jacket cylinder II, is provided with the outlet of chuck thermal oil bottom described elbow chuck II,
Described polymerization reaction zone group is formed by stacking by multiple polymerization reaction zone, described polymerization reaction zone comprises polymerization reaction zone cylindrical shell, described polymerization reaction zone inner barrel is provided with hybrid reaction unit II, polymerization reaction zone cylindrical shell chuck is arranged with outside described polymerization reaction zone cylindrical shell, bottom described polymerization reaction zone cylindrical shell chuck, side is provided with chuck heat conductive oil inlet, top opposite side is provided with the outlet of chuck thermal oil, polymerization reaction zone cylindrical shell top described in top connects middle mixing section, polymerization reaction zone cylinder body bottom described in bottommost is connected with fresh feed pump by elbow IV, elbow chuck IV is arranged with outside described elbow IV, chuck heat conductive oil inlet is provided with bottom described elbow chuck IV, top is provided with the outlet of chuck thermal oil, described elbow chuck IV top, chuck heat conductive oil inlet and the outlet of chuck thermal oil is all arranged with bottom polymerization reaction zone cylindrical shell chuck top and polymerization reaction zone cylindrical shell chuck,
Described mixed cell I, mixed cell III and mixed cell IV are arranged by left-turn spiral sheet and right-hand(ed)screw sheet interval and form, the horizontal stripe that described mixed cell II is 30 ° by several and axle is welded, described hybrid reaction unit I and hybrid reaction unit II are by the bending tubule of Chinese knot-type shape, described tubule two ends connect inner coil pipe heat conductive oil inlet and the outlet of inner coil pipe thermal oil, and described inner coil pipe heat conductive oil inlet and the outlet of inner coil pipe thermal oil are located at inner coil pipe thermal oil and are imported and exported on cavity;
Described preheating Devolatilization device comprises devolatilization preheater section and devolatilizer part, and described devolatilization preheater section is located at devolatilizer atop part,
Described devolatilization preheater section comprises shell-side cylinder, described shell-side cylinder top is respectively equipped with shell side drain and the outlet of shell side thermal oil, bottom is respectively equipped with shell side heat conductive oil inlet and shell side discharging hole, described shell-side cylinder top is provided with upper tubesheet, bottom is provided with lower tubesheet, between described upper tubesheet and lower tubesheet, central position is provided with interchanger, described interchanger is built with high efficient heat exchanging element, described high efficient heat exchanging element arranges by left-turn spiral sheet and right-hand(ed)screw sheet interval the horizontal stripe formed or be 30 ° by several and axle and is welded, described shell-side cylinder inside is interval with baffle plate I and baffle plate II, described baffle plate I one end is fixed by controlled interval pull rod I, gap is had in vain between the other end and shell-side cylinder inwall, described baffle plate II one end is fixed by controlled interval pull rod II, gap is had in vain between the other end and shell-side cylinder inwall, described controlled interval pull rod I and controlled interval pull rod II top are fixed on upper tubesheet, described upper tubesheet top is provided with flat cover cone end socket, described flat cover cone end socket top connects middle mixing section, jacket head is arranged with outside described flat cover cone end socket, both sides, described end socket chuck top are respectively equipped with chuck heat conductive oil inlet and the outlet of chuck thermal oil, side, described jacket head top is provided with the outlet of chuck thermal oil, bottom opposite side is provided with chuck heat conductive oil inlet,
Described devolatilizer part comprises devolatilizer inner barrel, side, described devolatilizer cylindrical shell top is provided with vacuum orifice, described devolatilizer inner barrel top is provided with devolatilizer upper cover, bottom is provided with devolatilizer lower cone, devolatilizer cylindrical shell chuck is arranged with outside described devolatilizer inner barrel, devolatilizer lower cone chuck is arranged with outside described devolatilizer lower cone, described devolatilizer cylindrical shell chuck and devolatilizer lower cone chuck communicate, bottom described devolatilizer lower cone chuck, side is provided with chuck heat conductive oil inlet, side, described devolatilizer cylindrical shell chuck top is provided with the outlet of chuck thermal oil, poly(lactic acid) outlet is connected bottom described devolatilizer lower cone,
Described middle mixing section comprises the elbow V connected successively, middle mixing section cylindrical shell and elbow VI, described elbow V bottom end connects polymerization reaction zone cylindrical shell, described elbow VI bottom end connects flat cover cone end socket, described elbow V is provided with charge of intermediation mouth, mixed cell V is provided with in described middle mixing section cylindrical shell, elbow chuck V is arranged with outside described elbow V, elbow chuck VI is arranged with outside described elbow VI, middle mixing section cylindrical shell chuck is arranged with outside described middle mixing section cylindrical shell, described elbow chuck V, bottom middle mixing section cylindrical shell chuck and elbow chuck VI, side is provided with chuck heat conductive oil inlet, side, top is provided with the outlet of chuck thermal oil, described elbow chuck V, middle mixing section cylindrical shell chuck and elbow chuck VI end are all arranged with chuck heat conductive oil inlet and the outlet of chuck thermal oil.
Described elbow I, elbow II, elbow III, elbow IV, elbow V and elbow VI are 90 ° of elbows.
Described elbow II, elbow III, elbow IV, elbow VI and threeway are provided with temperature pressure sensing joint.
Be provided with sloper between described threeway and fresh feed pump, be arranged with sloper chuck outside described sloper, described sloper chuck and threeway chuck communicate.
Flow deflector is provided with in described devolatilizer cylindrical shell chuck.
Side, described devolatilizer cylindrical shell top is provided with band lamp visor.
Described devolatilizer cylindrical shell jackets outer wall is fixed with equipment ear seat.
The angular range of the apex angle α of described flat cover cone end socket is 140 °-160 °.
Described upper tubesheet is evenly provided with stream pipe, described stream pipe top is provided with the thrust-augmenting nozzle of inverted isosceles trapezoid shape, fits tightly between described thrust-augmenting nozzle.
The invention has the beneficial effects as follows: during hybrid reaction, can continuous seepage be realized, easily control in polymerization process, the heat transfer area that unit equipment volume energy provides is large, and the overall coefficient of heat transfer of equipment is high, same section uniformity of temperature profile in reactor, thus improve the quality of product, do not have moving parts, decrease maintenance load, energy consumption is low, easily internals can be split out and clear up, to change product category; During preheating devolatilization, the volume of flat cover cone end socket is little, and material more easily flows downward, and not easily material stock, fluid in the viscous flow internal layer reduced thickness at nearly tube wall place, thus reduces the resistance of heat transfer, increases work efficiency.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Fig. 1 is structural representation of the present invention.
Fig. 2 is the structural representation of mixed reactor of the present invention.
Fig. 3 is the structural representation of mixed cell I in Fig. 2 of the present invention, mixed cell III and mixed cell IV.
Fig. 4 is the structural representation of mixed cell II in Fig. 2 of the present invention.
Fig. 5 is the structural representation of hybrid reaction unit I and hybrid reaction unit II in Fig. 2 of the present invention.
Fig. 6 is the structural representation of preheating Devolatilization device of the present invention.
Fig. 7 is the structural representation of upper tubesheet in Fig. 6 of the present invention.
Fig. 8 is the structural representation of high efficient heat exchanging element in Fig. 6 of the present invention.
Fig. 9 is the structural representation of middle mixing section of the present invention.
Wherein: 1, feed jet mixing section cylindrical shell, 2, mixed cell I, 3, material inlet, 4, feed jet mixing section cylindrical shell chuck, 5, chuck heat conductive oil inlet, 6, chuck thermal oil exports, and 7, recycle pump, 8, elbow I, 9, elbow II, 10, elbow III, 11, threeway, 12, fresh feed pump, 13, mixing section cylindrical shell I, 14, mixing section cylindrical shell II, 15, mixing section cylindrical shell III, 16, conversion zone cylindrical shell, 17, mixing section jacket cylinder I, 18, mixing section jacket cylinder II, 19, mixing section jacket cylinder III, 20, conversion zone jacket cylinder, 21, elbow chuck I, 22, elbow chuck II, 23, elbow chuck III, 24, threeway chuck, 25, mixed cell II, 26, mixed cell III, 27, mixed cell IV, 28, hybrid reaction unit I, 29, polymerization reaction zone cylindrical shell, 30, hybrid reaction unit II, 31, polymerization reaction zone cylindrical shell chuck, 32, middle mixing section cylindrical shell, 33, elbow IV, 34, elbow chuck IV, 35, temperature pressure sensing joint, 36, sloper, 37, sloper chuck, 38, inner coil pipe heat conductive oil inlet, 39, inner coil pipe thermal oil exports, and 40, inner coil pipe thermal oil imports and exports cavity, and 41, shell-side cylinder, 42, shell side drain, 43, shell side thermal oil exports, and 44, shell side heat conductive oil inlet, 45, shell side discharging hole, 46, upper tubesheet, 47, lower tubesheet, 48, interchanger, 49, baffle plate I, 50, baffle plate II, 51, controlled interval pull rod I, 52, gap, 53, controlled interval pull rod II, 54, flat cover cone end socket, 55, charge of intermediation mouth, 56, jacket head, 57, elbow V, 58, elbow VI, 59, devolatilizer inner barrel, 60, vacuum orifice, 61, devolatilizer upper cover, 62, devolatilizer lower cone, 63, devolatilizer cylindrical shell chuck, 64, devolatilizer lower cone chuck, 65, poly(lactic acid) exports, and 66, flow deflector, 67, band lamp visor, 68, equipment ear seat, 69, apex angle α, 70, stream pipe, 71, thrust-augmenting nozzle, 72, mixed cell V, 73, elbow chuck V, 74, elbow chuck VI, 75, middle mixing section cylindrical shell chuck, 76, left-turn spiral sheet and, 77, right-hand(ed)screw sheet, 78, axle, 79, horizontal stripe, 80, tubule.
Embodiment
In order to deepen the understanding of the present invention, be described in further detail of the present invention below in conjunction with embodiment and accompanying drawing, this embodiment, only for explaining the present invention, does not form the restriction to protection scope of the present invention.
As shown in figs 1-9, Polylactic acid production system of the present invention, is comprised mixed reactor and preheating Devolatilization device, is connected between described mixed reactor and preheating Devolatilization device by middle mixing section,
Described mixed reactor comprises feed jet mixing section, circulation section group and polymerization reaction zone group, described feed jet mixing section connects circulation section group, connected by fresh feed pump 12 between described circulation section group and polymerization reaction zone group, described feed jet mixing section comprises feed jet mixing section cylindrical shell 1, described feed jet mixing section cylindrical shell 1 inside is provided with mixed cell I 2, described feed jet mixing section cylindrical shell 1 one end is provided with material inlet 3, the other end connects circulation section group, feed jet mixing section cylindrical shell chuck 4 is arranged with outside described feed jet mixing section cylindrical shell 1, described feed jet mixing section cylindrical shell chuck 4 is provided with chuck heat conductive oil inlet 5 away from material inlet 3 bottom portion, chuck thermal oil outlet 6 is provided with near material inlet 3 end top, described circulation section group comprises mixing section I, mixing section II, mixing section III, conversion zone and recycle pump 7, described mixing section I, mixing section II, mixing section III, conversion zone and recycle pump 7 are by elbow I 8, elbow II 9, elbow III 10 and threeway 11 form ring-type, described elbow I 8 is located between mixing section II and mixing section III, described elbow II 9 is located between mixing section III and conversion zone, described threeway 11 is ligation section respectively, recycle pump 7 and fresh feed pump 12, described elbow III 10 is located between recycle pump 7 and mixing section I, described mixing section II is located at mixing section I top, described mixing section I comprises mixing section cylindrical shell I 13, described mixing section cylindrical shell I 13 inside is provided with mixed cell II 25, described mixing section II comprises mixing section cylindrical shell II 14, described mixing section cylindrical shell II 14 inside is provided with mixed cell III 26, described mixing section III comprises mixing section cylindrical shell III 15, described mixing section cylindrical shell III 15 inside is provided with mixed cell IV 27, described conversion zone comprises conversion zone cylindrical shell 16, described conversion zone cylindrical shell 16 inside is provided with hybrid reaction unit I 28, described mixing section cylindrical shell I 13, mixing section cylindrical shell II 14, mixing section cylindrical shell III 15, conversion zone cylindrical shell 16, elbow I 8, elbow II 9, elbow III 10 and threeway 11 periphery are respectively equipped with mixing section jacket cylinder I 17, mixing section jacket cylinder II 18, mixing section jacket cylinder III 19, conversion zone jacket cylinder 20, elbow chuck I 21, elbow chuck II 22, elbow chuck III 23 and threeway chuck 24, described mixing section jacket cylinder I 17, conversion zone jacket cylinder 20, chuck heat conductive oil inlet 5 is equipped with bottom elbow chuck III 23 and threeway chuck 24, top is equipped with chuck thermal oil outlet 6, described mixing section jacket cylinder II 14, elbow chuck I 21, mixing section jacket cylinder III 19, elbow chuck II 22 communicates, chuck heat conductive oil inlet 5 is provided with bottom described mixing section jacket cylinder II 14, chuck thermal oil outlet 6 is provided with bottom described elbow chuck II 22, sloper 36 is provided with between described threeway 11 and fresh feed pump 12, sloper chuck 37 is arranged with outside described sloper 36, described sloper chuck 37 and threeway chuck 24 communicate, described polymerization reaction zone group is formed by stacking by multiple polymerization reaction zone, described polymerization reaction zone comprises polymerization reaction zone cylindrical shell 29, described polymerization reaction zone cylindrical shell 29 inside is provided with hybrid reaction unit II 30, polymerization reaction zone cylindrical shell chuck 31 is arranged with outside described polymerization reaction zone cylindrical shell 29, bottom described polymerization reaction zone cylindrical shell chuck 31, side is provided with chuck heat conductive oil inlet 5, top opposite side is provided with chuck thermal oil outlet 6, polymerization reaction zone cylindrical shell 29 top described in top connects middle mixing section, be connected with fresh feed pump 12 by elbow IV 33 bottom polymerization reaction zone cylindrical shell 29 described in bottommost, elbow chuck IV 34 is arranged with outside described elbow IV 33, chuck heat conductive oil inlet 5 is provided with bottom described elbow chuck IV 34, top is provided with chuck thermal oil outlet 6, described elbow chuck IV 34 top, chuck heat conductive oil inlet 5 and chuck thermal oil outlet 6 is all arranged with bottom polymerization reaction zone cylindrical shell chuck 31 top and polymerization reaction zone cylindrical shell chuck 31, described elbow I 8, elbow II 9, elbow III 10, elbow IV 33 is 90 ° of elbows, described elbow II 9, elbow III 10, elbow IV 33 and threeway 11 are provided with temperature pressure sensing joint 35, described mixed cell I 2, mixed cell III 26 and mixed cell IV 27 are arranged by left-turn spiral sheet 76 and right-hand(ed)screw sheet 77 interval and form, the horizontal stripe 79 that described mixed cell II 25 is 30 ° by several and axle 78 is welded, there is sometimes left-handed sometimes dextrorotation in fluid under their restriction, outside by tube hub, again from the motion that tube wall is inside.This motion makes fluid in the viscous flow internal layer reduced thickness at nearly tube wall place, thus reduce the resistance of heat transfer, described hybrid reaction unit I 28 and hybrid reaction unit II 30 are press the bending tubule 45 of Chinese knot-type shape, described tubule 80 two ends connect inner coil pipe heat conductive oil inlet 38 and inner coil pipe thermal oil outlet 39, described inner coil pipe heat conductive oil inlet 38 and inner coil pipe thermal oil outlet 39 are located at inner coil pipe thermal oil and are imported and exported on cavity 40, with chuck outside a few joint polymerization reaction zone below, heat needed for polyreaction can be provided, polyreaction intersegmental part is equipped with many sinuate tubules 80, these tubules 80 bend according to certain rules, shape picture " Chinese knot ".Logical heating medium in tubule 80, these sinuate tubules 80 force fluid to make cross flow in pipeline, the cross flow of fluid can make the temperature of same section fluid become even on the one hand, also heat transfer coefficient can be improved on the other hand, continuous seepage can be realized, easily control in polymerization process, the heat transfer area that unit equipment volume energy provides is large, the overall coefficient of heat transfer of equipment is high, same section uniformity of temperature profile in reactor, thus improve the quality of product, there is no moving parts, decrease maintenance load, energy consumption is low, easily internals can be split out and clear up, to change product category.
Be in series by the mixing section of multiple band insulation jacket and conversion zone before of the present invention, by recycle pump 7 allow material constantly circulate in these mixing sections and conversion zone mixing, reaction formed circulation, when squeezed into by fresh feed pump 12 after material reaches certain viscosity and temperature below a few joint band insulation jacket polymerization reaction zone in.
Mixing section is above built with static mixer at pipeline, material can disperse/mix by these mixed cells well, outside pipeline, jacketed leads to heating medium can provide heat needed for mixing of materials, by tubule, shape is bending according to certain rules forms in conversion zone, logical heating medium in tubule, it can provide very large specific volume heat transfer area simultaneously so namely the effect of mixing.
Described preheating Devolatilization device comprises devolatilization preheater section and devolatilizer part, described devolatilization preheater section is located at devolatilizer atop part, described devolatilization preheater section comprises shell-side cylinder 41, described shell-side cylinder 41 top is respectively equipped with shell side drain 42 and shell side thermal oil outlet 43, bottom is respectively equipped with shell side heat conductive oil inlet 44 and shell side discharging hole 45, described shell-side cylinder 41 top is provided with upper tubesheet 46, bottom is provided with lower tubesheet 47, described upper tubesheet 46 is evenly provided with stream pipe 70, described stream pipe 70 top is provided with the thrust-augmenting nozzle 71 of inverted isosceles trapezoid shape, fit tightly between described thrust-augmenting nozzle 71, material can be made so more easily to flow downward, and not easily material stock, between described upper tubesheet 46 and lower tubesheet 47, central position is provided with interchanger 48, described interchanger 48 is built with high efficient heat exchanging element, described high efficient heat exchanging element is arranged by left-turn spiral sheet and right-hand(ed)screw sheet interval and forms (in Fig. 8 a) or the horizontal stripe being 30 ° by several and axle be welded (in Fig. 8 b), there is sometimes left-handed sometimes dextrorotation in fluid under their restriction, outside by tube hub, again from the motion that tube wall is inside.This motion makes fluid in the viscous flow internal layer reduced thickness at nearly tube wall place, thus reduce the resistance of heat transfer, , described shell-side cylinder 41 inside of increasing work efficiency is interval with baffle plate I 49 and baffle plate II 50, described baffle plate I 49 one end is fixed by controlled interval pull rod I 51, gap 52 is had in vain between the other end and shell-side cylinder 41 inwall, described baffle plate II 50 one end is fixed by controlled interval pull rod II 53, gap 52 is had in vain between the other end and shell-side cylinder 41 inwall, described controlled interval pull rod I 51 and controlled interval pull rod II 53 top are fixed on upper tubesheet 46, described upper tubesheet 46 top is provided with flat cover cone end socket 54, the angle of the apex angle α 69 of described flat cover cone end socket 54 is 150 °, the volume of flat cover cone end socket 54 can be made so little, described flat cover cone end socket 54 top connects middle mixing section, jacket head 56 is arranged with outside described flat cover cone end socket 54, both sides, described jacket head 56 top are respectively equipped with chuck heat conductive oil inlet 5 and chuck thermal oil outlet 6, side, described jacket head 56 top is provided with chuck thermal oil outlet 6, bottom opposite side is provided with chuck heat conductive oil inlet 5, described devolatilizer part comprises devolatilizer inner barrel 59, described devolatilizer cylindrical shell 59 top is provided with vacuum orifice 60 and band lamp visor 67, the volume size of devolatilizer inner barrel 59 and vacuum orifice 60 select magnitude relationship to the devolatilization rate of poly(lactic acid), described devolatilizer inner barrel 59 top is provided with devolatilizer upper cover 61, bottom is provided with devolatilizer lower cone 62, devolatilizer cylindrical shell chuck 63 is arranged with outside described devolatilizer inner barrel 59, described devolatilizer cylindrical shell chuck 63 outer wall is fixed with equipment ear seat 68, devolatilizer lower cone chuck 64 is arranged with outside described devolatilizer lower cone 62, described devolatilizer cylindrical shell chuck 63 and devolatilizer lower cone chuck 64 communicate, bottom described devolatilizer lower cone chuck 64, side is provided with chuck heat conductive oil inlet 5, side, described devolatilizer cylindrical shell chuck 63 top is provided with chuck thermal oil outlet 6, flow deflector 66 is provided with in described devolatilizer cylindrical shell chuck 63, poly(lactic acid) outlet 65 is connected bottom described devolatilizer lower cone 62.
Described middle mixing section comprises the elbow V 57 connected successively, middle mixing section cylindrical shell 32 and elbow VI 58, described elbow V 57 and elbow VI 58 are 90 ° of elbows, described elbow V 57 bottom end connects polymerization reaction zone cylindrical shell 29, described elbow VI 58 bottom end connects flat cover cone end socket 54, described elbow V 57 is provided with charge of intermediation mouth 55, described elbow VI 58 is provided with temperature pressure sensing joint 35, mixed cell V 72 is provided with in described middle mixing section cylindrical shell 32, elbow chuck V 73 is arranged with outside described elbow V 57, elbow chuck VI 74 is arranged with outside described elbow VI 58, middle mixing section cylindrical shell chuck 75 is arranged with outside described middle mixing section cylindrical shell 32, described elbow chuck V 73, bottom middle mixing section cylindrical shell chuck 75 and elbow chuck VI 74, side is provided with chuck heat conductive oil inlet 5, side, top is provided with chuck thermal oil outlet 6, described elbow chuck V 73, middle mixing section cylindrical shell chuck 75 and elbow chuck VI 74 end are all arranged with chuck heat conductive oil inlet 5 and chuck thermal oil outlet 6.
Claims (9)
1. Polylactic acid production system, is characterized in that: comprise mixed reactor and preheating Devolatilization device, connected between described mixed reactor and preheating Devolatilization device by middle mixing section,
Described mixed reactor comprises feed jet mixing section, circulation section group and polymerization reaction zone group, and described feed jet mixing section connects circulation section group, is connected between described circulation section group and polymerization reaction zone group by fresh feed pump,
Described feed jet mixing section comprises feed jet mixing section cylindrical shell, described feed jet mixing section inner barrel is provided with mixed cell I, described feed jet mixing section cylindrical shell one end is provided with material inlet, the other end connects circulation section group, feed jet mixing section cylindrical shell chuck is arranged with outside described feed jet mixing section cylindrical shell, described feed jet mixing section cylindrical shell chuck is provided with chuck heat conductive oil inlet away from material inlet bottom portion, is provided with the outlet of chuck thermal oil near material inlet end top
Described circulation section group comprises mixing section I, mixing section II, mixing section III, conversion zone and recycle pump, described mixing section I, mixing section II, mixing section III, conversion zone and recycle pump are by elbow I, elbow II, elbow III and threeway form ring-type, and described elbow I is located between mixing section II and mixing section III, and described elbow II is located between mixing section III and conversion zone, and described threeway is ligation section respectively, recycle pump and fresh feed pump, described elbow III is located between recycle pump and mixing section I, described mixing section II is located at mixing section I top, described mixing section I comprises mixing section cylindrical shell I, described mixing section cylindrical shell I inside is provided with mixed cell II, described mixing section II comprises mixing section cylindrical shell II, described mixing section cylindrical shell II inside is provided with mixed cell III, described mixing section III comprises mixing section cylindrical shell III, described mixing section cylindrical shell III inside is provided with mixed cell IV, described conversion zone comprises conversion zone cylindrical shell, and described conversion zone inner barrel is provided with hybrid reaction unit I, described mixing section cylindrical shell I, mixing section cylindrical shell II, mixing section cylindrical shell III, conversion zone cylindrical shell, elbow I, elbow II, elbow III and threeway periphery are respectively equipped with mixing section jacket cylinder I, mixing section jacket cylinder II, mixing section jacket cylinder III, conversion zone jacket cylinder, elbow chuck I, elbow chuck II, elbow chuck III and threeway chuck, described mixing section jacket cylinder I, conversion zone jacket cylinder, be equipped with chuck heat conductive oil inlet bottom elbow chuck III and threeway chuck, top is equipped with the outlet of chuck thermal oil, described mixing section jacket cylinder II, elbow chuck I, mixing section jacket cylinder III, elbow chuck II communicates, and is provided with chuck heat conductive oil inlet bottom described mixing section jacket cylinder II, is provided with the outlet of chuck thermal oil bottom described elbow chuck II,
Described polymerization reaction zone group is formed by stacking by multiple polymerization reaction zone, described polymerization reaction zone comprises polymerization reaction zone cylindrical shell, described polymerization reaction zone inner barrel is provided with hybrid reaction unit II, polymerization reaction zone cylindrical shell chuck is arranged with outside described polymerization reaction zone cylindrical shell, bottom described polymerization reaction zone cylindrical shell chuck, side is provided with chuck heat conductive oil inlet, top opposite side is provided with the outlet of chuck thermal oil, polymerization reaction zone cylindrical shell top described in top connects middle mixing section, polymerization reaction zone cylinder body bottom described in bottommost is connected with fresh feed pump by elbow IV, elbow chuck IV is arranged with outside described elbow IV, chuck heat conductive oil inlet is provided with bottom described elbow chuck IV, top is provided with the outlet of chuck thermal oil, described elbow chuck IV top, chuck heat conductive oil inlet and the outlet of chuck thermal oil is all arranged with bottom polymerization reaction zone cylindrical shell chuck top and polymerization reaction zone cylindrical shell chuck,
Described mixed cell I, mixed cell III and mixed cell IV are arranged by left-turn spiral sheet and right-hand(ed)screw sheet interval and form, the horizontal stripe that described mixed cell II is 30 ° by several and axle is welded, described hybrid reaction unit I and hybrid reaction unit II are by the bending tubule of Chinese knot-type shape, described tubule two ends connect inner coil pipe heat conductive oil inlet and the outlet of inner coil pipe thermal oil, and described inner coil pipe heat conductive oil inlet and the outlet of inner coil pipe thermal oil are located at inner coil pipe thermal oil and are imported and exported on cavity;
Described preheating Devolatilization device comprises devolatilization preheater section and devolatilizer part, and described devolatilization preheater section is located at devolatilizer atop part,
Described devolatilization preheater section comprises shell-side cylinder, described shell-side cylinder top is respectively equipped with shell side drain and the outlet of shell side thermal oil, bottom is respectively equipped with shell side heat conductive oil inlet and shell side discharging hole, described shell-side cylinder top is provided with upper tubesheet, bottom is provided with lower tubesheet, between described upper tubesheet and lower tubesheet, central position is provided with interchanger, described interchanger is built with high efficient heat exchanging element, described high efficient heat exchanging element arranges by left-turn spiral sheet and right-hand(ed)screw sheet interval the horizontal stripe formed or be 30 ° by several and axle and is welded, described shell-side cylinder inside is interval with baffle plate I and baffle plate II, described baffle plate I one end is fixed by controlled interval pull rod I, gap is had in vain between the other end and shell-side cylinder inwall, described baffle plate II one end is fixed by controlled interval pull rod II, gap is had in vain between the other end and shell-side cylinder inwall, described controlled interval pull rod I and controlled interval pull rod II top are fixed on upper tubesheet, described upper tubesheet top is provided with flat cover cone end socket, described flat cover cone end socket top connects middle mixing section, jacket head is arranged with outside described flat cover cone end socket, both sides, described end socket chuck top are respectively equipped with chuck heat conductive oil inlet and the outlet of chuck thermal oil, side, described jacket head top is provided with the outlet of chuck thermal oil, bottom opposite side is provided with chuck heat conductive oil inlet,
Described devolatilizer part comprises devolatilizer inner barrel, side, described devolatilizer cylindrical shell top is provided with vacuum orifice, described devolatilizer inner barrel top is provided with devolatilizer upper cover, bottom is provided with devolatilizer lower cone, devolatilizer cylindrical shell chuck is arranged with outside described devolatilizer inner barrel, devolatilizer lower cone chuck is arranged with outside described devolatilizer lower cone, described devolatilizer cylindrical shell chuck and devolatilizer lower cone chuck communicate, bottom described devolatilizer lower cone chuck, side is provided with chuck heat conductive oil inlet, side, described devolatilizer cylindrical shell chuck top is provided with the outlet of chuck thermal oil, poly(lactic acid) outlet is connected bottom described devolatilizer lower cone,
Described middle mixing section comprises the elbow V connected successively, middle mixing section cylindrical shell and elbow VI, described elbow V bottom end connects polymerization reaction zone cylindrical shell, described elbow VI bottom end connects flat cover cone end socket, described elbow V is provided with charge of intermediation mouth, mixed cell V is provided with in described middle mixing section cylindrical shell, elbow chuck V is arranged with outside described elbow V, elbow chuck VI is arranged with outside described elbow VI, middle mixing section cylindrical shell chuck is arranged with outside described middle mixing section cylindrical shell, described elbow chuck V, bottom middle mixing section cylindrical shell chuck and elbow chuck VI, side is provided with chuck heat conductive oil inlet, side, top is provided with the outlet of chuck thermal oil, described elbow chuck V, middle mixing section cylindrical shell chuck and elbow chuck VI end are all arranged with chuck heat conductive oil inlet and the outlet of chuck thermal oil.
2. Polylactic acid production system according to claim 1, is characterized in that: described elbow I, elbow II, elbow III, elbow IV, elbow V and elbow VI are 90 ° of elbows.
3. Polylactic acid production system according to claim 1, is characterized in that: described elbow II, elbow III, elbow IV, elbow VI and threeway are provided with temperature pressure sensing joint.
4. Polylactic acid production system according to claim 1, is characterized in that: be provided with sloper between described threeway and fresh feed pump, is arranged with sloper chuck outside described sloper, and described sloper chuck and threeway chuck communicate.
5. Polylactic acid production system according to claim 1, is characterized in that: be provided with flow deflector in described devolatilizer cylindrical shell chuck.
6. Polylactic acid production system according to claim 1, is characterized in that: side, described devolatilizer cylindrical shell top is provided with band lamp visor.
7. Polylactic acid production system according to claim 1, is characterized in that: described devolatilizer cylindrical shell jackets outer wall is fixed with equipment ear seat.
8. Polylactic acid production system according to claim 1, is characterized in that: the angular range of the apex angle α of described flat cover cone end socket is 140 °-160 °.
9. Polylactic acid production system according to claim 1, is characterized in that: described upper tubesheet is evenly provided with stream pipe, described stream pipe top is provided with the thrust-augmenting nozzle of inverted isosceles trapezoid shape, fits tightly between described thrust-augmenting nozzle.
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| CN201310467826.4A CN103497313B (en) | 2013-10-10 | 2013-10-10 | polylactic acid production system |
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| CN107344088B (en) * | 2017-08-25 | 2023-10-10 | 哈尔滨工业大学（深圳） | Low flow resistance high mass transfer photocatalysis reaction module and reactor based on uniform light field |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1557854A (en) * | 2004-01-16 | 2004-12-29 | 成都新柯力化工科技有限公司 | Process for preparing poly-lacti acid |
| JP2011516636A (en) * | 2008-03-31 | 2011-05-26 | ピュラック バイオケム ビー．ブイ． | Method for producing stable polylactide |
| CN102112521A (en) * | 2008-07-31 | 2011-06-29 | 普拉克生化公司 | Process for the continuous production of polyesters |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1557854A (en) * | 2004-01-16 | 2004-12-29 | 成都新柯力化工科技有限公司 | Process for preparing poly-lacti acid |
| JP2011516636A (en) * | 2008-03-31 | 2011-05-26 | ピュラック バイオケム ビー．ブイ． | Method for producing stable polylactide |
| CN102112521A (en) * | 2008-07-31 | 2011-06-29 | 普拉克生化公司 | Process for the continuous production of polyesters |
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