CN1120466A

CN1120466A - Reactor

Info

Publication number: CN1120466A
Application number: CN 95103663
Authority: CN
Inventors: 金茂筑; 谢鍾英
Original assignee: Beijing Institute Of Chemical Technology Ministry Of Chemcial Industry
Current assignee: Beijing Institute Of Chemical Technology Ministry Of Chemcial Industry
Priority date: 1995-04-07
Filing date: 1995-04-07
Publication date: 1996-04-17

Abstract

The reactor for physiochemical reaction, esp. for polymerization of alkene has a hollow spiral stirror band in it, through which heat-exchange medium may be fed, so combining heat exchange function with stirring. It can bring reaction heat out or heat reaction matter uniformly.

Description

A kind of reactor

The present invention relates to a kind of reactor that is used to realize the material physical-chemical reaction, more particularly, relate to a kind of can the derivation reaction heat in time, perhaps can heat the reactor of reactant equably, be specially adapted to the polymerization process of alkene.

As everyone knows, reactant carries out in the chemical reaction process, and what have emits a large amount of reaction heat, must be in time with its derivation; What have will absorb a large amount of heats, reactant is reached react necessary temperature.

In large production equipment, because the chuck heat-transfer area of per unit volume compares lessly in the reactor, the external jacket type of cooling of depending merely on reactor can not in time derive reaction heat.At present, state's internal olefin batchwise polymerization technology generally adopts the ribbon stirred reactor of being furnished with interpolation finger-type cooling tube, and reaction heat is derived by reactor jacket and interpolation finger-type cooling tube, and ribbon only plays stirring action.

In the patent disclosure specification of Chinese patent CN1065663, Shanghai Medicines Design inst., State Pharmaceutical Administration discloses a kind of polymer reactor, in reactor, arranged several inner sleeves that have heat-transfer area, in inner sleeve, fed heat transfer medium, the reaction heat in the reactor has been derived.There is following shortcoming in such reactor: the installation owing to dactylethrae in (1) reactor has limited the expansion that ribbon stirs diameter, in polymerization process, when solids concentration is higher in the still, form at the still inner rim easily and stir the dead band, cause polymer lumps or local sudden and violent poly-, influence product quality.(2) be distributed in the periphery that ribbon stirs owing to play the interpolation dactylethrae of heat transfer effect, in the higher liquid-solid phase polymerisation of gas-solid phase polymerization reaction or solids concentration, reactant mobile relatively poor, the reaction heat at reactor center position can not in time be derived, and reaction is difficult to control.(3) owing to the existence of above-mentioned two defectives, the expansion of reactor size has been subjected to certain restriction.

The objective of the invention is to overcome the defective that exists in the above-mentioned prior art, provide a kind of stirring abundant, eliminated reactor periphery and stirred the dead band, and in liquid and solid phase reaction or gas-solid phase reaction, can derive reaction heat in time or heat the reactor of reactant equably.

The inventor has proposed a kind of novel reactor through studying for a long period of time.Its reactor be shaped as a circle tube sealing container that is provided with material inlet and outlet at both ends, outer setting at described container has heat exchange jacket, inside at described container, along vessel axis to being provided with the hollow type helical ribbon agitator that can feed heat transferring medium, it combines agitating function and heat exchange function, and this agitator is by the motor-driven rotation that is installed in external container.

In above-mentioned hollow type helical ribbon agitator, the diameter d of ribbon is 0.2～0.96 with the ratio (d/D) of inside diameter of vessel D, and can change the diameter of ribbon on diverse location, the spacing a of ribbon is 0.1～5.0 with the ratio (a/d) of the diameter d of ribbon, and the best is 0.3～3.0; The width b of ribbon is 0.05～0.45 with the ratio (b/d) of the diameter d of ribbon, and the best is 0.1～0.3; The helix angle α of ribbon can be 0 °～90 °.

According to the heat exchange of differential responses and the needs of the situation of mixing, hollow helical ribbon agitator of the present invention can be designed to single ribbon structure, also can be designed to many ribbons structure, and this ribbon can be a continous way, also can be discontinuous, the spiral shell footpath can be identical, also can be different, the cross section of each ribbon can be multiple shape in the agitator, for example circular, oblateness etc., the shape of ribbon can be identical, also can be different, to adapt to the needs of different troubled waters.

In addition, above-mentioned hollow helical ribbon agitator along the top that axially is separately fixed at container and the bottom of container, can be called non-cantilevered ribbon and stir in the inside of container; Also an end of hollow helical ribbon agitator can be fixed on the top or the bottom of container, and the other end is unsettled, is called the cantilevered ribbon and stirs.

According to different heat transfer needs, the heat transfer medium that feeds helical ribbon agitator among the present invention can be selected from water, salt solution, steam etc.

Below in conjunction with accompanying drawing, the present invention is described in further detail.

The schematic diagram of Fig. 1 polymer reactor

The two helical ribbon agitator schematic diagrames of the non-cantilevered of Fig. 2

The two helical ribbon agitator schematic diagrames of Fig. 3 cantilevered

The single helical ribbon agitator schematic diagram of Fig. 4 cantilevered

Among Fig. 1,1 is the vertical and cylindrical airtight container, and container is at the length of the vertical direction internal diameter greater than container, its outside is provided with heat exchange cover 2, cooling fluid import 3, outlet 4, the import of various materials and drain are 5-8, also can increase or reduce as required, and the outlet of material is 9.Longitudinal center's direction of principal axis at container is provided with the hollow helical ribbon agitator 10 that can feed heat transferring medium, and heat exchange function and agitating function are combined.Agitator 10 is by motor 11 driven rotary, and 12 is the following lower shaft envelope of container.

Among Fig. 2, the axis of helical ribbon agitator is 13, and it is a hollow circular tube, with the two

ends

17,18 of hollow circular tube, is separately fixed at the bottom and the top of container along longitudinal center's direction of principal axis of container.Two hollow ribbons have been installed on the axis 13 of helical ribbon agitator, also can a ribbon or a plurality of ribbon be installed according to stirring and the heat exchange needs.It is the diameter d of ribbon that ribbon revolves the diameter that turns around around central shaft 13, and can change the diameter of ribbon on diverse location.A is the spacing of ribbon, and b is the width of ribbon, and α is the helix angle of ribbon.The 14th, baffle plate, heat transfer medium flows into ribbon from the bottom import 15 of ribbon axis, through after each ribbon, flows out from the top outlet 16 of ribbon axis.

Among Fig. 3 and Fig. 4; The axis 13 of ribbon is a sleeve of being made up of two pipes, and one end 17 is fixed on the top or the bottom of container, and the other end 18 is unsettled for sealing, does not join with container, and this helical ribbon agitator is cantilevered.In Fig. 3, two hollow ribbons have been installed on the axis 13, in Fig. 4, a hollow ribbon has been installed on the axis 13.The 14th, baffle plate, heat transfer medium through after each ribbon, flows into the inner sleeve of axis from the outer tube of the import 15 inflow axis of ribbon axis, flows out through exporting 16.

Reactor of the present invention can carry out various types of reactions.For example liquid-phase polymerization, gas phase polymerization, and the polymerisation of liquid-vapor compound mode are specially adapted to the equal polymerization of ethene, propylene and other alkene, and random copolymerization or block copolymerization can obtain the resin dedicated of the different trades mark.

Reactor of the present invention can be expired the still operation, also can be the operation that remains on the certain liquid.

Reactor of the present invention can an operation, also can be many serial operations, and the technological parameter of its reactor can be by computer control.

Reactor of the present invention compared with prior art has the following advantages:

1, owing to designed the hollow type helical ribbon agitator that can pass into heat transferring medium in the reactor, gets Generation be used for the interpolation cooling tube of heat exchange in the prior art, so the diameter that ribbon stirs can fill Divide to strengthen and unrestricted, eliminated the interpolation member because installing in the reactor in the prior art, The periphery that causes stirs the dead band.

2, since among the present invention ribbon mix device and not only have agitating function, also have simultaneously the heat exchange merit Can, improved the heat exchange situation at reactor center position, particularly at gas-solid phase polymerization reaction, solid In the polymerisation of the liquid-solid phase polymerisation that the body substrate concentration is higher or change phase, reactor The heat in centre can in time be derived, and therefore uses this reactor except producing high-quality, many Outside the equal dimerization product of the polyolefin of the trade mark, it is high performance with other also can to produce the block copolymerization product Polyolefin products, it is anti-to carry out the covert attitude polymerization of multistage simultaneously in reactor of the present invention Should, be the polymerization product of exploitation new and high technology, provide a kind of novelty and efficient equipment.

3, in the prior art, when the size of reactor enlarges, the heat-transfer surface of interpolation cooling tube Long-pending relatively less, the reaction heat at reactor center position in time can not be derived, so reactor Size enlarge and to be subjected to certain restriction. And reactor of the present invention has improved reaction widely The heat exchange situation at still center, the expansion of reactor size is unrestricted, has improved reactor list still Production capacity.

Claims

1, a kind of reactor, shell is a circle tube sealing container, be provided with the entrance and exit of material in the upper/lower terminal portion of container, the outside is provided with heat exchange jacket, it is characterized in that: in the inside of container, along its central axis direction a hollow type helical ribbon agitator that can feed heat transferring medium is set, the diameter of its hollow ribbon is 0.2～0.96 of a reactor inside diameter, ribbon spacing and ribbon diameter ratio are 0.1～0.5, ribbon width and ribbon diameter ratio are 0.05～0.45, and the belt screw inclination angle is 0 °～90 °.

2, reactor according to claim 1 is characterized in that the diameter of ribbon is variable on the diverse location of reactor central axis direction.

3, reactor according to claim 1 is characterized in that the hollow ribbon can be continuous, also can be interrupted.

4, reactor according to claim 1 is characterized in that the hollow ribbon is single ribbon.

5, reactor according to claim 1 is characterized in that the hollow ribbon is two ribbons or many ribbons.

6, reactor according to claim 1 is characterized in that the hollow helical ribbon agitator is cantilevered.

7, reactor according to claim 1 is characterized in that the hollow helical ribbon agitator is non-cantilevered.

8, reactor according to claim 1 is characterized in that the cross section of hollow ribbon is circle, triangle, oblate a kind of, or their combination.

9, according to the described reactor of claim 1-7, it is characterized in that the shape in each the ribbon cross section on the hollow helical ribbon agitator can be identical, also can be inequality.

10, reactor according to claim 1 is characterized in that ribbon spacing and ribbon diameter ratio are 0.3～3.0.

11, reactor according to claim 1 is characterized in that ribbon width and ribbon diameter ratio are 0.1～0.3.