CN2067601U - Jacketing intermittent type reactor - Google Patents

Abstract

The utility model relates to a jacketing intermittent type reactor. An outer circulation loop of reaction liquid is formed by that an inner and an outer jackets are respectively arranged on the inner and the outer of a kettle, the bottom of the inner jacket is provided with an axial flow mouth, the middle lower part of the inner jacket is provided with a plurality of reaction liquid backflow holes, and the gap is left between the two layer jackets. An agitator and a plurality of lines of cooling coils are arranged in the kettle. The upper and the lower mouths of the cooling coils are respectively communicated with the outlet and the inlet of cooling liquid. The jacketing intermittent type reactor of the utility model can ensure to carry out reaction under the best condition, having the advantages of large heat exchange area of unit area, good stirring effect, high product yield coefficient, big producing capability and easy operation. The utility model, as new style chemical reaction equipment, is particularly suitable for the production of thiourea dioxide and the reaction of high heat transferring and mass transfer speed such as nitrate and sulphonate.

Description

The chuck batch reactor

The utility model relates to a kind of chemical reactor, specifically is exactly a kind of chuck batch reactor that is used for high heat transfer and mass transfer velocity reaction, belongs to a kind of chemical reaction device.

In the reaction of heat transfer and mass transfer velocity, the key that improves reaction productivity ratio and product quality is to reduce to pay to react.A large amount of studies show that, except that the pH value of medium, reaction temperature is too high and the reaction time is long, is to make to pay the key factor that reaction increases.For example, in the course of reaction that the very exothermic reaction is arranged, if can not in time remove reaction heat, will make temperature drift and overlong time, the good heat transfer effect is removed comparatively fast reaction heat, medium temperature is unlikely too high, and charging rate can improve, thereby has shortened the reaction time.Under the situation that chilling temperature is fixed, the measure one that improves heat transfer efficiency is to increase heat transfer area, the 2nd, improve heat transfer coefficient, and the raising of heat transfer coefficient is mainly by improving mixing effect, so that material becomes the ending flowing state motion in cylinder.Do like this and simultaneously also improved mass transfer velocity, it is more even that reactant is mixed, and also avoided excessive and the phenomenon that formation temperature is too high of local action substrate concentration.

In actual production process, in view of the heat transfer area of jacket type reactor big inadequately, past, toward cooling worm is installed, yet be limited to the diameter of still in still, if the tubulature number of plies is few, heat transfer area improves limited, if the comb number of plies increases, then tube pitch is too little, the resistance of pipe reduces mixing effect, and good stirring is the key factor that improves heat transfer coefficient and mass transfer velocity.United States Patent (USP) 3,355, though it is simple to disclose a kind of cross tubular reactor that is used for successive reaction in 486, but only be applicable to that small lot produces continuously, be difficult to industrial implementation, and reaction efficiency is lower, DRP 2736943 has been reported a kind of bushing type flow reactor, agitator is housed in the central tube, logical freezing liquid in the chuck, reaction mass is entered by the side pipe of several vertical distribution, does not establish cooling tube in this consersion unit central tube, when its caliber is big, can not in time remove reaction heat, and keep high production capacity, under the little situation of caliber, both made extension reactor, can not make charging rate carry De Taigao, otherwise can cause top reaction overheated and cause and pay reaction that desire improves production capacity, need to increase the reaction number, increased equipment investment and operational difficulty.

The purpose of this utility model is exactly in order to solve the deficiency of above-mentioned technology, and a kind of reactor design that is used for high heat transfer and mass transfer velocity reaction is provided.

The utility model is to realize like this.

A kind of intermittent operation reactor that is applicable to, visual response still volume size device number layer cooling worm in a reactor that elongates slightly, the outside of still is the outer chuck of logical cooling fluid, the internal layer of still is the internal layer chuck of logical cooling fluid, the middle and lower part of internal layer chuck has several reactant liquor backflow ducts, leaving the slit between two-layer chuck, is the outer circulation loop of reactant liquor.Internal layer chuck bottom also has the axial flow mouth, and the paddle of agitator is deep into the still bottom, and the diameter of axial flow mouth is not more than agitator paddle diameter.

The end opening of the several layers of cooling worm of arranging in the still enters the mouth with cooling fluid and communicates, and suitable for readingly communicates with cooling liquid outlet.

The general 3-5mm in slit between two-layer chuck is advisable.

The utility model has the advantages that the unit volume heat exchange area is big, mixing effect is good, reactant yield height, industrial implementation easily, reaction time shortens dramatically than common batch reactor, has improved production capacity and product quality.

To be example with the reaction that is used for the synthetic thiourea dioxide of thiocarbamide and aqueous hydrogen peroxide solution below, describe concrete structure of the present utility model (is example with 500 liter capacity reactors) in detail.

Accompanying drawing is the structural representation of the utility model one embodiment

With reference to accompanying drawing:

1, kettle, chuck (interlayer 4-5mm) in 2,3, external jacket (interlayer 4-5mm), 4, axial flow mouth (bore 300-380mm), 5, cooling worm (diameter 32mm), 6, three paddle propeller agitators (paddle diameter 360-400mm), 7, reactant liquor return port, 8,9,10, charging aperture, 11, the refrigerated brine inlet, 12, the refrigerated brine outlet.

As calculated, such reactor total heat conduction area 18M ², dischargeable capacity 0.6M ³, dischargeable capacity is 30 with the ratio of heat exchange area.

It is as follows to be used for this operating process of reacting each cycle:

Add a certain amount of giving by charging aperture 8 by ring pipe and put water, start brine pump, start stirring, add a certain amount of thiocarbamide (be approximately give the weight of putting water 10%) by charging aperture 9, when treating that temperature of charge rises to 0-2 ℃, by the hydrogen peroxide (directly being added to agitator paddle top) of charging aperture 10 control addings 30%, adding speed is advisable not make reaction temperature surpass 15 ℃; Hydrogen peroxide addition and added thiocarbamide add the solid thiocarbamide during near stoichiometric proportion again, repeat said process, all add until raw material, continue stir about 10 minutes, when temperature is reduced to 2-3 ℃, close salt solution.When temperature in the kettle is reduced to 0--1 ℃, can filter by blowing.

The reactor of the present utility model that is used for this course of reaction, because the unit volume heat exchange area is big, mixing effect is good, the pusher spiral shell slurry of rotation is pressed into material vertically at a high speed, send into the outer circulation interlayer, keep turbulence state here, hydrogen peroxide directly joins the vortex of still bottom agitator, be distributed in the medium very soon and go, reaction mainly here reaches in the annular outer circulation loop to be finished, and when material returned the center still by the bottom return port, reaction was finished substantially, can not produce temperature rise again, remainder is how with the further problem of cooling of material.Though at this moment run into the obstruct of multilayer coil pipe, circulation impulse force and gravity addition can keep certain flow rate, liquid level height no matter, and all coiled pipes can both play cooling effect.Produce with such reactor, the solution loss of product thiourea dioxide significantly reduces than the equipment of american documentation literature report, production capacity is big than the DRP introduction, easy industrial implementation, and also easy to operate.

Reactor described in the utility model can also be avoided because liquid level is crossed when hanging down, duct between closed circuit and the still main body, can make the liquid circulation, each discharging if can keep a part in still, then need not add again and give the glove material, can directly carry out following one-period and produce.

Should point out that reactor described in the utility model is except that being specially adapted to as the thiourea dioxide production, also be applicable to reaction as other high heat transfer such as nitrated, semi-annular jade pendant reaction and mass transfer velocity.With regard to concrete structure of the present utility model, resemble the entrance location of reaction mass and what are set and the import of cooling fluid and outlet distribute, the size of the reactant liquor return port of being opened on the interior chuck and what are decided by concrete reaction, just provided a kind of form in the Figure of description, should not be so limited in the reality.

Claims (3)

1. batch reactor, it comprises kettle, charge door, cooling worm, agitator, it is characterized in that the middle and lower part that it also includes interior chuck (2) and external jacket (3), interior chuck (2) has several reactant liquor return ports (7), the bottom of interior chuck 2 has axial flow mouth (4), the diameter of axial flow mouth (4) is not more than the paddle diameter of agitator (6), leaves the space between the inside and outside chuck.

2. by the described reactor of claim 1, it is characterized in that said cooling worm in the discoid placement of kettle (1), end opening and cooling fluid enter the mouth (11) communicate, suitable for readingly communicate with cooling liquid outlet (12).

3. by the described reactor of claim 1, it is characterized in that the slit between the same external jacket of interior chuck (2) (3) is 3-5mm.

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