JPH0819241B2 - Continuous stirring device for viscous substances - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a continuous treatment apparatus for removing volatile substances from a viscous substance, and particularly to continuous stirring suitable for continuous polycondensation of polycondensation polymers such as polyethylene terephthalate. It relates to the device.

[Conventional technology]

In an apparatus that performs a treatment such as polycondensation while continuously stirring while removing volatile substances from a viscous substance, it is required to reduce dead space in the apparatus as much as possible and to perform good surface renewal. To this end, as shown in Japanese Patent Publication No. 50-21514, a plurality of annular supporting plates are fixed to two rotating shafts arranged in parallel, and a scraping plate is attached to the tip of each annular supporting plate. Agitates the inside of the tank thoroughly to minimize the dead space on the inner wall surface of the device, and also lifts the liquid to be treated with a scraping plate to form a square tubular thin film to accelerate the renewal action of the liquid. is there. The optimum viscosity when processing with such a device is about 100 poise (about 10 Pa
s) or more.

[Problems to be Solved by the Invention]

The above-mentioned prior art does not consider low-viscosity stirring, and the viscosity of the liquid to be treated is several poise (0.5 Pa
When it is as low as s) to several tens of poise (several Pa · s), there is a problem that the liquid cannot be sufficiently lifted by the scraping plate and the surface renewal action of the liquid cannot be sufficiently obtained.

The object of the present invention is to obtain a sufficient surface renewal of the liquid to be treated,
Another object of the present invention is to provide a continuous stirring device for viscous substances that can stir a low-viscosity liquid.

[Means for solving the problem]

In order to achieve the above object, a plurality of stirring blades in which the eyebrow plate-shaped members attached to the surface of the rotating shaft are connected by scraping plates are arranged in the axial direction.

[Action]

The low-viscosity liquid to be treated, which is of the order of a few poises, is scooped up by a scraping plate whose sides are separated by an eyebrow plate-shaped member.
While the stirring blade is rotating, the scraping member drops in a film form from one end of the scraping member to form a thin film, and the volatile matter in the liquid to be treated is evaporated. This gives good surface renewal.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS.

In the figure, reference numeral 1 denotes a main body of a stirrer, which is horizontally installed in a cylindrical container having a cross section shown in FIG. 3 and whose outer periphery is covered with a heating jacket 7. The rotating shafts 2a and 2b are provided side by side in the longitudinal direction of the agitator body 1 and are supported by bearings 3 provided at both ends of the agitator body 1. A plurality of eyebrow plate members 4a, 4b are fixed to the rotating shafts 2a, 2b, respectively, in a direction perpendicular to the shafts, and the members 4a, 4b are connected at right angles to the members by scraping plates 5a, 5b. Thus, the stirring blades 6a and 6b are formed. Such stirring blades 6a, 6b are multi-staged on the rotating shafts 2a, 2b so that the phase angle of 90 degrees when viewed from the axial direction, the other rotating shaft 2a, at the tip of one stirring blade 6a, 6b,
It is installed so that it passes near 2b. The rotary shafts 2a and 2b rotate the liquid to be treated in the agitator main body 1 in the opposite directions so as to be lifted from the inside. An inlet nozzle 8 for the liquid to be treated is provided below the end of the agitator body 1, an outlet nozzle 9 for the liquid to be treated is provided below the other end, and further on top of the agitator body 1. A volatiles outlet nozzle 10 is provided. 11 and 12 are a heat medium inlet nozzle and a heat medium outlet nozzle, respectively.

In such a device, the liquid to be treated supplied from the inlet nozzle 8 moves toward the outlet nozzle 9 while being subjected to the stirring and mixing action by the stirring blades 6a and 6b, and performs a target treatment operation such as polycondensation. The volatile matter generated in the stirrer body 1 is continuously extracted from the outlet nozzle 9
Taken out from 10. In this case, the liquid to be treated is cocoon-shaped plate-like members 4a, (4b) in the agitator body 1 as shown in FIG.
Scooped up on the scraping plate 5a, (5b) partitioned by, and dropped into a film (13 in Fig. 4) from one end of the scraping member on the surface on which the stirring blades 6a, (6b) rotate, forming a thin film, Volatile substances in the liquid to be treated are evaporated.

When performing continuous polycondensation of polyethylene terephthalate (polycarbonate) or the like with this device, for example, an intermediate polymer having a viscosity of several poise is continuously supplied, and the heating jacket 7 heats the inside of the stirrer body 1 to 260 to 300 ° C. Then, a decompression device (not shown) such as a vacuum pump is connected to the volatile matter outlet nozzle 10 to maintain a vacuum pressure of about 1 Torr to about 10 Torr.
The intermediate polymer, which is the object to be treated in the stirrer main body 1, undergoes a good surface renewal action as described above (see FIG. 4) to evaporate volatile substances such as ethylene glycol and water, and polycondensation occurs. Then, it becomes a high-viscosity polymer of several thousand poise and is continuously taken out from the outlet nozzle 9.

According to the preferred embodiment of the present invention, as shown in FIG. 5, the number of eyebrow-shaped plate members 4a, 4b is increased on the side of the inlet nozzle 8 of the stirrer body 1 (left side in the drawing) (4a). (The pitch between 4a and 4b is made small) By using the stirring blades 6a 'and 6b', the number of the cocoon plate-shaped members 4a and 4b is reduced toward the outlet nozzle 9 side (right side in the figure) of the stirring device body 1 (4a (The pitch between 4 and 4b is made large.) The stirring blades 6a ″ and 6b ″ are used. According to the present embodiment,
The effect of scooping up the liquid to be treated by making the cocoon-shaped plate-like member dense at a place where the viscosity of the liquid to be treated on the inlet side in the agitator body 1 is low is enhanced, and the viscosity of the liquid to be treated on the outlet side in the agitator body 1 is enhanced At a high temperature, since the increase in the film thickness of the scooped-up liquid to be treated can be suppressed by an appropriate amount, the stirring treatment can be performed in the stirring device main body 1 under the optimum conditions.

According to another preferred embodiment, as shown in FIG. 6, there is one using a perforated eyebrow plate member 4a ', which is scooped up on the scraping plate 5a in this embodiment. A part of the liquid to be treated falls in a thin film form on the perforated portion 14 of the cocoon-shaped plate member, and during this period, the effect of promoting evaporation of volatile matter is obtained.

According to still another embodiment, as shown in FIG. 7, a weir plate 15 as shown in FIG. 8 is provided on the lower half of the agitator body 1 between the agitating blades 6a, 6b in the directions of the rotating shafts 2a, 2b. There is one in which the inside of the main body is divided into a plurality of stages by mounting. According to the present embodiment,
The liquid to be treated picked up on the scraping plates 5a and 5b is
It is possible to prevent back-mixing or short pass in the longitudinal direction of the agitator body 1 by flowing down in the directions of a and 2b, and to bring the inside of the agitator body 1 close to the state of piston flow to improve the quality of the liquid to be treated. You can

Also, in another embodiment, the outlet nozzle 9 of FIG.
As shown on the (right side of the figure) side, there is one in which a scraping rib 16 is provided on the outside of the eyebrow plate-shaped members 4a, 4b. In the present embodiment, the ribs 16 can promote the stirring of the lightening treatment liquid in the respective gaps in the rotation axis directions of the stirring blades 6a ″, 6b ″.

The continuous stirring device of the present invention can be used to perform continuous polymerization of a polycondensation polymer with enhanced volatile matter evaporation performance in a low viscosity range and an expanded processing viscosity range.

〔The invention's effect〕

According to the present invention, since the evaporation of volatile matter from a relatively low viscosity can be promoted, the surface of the liquid to be treated can be sufficiently renewed,
Continuous treatment such as polycondensation in a wide viscosity range can be carried out with a short residence time.

[Brief description of drawings]

FIG. 1 is a partial sectional plan view of a continuous stirring apparatus according to an embodiment of the present invention, FIG. 2 is a partial sectional front view taken along line II-II of FIG.
1 is a sectional view taken along the line III-III in FIG. 1, FIG. 4 is an explanatory view showing the flow down of the liquid to be treated, and FIGS. 5 to 8 are explanatory views of other embodiments of the present invention. 1 ... Stirring device main body, 2a, 2b ... Rotating shaft, 4a, 4b ... Mayu plate-shaped member, 5a, 5b ... Scraping plate, 6a, 6b ... Stirring blade

Claims (3)

[Claims] 1. A heating apparatus, wherein two rotary shafts are provided in parallel inside a cylindrical container installed substantially horizontally, an inlet of the liquid to be treated is provided at one end, and a liquid to be treated is provided at the other end. In the continuous stirrer having a protrusion, a plurality of eyebrow-shaped plate members are fixed to the two rotating shafts in a direction perpendicular to the shafts, and the plate-shaped members are perpendicular to the brow-shaped plate members. Stirring blades are formed by connecting them with a scraping plate, and the stirring blades attached to the two rotating shafts and corresponding to each other are arranged so as to have a phase angle of 90 degrees when viewed from the axial direction, The two rotating shafts are installed such that the tips of one stirring blade pass close to the other rotating shaft, and are rotated in the opposite directions from the inside to the outside of the container body. A continuous stirring device for viscous substances, characterized in that the liquid to be treated is scraped up by a scraping plate partitioned by . 2. The plurality of cocoon-shaped plate-shaped members are characterized in that the number of cocoon-shaped plate-shaped members is increased on the inlet side of the container body, and the number is gradually reduced toward the outlet side. A continuous stirring device for viscous substances according to item 1. 3. The container main body is provided with a weir plate in a gap between the stirring blades formed by a plurality of eyebrow plate-shaped members and a scraping plate in a direction of a rotation axis of the stirring blade, and a plurality of container plates are provided in a longitudinal direction in the container main body. The continuous stirring device for viscous substances according to claim 1, wherein the viscous substance is divided into stages.