DE1962464A1 - Device for the volumetric suction of viscous liquids from apparatus operating under vacuum, in particular for the continuous production of polymers - Google Patents

Description

1962484

Dk, Ing.ERNST MAIBE DiPL ₁ -ING. klaits βειπνγ

PATEIfXAHTVAM

8 MUNICH 23 DlFL.-PiiYS. houeiw μιλ-α

. B · ΤΒϋΕϊΌΝ £ 2 20 00, £ »5192 PATENT AGENCIES

A 48269 December 12, 1969

B / hu

Company SNIA VISCOSA SOCIETA * NAZIONALE INDUSTRIA APPLICAZIONI VISCOSA; 18, Via Montebello, Milan, Italy

Device for the volumetric suction of viscous liquids from apparatus operating under vacuum, in particular for a continuous production of polymers

The invention relates essentially to a pumping means functioning device for the continuous and metered suction of gas and volatile particles Liquids of medium and high viscosity from apparatus and parts of facilities, their space under sub-atmospheric pressure, if not kept under high vacuum at all. In particular, the invention relates to a Device for continuous volumetric suction of the product from reactors and apparatus for the treatments

To the

German Patent Office

8 Munich- 2

009-82771314

and for intermediate and final processes in the manufacture of polymers, especially polyesters and polyamides.

In the manufacture and continuous treatment of such polymerized materials or in the course the completion of their polymerisation process in reactors and apparatus, their treatment rooms under subatmospheric conditions Pressure, mostly under high vacuum, result known difficulties with regard to a continuously metered volumetric suction of the product in question. The product of such intermediate and final treatments actually exhibits physically unfavorable properties, such as regarding its viscosity, which is also very high values on the order of a few and even several hundred Poises can assume, and in particular because of its property of discharging gaseous particles. These products also require strict adherence to very specific heat conditions, as it is generally a very limited area of temperatures below which the material does not remains in the desired state of protection, and beyond that Show signs of decomposition.

The lack of pressure inside the rooms from which the tough materials to be extracted, and the substantial ones Resistance in advancement within the pipelines

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demand for transferring the material to the subsequent treatment "or processing means that the continuous Materlalabsaugung of the said apparatuses is performed by devices in the location" are to exert a pumping action. For these reasons, these devices are practically formed by mechanical pumps of various types, for example capsule pumps or gear pumps, sebum gear pumps and others »

For the reasons mentioned above and for other reasons, these pumps work under particularly unfavorable conditions, and precisely with regard to their suction and capacity of a uniform suction with complete filling of the spaces and passages. One has to take into account that the _5-resistant in itself Material * repels which 'zudem'dauernd'gasförmige particles only sehwach Biaia Eintoiingen in. the pump organs is affected.

Among the known pumping means, theoretically speaking, it is precisely the pumps with several pump screws (also called spindle pumps) that should produce the more favorable results, precisely because of their characteristic regularity and uniformity in the discharge and because of their good volumetric properties, which are based on the usual technical

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1962-64

On the other hand, multi-screw pumps based on knowledge have * Difficulty in suction under the conditions described and prove to be quite high Temperatures as unsuitable, mainly because of the uneven pumping capacity and the impossibility of being considerable To generate output pressures.

The invention seeks to provide an apparatus

t
for the continuous volumetric suction of highly viscous liquids with the discharge of gaseous particles from apparatus of the type specified and for the previously considered use, which is suitable for eliminating or at least reducing the inconveniences and operational difficulties that occur with the devices usually in use.

In particular, the invention relates to an apparatus for the same or equivalent purposes, being them as the actual means of pumping, one of several sjlindric ones Represents screws formed system and the pumping system of pumps with several parallel and counter-rotating screws that mutually engage in their generators, wherein the system is suitable, in the area of its entrance or. Suction part completely fills the space

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to ensure between the screw threads of several pump screws before the screw threads of the pump screw system come into mutual engagement with each other.

It is also an object of the invention to provide a suction device to create with several pump screws, which has the aforementioned properties and also structural and operationally with the apparatus from which the suction | has to take place, connected 1st, so that said complete filling of said screw grooves directly in the Inside the apparatus takes place, so that every intermediate ^ Passage in which cavities or the formation and retention of gaseous inclusions could occur is avoided.

Another purpose of the invention is to provide a suction device which, in addition to the aforementioned properties, has the peculiarity of essentially giving rise to the material uniform temperature throughout the run to ensure by the device.

The device according to the invention is essentially characterized in that it has a pump mechanism has several screw caps, preferably with three cylindrical and parallel screws, which interlock with each other, the end part of said mechanism in the Space extends into it, from which the viscous liquid can be

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take is, and the said end portion is amply dimensioned Has inlet openings which are aligned radially with respect to the screws, and that opposite them Part of the screws is completely exposed while the remaining part of the screw lies below this end part so that the viscous liquid touches the exposed screw Reaches unhindered and fills the screws in their entire circumference from J560 ° before the gears in these grooves another screw or several visual screws intervene.

Preferably a three screw pump mechanism with a central screw is used, whose shaft is extended to the outside of the device, there is connected to a drive means and the side

drives.

arranged screws & na & x & hL ·. The side screws extend into the interior of the apparatus from which the liquid is to be drawn off, while the. middle screw ends approximately at the level of the inlet end of the bearing housing of the screws.

Preferably the device is also in one housed tubular outlet of the treatment device and of a cavity surrounding the treatment room surrounded by a heating medium flowing through it * piping

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Housing ensures that the pumping mechanism is heated practically over its entire length. Furthermore can one or more heating mantles that attach to the lamp housing are structurally connected, be arranged next to the connecting pieces.

The device is also on the part where the

PURipenmechanism actuating drive shaft exits ^ |

provided with suitable for relatively high temperature sealants, _s whose sealing members asbestos fiber rings like consist of, for example, with a Stopfbtichse or.

Subsequently is a preferred embodiment of the invention with reference to the drawings. «Show it?

Pig. 1 shows a device according to the invention with some simplifications of constructional details in longitudinal section with the screws of the pumping mechanism; |

2 shows a partial longitudinal section on a larger scale through the entry-side part of the device;

5 shows an end plan view of the device and FIGS. K and 5 are cross-sections according to the section lines IV, IV and V-V in FIG.

In the embodiment according to FIG. 1, the device is a polymerization reactor or equivalent associated, which is of a substantially vertical chamber type; the wall 10 of this chamber is through

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a shell 14 delimited »cavity 15 surrounded, in which flows a heating medium, such as diphenyl

a

or similar medium used in the technology of this subject is known. The wall IO goes into one at 16 tubular connector 15 over, detfsetoenfalls from the cavity 15 is surrounded.

Such application of the device is exclusive for example. That of the invention appropriate suction device can of course under equivalent conditions as has been described, also attach to apparatus of other types, for example to horizontal reactors, reactors, demonomerizers and on other devices, possibly equipped with discharge screws and other devices, insofar as a part with an exit is available is located in a zone below the treatment room is located and in which the latter the treated liquid mass 12 to be sucked off has a certain liquid level 11 maintains.

The suction device comprises a tubular housing 20 and a pump body 21 arranged therein as a seat for receiving the screws which the movable components of the pumping system, namely a central screw 22 and two side screws 25.

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The middle screw 22 runs in an extension 24 from, which extends outwards and thereby with a outwardly going shaft 25 is connected, the outer end 26 in a known manner directly or by transmission means with a motor, not shown is coupled.

As can be seen in particular from Figures 1 and 2, the tubular housing 20 protrudes into the treatment chamber and is provided with a number of lateral openings 30, through which the liquid to be sucked off can freely enter the interior of the said housing in the areas shown in FIG . 1 with ¹¹ A "has indicated directions.

Free access for the said liquid to the The interior can thereby advantageously be improved « that the upper lock 3 * of the housing also has openings

'■■■■■■■' ■■ ί

or has passages 32 (Figs. 2 and 3) «^

The hollow body 21 and the central screw 22 end below the vestibule with the said passages or side windows 30, while the lateral screws £> ■ o w "it protrude upwards" that their upper ends 23 · completely exposed into the penetrating of all seldom ·

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Liquid or the upper cavity 2 Oh ine protrude.

The liquid penetrating into this cavity follows the action of gravity. Xn considering the vastness The inflow cross-section results in a good inflow of fluids.

just like toon this cavity, the volatile ones separating from the liquid flow from it Particles liberate boldly, as will be done in the very next Near the screw occurs. The escape of the through that Secretion of the volatile particles formed oas bubbles is particularly facilitated by the upper openings 32

The liquid in the said cavity fills the screw grooves on the upper part of the lateral screws 23 * » which are completely exposed, so the liquid in Excess enters the zone of engagement between the central screw and the side screw. To this Way is a completely volumetric filling of the pumping mechanism and thus also a regular and metered suction. The Fuapffekt extends over the full usable length of screws. Since the screws with the Most of its length lie in the area of the lower extension of the heating cavity 13 »is uniform Heat of the liquid to be sucked off by means of the pumping action valid.

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Extend at the lower end of the inner hollow body 21 the lateral screws with exposed threads 23 * · (Pig. 1) in the outflow chamber 40 of the device, while the middle screw has a threadless extension 24. From the annular passage 41 of the Ausflußkaramer 40 can liquid into the pressure line 42 enter.

The parts encasing the outflow chamber 4o as well as the passage 41 and the pressure line 42 advantageously have Cavities 51 and 52, in which by suitable connections 53 and 54 a heating medium flows.

The housing 20 of the pumping device is on the treatment apparatus attached by means of a flange 45 which remains connected to the housing 20, while on the other hand the apparatus with a flange 44, which is in particular on the Pipe end 15 is seated.

The rotating organs are in a bearing part 45 stored or supported on it, which is attached to the Puapengehäuee by means of a flange 4 [6. The middle screw is supported with a collar in the bearing part 45 in the longitudinal direction, while the two lateral screws 23, which are in opposite

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Rotate the current direction of rotation on the upper locking base jjl, for example by means of plate extensions 47 (Fig. 2) support axially.

As can also be seen from FIG. 1, the part 45 has a tubular stuffing box 48 in which a set 49 of ring seals, for example made of asbestos fiber is located as a stuffing box packing, which means a stuffing box nut 50 can be pressed.

Advantageously, for example through a feed line 55, one cannot enter the stuffing box reactive or not narrowable with the treated polymer Buffer liquid are introduced and kept under a suitable pressure, for example by using Nitrogen.

00982 7/13 U

Claims (7)

PATENT CLAIMS IΛ Device for the volumetric suction of viscous liquids from apparatus operating under vacuum, in particular for the production and continuous treatment of polymers, polyesters and polyamides, such as intermediate and final process reactors for polymerization or polycondensation, demonomerization * etc., characterized in that it consists of a pump mechanism consists of a plurality of parallel screws (22, 23) which interlock along their generatrices in Purapena body (21) work, part of these screws protruding exposed into the interior of a room or chamber (at 30) from which the liquid is to be sucked off 1st, while the remaining part or screws and the pump body (21) end below said chamber, so that the liquid contained therein unimpeded in the Screw grooves of the exposed part (23) of the screws I before interlocking with the remainder of the screws enters and fills it completely. 2. Apparatus according to claim 1, characterized in that the components forming the pump mechanism in a housing (20) are housed at one end - 14 - 009827 / 13U the inlet chamber is formed, the lateral openings (50) for the essentially radial inflow of the Having liquid in the free cavity to the exposed screw parts. after 3. Devices - claims 2 and 3, characterized in that the housing (20) for the axial Secure the outer screws (23) with a plug or closure means (3I) is completed and this preferably also has breakthroughs or openings (32), in particular the exit of the upward serve for volatile particles that escape from the liquid. 4. Device according to one or more of the preceding Claims, characterized in that the pump housing (20) at least partially from the one with the treatment · ™ chamber connected heating jacket (IJ) is surrounded, and the usable part of the screws (22,23) is in the area surrounded by the heating jacket (13) * 5. Device similar to one or more of the previous ones Claims, characterized in that the rotating components of the pumping mechanism are driven by a shaft (25), and the shaft against high temperatures resistant sealant crosses. QO 9827/1 3 -U - 15 - 6. Device according to claim 5 * characterized in that that said sealing means consists of a stuffing box (48) with asbestos fiber packing, which may be soaked with a buffer liquid. 7. Device according to the preceding claims, characterized in that the pump mechanism is coaxial with the mile (25) connected to the middle screw © (22), which is supported in the bearing (45) by an axial bearing, and two lateral screws (23) are provided which extend upwards and are supported by the plug or closure means (Jl). "Β" aw α "" a c -0 09827 / 1-3U