WO2015022285A1

WO2015022285A1 - Device for degassing a fluid

Info

Publication number: WO2015022285A1
Application number: PCT/EP2014/067147
Authority: WO
Inventors: Christian HÖRAUF; Jochen Bauer
Original assignee: Bauer-Verfahrenstechnik-GmbH
Priority date: 2013-08-12
Filing date: 2014-08-11
Publication date: 2015-02-19
Also published as: EP3033166A1; DE102013108709A1

Abstract

The present invention relates to a device for degassing a gas-laden fluid, having a vessel (12) in which at least one membrane module (20), having an inner side and a radial circumference, for separating a gas from the fluid is accommodated, wherein the fluid is supplied centrally to the membrane module (20) over the structural depth thereof by means of an inlet (30), is discharged via an outlet (35) on the vessel, and the gas is discharged from the membrane module (20) via a further outlet (37) on the membrane module (20), and the fluid flows through the membrane module (20) from the inner side to the radial circumference. The device is distinguished by the fact that the membrane module (20) is accommodated in the fluid of the vessel (12), wherein the fluid in the vessel (12) outside the membrane module (20) is at a substantially uniform pressure, or the pressure differences outside the membrane module (20) are compensated by pressure equalization in a distributor pipe (31), such that the pressure drop of the membrane module (20) between the inner side thereof and the radial circumference is substantially constant over the entire structural depth.

Description

Device for degassing a fluid

The present invention relates to a device for degassing a

gas-laden fluid, a dispersion, suspension or emulsion. The use of a gas-laden fluid can lead to loss of quality, malfunction or even damage to the device using it. It is therefore desirable for many applications and processes a degassed fluid. Devices and methods for degassing a gas-laden fluid are in

Known in the art. For example, chemical methods are used, e.g. using suitable reducing agents or by means of so-called.

Venting additives or by means of viscosity-reducing additives. Furthermore, thermal processes are known in which the fluid to be degassed on a

Temperature is heated near the boiling point. Other methods too

Degassing uses ultrasound, resulting in the union of small bubbles into larger bubbles, which then migrate to the surface. There are also numerous degassing devices and methods based on vacuum degassing; For example, a device is used in which to a housing with the fluid, a negative pressure - often called "vacuum" - is applied; to

Support can still rotate a disc in the fluid. For some

Devices for degassing membranes are also used. Such membranes contain in the core a cartridge, which is composed of many tubes. The walls of these tubes are permeable to gases but impermeable to liquids. The gas-laden fluid is pressurized into the inside of the

Cartridge pressed so that the cartridge is flowed through by the fluid from the inside out. In this case, a negative pressure is applied to the tubes, wherein due to the difference of the partial pressure, the gas from the passing fluid is withdrawn. The said cartridge is located in a pressure housing. The degassed fluid is collected at an outlet and can then be used for the intended purpose.

Among other things, this device has the following disadvantages: In the housing, a pressure gradient forms from the interior of the cartridge to the outlet opening. The flow of the fluid follows this pressure gradient. Areas of the cartridge, which are outside of this flow, are poorly or not at all flowed through. Therefore, this structure does not use the entire capacity of the membrane. Furthermore, this is due to the lower flow on the edge of this

Flow paths Areas in which the solids are e.g. from the to

Depositing degassing dispersion. As a result, these areas of the membrane are blocked by these solids, wherein the pressure in the housing further promotes this blocking. This process of blocking can be from a few minutes to several hours, depending on the nature of the dispersion. If the membrane is blocked, it can no longer be used for degassing and the degassing process may need to be interrupted for cleaning or membrane replacement. Such a device is therefore not suitable for continuous operation. If the membrane is not cleaned immediately when blocked, it can even be permanently damaged. Against this background, it is an object of the present invention, at least partially overcome or to improve the disadvantages of the prior art.

The object is achieved with a device according to claim 1 and a method according to claim 14. Preferred embodiments and modifications are

Subject of the dependent claims. A device according to the invention for degassing a gas-laden fluid has a container in which at least one membrane module, with an inner side and a radial circumference, for the separation of a gas is taken up by the fluid. In this case, the fluid is supplied to the membrane module via its overall depth by means of an inlet centrally and discharged via a drain on the container. The gas separated from the fluid from the membrane module is removed via a further drain on the membrane module and the fluid flows through the membrane module of the Inner side to the radial extent. In this case, the fluid in the container outside the membrane module substantially a uniform pressure, or the

Pressure differences outside the membrane module are by a

Compensated pressure compensation in a distribution pipe as part of the fluid supply to the membrane module, so that the pressure drop of the membrane module between the inside and the radial circumference over the entire depth in

Is essentially constant.

The gas-loaded fluid may be a dispersion, suspension or emulsion.

Such fluids typically have a gas content of up to several percent after their manufacture or delivery. This gas content often leads to disadvantages in the further use of the fluid. Thus, the gas content in steam or hot water systems can lead to increased corrosion or even damage to the system due to cavitation. For ink jet printers, the gas content can cause printer errors or even clogging of the nozzles. For paints, the gas content can cause a deterioration of the surface quality. In the surface finishing of fibrous webs, such as in the paper industry, the proportion of gas in a coating color, if

For example, by means of curtain coating, roller, sump or nozzle coating is applied, lead to a faulty paint application. For these and many other applications, it is necessary to reduce the gas content of the fluid by degassing.

For this purpose, in a device according to the invention, a membrane module is used, as used in the prior art e.g. as membranes of the brand Liqui-Cel® or

SuperPhobic® from the company Membrana is known. The invention

Membrane module is made of a variety of substantially parallel

Membrane tubes, membrane hoses or hollow fibers constructed. The walls of these tubes are permeable to gases, but impermeable to liquids, so that the gas of the gas-laden fluid can collect in these tubes. A device according to the invention is constructed so that the gas-laden fluid from the outside via an inlet centrally, i. in the radial center of the membrane module is supplied. The gas-laden fluid is in the radial center of the

Membrane module in a distribution pipe in its overall depth further guided; this distribution tube forms the inside of the membrane module. Said membrane module is in a container which contains the degassed fluid outside the membrane module. The radial circumference of the membrane module forms the contact point for the degassed fluid. The container has a drain through which the degassed fluid can be removed. Of the

Inside the membrane module - the central distribution pipe - towards the container, the membrane module is flowed through from the inside to the outside of the fluid. In addition, the membrane module has a further outlet, via which the gas which has been taken from the fluid is removed from the membrane module. The membrane module is preferably completely contained in the fluid contained in said container. This is after the start of the

Device the degassed starting fluid. In the case of a device according to the invention, the fluid in the container outside the membrane module has essentially a uniform pressure, in the simplest case atmospheric pressure, i.

neither the container nor the fluid outside the membrane module is subjected to an overpressure or negative pressure, but the container is kept open at atmospheric. A lid of this container therefore need not withstand pressure, but only serves to protect against contamination from outside or similar purposes. Because the fluid in the container outside the membrane module in

Having substantially uniform pressure, the pressure drop of the membrane module between the inside and the radial circumference over the entire depth is substantially constant.

The device according to the invention thus has considerable advantages over the prior art: no constructional measures are required to provide the said container pressure-resistant. Furthermore, results from the

Inventive arrangement that the membrane module of the fluid in

Substantially through the entire depth between the inside and the radial circumference of the membrane module is substantially uniformly flows, because the pressure drop from the central inlet to the periphery of the membrane module is substantially uniform over its entire length. As a result, the flow capacity of the membrane module is much better utilized, because it by the mentioned

Arrangement no main flow direction within the membrane module, but the fluid flows around all sections of all the tubes of the membrane module at a certain speed. In addition, it prevents the formation of areas with a lower flow, in which the solids of the

Deposit dispersion. The membrane module is thus not blocked by the solids of this dispersion. For these reasons, it results as a further advantage that the device according to the invention is suitable for continuous operation.

In one embodiment of the invention, a membrane module may be so long and substantially vertical in the starting fluid that the hydrostatic pressure of the fluid causes the fluid in the container outside the membrane module to no longer have a uniform pressure. This would lead to different pressure differences over the depth of the membrane module without compensation. For this reason, in such an arrangement of the membrane module whose inside - ie the distribution pipe - through

Influencing the flow, for example by adapted flow barriers, be designed so that the pressure drop of the membrane module between the inside and the radial circumference over the entire depth is substantially constant.

In one embodiment of the device according to the invention, the fluid in the container outside the membrane module is at substantially atmospheric pressure.

As mentioned above, neither the container nor the fluid outside the membrane module is subjected to a positive or negative pressure, but the container is kept open at atmospheric. A lid of this container therefore need not withstand pressure, but only serves to protect against contamination from outside or similar purposes. An embodiment of the container thus has an overpressure of 0 bar. However, another embodiment of the container can - for example, for reasons of safety or to further reduce contamination from the outside - a slight overpressure (between 0 and 1 bar) have.

In order to carry out the degassing effectively, it makes sense to apply a negative pressure to the outlet of the membrane module for the gas, preferably one Underpressure of 50 to 800 mbar and in particular a negative pressure of 300 to 400 mbar, each based on the atmospheric pressure of the environment.

The gas-laden fluid is acted upon in a device according to the invention with an overpressure to supply it to the central inlet of the membrane module. In this case, an overpressure of 1 to 12 bar and in particular an overpressure of 1 to 8 bar is preferably applied to the fluid at the inlet, in each case based on the atmospheric pressure of the environment. As a result, both a differential pressure compared to the degassed fluid in the housing is constructed and a partial pressure relative to the gas, which is withdrawn from the fluid by means of negative pressure. The membrane module, as used for a device according to the invention, has a multiplicity of membrane tubes or membrane tubes. In particular, it has hydrophobic membrane hollow fibers made from at least one of the materials selected from a group consisting of polysiloxanes and / or their derivatives, fluoroelastomers such as fluororubber (FKM), polytetrafluoroethylene and / or derivatives thereof, polyolefins, and / or their derivatives, polyethylene and polypropylene, combinations thereof and the like.

The said membrane tubes or membrane tubes, in particular also the hydrophobic membrane hollow fibers, are preferably arranged substantially parallel to a distribution tube following the inlet for the fluid. Thus, the membrane tubes are arranged perpendicular to the main flow direction. By this arrangement, a close contact and a large contact surface between the fluid and the membrane tubes is ensured, and thus an efficient degassing.

The membrane tubes or membrane tubes, in particular also the hydrophobic membrane hollow fibers, are arranged in a fabric. In a first embodiment, the central distribution tube is cylindrically shaped, i. with the same diameter over the entire length of the

Distribution tube. A further advantageous embodiment has a

variable diameter over the length of the distribution tube, so that results in a conical shape. With this configuration, pressure differences between the central inlet and the opposite end of the Distribution tube are balanced. In particular, a cross-flow distributor can be used to compensate for differences in pressure between the inlet side and the end section of the feeder, or to take pressure differences, which are caused by the arrangement of the membrane module, for example in the vertical direction, into account during the design of the device and accordingly

adapt. As a result, e.g. be ensured that the differential pressure between the inside and outside of the membrane module is kept constant over the depth of the module and thus a uniform application of the module or all membrane tubes can be achieved. The membrane tubes or membrane tubes, in particular also the hydrophobic membrane hollow fibers, are arranged on a plurality of circular radii, which are arranged substantially coaxially to the distribution tube.

Turbulence generators, preferably in the form of an agitator, are arranged in the container and outside the membrane module. By such a stirrer, the degassed fluid is in continuous motion. This continuous movement prevents sticking or blocking of the degassed fluid in the container by separating the components of the dispersion. Such blocking could lead to a loss of performance of the device or even damage the device. However, it must be avoided that additional gas is introduced into the already degassed fluid by the stirring. This can

For example, take place in that the container is closed by the outside air or by the arrangement and / or speed of the agitator no air is introduced into the fluid.

In a further embodiment, the container is designed to be closed and has a pressure compensation device. This configuration prevents contaminants or air from being introduced into the container. Another advantage is that the hardening of the surface - forming a so-called "skin" - thus significantly reduced. This effect can be further enhanced in a further embodiment by an increased humidity. The with these

Embodiments connected pressure compensation device causes the pressure in the container continue to the atmospheric pressure of the environment in the Substantially does not exceed and thus retains the beneficial effects and favorable pressure-free design of the device.

The fluid is a suspension, emulsion or dispersion, as is preferably used for painting paper, board or paperboard, and more preferably a solids content between 5 and 75% by weight, preferably between 35 and 70% by weight and especially between 65 and 70% by weight. However, this does not mean that a device according to the invention is limited to these fluids. One skilled in the art can readily determine from the advantageous features of the present invention other uses for this device, for example, for various types of printer inks, such as those described in U.S. Pat. For

Inkjet printers are used for paints, casting resins, in the

Plastic production, or the like.

The device may comprise only one or a plurality of membrane modules. For a relatively simple scalability of a system according to the invention with increased power requirements can be achieved. In a further embodiment, this device is also cascadable to an even further degassing

perform.

Another embodiment of the present invention is a method for degassing a gas-laden fluid, comprising the steps of: introducing the gas-laden fluid, in particular a coating color, by means of an overpressure into an inlet of the fluid on an outer surface of

Membrane tubes of a membrane module;

Applying a negative pressure on the inside of the membrane tubes of

Membrane module for removing the gas separated from the fluid; the fluid flows through the membrane module and its membrane tubes from the inside to the outside;

Receiving the degassed fluid immediately outside the membrane module in a substantially pressure-free container;

Discharge of the degassed fluid via a further drain on the container. These steps are by no means to be considered strictly serial steps. Rather, they also partially run parallel during a process according to the invention.

Moreover, the explanations given to the devices according to the invention also apply mutatis mutandis to the method according to the invention.

A device according to the invention can be used for degassing a multiplicity of gas-laden fluids, in particular a dispersion, suspension or emulsion. Particularly suitable is a device according to the invention for degassing a dispersion, suspension or emulsion, consisting at least of water, binder and pigment, as it is preferably used for brushing paper, cardboard or paperboard, and more preferably a

Solids content between 5 and 75% by weight, preferably between 35 and 70% by weight and in particular between 65 and 70% by weight, or of a coating color for use in curtain coating, roll coating, sump coating or jet coating in paper finishing ,

The invention will be described with reference to various embodiments, it being understood that the invention is not limited to the embodiment shown here, but rather also corresponding

Modifications are also within the meaning of the present invention. Showing:

Fig. 1 a is a schematic representation of a device for degassing according to the prior art in a longitudinal section;

1 b a schematic representation of a device for degassing according to the prior art in a cross section; 2a is a schematic representation of a device according to the invention for degassing in a longitudinal section;

2b shows a schematic representation of a device according to the invention for degassing in a cross section; Fig. 3 is a schematic representation of another invention

Device for degassing in a longitudinal section.

Fig. 1 a shows schematically a device for degassing 1 according to the prior art in a longitudinal section. In this case, there is a membrane module 20 in a pressure-resistant housing 10. The membrane module 20 is supplied via a feed 30 corresponding to the arrow with the gas-laden fluid. This gas-laden fluid is at the supply 30 under an overpressure preferably of several bar, based on the ambient pressure outside the housing 10. This overpressure presses the gas-laden fluid - as indicated by arrows 33 - in the membrane module 20. This membrane module 20 is made of membrane tubes or membrane tubes 21 which are arranged substantially parallel to the axis and on concentric radii to the distribution tube 31. At a drain for the gas 37, a vacuum pump is mounted, the negative pressure for the

Degassing in the membrane tubes or membrane tubes 21 generates. The degassed fluid is removed at a drain 35. As a result, a pressure gradient forms in the housing 10 and a flow from the distribution pipe 31 to the outlet 35 arises. In this case, the part of the membrane module 25 that flows through is relatively narrow. Regions of the membrane module 20 that are outside of this flow path 25 are poorly or not at all traversed. Therefore, not the entire capacity of the membrane module 20 is used with this structure. Furthermore, this is due to the lower flow on the edge of this

Flow path 25 areas in which the solids of the dispersion are deposited. As a result, these regions of the membrane module 20 are blocked by these solids, wherein the pressure in the housing 10 additionally promotes this blocking. This process of blocking can be from a few minutes to several hours, depending on the nature of the dispersion. If the membrane module 20 is blocked, it can no longer be used for degassing and the degassing process must be interrupted. Such a device is therefore not suitable for continuous operation. If the membrane module 20 is not cleaned immediately when blocked, then it can even be permanently damaged.

Fig. 1 b shows schematically the device for degassing 1 of Fig. 1 a in a cross section, wherein the reference numerals have the same meaning as in Fig. 1 a. In this case, the relatively narrow flow-through part of the membrane module 25 can be clearly seen, which extends from the distribution pipe 31 to the outlet 35. The others

Areas of the membrane module 20 are significantly less or not at all flowed through, so that there form the aforementioned deposits of the dispersion. Fig. 2a shows schematically a representation of a device according to the invention for degassing 1 in a longitudinal section. In this embodiment, this is

Membrane module 20 disposed in a container 12 lying. This container is atmospherically open, i. it preferably has an overpressure of 0 to 1 bar, more preferably an overpressure of 0 to 0.5 bar and in particular an overpressure of 0 to 0.1 bar, each based on the atmospheric pressure of the environment on. In particular, substantially the same pressure prevails in the entire container 12.

In another embodiment, the container 12 may also include a lid (not shown) that closes the container 12 upwardly. This cover has above all a protective function, e.g. against contamination from the outside, but he should not substantially increase the pressure of the container 12. If such a pressure increase is unavoidable due to the structural arrangement, then a

Pressure equalization device are mounted, which limits the pressure in the container 12.

In the example shown, the membrane module 20 is completely contained in the degassed fluid 40, which is located in said container 12, and is at a distance 15 below the level of the degassed fluid 40. Via a feed 30, the membrane module 20 with the gas-loaded Fluid supplied. The gas-laden fluid is under an overpressure which, depending on the embodiment, may be approximately between 1 and 12 bar, in particular between 1 and 8 bar, relative to the environment outside of the container 12. As a result, an overpressure forms in the distribution pipe 31. In order to keep the pressure in the distribution pipe 31 as evenly as possible, this can be kept not only cylindrical but also conical or in another form favorable for the uniformity of the pressure; In particular, the distribution pipe 31 can also be designed as a cross-flow distributor. To the distribution pipe 31 are clearly a variety of membrane pipes or

Membrane hoses 21 to see. These are as hydrophobic membrane hollow fibers are formed, which are preferably arranged substantially parallel to the distribution pipe 31 adjacent to the inlet for the fluid 30. These

Membrane hollow fibers are impermeable to liquids but permeable to gases. Therefore, the interior of the hollow membrane fibers is connected to a drain for the gas 37, to which a vacuum pump is connected. With this vacuum pump is preferably a negative pressure of 50 to 800 mbar and

In particular, a negative pressure of 300 to 400 mbar, each based on the atmospheric pressure of the environment applied.

The membrane hollow fibers mentioned can be arranged in a fabric with which the distribution pipe 31 is surrounded. From these hollow membrane fibers, the membrane module 20 is constructed. The hollow membrane fibers are of the

gas-laden fluid, from the distribution pipe 31 to the radial periphery of

Membrane module 20. Since the entire circumference of the membrane module 20 in

Substantially under the same pressure, is formed over the entire radial circumference of the same pressure difference to the distribution pipe 31 from; therefore, the entire membrane module 20 is substantially uniformly flowed through by the fluid, i. the flow-through areas of the membrane module 25 comprise substantially the entire membrane module 20. This results in as

inventive advantage that much larger areas of the membrane module 20 can be used for degassing; This leads to a substantial increase in the flow rate of the membrane module 20. Furthermore, with a

Device according to the invention largely avoided that settle the solids of the dispersion in the membrane module 20 and thereby block the membrane module, for this reason, a device according to the invention can also be used in continuous operation. Only contaminants of the supplied fluid, which could block the membrane module, must be avoided.

Another embodiment of the invention has turbulence generators,

preferably in the form of agitator 50, which hold the degassed fluid in slow motion. This avoids that form in the container 12 outside of the membrane module 20 blockages, the operation of the

Device 1 could interfere. There are, of course, other turbulence generators can be used for this use, such as flow-generating nozzles or the like.

In Fig. 2a, only one membrane module 20 is shown. However, this is not intended to be a limitation of the present invention. Precisely because container 12 can be designed without pressure, scalability of the device, depending on the required flow rate, is relatively easy to accomplish

Device may either have a plurality of membrane modules 20 in a container 12, but it can also be several devices 1 operated in parallel, or a combination of these two embodiments. Fig. 2b shows schematically the degassing device 1 of Fig. 2a in one

Cross-section; the reference numerals have the same meaning as in Fig. 2a. It can clearly be seen how the membrane module 20 is located at a distance 15 below the surface of the degassed fluid. Furthermore, it can be seen how the fluid flows in all directions from the distribution pipe 31 to the radial extent of the membrane module 20, so that the flow-through areas of the

Membrane module 25 include substantially the entire membrane module 20. The flow around membrane tubes or membrane tubes 21 can be seen in a plan view. At the bottom of the container 12, the outlet 35 for the degassed fluid can be seen. The feed 30 of the gas-laden fluid and the withdrawn gas outlet 37 are shown schematically.

Fig. 3 shows schematically a further embodiment of the invention, in which the membrane module 20 is arranged vertically in the non-pressurized container 12; the

Reference numerals have the same meaning as in Fig. 2a and Fig. 2b. Again, it can be seen again that the membrane module 20 is at a distance 15 below the surface of the degassed fluid. The gas-laden fluid supply 30 and the extracted gas outlet 37 are arranged at the top in this embodiment; Alternatively, this can also be done from below. The remaining embodiments according to the invention and extensions, as explained for FIG. 2a, apply here analogously. In one embodiment according to the invention, the construction depth 22 may be so great that the hydrostatic pressure of the fluid causes the fluid in the container 12 outside the membrane module 20 no longer has a uniform pressure. This would lead to different pressure differences over the overall depth 22 of the membrane module 20 without compensation. For this reason, in such an arrangement of the membrane module 20 whose inside - ie the distribution pipe 31 - by influencing the flow, for example by adapted flow barriers, be designed so that the pressure drop of the membrane module 20 between the inside 31 and the radial circumference over the entire Overall depth 22 is substantially constant.

List of reference numbers:

1 device for degassing

10 housing

12 containers

15 levels via membrane module

20 membrane module

21 membrane pipes or membrane hoses

22 Dimensional depth of the membrane module

25 flowed through part of the membrane module

30 supply gas-laden fluid

31 distribution pipe

33 arrows

35 drain degassed fluid

37 drain gas

40 degassed fluid

50 agitator

Claims

claims

Device for degassing a gas-laden fluid, comprising a container (12) in which at least one membrane module (20), with an inner side and a radial circumference, is received for separating a gas from the fluid, wherein the fluid is present to the membrane module (20) over its overall depth centrally fed by means of an inlet (30), discharged via a drain (35) on the container and the gas from the membrane module (20) via another outlet (37) on the membrane module (20) is discharged and the fluid, the membrane module (20) of flows through the inside to the radial extent, characterized in that the fluid in the container (12) outside of the membrane module (20) in

Substantially has a uniform pressure or the pressure differences outside the membrane module (20) are compensated by a pressure equalization in a distribution pipe (31), so that the pressure drop of the

Membrane module (20) between the inside and the radial extent over the entire depth is substantially constant.

Apparatus according to claim 1, characterized in that the fluid in the container (12) outside of the membrane module (20) in

Has substantially atmospheric pressure.

Apparatus according to claim 1 or 2, characterized in that at the outlet (37) for the gas, a negative pressure, preferably a negative pressure of 50 to 800 mbar and in particular a negative pressure of 300 to 400 mbar, each based on the atmospheric pressure of the environment, is created

Device according to one of the preceding claims, characterized in that at the inlet (30) of the fluid, an excess pressure, preferably an excess pressure of 1 to 12 bar and in particular an overpressure of 1 to 8 bar, in each case based on the atmospheric pressure of the environment, is applied.

Device according to one of the preceding claims, characterized in that the membrane module (20) a plurality of membrane tubes or

Membrane hoses (21), in particular hydrophobic membrane hollow fibers, which are produced from at least one material selected from a group which comprises polysiloxanes and / or their derivatives, fluoroelastomers, such as, for example, fluororubber / FKM,

Polytetrafluoroethylene and / or derivatives thereof, polyolefins, and / or derivatives thereof, polyethylene and polypropylene, combinations thereof and

the like.

Apparatus according to claim 5, characterized in that the membrane tubes or membrane tubes (21), in particular also the hydrophobic membrane hollow fibers, are preferably arranged substantially parallel to a distribution tube (31) following the inlet for the fluid (30).

Apparatus according to claim 5 or 6, characterized in that the membrane tubes or membrane tubes (21), in particular also the hydrophobic membrane hollow fibers, are arranged in a fabric.

Device according to one of claims 6 or 7, characterized in that the central distribution pipe (31) is cylindrical or conical, in particular as a cross-flow distributor, designed.

9. Device according to one of claims 6 to 8, characterized in that the membrane tubes or membrane tubes (21), in particular also the hydrophobic membrane hollow fibers, are arranged on a plurality of circular radii, which are arranged substantially coaxially to the distribution tube (31). 10. Device according to one of the preceding claims, characterized in that in the container (12) and outside of the membrane module (20)

Turbulence generators, preferably in the form of a stirrer (50), are arranged.

1 1. Device according to one of the preceding claims, characterized in that the container (12) is executed closed and a

Pressure equalization device comprises.

12. Device according to one of the preceding claims, characterized in that the fluid is a suspension, emulsion or dispersion, as it is preferably used for brushing paper, cardboard or board and further more preferably a solids content between 5 and 75% by weight, preferably between 35 and 70% by weight and in particular between 65 and 70% by weight.

13. Device according to one of the preceding claims, characterized in that the device comprises a plurality of membrane modules (20).

14. A process for degassing a gas-laden fluid, comprising the steps of:

- introducing the gas-laden fluid, in particular a coating color, by means of an overpressure into an inlet (30) of the fluid on an outer surface of membrane tubes (21) of a membrane module (20);

- Applying a negative pressure on the inside of the membrane tubes (21) of the membrane module (20) for discharging (37) of the gas separated from the fluid;

- The fluid flows through the membrane module (20) and the membrane tubes (21) from the inside to the outside;

- Recording the degassed fluid immediately outside the membrane module (20) in a substantially pressure-free container (12);

- Discharge of the degassed fluid via a further outlet (35) on the container

(12).

15. The method according to claim 14, characterized in that the membrane module (20) is substantially a uniform pressure over the radial circumference of the membrane module (20), preferably an overpressure of 0 to 1 bar, more preferably an overpressure of 0 to 0.5 bar and in particular an overpressure of 0 to 0.1 bar, each based on the atmospheric pressure of the environment having.

16. The method according to any one of claims 14 or 15 for degassing a fluid using a device according to one of claims 1 to 13.

17. Use of the device 1 according to claim 1 to 12 for degassing a gas-laden fluid, in particular a suspension, emulsion or

Dispersion consisting at least of water, binder and pigment, as it is preferably used for brushing paper, cardboard or board and further preferably a solids content between 5 and 75 wt. %, preferably between 35 and 70% by weight and in particular between 65 and 70% by weight, or of a coating color for use in curtain coating, roll coating, sump coating or jet coating in paper finishing.