Transport container for concentrated hydrogen peroxide

Abstract

The transport container for concentrated hydrogen peroxide comprises: a cuboid carrier frame; a liquid container provided inside the carrier frame (1) and frictionally connected thereto, said container having an internal volume of between 65 and 500 l and consisting of pure aluminium, chromium-nickel steel, a nickel-based alloy, or a steel coated with a polyolefin or clad on the inner face; a pressure equalisation device and a pressure relief valve, both of which are provided on the upper face of the liquid container; and at least one sealable opening of the liquid container for the charging and / or removal of hydrogen peroxide.

Description

Technical area

[0001] The invention relates to a transport container for transporting concentrated hydrogen peroxide with a content of more than 60 wt.%. State of the art

[0002] Concentrated hydrogen peroxide is typically transported in pure aluminum cylinders for small quantities, and in tank containers or tank trucks with stainless steel tanks for larger quantities. However, suitable transport containers for the transport of concentrated hydrogen peroxide with a volume range of 65 to 500 liters, which have the necessary transport approval and comply with packaging instruction P501 of the ADR, are not commercially available.International patent application WO 02 / 064454 A2 describes a safety container arrangement for containing hazardous liquids, in particular an organic peroxide, which comprises separate receiving spaces, of which at least one first receiving space serves to contain the hazardous liquid and at least one second receiving space serves to contain another liquid that is miscible with the hazardous liquid to reduce the hazard potential, in particular a liquid for diluting and / or neutralizing the hazardous liquid. At least one connection is provided between the receiving spaces, which is closed by at least one safety mechanism that releases the at least one connection in the event of danger and allows the liquids to mix. Summary of the invention

[0003] The invention relates to a transport container for concentrated hydrogen peroxide, comprising (a) a cuboid support frame (1), (b) a liquid container (2) arranged within the support frame (1) and non-positively connected to the support frame, said container having an internal volume of 65 to 500 l, said container being made of pure aluminum with an aluminum content of at least 99% by weight, of a chromium-nickel steel, of a nickel-based alloy containing molybdenum and chromium, or of a steel coated or lined on the inside with a polyolefin, (c) a pressure equalization device (3) arranged on the top side of the liquid container (2), said pressure equalization device allowing gas to pass between the interior of the container and the atmosphere surrounding the liquid container (2) and allowing pressure equalization at a pressure difference of less than 50 mbar.(d) a pressure relief valve (4) arranged on the top of the liquid container (2) and (e) at least one closable opening (5) of the liquid container (2) for filling with hydrogen peroxide and / or removing hydrogen peroxide. . Short description of the drawings

[0004] Fig. 1 shows a side view of a transport container according to the invention Fig. 2 shows a top view of the transport container of Fig. 1 Description of the invention

[0005] The transport container according to the invention comprises a cuboid-shaped support frame (1) and a liquid container (2) arranged within the support frame (1) and non-positively connected to the support frame.

[0006] The liquid container (2) can be made of pure aluminum with an aluminum content of at least 99 wt.%. Preferably, pure aluminum with an aluminum content of at least 99.5 wt.% is used. A liquid container made of pure aluminum is preferably pretreated for the transport of hydrogen peroxide by an etching process that removes metal from the inner wall of the container. An alkaline pretreatment followed by a subsequent treatment with a mixture containing phosphoric acid, hydrofluoric acid, and hydrogen peroxide is particularly preferred.

[0007] The liquid container (2) can alternatively be made of a chromium-nickel steel. Austenitic chromium-nickel steels are preferred, in particular chromium-nickel steels with material numbers 1.4401 and 1.4571 according to EN 10027-2:1992. A liquid container made of chromium-nickel steel is preferably pretreated oxidatively for the transport of hydrogen peroxide. Pretreatment with a mixture containing nitric acid and hydrofluoric acid is particularly preferred.

[0008] In a third alternative, the liquid container (2) can be made of a nickel-based alloy containing molybdenum and chromium. Suitable base alloys are available under the brand name Hastelloy C.

[0009] In a fourth alternative, the liquid container (2) can be made of steel coated or lined on the inside with a polyolefin. A container made of chromium-nickel steel with a polyolefin coating adhering to the entire inner surface of the container is preferred. The polyolefin is preferably a fluorinated polyolefin, particularly preferably polytetrafluoroethylene (PTFE), polyvinylidene difluoride (PVDF), or a tetrafluoroethylene-perfluoroalkoxyvinyl ether copolymer (PFA).

[0010] The liquid container (2) is preferably made of pure aluminum, since after cleaning the container, hydrogen peroxide solutions with a low content of peroxide stabilizer can also be safely transported in the container.

[0011] The liquid container (2) has an internal volume of 65 to 500 l, preferably of 65 to 250 l. The liquid container preferably has a cylindrical shape, particularly preferably the shape of an upright cylinder (6) with a curved base (7) and lid (8). The base (7) and lid (8) are preferably welded to the cylinder (6). The wall thickness of the liquid container is preferably selected such that the liquid container can withstand a pressure difference between the interior of the container and the atmosphere surrounding the container of at least 2.5 bar, preferably at least 1.5 bar, as well as a drop of the transport container from a height of 2 m.

[0012] A pressure equalization device (3) and a pressure relief valve (4) are arranged on the top of the liquid container (2).

[0013] According to the invention, any device that allows gas to pass between the interior of the container and the atmosphere surrounding the liquid container, and thus pressure equalization at a pressure difference of less than 50 mbar, is suitable as a pressure equalization device (3). The pressure equalization device (3) is preferably designed such that pressure equalization occurs both at an overpressure and at a negative pressure in the container, preferably at a pressure difference of less than 30 mbar, particularly preferably less than 10 mbar. The pressure equalization device (3) is most preferably designed such that it has a free gas passage, even when there is no pressure difference between the interior of the container and the atmosphere surrounding the liquid container.The pressure equalization device (3) preferably comprises a particle filter to prevent solid particles from the ambient air from entering the liquid container (2) during pressure equalization, which could cause decomposition of hydrogen peroxide in the liquid container (2). The particle filter is preferably made of a flame-retardant material and is preferably a sintered filter made of metal, glass, ceramic, or a hydrophobic polymer, preferably a fluorinated polymer and particularly preferably PTFE. Alternatively, or in combination with a sintered filter, a filter fleece or filter fabric made of a hydrophobic polymer, preferably a fluorinated polymer and particularly preferably PTFE, can also be used.

[0014] The pressure equalization device (3) can additionally comprise a device that closes the pressure equalization device when liquid enters the pressure equalization device from the container side, in order to prevent liquid from leaking from the pressure equalization device if the transport container (1) tips over. Alternatively, a filter made of a hydrophobic polymer, e.g., PTFE, with a small pore size can be used for the same purpose, in which a differential pressure of more than 200 mbar is required for the passage of liquid hydrogen peroxide through the filter material.

[0015] Suitable pressure equalization devices (3) are known from storage tanks for hydrogen peroxide and larger transport tanks for hydrogen peroxide and are commercially available, e.g. from the company PEROLO under the name "H2O2 Breather".

[0016] A pressure relief valve (4) within the meaning of the invention is a valve that only allows gas to pass through at a certain overpressure of more than 0.1 bar inside the container and remains closed at a lower pressure difference or underpressure in the liquid container. The pressure relief valve (4) is preferably designed such that it opens when a limit value for the overpressure in the liquid container (2) relative to the surrounding atmosphere in the range of 0.1 to 2.5 bar is exceeded, particularly preferably from 0.5 to 2 bar, in particular 1.5 bar. The pressure relief valve (4) is preferably designed such that it closes again automatically when the limit value for the overpressure is undershot. Preference is given to pressure relief valves (4) that open and close by a spring mechanism that is moved by the overpressure in the liquid container (2) and does not require any auxiliary energy.The pressure relief valve (4) is preferably designed such that, when open, it provides a passage opening with a cross-section of at least 3 cm², preferably from 4 to 200 cm². The pressure relief valve (4) allows the oxygen and water vapor formed during rapid decomposition of hydrogen peroxide in the liquid container (2) to escape and prevents a pressure increase in the liquid container to pressures that could lead to the container bursting. Suitable pressure relief valves (4) are known from hydrogen peroxide storage tanks and larger hydrogen peroxide transport tanks and are commercially available, e.g., from PEROLO under the designation "YAK VX safety relief valve."

[0017] The liquid container (2) also has at least one closable opening (5) for filling with hydrogen peroxide and / or removing hydrogen peroxide. The closable opening (5) is preferably arranged on top of the liquid container (2) and is preferably closed with a lid, which preferably closes gas-tight. The lid can be fastened over the opening, for example, by screwing or with a clamping ring. The closable opening is preferably designed with a flange to which a fitting closing the opening for removing hydrogen peroxide can be attached. Such a fitting preferably comprises a dip tube that reaches almost to the bottom of the liquid container (2) and through which hydrogen peroxide can be pumped out of the transport container (19).As an alternative to a closable opening (5) on the top side of the liquid container (2), or in addition to such an opening, the liquid container (2) can also have a closable opening (5) arranged on the bottom side, which can be closed by a shut-off valve. The shut-off valve can be designed as a stopcock or a valve.

[0018] The liquid container (2) of the transport container according to the invention is arranged within a cuboid-shaped support frame (1) and is non-positively connected to the support frame (1). The non-positive connection between the support frame (1) and the liquid container (2) can be established via tabs on the liquid container (2) that are screwed to the support frame (1), or preferably via clamping devices that are attached to the support frame (1) and into which the liquid container (2) is clamped. The liquid container (2) can be connected to the support frame (1) via one or more shock absorbers.

[0019] In a preferred embodiment, the liquid container (2) has the shape of an upright cylinder (6) with a curved base (7) and lid (8), and a circumferential ring (10) is attached to the lower end of the liquid container, preferably by welding to the liquid container (2). In this embodiment, the support frame comprises a base (9) on which the circumferential ring (10) of the liquid container (2) rests. The base (9) of the support frame can be continuous or grid-shaped. Alternatively, the base of the support frame can also be circumferential with a central opening below the liquid container (2).The design with a circumferential ring (10) resting on the base (9) allows the weight of the liquid container (2) to be evenly distributed across the circumferential ring (10) onto the support frame, preventing any point loading of the liquid container (2) due to the weight. In this embodiment, the liquid container (2) is preferably connected to the support frame (1) by a force-locking clamping ring (11) placed around the cylinder (6), which also prevents any point loading of the liquid container (2).The embodiment with a clamping ring (11) placed around the cylinder (6) has the advantage that the liquid container (2) can be easily installed in the support frame (1) by inserting the liquid container (2) into the support frame (1) from above with the clamping ring (11) open until the circumferential ring (10) rests on the base (9) of the support frame and then the liquid container (2) is non-positively connected to the support frame (1) by closing the clamping ring (11). The circumferential ring (10) of the liquid container (2) can have additional tabs on its lower edge with which it can be non-positively connected to the base (9) of the support frame in order to prevent the liquid container (2) from slipping on the base (9).

[0020] The support frame (1) preferably comprises metal profiles (12) on the edges of the cuboid-shaped support frame, preferably made of steel, particularly preferably of galvanized steel or stainless steel, which preferably have an L-shaped cross-section or are hollow profiles with a square, rectangular, round, or oval cross-section and impart mechanical strength to the support frame (1). If the support frame (1) has a base (9), the metal profiles (12) are preferably attached to this base and form the edges of the cuboid located above the base.

[0021] The support frame (1) preferably has receptacles (13) on its underside for the forks of a forklift to prevent the transport container from falling during transport with a forklift. If the support frame (1) comprises a base (9), the receptacles (13) are preferably arranged below this base to prevent damage to the liquid container (2) when using a forklift.

[0022] The support frame (1) preferably has grid-shaped or closed side walls to prevent damage to the liquid container (2), the pressure equalization device (3), and the pressure relief valve (4) during transport. For the same purpose, the support frame (1) preferably additionally comprises a grid-shaped or continuous cover (14) that can be opened and locked in the closed state. The side walls of the support frame (1) preferably have a surface for attaching an information panel, particularly preferably a surface with a lockable door to protect the information panel.

[0023] The support frame (1) can also have lifting eyes (15) on the top for lifting the transport container, which enable easy and safe loading of the transport container with a crane.

[0024] The cuboid support frame (1) of the transport container according to the invention can also have receptacles on the bottom or on a metal profile at a lower edge for a fastening device with which it can be secured to the loading area of ​​a vehicle, for example, a truck or a railway wagon. The locking can be achieved, for example, by claws or bolts that engage in the receptacles, or by straps that are guided through the receptacles and then tightened.

[0025] Fig. 1 shows a preferred embodiment of the transport container according to the invention in side view, Fig. 2 The same container seen from above. The transport container comprises a cuboid support frame (1) and, arranged therein, a liquid container (2), which has the shape of an upright cylinder (6) with a curved base (7) and lid (8), and has a circumferential ring (10) with which it stands on the base (9) of the support frame (1). The liquid container (2) is force-fittingly connected to the support frame (1) by a clamping ring (11) placed around the cylinder (6). Arranged on the top side of the liquid container (2) are a pressure equalization device (3), a pressure relief valve (4), and an opening (5) that can be closed with a lid for filling with hydrogen peroxide and for removing hydrogen peroxide. The cuboid support frame (1) has metal profiles (12) with an L-shaped cross-section that are fastened to the base (9), which form the edges of the cuboid located above the base (9).The support frame (1) also has a lid (14) that can be locked, as well as lifting eyes (15) for lifting the transport container and receptacles (13) for the forks of a forklift truck below the base (9). The grid-shaped side walls of the support frame (1) and the grid shape of the lid (15) are shown in . Fig. 1 und 2 not shown to improve the clarity of the presentation. List of reference symbols:

[0026] 1Cuboid support frame 2Liquid container made of pure aluminum 3Pressure equalization device 4Pressure relief valve 5Opening for filling with hydrogen peroxide and / or removing hydrogen peroxide 6Upright cylinder of the liquid container 7Convex bottom of the liquid container 8Convex lid of the liquid container 9Bottom of the support frame 10Circumferential ring on the liquid container 11Clamping ring 12Metal profiles of the support frame 13Receptacles for the forks of a forklift 14Cover of the support frame 15Carrying eyes of the support frame

Claims

1. Transport container for concentrated hydrogen peroxide, comprising • a cuboidal retaining frame (1), • a liquid container (2) disposed within the retaining frame (1) and frictionally connected to the retaining frame, consisting of pure aluminium with an aluminium content of at least 99 wt%, of a chromium-nickel steel, of a nickel-base alloy containing molybdenum and chromium, or of a steel lined or coated with a polyolefin on the inside, • at least one closable opening (5) of the liquid container (2) for charging with hydrogen peroxide and / or removal of hydrogen peroxide, characterized by likewise comprising: • a pressure equalization device (3) disposed on the top face of the liquid container (2), which enables the passage of gas between the container interior and the atmosphere surrounding the liquid container (2) and enables pressure equalization in the case of a pressure difference of less than 50 mbar, • a pressure relief valve (4) disposed on the top face of the liquid container (2), and • the liquid container (2) has an internal volume of 65 to 500 l.

2. Transport container according to Claim 1, characterized in that the liquid container (2) has the form of a vertical cylinder (6) with domed base (7) and lid (8).

3. Transport container according to Claim 2, characterized in that the retaining frame (1) comprises a base (9) and at the bottom end of the liquid container (2) a circumferential ring (10) is mounted which stands up on the base (9) of the retaining frame (1).

4. Transport container according to Claim 3, characterized in that the liquid container (2) is connected frictionally to the retaining frame (1) by a clamping ring (11) placed around the cylinder (6).

5. Transport container according to Claim 3 or 4, characterized in that the retaining frame (1) comprises metal profiles (12) mounted on the base (9) and made preferably of steel, which form the edges of the cuboid located above the base (9).

6. Transport container according to Claim 5, characterized in that the metal profiles (12) have an L-shaped cross section or are hollow profiles with a square, rectangular, round or oval cross section.

7. Transport container according to any of Claims 1 to 6, characterized in that the liquid container has an internal volume of 65 to 250 l.

8. Transport container according to any of Claims 1 to 7, characterized in that the liquid container (2) consists of pure aluminium with an aluminium content of at least 99.5 wt%.

9. Transport container according to any of Claims 1 to 7, characterized in that the liquid container (2) consists of a steel lined or coated with a fluorinated polyolefin on the inside, the fluorinated polyolefin being selected from polytetrafluoroethylene (PTFE), polyvinylidene difluoride (PVDF) and tetrafluorethylene-perfluoroalkoxyvinyl ether copolymer (PFA).

10. Transport container according to any of Claims 1 to 9, characterized in that the liquid container (2) is connected to the retaining frame (1) via at least one shock absorber.

11. Transport container according to any of Claims 1 to 10, characterized in that the retaining frame (1) has receivers (13) on the bottom side for the forks of a forklift truck.

12. Transport container according to any of Claims 1 to 11, characterized in that the retaining frame (1) comprises latticed or closed side walls.

13. Transport container according to Claim 12, characterized in that the retaining frame (1) additionally comprises a latticed or continuous lid (14) which can be opened and which in the closed state can be locked.

14. Transport container according to any of Claims 1 to 13, characterized in that the retaining frame (1) has carrying eyelets (15) on the top face for lifting of the transport container.

15. Transport container according to any of Claims 1 to 14, characterized in that the pressure relief valve (4) opens when a limiting value for an overpressure in the liquid container (2) relative to the surrounding atmosphere in the range from 0.1 to 2.5 bar is exceeded.

16. Transport container according to Claim 15, characterized in that the pressure relief valve (4) closes again automatically when the value for the overpressure falls below the limiting value.

17. Transport container according to any of Claims 1 to 16, characterized in that the pressure equalization device (3) comprises a particle filter.

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