JP2010500253A - Vent cover and container with such vent cover - Google Patents

Abstract

A pressure release container for a peroxide substance, for example, comprising a discharge port (2), a neck (3) along the periphery of the discharge port and a vent cover (5). The vent cover comprises a body plate (6) that covers the outlet, the body plate having a vent (7) and for cooperating with corresponding fastening means on the outer surface of the neck. For example, a flange (9) having a thread (4). The vent is covered with a gas permeable sheet (11) fixed between the neck and the fastening means of the flange. The vent may comprise a pop-off cap (8).
[Selection] Figure 1

Description

  The present invention is a pressure release container comprising a discharge port, a neck portion around the discharge port, and a vent cover provided with a main body plate covering the discharge port. And a flange having an inner peripheral surface with clamping means for cooperating with corresponding clamping means on the outer surface of the neck Relates to a container covered with a gas permeable filter.

  Such containers can typically be used for compositions that are susceptible to exothermic decomposition. Due to this slow decomposition with the release of gas that can create dangerous overpressure in the container over time, such compositions cannot be placed in sealed containers. Such materials include peroxide compositions, which are optionally dissolved in so-called desensitizers (typically hydrocarbon solvents) or in aqueous solutions, emulsions or suspensions. Typical examples of such peroxides are hydrogen peroxide or inorganic peroxides such as aqueous solutions of monoperoxysulfuric acid or liquid organic peroxides. All these peroxides generate insignificant amounts of gases such as oxygen. In order to avoid dangerous overpressure in the sealed state of such products, these containers are equipped with porous filters that are gas permeable and do not leak into liquids. As it passes through the filter, gas is released from one or more holes in the closure cap.

  U.S. Pat. No. 4,853,013 discloses a vent coating with a filter structure for containers containing hazardous materials, such as liquid organic peroxides. It includes a cap and filter structure. In normal operation, gas evaporated from the liquid in the container passes through the entire filter structure and escapes through the venting means. The filter structure includes two filters that are permeable to gas and impermeable to liquid. Such a ventilation system has a rather complex structure and is therefore expensive to manufacture.

  Australian Patent No. 9341259 describes a cap in the form of a cap with a pore closed by a porous PTFE membrane in intimate contact with a layer of porous foamed polyethylene, for example for storage and transport of organic peroxides. A pressure vent is disclosed.

  A PTFE filter in a screw-type cap vent cover is disclosed in European Patent Application No. 0759401A.

  It is an object of the present invention to provide a simple configuration venting system that is particularly suitable for storing peroxide compositions or other materials that are susceptible to exothermic decomposition.

  An object of the present invention is the container described in the first section of the specification, characterized in that the gas permeable filter is a sheet secured between the neck and flange fastening means. Achieved by: This provides a ventilation arrangement that is easily assembled and that is very efficient and low cost.

  The sheet can be, for example, a plastic material, such as a foil of low density or high density polyethylene (LDPE, HDPE), polyvinyl chloride, polypropylene or the like. The thickness of the sheet can be, for example, between about 5 micrometers and about 0.5 mm, such as between about 10 micrometers and about 0.1 mm.

  In order to make the sheet permeable to gas, the sheet can be perforated, for example. The inner diameter of the pores of the hole can be, for example, between about 10 micrometers and about 2 mm, such as between about 0.1 mm and about 1.5 mm.

  In order to prevent the content from flowing out, the permeable sheet can be made of, for example, a perforated sheet having two or more layers. Preferably, they are provided such that holes in one layer do not coincide with holes in the other layer.

  The vent cover may be a threaded cap, for example. For this purpose, the clamping means described above can be formed by outer threads on the outer side of the outlet neck and corresponding inner threads on the flange of the vent cover. Other clamping means such as snap connections or clamp connections can also be used.

  Optionally, the vent in the vent cover may include a pop-off cap. For this purpose, the vent is surrounded by a neck that fits inside the peripheral flange of the pop-off cap so that the mutually facing sides of the neck and flange form a releasable snap joint. With a clear outline.

  This profile can include cooperating beads and recesses commonly used in the field of snap bonding technology. This is achieved by selecting a material with the appropriate flexibility and optimizing the dimensions of the beads and recesses, with a certain overpressure, for example a pressure in the range of 0.1-0.5 bar or higher. Allows snap joint dimensions to be removed.

  The vent cover may have a diameter of, for example, 10-30 cm, for example about 15 cm. The pop-off cap can have a diameter of, for example, 5 cm to 12 cm, for example about 7 cm. However, other dimensions may be used as required for the vent cover and / or pop-off cap (if present).

Fig. 2 shows a partial cross-sectional view of a vent covering of a container according to the invention. FIG. 2 shows a side view of the container of FIG.

  The container of the present invention is particularly suitable for storage and / or transportation of desensitizers or exothermic degradable compositions, particularly peroxide compositions, optionally dissolved in an aqueous solution, emulsion or suspension. Is suitable. Generally, such containers can have a volume of 600-1400 liters, for example about 1000 liters. However, if required, the volume may be more or less.

  The vent cover of the present invention can be mounted on any type of container known in the art. The containers can also be made from various types of materials, such as metal containers, wooden containers and composite or plastic containers.

  In one embodiment of the present invention, the vent cover is attached to a container equipped with a special spring-loaded clamping string for sealing by a lid. The tightening string releases the lid at a pressure level above the atmospheric pressure in the container. Such containers are generally used for transport and / or storage of compounds or compositions that are prone to exothermic degradation. The present invention has the advantage of allowing leakproof transport and / or storage of peroxide and preventing cracking or crushing of the container. An example of this embodiment is disclosed in WO 95/26911.

  In another embodiment, the vent cover is attached to a container with at least one rupture region located above the liquid level in the container when the container is filled with such liquid. It is done. Rupture area is defined as the relatively weak part of the container where excessive pressure builds up inside the container before the wall containing the top and bottom of the container will rupture before the rupture area ruptures. . The rupture region can be made of a material that is weaker than the surrounding material of the rupture region, or it can be the same material but relatively weaker than the surrounding material. In one embodiment, the rupture zone is made thinner than its surroundings. The rupture region can take any shape and size as long as it is provided above the liquid level of the liquid contained or to be contained in the container. In one embodiment, the rupture zone is the top surface itself, which is made at least partially thinner than the bottom and side walls.

  In one embodiment, the container is provided with a vent coating on top of the plastic inner container, the container being placed on a pallet and surrounded by a metal frame. The plastic inner container structure is such that at least a portion of the top surface of the container is thinner than the bottom and side walls. The bottom and side walls of the plastic inner container are secured by a bottom structure adapted to the size of the metal frame and pallet, while the top surface is made less secure by the metal frame. At some level above the atmospheric pressure in the container, the vent cover is first opened. If the pressure rises further, the weaker top structure of the container will tear in a controlled manner. In this way, sufficient vents are made to escape all gaseous decomposition products and there will be no crushing or explosive rupture of the composite container, so that the liquid composition in the container Allow to leave things. In this embodiment, these composite containers would in principle be suitable for the transport of several classes of liquid organic peroxide compositions and, although not preferred, other substances mentioned in this patent application.

  Regardless of the vent coating, the use of a container with at least one rupture zone as described above is also contemplated. As one embodiment, the present invention relates to a container for storing a liquid composition that easily undergoes exothermic decomposition, and includes at least one rupture region above the liquid surface of the liquid composition. The container can be made of any material known in the art for such containers. Preferably, the container is made of a polymeric material such as polyethylene, such as high density polyethylene (HDPE), polypropylene and polyvinyl chloride. The polymeric material may further include additives that can conduct electricity and reduce any electrostatic energy on or near the container.

  In a preferred embodiment, the rupture zone is made of the same material used for the container. These rupture zones are preferably thinner than the material of the container wall.

  These containers may be provided with any vent coating known in the art, including the vent coating described above. The present invention also allows for no vent cover.

  The rupture zone provides a container that can be made of a material that is not normally used for storage and / or transportation of a safer and more pyrogenic liquid composition, such as a liquid peroxide composition.

  The invention is further illustrated by the drawings.

  FIG. 1 shows a portion of a container 1 with a discharge port 2 having a peripheral neck 3 provided with outer threads 4. The vent hole cover 5 includes a main body plate 6 that covers the discharge port 2. The main body plate 6 of the vent hole cover 5 has a vent hole 7 covered with a pop-off cap 8. Along the periphery of the body plate 6, the vent cover 5 has a flange 9 with an inner thread 10 that cooperates with the outer thread 4 of the outlet neck 3. A gas permeable sheet filter 11 of perforated plastic foil material covers the discharge port 2 and is fixed between the screw connections 3 and 4 and between the discharge port neck 3 and the vent hole covering flange 9.

  The pop-off cap 8 includes a cap body 12 having a peripheral cap flange 13 that covers a neck 14 surrounding the vent 7. The neck 14 is provided with ridges or beads 15 on the outside thereof. The inside of the cap flange 13 is provided with ridges or beads 16 that fasten through the cervical ridges 15 to form a releasable snap joint. The dimensions of the ridges 15, 16 and the elastic properties of the selected material are selected such that the cap 8 pops off at some predetermined overpressure.

  FIG. 2A is a side view of the container 1, which can be placed on a pallet 17 with a support cage 18 of iron lattice structure as shown in FIG. 2B. The container 1 has a discharge port 19 on its lower side. The discharge port cover 5 shown in FIG. The container 1 can have a volume of about 1000 liters.

Claims (7)

  A container comprising a discharge port, a neck portion around the discharge port, and a vent cover provided with a main body plate covering the discharge port, wherein the main body plate has a vent hole and the neck portion A flange having an inner peripheral surface provided with clamping means for cooperating with corresponding clamping means on the outer surface is disposed along the periphery of the body plate, and the vent is covered with a gas permeable filter. The container is characterized in that the gas permeable filter is a sheet fixed between the fastening means of the neck and the flange.   The container according to claim 1, wherein the vent in the vent coating is provided with a pop-off cap.   The container according to claim 1 or 2, wherein the sheet is a foil having holes made of a plastic material.   4. The tightening means is formed by an outer thread on the outer surface of the outlet neck and a corresponding inner thread on the vent covering flange. The container according to item.   The permeable sheet is made of a sheet layer having two or more holes, and the holes of the sheet layer are not positioned to overlap each other. Container as described.   The container according to any one of claims 1 to 5, further comprising at least one rupture region provided above the liquid level of the liquid composition contained or to be contained in the container.   7. A composition as claimed in claim 1 for storage and / or transport of compositions which are susceptible to exothermic decomposition, such as desensitizers or peroxide compositions optionally dissolved in aqueous solutions, emulsions or suspensions. A method of using the container according to item 1.

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