Abstract:
A container for thermal conditioning of a fluid under pressure, use of the container for thermally conditioning a fluid under pressure, a chemical reactor including the container and a polymerization process using the reactor, and a method of producing the container and the reactor. The container is bounded over at least part of its surface facing the outside by at least one external plate and facing the inside by at least one internal plate, the external plate being thicker than the internal plate, the external plate and the internal plate being joined together in places to define a space between joints for circulation of a heat-transfer fluid and the container including a mechanism to adjust the pressure of the heat-transfer fluid to that of the fluid under pressure.
Abstract:
The disclosed isostat for treating materials comprises a hermetic container connected to a gas supply means, an induction heater and an open-top working chamber that are arranged therein, the chamber being mounted above the heater and designed for placing the article to be treated and the working medium therein. The working chamber is made in the form of a vessel with double walls and a bottom therebetween, the inner wall of the vessel defines a reaction chamber, the bottom of which is located above the heater higher than the bottom between the walls of the vessel, the bottom between the walls is located lower than the exposure zone of the heater, and the isostat is provided with a heat-insulating chamber, the wall of which is located in the space between the walls of the vessel with a gap between the open lower butt of the heat-insulating chamber and the bottom between the walls of the vessel, and with a gap between the closed butt thereof and the upper open butt of the reaction chamber.
Abstract:
The disclosed isostat for treating materials comprises a hermetic container connected to a gas supply means, an induction heater and an open-top working chamber that are arranged therein, the chamber being mounted above the heater and designed for placing the article to be treated and the working medium therein. The working chamber is made in the form of a vessel with double walls and a bottom therebetween, the inner wall of the vessel defines a reaction chamber, the bottom of which is located above the heater higher than the bottom between the walls of the vessel, the bottom between the walls is located lower than the exposure zone of the heater, and the isostat is provided with a heat-insulating chamber, the wall of which is located in the space between the walls of the vessel with a gap between the open lower butt of the heat-insulating chamber and the bottom between the walls of the vessel, and with a gap between the closed butt thereof and the upper open butt of the reaction chamber.
Abstract:
A self sealing vessel assembly for high pressure microwave assisted chemistry is disclosed. The vessel assembly includes a polymeric cylinder and a circular polymeric cap for the cylinder, the cylinder being closed at one end and open at the other end to receive the cap. The open end of the cylinder has a lip that is beveled inwardly from the open end, and the circular polymeric cap has a beveled lower edge that engages the beveled lip when the cap is place upon the polymericcylinder. For high pressure applications, a choke cylinder depends from the beveled lower edge of the cap, and has an outer diameter substantially the same as the inner diameter of the polymeric cylinder so that the choke provides a self sealing mechanism for the cylinder as pressure from a chemical reaction increases within the cylinder. A composite sleeve surrounds the polymeric cylinder, and includes at least one wound fabric layer in which the winding is selected from the group consisting of filaments and yarns. A supporting frame extends along the cylinder and across the lid and across the closed end of the cylinder, and prevents the lid from being displaced from the cylinder when pressure is generated inside of the vessel.
Abstract:
A high-pressure and a method for high-pressure treatment of substances. The high-pressure press comprises a high-pressure cylinder consisting of a number of concentrically arranged cylinder elements (1, 2, 3). The cylinder elements (1, 2, 3) are radially prestressed to a predetermined prestress and surround a high-pressure chamber (6) for accommodating a pressurized medium. A thin safety liner (3), which is intended to be placed in the high-pressure cylinder until a fracture arises on the safety liner (3), is arranged in the interior of the high-pressure cylinder. Further, means (14, 15) are provided to conduct at least part of the pressurized medium from the high-pressure chamber (6) when a fracture arises on the safety liner (3). The means (14, 15) comprise at least one channel (14) running essentially along the outer envelope surface of the safety liner (3). The method comprises using the high-pressure press without liner replacement until a fracture has occurred on the thin safety liner.
Abstract:
Containers for materials which are to be microwave heated such as in digesting or extracting operations, are made of thermoplastic material, such as a fluoropolymer, e.g., TEFLON.RTM. PFA, that is strengthened by reinforcing means that may be a fiber reinforced thermoplastic of high tensile strength, such as polyetherimide, e.g., ULTEM.RTM., with reinforcing continuous fibers in a matrix of such thermoplastic, which fibers are preferably of glass or other heat resistant and microwave transmissive material. The containers may be strengthened by incorporating the fiber reinforced thermoplastic in a wall or walls of the container or by inserting the container into a reinforcement, which is a sleeve or collar of the reinforced thermoplastic. In both such constructions the reinforcing means protects the container against peripheral or radial failure due to pressure that is generated by the microwave heating of the container contents. Also described are processes for manufacturing the described reinforcing means and for utilizing containers protected by such means.
Abstract:
A device for helical coiling of pressure vessel shells comprises a frame (4) traversable along the axis of a pressure vessel shell (1). The bottom portion of the frame (4) mounts a pressing mechanism 5 vertically traversable along the radius of the pressure vessel shell. A mechanism (6) for tensioning the steel strip being coiled is located before the pressing mechanism (5) as along the direction of run of the steel strip (13) from a coil (9) towards the pressure vessel shell (1). The pressing mechanism (5) has a beam (23) secured on the frame (4) and provided with forks (21) and rollers (20), both facing the pressure vessel shell. Each of the rollers (20) is mounted in its own fork (21) and spaced apart from another roller a distance 10 to 50 times the thickness of the steel strip (13) being coiled, and is situated on the generatrix of the pressure vessel shell (1) across the entire width of the steel strip (13) being coiled. The steel strip tensioning mechanism (6) is made as a group of rolls (16) of which the extreme two rolls (18, 19), as in the direction of run of the steel strip, have a convex and a concave camber, respectively, facing the surface of the steel strip (13). The radius of curvature of said cambered roll surfaces is determined by the thickness and mechanical characteristics of the steel strip (13) being coiled and by the amount of plastic deformation required to compensate for the marginal effect tending the edges of the steel strip (13) to flange outwards when the strip is being coiled onto the pressure vessel shell (1) past the pressing mechanism (5).
Abstract:
A pressure tank for hot fluids or agents, with the metallic wall thereof having interspaces and an inner layer with a plurality of layers placed therearound. The interspaces are arranged behind, that is, outwardly of, the inner layer, or between two layers. At least in the hottest region of the tank, the interspaces occupy at least 1/15, preferably 1/10 to 1/2, of the volume of the entire wall, and are filled with a thermally insulating solid medium.
Abstract:
Disclosed is an elongated cylindrical furnace that includes a housing which defines an internal pressure chamber. An annular heater is disposed in the chamber in surrounding relationship to a centrally disposed material treatment space and an insulation layer is disposed in surrounding relationship to the heater. An annular gas impermeable wall is disposed in the chamber between the heater and the treatment space to isolate the latter from the space outside the wall where the heater is located. The outer heater space and the inner material treatment space are each provided with a respective source of pressurized gas for pressurization of the furnace to operating pressure. Thus, the amount of pressurized gas in contact with the material undergoing treatment is minimized and limited by the volume of the inner space and contact between gas from the inner space which may have become contaminated by contact with the material undergoing treatment and hard to clean furnace components in the outer space is limited by the presence of the wall. Also disclosed are various means for controlling the relative gas pressures in the inner and outer spaces.
Abstract:
The invention relates to means for establishing an equalized pressure across the insulating sheath of a hot isostatic press system. Tubes are positioned in the outer, insulation portion of the sheath to provide a substantially resistance free passage between a source of high pressure gas input to the system and the upper portions of the sheath. The invention also tends to reduce convection currents in the furnace chamber.