Abstract:
A pressure vessel with an alloyed steel wall and having at least one ring of weldable steel secured thereon and wherein a temperature control jacket associated with said vessel is welded to said ring.
Abstract:
In apparatus for polymerizing high-pressure ethylene to produce polyethylene, a tubular reactor is connected to a source of high pressure ethylene. An intensifier supplies an initiator solution to the tubular reactor. This solution includes one or more catalysts which promote the polymerization reaction. Within the tubular reactor, a peak temperature occurs in proximity of the point at which the catalysts are introduced. If the catalysts are introduced at more than one point, peak temperatures will result downstream of each of such points. For various reasons, the peak temperatures are displaced along the tubular reactor and a plurality of thermocouples are distributed at spaced positions in the tubular reactor to measure the temperatures at the positions at which the peak temperature might occur. These thermocouples generate signals which are fed into a gating arrangement which selects the peak signal which is compared in a comparator circuit with an adjustable or selectable signal representative of the peak temperature which is desired. A difference signal is generated which relates to the difference between the selected signal and the peak signal with which it is compared. This difference signal is converted by a transducer into a pressure signal which is fed to a control valve which controls the speed of operation of a pump feeding the catalysts into the reactor. If two or more pumps are employed for feeding the catalysts into different zones in the reactor, separate controls are provided for each of the pumps.
Abstract:
A PROCESS AND APPARATUS IS DESCRIBED TO MINIMIZE THE DANGER OF AERIAL EXPOLSIONS WHICH OCCUR DURING THE HIGH PRESSURE, HIGH TEMPERATURE POLYMERIZATION OF ETHYLENIC MONOMERS. THE PROCESS INVOLVES RAPIDLY DISCHARGING AT LEAST 0.3 KG. OF WATER PER KG. OF REACTOR CONTENTS INTO THE SAFETY PASSAGEWAY AND OUTLET PIPE WITHIN 10 SECONDS FOLLOWING THE OPERATIVENESS OF SUCH SAFETY PASSAGEWAY BY THE OPENING OF VALVE MEANS WHEN AN EXCESSIVE PRESSURE LEVEL IS REACHED WITHIN THE REACTOR. VARIOUS APPARATUS STRUCTURES ARE ALSO DISCLOSED ADAPTED FOR PRACTICING THIS PROCESS WHEREIN THE WATER IS HELD IN RUPTURABLE BAGS OR, E.G., IS DISCHARGED INTO THE ESCAPING GAS STREAM THROUGH VALVE-OPERATED SPRAY MEANS, OR IN OTHER WAYS.
Abstract:
Apparatus for supporting a plurality of glass-plastic assemblies for lamination in an autoclave comprising bottom edge support structure including aligned bottom edge spacing elements, flexibly interconnected top edge engaging and spacing elements, and structure for making rigid the flexible interconnecting elements on which the top edge engaging and spacing elements are mounted.
Abstract:
A pressure vessel in which a pair of vessel members are attached by means preventing relative rotative movement between the members, and means for preventing relative axial movement between the members.