Hydraulically controlled pressure releaf valve for high-pressure reactors

Abstract

A high-pressure reactor which has a hydraulically controlled pressure-relief valve. The mechanical design of the corresponding hydraulic system in combination with the control technology used facilitates particularly fast opening of the pressure-relief valve in the case of pressure or temperature jumps in the high-pressure reactor.

Description

technical field [0001] The invention relates to a plant comprising a high pressure reactor with a hydraulically controlled pressure relief valve. Background technique [0002] Compared with low-pressure and medium-pressure polyethylene, high-pressure polyethylene has a higher degree of branching, lower crystal content, lower melting range and lower density. In autoclaving, ethylene is radically polymerized at a temperature between about 150 and 300° C. and at a pressure in the range of about 1500 to 4000 bar. Oxygen or small amounts of peroxide are usually added as free radical initiators. Corresponding reactors can be designed as turbulent flow tank reactors or, preferably, as flow tubes. Suitable tubular reactors generally have a length of from several hundred to several thousand meters and are surrounded on the outside by a heating or cooling jacket. Due to the very high internal pressure in the reactor, the walls of this tubular reactor, made of metal, are usually abo...

AI Technical Summary

Problems solved by technology

Because the response of the hydraulic control mechanism is relatively slow, the opening speed of the corresponding pressure relief valve is correspondingly low

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