Reduction of the emission of hydrocarbons in pressure-reduction

Details Reduction of the emission of hydrocarbons in pressure-reduction Reduction of the emission of hydrocarbons in pressure-reduction

1987-12-03

1989-02-14

Smith, Edward J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Removing and recycling removed material from an ongoing...

422 17, 422131, 526352, 5263522, 526 64, G05B 900, C08F 234

Patent

active

048047252

ABSTRACT:
The pressure in a continuous high pressure polymerization system, in which ethylene, with or without comonomers, is polymerized under high pressures and temperatures and the unconverted amounts of gas are recycled through the high pressure recycle gas system into the polymerization system, is rapidly reduced to below the particular reaction pressure when predetermined limiting pressure and/or temperature values are exceeded or when other faults occur by opening one or more pressure-relief apparatuses mounted on the high pressure polymerization system and transferring the hot let-down reaction mixture from the polymerization system via one or more let-down lines through one or more separator systems into the atmosphere, by a process in which the high pressure polymerization system is divided into a plurality of isolated sections at the same time as the let-down process is triggered and only the section in which the let-down process is triggered is let down to the atmosphere. Preferably, the sections in which the let-down process is not triggered can be let down into the high pressure recycle gas system, if necessary through a product separator, in synchronization with triggering of the let-down to the atmosphere.

REFERENCES:
patent: 3781256 (1973-12-01), Sadee et al.
patent: 4115638 (1978-09-01), Becker et al.
patent: 4153774 (1979-05-01), Boettcher et al.
patent: 4424319 (1984-01-01), Durand et al.
patent: 4627962 (1986-12-01), Grasset et al.
patent: 4690800 (1987-09-01), Nardi et al.

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