Basell Polyolefine Gmbh

Basf Aktiengesellschaft

Georg Groos

Dieter Littmann

Andre-Armand Finette

Christoph Wolf

Michael Deuerling

Danir Khayrullin

Sven Wolfram

Giulia Mei

Jürgen Peter Mohrbutter

Andreas Deckers

Wilhelm Weber

Andreas Daiss

Klaus Hammer

Kaspar Evertz

Andrei Gonioukh

Gernot Koehler

Frank-Olaf Mähling

Claudio Fibla

Thomas Herrmann

Juergen Mohrbutter

Erich Neumann

Frank-Olaf M&auml;hling

Frank Olaf Maehling

Andreas W&ouml;lfert

Michael Stenger

Jürgen Mohrbutter

The present disclosure relates to a plant for performing polymerization, such as the polymerization of ethylene, having a recycle connection with two or more cooling channels arranged in parallel, a process for polymerization and downstream processes, and a plant for polymerization, comprising the following plant components in fluid communication:

Polymerization plant having parallel cooling channels in a recycle connection

A process for separating polymeric and gaseous components of a polymer-monomer mixture at a pressure of from 0.12 MPa to 0.6 MPa and a temperature of from 120&#xb0; C. to 300&#xb0; C. in a separation vessel is provided. The separation vessel has a vertically arranged cylindrical shape with a ratio of length to diameter L/D of from 0.6 to 10 and an inlet pipe capable of introducing the polymer-monomer mixture into the separation vessel which the inlet pipe extends vertically from the top of the separation vessel into the separation vessel. Further a process for preparing ethylene homopolymers or copolymers from ethylenically unsaturated monomers in the presence of free-radical polymerization initiators at temperatures from 100&#xb0; C. to 350&#xb0; C. and pressures in the range of from 110 MPa to 500 MPa comprising such a process for separating a polymer-monomer mixture is provided.

Process for separating components of a polymer-monomer mixture obtained by high-pressure polymerization of ethylenically unsaturated monomers

The present technology relates to a process for polymerizing or copolymerizing ethylenically unsaturated monomers in the presence of free-radical polymerization initiators, wherein the polymerization is carried out in a continuously operated tubular reactor at temperatures from 100&#xb0; C. to 350&#xb0; C. and pressures from 180 MPa to 340 MPa, with a specific reactor surface area Aof 2 m/(t/h) to 5.5 m/(t/h), and the tubular reactor has a specific ratio RDof 0.0050 MPato 0.0069 MPaand an inner surface which has a surface roughness Ra of 2 &#x3bc;m or less.

High-pressure polymerization process of ethylenically unsaturated monomers in a tubular reactor

The present disclosure relates to a process for separating polymeric and gaseous components of a reaction mixture obtained by high-pressure polymerization of ethylenically unsaturated monomers in the presence of free-radical polymerization initiators into in a gaseous fraction and a liquid fraction, wherein the separation is carried out at a pressure of from 15 MPa to 50 MPa and a temperature of from 120&#xb0; C. to 300&#xb0; C. in a separation vessel which has a vertically arranged cylindrical shape with a ratio of length to diameter L/D of from 4 to 10 and which is equipped with an inlet pipe which extends vertically from the top into the separation vessel; and the ratio of the inner diameter of the inlet pipe at its lower end and the inner diameter of the separating vessel in its cylindrical part is in the range of from 0.2 to 0.4.

Process for separating components of a reaction mixture obtained by high-pressure polymerization of ethylenically unsaturated monomers

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.

Hydraulically controlled pressure relief valve for high-pressure reactors

In a process for preparing polyethylene in tube reactors with or without autoclaves, where a free-radical initiator is introduced with or without cold ethylene into a flowing ethylene- and comonomer-containing medium, rotation is generated between two streams () to be mixed at an angle () or by provision of a swirl element () in the flow cross section (). In the region of a feed point () for a free-radical initiator, there is provided a cross-sectional constriction () at which the free-radical initiator is introduced through an optimized off-center outlet opening () of an introduction finger () into the rotating flow ().

Device for feeding reactor initiators

In a process for the polymerization of ethylene and optionally further monomers in a high-pressure reactor at from 120 to 350&#xb0; C. and pressures of from 1000 to 4000 bar, hydrogen is intermittently introduced into the reactor.

Method for high pressure polymerization of ethylene

The invention relates to a method for producing ethylene homo- and copolymers in a tubular reactor at pressures above 1000 bar and temperatures in the range from 120 to 350&deg; C. by free-radical polymerization, in which firstly small amounts of free-radical chain initiators are added to a mobile flow medium comprising ethylene, molecular weight regulator and optionally polyethylene, and the polymerization is then carried out. In accordance with the invention, the mobile flow medium is firstly split into two volume elements flowing separately from one another, the volume elements flowing separately from one another are then set in rotation in opposite directions by means of suitable flow elements, the flowing volume elements rotating in opposite directions are then recombined to form a mobile flow medium, and then, at the moment of or shortly after the combining of the flowing volume elements rotating in opposite directions, the free-radical chain initiator is fed into the sheared interfacial region between the flowing volume elements rotating in opposite directions. The invention also relates to an apparatus for carrying out this method.

Method for producing ethylene homo-and copolymers by intensively mixing a reactive reaction component with a mobile flow medium

In a process for the high-pressure polymerization of ethylene in a high-pressure autoclave or in a high-pressure tube reactor having one or more metering points for one or more peroxides, no peroxide or a reduced amount of peroxide is metered in during the time interval in which the pressure is lowered by opening a pressure maintenance valve and the original amount of peroxide per unit time is metered in again as soon as the pressure after closure of the pressure maintenance valve has built up again so that it exceeds 90% of the pressure difference between nominal pressure and lowered pressure.

Process optimization of peroxide injection during polyethylene production

Growing community of inventors

Dannstadt-Schauernheim, Germany

Georg Groos