Patent · US Expired

Device for feeding reactor initiators

US6951908B2 · kind B2 · utility

8Cited by

5References

20Claims

0Family size

Assignee

Basell Polyolefine GmbH · DE

Inventors

Georg Groos · Schifferstadt, DE
Frank-Olaf Mähling · Mannheim, DE
Andreas Daiss · Deidesheim, DE
Dieter Littmann · Heßheim, DE
Kaspar Evertz · Schifferstadt, DE

Key dates

Filing date	Nov 27, 2001
Grant date	Oct 4, 2005
Priority date	—
Expiry date	Nov 27, 2021

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB01J2219/00772
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

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 (61, 62) to be mixed at an angle (66) or by provision of a swirl element (20, 80) in the flow cross section (27, 28). In the region of a feed point (72, 81) for a free-radical initiator, there is provided a cross-sectional constriction (63, 67, 71) at which the free-radical initiator is introduced through an optimized off-center outlet opening (44) of an introduction finger (40) into the rotating flow (61, 62, 70).

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.