SYSTEMS AND METHODS FOR ACTIVATION OF CHROMIUM CATALYST

RU2026107407APending Publication Date: 2026-07-02CHEVRON PHILLIPS CHEMICAL COMPANY LP
View PDF 0 Cites 0 Cited by

Patent Information

Authority / Receiving Office
RU · RU
Patent Type
Applications
Current Assignee / Owner
CHEVRON PHILLIPS CHEMICAL COMPANY LP
Filing Date
2024-11-07
Publication Date
2026-07-02

AI Technical Summary

Technical Problem

Existing methods for activating supported chromium pre-catalysts result in low conversion to Cr(VI) and inefficient production of high melt index polymers with low film gel content, while also posing challenges in controlling exotherms during the activation process.

Method used

A process involving exposure of a pre-catalyst in a fluidized bed vessel to alternating cycles of oxidizing and inert gases at controlled temperatures and hold times, which helps in achieving high Cr(VI) content and improved polymer properties without significant exothermic issues.

Benefits of technology

The proposed method effectively produces activated chromium catalysts with high Cr(VI) content, enabling the production of ethylene-based polymers with enhanced melt index potential, broad molecular weight distribution, and low film gel levels, while minimizing exothermic reactions and emissions.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

Processes for producing activated chromium catalysts such as chromium / silica catalysts and titanated chromium / silica catalysts are disclosed, and these processes utilize a multistep process involving exposure to inert and oxidizing atmospheres at specific temperature conditions. The resulting activated chromium catalysts have unexpectedly high melt index potential and can produce ethylene-based polymers with lower gel counts in addition to higher melt indices. Related activation systems are provided in which the fluidizing gas entering the fluidized bed vessel can be adjusted between an inert gas, an oxygen-containing gas, or a mixture of the inert gas and the oxygen-containing gas to minimize or prevent exotherms.
Need to check novelty before this filing date? Find Prior Art