Chromium catalyst, its preparation and use
AssigneeBASF SE
InventorsWeiqing Joe Zou, David James Brockway, Peter Pfab, Matthias Georg Schwab
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Abstract
Disclosed herein is a chromium oxide catalyst composition having reduced levels of chromium (VI), methods of making a chromium oxide catalyst composition and system, and illustrative uses of the chromium oxide catalyst composition and system. The catalyst disclosed may be a gel and may comprise chromium(III) oxide and chromium(VI) oxide at an amount of about 10,000 ppm or less based on total chromium oxide contents in the chromium oxide catalyst composition.
Claims16
A process for preparing a chromium oxide catalyst composition, the process comprising:
- dissolving chromium(VI) oxide in an aqueous reagent to form solution A;
- adding a reducing organic solvent to form a slurry,
- wherein a molar ratio of the organic solvent to the chromium(VI) oxide ranges from about 0.2 to about 4.0;
- and
- drying the slurry to form a powder.
A process for preparing a chromium oxide catalyst composition, the process comprising:
- dissolving chromium(VI) oxide in an aqueous solvent;
- adding isobutyl alcohol to form a slurry;
- and
- drying the slurry to form a powder.
A process for preparing a chromium oxide catalyst composition, the process comprising:
- combining isobutyl alcohol and an aqueous solution of chromium(VI) oxide to form a mixture;
- heating the mixture to form a slurry;
- and
- drying the slurry to form a powder;
- wherein the powder has chromium(VI) oxide at an amount of about 1000 ppm or less based on total chromium oxides content in the chromium oxide catalyst composition.
Dependencies are inferred from the claim text.