Method for recovering transition metal tetrahalide and hydrocarbons from a waste stream
AssigneeBorealis AG
InventorsMikko Lylykangas, Jukka Räsänen, Klaus Nyfors, Pekka Malinen
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Abstract
The present invention provides a process for recovering transition metal tetrahalides from a waste stream coming from a catalyst manufacturing process by (a) establishing a mixed stream comprising transition metal tetrahalide and transition metal alkoxyhalides; (b) forming a falling liquid film from the mixed stream of step (a) at a temperature of from 25 to 85° C. and an absolute pressure of from 0.05 to 0.6 bar; and (c) establishing from the film of step (b) a first vapour stream containing from 90 to 100% of recoverable components and a second liquid stream containing about 10 to 80% of titanium haloalkoxides.
Claims19
A process for recovering TiCl4 from a process stream, the process comprising the steps of:
- (a) establishing a mixed stream comprising hydrocarbon(s), TiCl4, and a transition metal haloalkoxide by decanting excess liquid phase from a catalyst slurry comprising hydrocarbon(s), TiCl4 and the transition metal haloalkoxide;
- (b) forming a falling liquid film from the mixed stream of step (a) at a temperature of from 50 to 85° C. and an absolute pressure of from 0.1 to 0.6 bar;
- (c) establishing from the film of step (b):
- an amount of a distillate, the distillate containing from 90 to 100% by weight of recoverable components, the recoverable components comprising hydrocarbon(s) and TiCl4, and
- an amount of a residue, the residue containing about 20 to 80% by weight of the transition metal haloalkoxide;
- and
- (d) distilling said distillate to form a top fraction and a bottom fraction, said top fraction comprising hydrocarbon(s) and said bottom fraction comprising TiCl4.
A process for recovering TiCl4 from a process stream, the process comprising the steps of:
- (ai) establishing a mixed stream comprising TiCl4 and a first transition metal haloalkoxide by decanting excess liquid phase from a catalyst slurry comprising TiCl4 and the first transition metal haloalkoxide;
- (aii) establishing a second mixed stream comprising TiCl4 and a second transition metal haloalkoxide by:
- (a-1) contacting a solid olefin polymerization catalyst component with a wash liquid to thereby produce a mixture comprising the solid olefin polymerization catalyst component and a liquid component;
- (a-2) dividing the mixture of step (a-1) into a product fraction comprising majority of the solid catalyst component and a liquid fraction comprising the liquid component;
- (a-3) recovering the liquid fraction;
- and
- (a-4) establishing the second mixed stream from said liquid fraction;
- (aiii) combining the first mixed stream and the second mixed stream to form a combined mixed stream;
- (b) forming a falling liquid film from the combined mixed stream of step (aiii) at a temperature of from 50 to 85° C. and an absolute pressure of from 0.1 to 0.6 bar;
- and
- (c) establishing from the film of step (b):
- an amount of a distillate, the distillate containing from 90 to 100% by weight of recoverable components, the recoverable components comprising TiCl4, and
- an amount of a residue, the residue containing about 20 to about 80% by weight of the first transition metal haloalkoxide, the second transition metal haloalkoxide, or a combination thereof.
A process for recovering TiCl4 from a process stream, the process comprising the steps of:
- (a) establishing a mixed stream comprising TiCl4 and a transition metal haloalkoxide by
- (a-1) contacting a solid olefin polymerization catalyst component with a wash liquid thereby producing a mixture comprising the solid catalyst component and a liquid component, wherein the wash liquid comprises TiCl4;
- and
- (a-2) dividing the mixture of step (a-1) into a product fraction comprising a majority of the solid catalyst component and a liquid fraction comprising the liquid component;
- (a-3) recovering the liquid fraction;
- and
- (a-4) establishing said mixed stream from said liquid fraction;
- (b) forming a falling liquid film from the mixed stream of step (a) at a temperature of from 50 to 80° C. and an absolute pressure of from 0.1 to 0.6 bar;
- (c) establishing from the film of step (b):
- an amount of a distillate, the distillate containing from 90 to 100% by weight of recoverable components, the recoverable components comprising TiCl4 and the wash liquid, and
- an amount of a residue, the residue containing about 20 to 80% by weight of the transition metal haloalkoxide,
- wherein the ratio of the amount of residue to the amount of distillate (R/D) is from 0.05 to 0.35;
- and
- (d) distilling said distillate to form a top fraction and a bottom fraction, said bottom fraction comprising TiCl4.
Dependencies are inferred from the claim text.