Abstract: The present invention relates to a polymerization process, comprising: a) supplying a feed containing ethylene and at least one alpha-olefin having 3 to 12 carbon atoms in a hydrocarbon solvent to a polymerization reactor, b) contacting the feed of step a) in the reactor with a catalyst to form a reaction mixture containing an ethylene-alpha-olefin co-polymer, c) withdrawing the reaction mixture from the polymerization reactor as a reactor outlet stream which comprises the ethylene-alpha-olefin co-polymer, unreacted monomer and comonomer, catalyst, and hydrocarbon solvent, d) heating the reactor outlet stream to a temperature which is at least 5° C. higher than the temperature of the reaction mixture at the outlet of the reactor for a time period of between 1 and 250 seconds in order to de-activate the polymerization catalyst, and e) separating hydrocarbon solvent, monomer and comonomer from the reactor outlet stream and recycling it back to the polymerization reactor without further purification steps.

Abstract: The present invention relates to a process for preparing an alpha-olefin feed stream comprising providing a low-pressure initial stream comprising a hydrocarbon solvent at a low pressure level in the range of from below atmospheric pressure to 15 barg; pressurizing the low-pressure initial stream to a medium pressure level in the range of from greater than 15 to 45 barg to form a medium-pressure initial stream; pressurizing the medium-pressure initial stream to a high pressure level in the range of from greater than 45 to 300 barg to form a high-pressure initial stream; wherein a monomer stream comprising an alpha-olefin monomer is introduced into the medium-pressure initial stream at medium pressure level and/or into the high-pressure initial stream at high pressure level, and one or more comonomer streams comprising at least one alpha-olefin comonomer is/are introduced into the low-pressure initial stream at low pressure level, and/or into the medium-pressure initial stream at medium pressure level, and/or

Abstract: The present invention relates to polyethylene mixed color blend having (i) a melt flow rate (ISO1133, 5.0 kg; 190° C.) of 0.1 to 10 g/10 min, (ii) a density of 950 to 990 kg/m3 (ISO1183); (iii) a C2 fraction in amount of at least 95.0 wt.-%, as measured by 13C-NMR of the d2-tetrachloroethylene soluble fraction; (iv) a homopolymer fraction (HPF) content determined according to Chemical Composition Analysis by Cross Fractionation Chromatography (CFC) in the range from 73.0 to 91.0 wt.-%; (v) a copolymer fraction (CPF) content determined according to Chemical Composition Analysis Cross Fractionation Chromatography (CFC) in the range from 10.0 to 22.0 wt.-%; (vi) a total content of heavy metals selected from Cr, Cd, Hg and Pb of not more than 100 ppm with respect to the total polyethylene blend, as measured by x-ray fluorescence (XRF); and (vii) a Full Notch Creep Test (FNCT) determined according to ISO 16770-2019 at 50° C. and 6.0 MPa in 2 wt.-% Arkopal N100, of at least 3.

Abstract: A mechanical polyolefin recycling process, comprising a particular combination of processing steps in a given order, providing access to highly pure recycled polyolefin grades, having well balanced mechanical and optical properties that are superior to those typically seen in similar recycled polyolefin grades and a mechanical polyolefin recycling apparatus configured for carrying out the mechanical polyolefin recycling process

Abstract: The present invention concerns a polypropylene mixed color blend having (i) a crystalline fraction (CF) content determined according to CRYSTEX QC analysis, in the range from 85.0 to 95.0 wt.-%, (ii) a soluble fraction (SF) content in the range from 5.0 to 15.0 wt.-%, (iii) a total ethylene content (C2), in the range from 2.0 to 10.0 wt.-%, (iv) said crystalline fraction (CF) has a propylene content (C3 (CF)) as determined by FT-IR spectroscopy calibrated by quantitative 13C-NMR spectroscopy, in the range from 93.0 to 99.0 wt.-%; (v) said crystalline fraction (CF) has an ethylene content (C2 (CF)), as determined by FT-IR spectroscopy calibrated by quantitative 13C-NMR spectroscopy, in the range from [C2]-3.4 wt.-% to [C2]-0.2 wt.-%, wherein [C2] is the total ethylene content (C2) defined in (iii), (vi) a CIELAB color space (L*a*b*) measured according to DIN EN ISO 11664-4, of L* from 30.0 to 73.0; a* from ?10 to 25; and b* from ?5 to 20.

Abstract: A mechanical polyolefin recycling process. comprising a particular combination of processing steps in a given order, providing access to highly pure recycled polyolefin grades.

Abstract: Described herein is a polymerization reactor system comprising at least one loop reactor and/or at least one transfer line, and further comprising at least one withdrawal valve, wherein the at least one withdrawal valve is mounted to a wall of a lower horizontal segment of the loop reactor and/or to a wall of the transfer line, at an angle a of more than 0° and equal to or less than 85°, determined from perpendicular to a tangent of the wall at the mounting position in flow direction of a slurry in the loop reactor and/or in the transfer line.

Abstract: The present invention relates to a method for removing a foreign material from the surface of an article comprising the following steps: i) providing an article having a surface covered at least partly with a foreign material; ii) contacting the article provided in step i) with a cleaning medium being an acid having a pKa in the range from ?10 to 7 having a minimum concentration of 1 wt.

Abstract: Disclosed is a process for treating plastic waste chips containing a blend of polypropylene and polyethylene in an amount of at least 83.0 wt.-% to less than 100 wt.-% and further containing C7 to C11 aldehydes in an amount of 8000 ppb to 20000 ppb and limonene in an amount of 5 ppm to 500 ppm, the process comprising subjecting said plastic waste chips, in a fixed bed without stirring under standard pressure or reduced pressure, to a gas flow for achieving a Reynolds number in the range of 35 to 1200 at a temperature in the range of 20° C. to a point 10° C. below the Vicat softening point (10N, ISO 306) of said plastic waste and recovering the treated plastic waste chips containing C7 to C11 aldehydes in a total amount of 50 ppb to less than 5000 ppb limonene in an amount of 0.5 to 5 ppm.

Abstract: The present invention relates to a polymerization process, comprising: a) supplying a feed containing ethylene and at least one alpha-olefin having 3 to 12 carbon atoms in a hydrocarbon solvent to a polymerization reactor, b) contacting the feed of step a) in the reactor with a catalyst to form a reaction mixture containing an ethylene-alpha-olefin co-polymer, c) withdrawing the reaction mixture from the polymerization reactor as a reactor outlet stream which comprises the ethylene-alpha-olefin co-polymer, unreacted monomer and comonomer, catalyst, and hydrocarbon solvent, d) heating the reactor outlet stream to a temperature which is at least 5° C. higher than the temperature of the reaction mixture at the outlet of the reactor for a time period of between 1 and 250 seconds in order to de-activate the polymerization catalyst, and e) separating hydrocarbon solvent, monomer and comonomer from the reactor outlet stream and recycling it back to the polymerization reactor without further purification steps.

Abstract: The present invention relates to a process for removing hydrocarbons comprising the steps of: (A) passing a stream of a solution into a separator wherein a liquid phase comprising polymer and a vapour phase coexist; (B) withdrawing a vapour stream and a concentrated solution stream from the separator; (C) passing at least a part of the vapour stream into a first fractionator; (D) withdrawing a first overhead stream and a first bottom stream from the first fractionator; (E) passing the first overhead stream to a second fractionator; (F) withdrawing a second overhead stream and a second bottom stream from the second fractionator; (G) passing the second overhead stream to a third fractionator; (H) withdrawing a third overhead stream and a third bottom stream from the third fractionator; characterised in that at least a part of the third bottom stream is withdrawn as a purge stream.

Abstract: The invention provides a process for separating hydrogen from a gaseous feed stream in a polymerisation process, comprising the steps i) polymerising an olefin monomer and optionally at least one olefin comonomer, in the presence of a solvent optionally in the presence of hydrogen, so as to form a polymerisation reaction mixture comprising a polyolefin polymer, unreacted monomer(s), solvent and hydrogen; ii) separating said polyolefin polymer from said unreacted monomer(s), solvent and hydrogen; iii) feeding said unreacted monomer(s) and hydrogen to a condenser so as to form said gaseous feed stream; iv) contacting said gaseous feed stream with a hydrogen separating membrane so as to form a hydrogen-rich gaseous stream and a hydrogen-lean gaseous stream.

Abstract: A method for removing ink and/or a foreign material different from ink from the surface of an article, wherein at least a part of the surface of the article comprises a polymer, the method includes: i) providing an ink imprinted article and/or an article having a surface covered at least partly by a foreign material different from ink; ii) contacting the article provided in step i) with an acid having a pKa in the range from ?10 to 7 having a minimum concentration of 1 wt.-% for solving the ink and/or the foreign material different from ink or their degradation products in the acid; iii) separating the acid and the therein dissolved ink- and/or foreign material different from ink or their degradation products from the article to obtain a deinked article and/or an article with a surface free from foreign material.

Abstract: Disclosed is a process for treating plastic waste chips containing a blend of polypropylene and polyethylene in an amount of at least 83.0 wt.-% to less than 100 wt.-% and further containing C7 to C11 aldehydes in an amount of 8000 ppb to 20000 ppb limonene in an amount of 5 ppm to 500 ppm, the process comprising subjecting said plastic waste chips, in a fixed bed without stirring under standard pressure or reduced pressure, to a gas flow for achieving a Reynolds number in the range of 35 to 1200 at a temperature in the range of 20° C. to a point 10° C. below the Vicat softening point (10N, ISO 306) of said plastic waste and recovering the treated plastic waste chips containing C7 to C11 aldehydes in a total amount of 50 ppb to less than 5000 ppb limonene in an amount of 0.5 to 5 ppm.

Abstract: The present invention relates to a process for removing hydrocarbons comprising the steps of: (A) passing a stream of a solution into a separator wherein a liquid phase comprising polymer and a vapor phase coexist; (B) withdrawing a vapor stream and a concentrated solution stream from the separator; (C) passing at least a part of the vapour stream into a first fractionator; (D) withdrawing a first overhead stream and a first bottom stream from the first fractionator; (E) passing the first bottom stream to a second fractionator; (F) withdrawing a second overhead stream and a second bottom stream from the second fractionator; characterized in that at least a part of the second overhead stream is withdrawn as a purge stream.

Abstract: The present invention relates to a process for removing hydrocarbons comprising the steps of: (A) passing a stream of a solution into a separator wherein a liquid phase comprising polymer and a vapour phase coexist; (B) withdrawing a vapour stream and a concentrated solution stream from the separator; (C) passing at least a part of the vapour stream into a first fractionator; (D) withdrawing a first overhead stream and a first bottom stream from the first fractionator; (E) passing the first overhead stream to a second fractionator; (F) withdrawing a second overhead stream and a second bottom stream from the second fractionator; (G) passing the second overhead stream to a third fractionator; (H) withdrawing a third overhead stream and a third bottom stream from the third fractionator; characterised in that at least a part of the third bottom stream is withdrawn as a purge stream.

Abstract: The invention provides a process for separating hydrogen from a gaseous feed stream in a polymerisation process, comprising the steps i) polymerising an olefin monomer and optionally at least one olefin comonomer, in the presence of a solvent optionally in the presence of hydrogen, so as to form a polymerisation reaction mixture comprising a polyolefin polymer, unreacted monomer(s), solvent and hydrogen; ii) separating said polyolefin polymer from said unreacted monomer(s), solvent and hydrogen; iii) feeding said unreacted monomer(s) and hydrogen to a condenser so as to form said gaseous feed stream; iv) contacting said gaseous feed stream with a hydrogen separating membrane so as to form a hydrogen-rich gaseous stream and a hydrogen-lean gaseous stream.

Abstract: The present invention deals with a process for polymerising olefins in a solution and withdrawing a stream of the solution from the polymerisation reactor and passing it to a sequence of heating steps. The heated solution is passed to a separation step, which is conducted at a pressure of no more than 15 bar and in which separation step a liquid phase comprising the polymer and a vapour phase coexist. A vapour stream and a concentrated solution stream comprising the polymer are withdrawn from the separation step. At least a part of the vapour stream is passed to the first polymerisation reactor, to the second polymerisation reactor or to both.

Abstract: The present invention relates to a process for removing hydrocarbons comprising the steps of: (A) passing a stream of a solution into a separator wherein a liquid phase comprising polymer and a vapour phase coexist; (B) withdrawing a vapour stream and a concentrated solution stream from the separator; (C) passing at least a part of the vapour stream into a first fractionator; (D) withdrawing a first overhead stream and a first bottom stream from the first fractionator; (E) passing the first bottom stream to a second fractionator; (F) withdrawing a second overhead stream and a second bottom stream from the second fractionator; characterised in that at least a part of the second overhead stream is withdrawn as a purge stream.

Abstract: A process for producing a polymer composition comprising the steps (A) to (M) as recited herein, involving the polymerization, in a polymerization reactor of a first polymer, a first stream thereof being passed into a first separator wherein a first liquid phase comprising the polymer and a first vapor phase coexist; withdrawing a first vapor stream and a first concentrated solution stream comprising the polymer from the first separator, passing at least a part of the first vapor stream to a first fractionator; withdrawing a first overhead stream and a first bottom stream from the first fractionator; recovering at least a part of the first overhead stream as a first recycle stream and passing it to the polymerization reactor; passing the first concentrated solution stream from the first separator to a second separator, wherein a second liquid phase comprising the polymer and a second vapor phase coexist; passing at least a part of the second vapor stream to a second fractionator; withdrawing a second overhead