Oxygen Effect in Heteromultimetallic Catalysis: Oxygen-Bridged Catalysts for Olefin Polymerization Process

2019 ◽  
pp. 271-306
Author(s):  
Prabhuodeyara M. Gurubasavaraj ◽  
Herbert W. Roesky ◽  
Narayan S. Hosmane
Keyword(s):  
Olefin Polymerization ◽  
Polymerization Process ◽  
Oxygen Effect

Toward Controlling the Metallocene/Methylaluminoxane-Catalyzed Olefin Polymerization Process by a Computational Approach

2015 ◽  
Vol 34 (14) ◽  
pp. 3586-3597 ◽  
Author(s):  
Mikhail S. Kuklin ◽  
Janne T. Hirvi ◽  
Manfred Bochmann ◽  
Mikko Linnolahti
Keyword(s):  
Olefin Polymerization ◽  
Computational Approach ◽  
Polymerization Process

Experimental investigation on mechanisms of fine particles generation for the Borealis Borstar multistage olefin polymerization process

2018 ◽  
Vol 135 (36) ◽  
pp. 46589 ◽  
Author(s):  
Binbo Jiang ◽  
Jian Ye ◽  
Zuwei Liao ◽  
Xiaomei Shi ◽  
Zhengliang Huang ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Olefin Polymerization ◽  
Fine Particles ◽  
Polymerization Process

5629255 Highly active catalysts for olefin polymerization and a polymerization process using these catalysts

1997 ◽  
Vol 125 (2-3) ◽  
pp. 174
Author(s):  
Norbert Hafner ◽  
oltsch Wilfried Tuml ◽  
Hans Ledwinka ◽  
Wolfgang Neissl
Keyword(s):  
Olefin Polymerization ◽  
Polymerization Process ◽  
Highly Active

Oxygen Effect in Heterobimetallic Catalysis:  The Zr−O−Ti System as an Excellent Example for Olefin Polymerization‡

2007 ◽  
Vol 26 (14) ◽  
pp. 3346-3351 ◽  
Author(s):  
Prabhuodeyara M. Gurubasavaraj ◽  
Herbert W. Roesky ◽  
Prabhuodeyara M. Veeresha Sharma ◽  
Rainer B. Oswald ◽  
Volker Dolle ◽  
...  
Keyword(s):  
Olefin Polymerization ◽  
Oxygen Effect

Steady-State and Dynamic Modeling of the Basell Multireactor Olefin Polymerization Process

2011 ◽  
Vol 50 (1) ◽  
pp. 322-331 ◽  
Author(s):  
Zu-Wei Zheng ◽  
De-Pan Shi ◽  
Pei-Lin Su ◽  
Zheng-Hong Luo ◽  
Xiao-Jun Li
Keyword(s):  
Steady State ◽  
Dynamic Modeling ◽  
Olefin Polymerization ◽  
Polymerization Process

The Effects of Amines on the Esterase Activities of Thrombin and Thrombokinase and on Several Clotting Tests

1974 ◽  
Vol 31 (02) ◽  
pp. 309-318
Author(s):  
Phyllis S Roberts ◽  
Raphael M Ottenbrite ◽  
Patricia B Fleming ◽  
James Wigand
Keyword(s):  
Choline Chloride ◽  
Polymerization Process ◽  
Ammonium Bromide ◽  
Bovine Thrombin ◽  
One Stage ◽  
Human Proteins ◽  
Rate Of Hydrolysis ◽  
The One ◽  
Hydrolysis Of Esters ◽  
Hydrolysis Of

Summary1. Choline chloride, 0.1 M (in 0.25 M Tris. HCl buffer, pH 7.4 or 8.0, 37°), doubles the rate of hydrolysis of TAME by bovine thrombokinase but has no effect on the hydrolysis of this ester by either human or bovine thrombin. Only when 1.0 M or more choline chloride is present is the hydrolysis of BAME by thrombokinase or thrombin weakly inhibited. Evidence is presented that shows that these effects are due to the quaternary amine group.2. Tetramethyl ammonium bromide or chloride has about the same effects on the hydrolysis of esters by these enzymes as does choline chloride but tetra-ethyl, -n.propyl and -n.butyl ammonium bromides (0.1 M) are stronger accelerators of the thrombokinase-TAME reaction and they also accelerate, but to a lesser degree, the thrombin-TAME reaction. In addition, they inhibit the hydrolysis of BAME by both enzymes. Their effects on these reactions, however, do not follow any regular order. The tetraethyl compound is the strongest accelerator of the thrombokinase-TAME reaction but the tetra-ethyl and -butyl compounds are the strongest accelerators of the thrombin-TAME reaction. The ethyl and propyl compounds are the best (although weak) inhibitors of the thrombokinase-BAME and the propyl compound of the thrombin-BAME reactions.3. Tetra-methyl, -ethyl, -n.propyl and -n.butyl ammonium bromides (0.01 M) inhibit the clotting of fibrinogen by thrombin (bovine and human proteins) at pH 7.4, imidazole or pH 6.1, phosphate buffers and they also inhibit, but to a lesser degree, a modified one-stage prothrombin test. In all cases the inhibition increases regularly as the size of the alkyl group increases from methyl to butyl. Only the ethyl com pound (0.025 M but not 0.01 M), however, significantly inhibits the polymerization of bovine fibrin monomers. It was concluded that inhibition of the fibrinogen-thrombin and the one-stage tests by the quaternary amines is not due to any effect of the com pounds on the polymerization process but probably due to inhibition of thrombin’s action on fibrinogen by the quaternary amines.

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