Just wanting to vent.... (1 Viewer)

Joe OKC

"Better Days"
Gold VIP Contributor
Joined
Sep 1, 1997
Messages
20,412
Reaction score
6,968
Age
56
Location
OKC, OK
Offline
The types of the compound catalyst systems primarily include metallocene/metallocene compound catalyst systems and metallocene/Ziegler-Natta compound catalyst systems, with the latter being particularly preferred. By compounding a metallocene catalyst with a Ziegler-Natta catalyst, it is possible to overcome the disadvantages of the metallocene catalyst system, such as a single active center, narrow molecular weight distribution of the resulting polymers and poor processability, while maintaining its advantages, such as good stereoregularity of the resulting polymers, good copolymerizability and the like. For example, European Patent Application Publication 0 447 070 A1 discloses a solid catalyst suitable for polymerizing olefins in a heterogeneous process, comprising (1) a solid support containing from 80 to 99.5 mol % of magnesium dichloride and from 0.5 to 20 mol % of an electron-donor compound free from labile hydrogen, (2) an electron-donor compound containing labile hydrogen, (3) a zirconium metallocene, (4) at least one halide of a transition metal chosen from titanium and vanadium, and (5) an organoaluminum compound, preferably an aluminoxane compound. The catalyst disclosed therein is prepared by supporting zirconium and titanium or vanadium onto the support formed from magnesium dichloride and is suitable for the heterogeneous polymerization of olefins, and however, such a catalyst has a relatively low activity and the molecular weight distribution (Mw/Mn) of the resulting polymer is only about 4, which is still relatively narrow. European Patent Application Publication 0 447 071 A1 discloses a compound solid catalyst suitable for polymerizing olefins, comprising (1) a support containing from 90 to 99.9mol % of magnesium dichloride and from 0.1 to 10 mol % of an electron-donor compound free from labile hydrogen, (2) a zirconium metallocene, (3) at least one halide of a transition metal chosen from titanium and vanadium, and (4) an organoaluminum compound, preferably an aluminoxane compound. The catalyst disclosed therein is prepared by supporting zirconium and titanium or vanadium onto the support formed from magnesium dichloride and is suitable for the heterogeneous polymerization of olefins, and can produce polymers having better particle morphology (Dm/Dn: 1.5; bulk density: 0.3-0.4 g/cm3). Although such a catalyst has a higher ratio of Zr to Ti, for example from 2 to 20, it has a relatively low activity and the molecular weight distribution (Mw/Mn) of the resulting polymer is only about 5, which is still relatively narrow. The reason may be that part of zirconium supported is inactive for being covered, thus decreasing the activity of the whole catalyst.
 

Superfan

45th
Joined
Jul 10, 2001
Messages
9,685
Reaction score
3,534
Age
39
Location
Delta Quadrant
Offline
<object width="425" height="355"><param name="movie" value="http://www.youtube.com/v/t-tRErs5UcI&hl=en"></param><param name="wmode" value="transparent"></param><embed src="http://www.youtube.com/v/t-tRErs5UcI&hl=en" type="application/x-shockwave-flash" wmode="transparent" width="425" height="355"></embed></object>
 

Frank The Rat

Official SR twitter team
VIP Contributor
Joined
Apr 20, 2000
Messages
22,860
Reaction score
7,820
Age
42
Location
Albany, LA
Offline
Joe, I will have to take your word for it man. That is some deep stuff:D
 

geauxboy

Boo Boo Bear
VIP Subscribing Member
Joined
Dec 13, 2001
Messages
19,176
Reaction score
3,807
Location
Right chere
Offline
You had me at compound catalyst. No really, you did. You had me thoroughly confused by that point.
 

billinms

Tiptoeing Through the Tulips
VIP Subscribing Member
Joined
Oct 1, 2004
Messages
19,649
Reaction score
24,609
Age
49
Location
Ocean Springs
Offline
I'm too hung over to read all that. Today is gonna suck.
 

Richard

Administrator
Staff member
Administrator
Joined
Jul 11, 2001
Messages
18,822
Reaction score
8,737
Age
66
Location
Laurel, MS
Offline
I know Ziegler-Natta about this.
 

Thorin

Idle
Joined
Dec 9, 2006
Messages
7,800
Reaction score
957
Age
48
Location
Shreveport, Tx.
Offline
Hey, that's the recipe for Popeye's Red Beans and Rice, stop stealing other people's material.
 

MackeyM

atakapa refugee
Joined
Oct 20, 2006
Messages
1,441
Reaction score
83
Location
Bradford's Ordinary
Offline
A cleaner, more environmentally friendly laundry detergent?

Just another step towards removing hydrocarbon based polymers from our society.

Check surfactant systems.

Good find, Joe.
 

Redlands Saints

killing threads daily
VIP Subscribing Member
Gold VIP Contributor
Joined
Sep 9, 2005
Messages
4,056
Reaction score
465
Location
Redlands, CA
Offline
joe, I thought this was gonna be another striper story. WTH I thought you were a strip club manager not a rocket scientist. now I wonder.
 

keepoursaints

I hate American Airlines
VIP Contributor
Joined
May 13, 2005
Messages
29,979
Reaction score
8,063
Age
40
Offline
joe, I thought this was gonna be another striper story. WTH I thought you were a strip club manager not a rocket scientist. now I wonder.

fintalk-striper1.jpg


:idunno:
 

Create an account or login to comment

You must be a member in order to leave a comment

Create account

Create an account on our community. It's easy!

Log in

Already have an account? Log in here.

Users who are viewing this thread

 

New Orleans Saints Twitter Feed

 

Headlines

Top Bottom