Effect of process conditions on the spray characteristics of a PLA+methylene chloride solution in the supercritical antisolvent precipitation process

2007 ◽  
Vol 42 (2) ◽  
pp. 299-309 ◽  
Author(s):  
Daniel L. Obrzut ◽  
Philip W. Bell ◽  
Christopher B. Roberts ◽  
Steve R. Duke
Keyword(s):  
Chloride Solution ◽  
Methylene Chloride ◽  
Precipitation Process ◽  
Process Conditions ◽  
Spray Characteristics ◽  
Antisolvent Precipitation ◽  
Supercritical Antisolvent ◽  
Methylene Chloride Solution ◽  
Supercritical Antisolvent Precipitation

Supercritical Antisolvent Precipitation Process

2019 ◽  
Author(s):  
Diego T. Santos ◽  
Ádina L. Santana ◽  
M. Angela A. Meireles ◽  
Ademir José Petenate ◽  
Eric Keven Silva ◽  
...  
Keyword(s):  
Precipitation Process ◽  
Antisolvent Precipitation ◽  
Supercritical Antisolvent ◽  
Supercritical Antisolvent Precipitation

The addition of 2,4-dinitrobenzenesulphenyl chloride to 1,3-disubstituted allenes: a reexamination

1979 ◽  
Vol 57 (1) ◽  
pp. 119-127 ◽  
Author(s):  
Dennis G. Garratt ◽  
Pierre Beaulieu
Keyword(s):  
Double Bond ◽  
Chloride Solution ◽  
Methylene Chloride ◽  
Effective Mechanism ◽  
Substituent Group ◽  
Methylene Chloride Solution ◽  
Inductive Effects ◽  
Allene System

The reaction of 2,4-dinitrobenzenesulphenyl chloride with eight alkyl 1,3-disubstituted allenes in methylene chloride solution has been investigated. In contrast to earlier reports, attack by sulphur is found to occur exclusively at the central allenic carbon. The direction of approach of sulphenyl chloride leads preferentially to the formation of the E isomers in accord with the concept of steric approach control. The ratio of E to Z alkene is found to increase as the bulk of the substituent group cis to the arylthio group increases. We observe, however, very little regioselectivity with respect to which of the mutually perpendicular π bonds of the allene system is attacked, suggesting the presence of an effective mechanism for transmission of inductive effects to the more distant double bond.

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