Complete IIT AIEEE ICSE ISC PMT help forum
This is a free help Forum for Indian Students.
Complete IIT AIEEE ICSE ISC PMT help forum

Complete help forum for students preparing for icse iit aieee cbse pmt and other related exams.Stay updated about all 2011 exams.
 
HomeHome  PortalPortal  FAQFAQ  SearchSearch  RegisterRegister  MemberlistMemberlist  UsergroupsUsergroups  Log in  India NewsIndia News  
Keywords
RESULT CLASS YEAR 2010
Latest topics
Top posters
abhas
 
Anu..i luv icse...:)
 
G-7
 
siya
 
Candy
 
jOhNy
 
Apurva
 
WinRrule
 
ambili
 
saif
 



Search if you can't find it here

Purification of Naphthalene

View previous topic View next topic Go down
AuthorMessage
happy1987




PostSubject: Purification of Naphthalene Wed Aug 31, 2011 2:09 pm

Naphthalene (CAS NO. 91-20-3) is crystd one or more times from the following solvents: EtOH, MeOH, CCl4, benzene, glacial acetic acid, acetone or diethyl ether, followed by drying at 60C in an Abderhalden drying apparatus. It is also purified by vacuum sublimation and by fractional crystn from its melt.
Other purification procedures include refluxing in EtOH over Raney Ni, and chromatography of a CCl4 soln on alumina with benzene as eluting solvent. Baly and Tuck purified naphthalene for spectroscopy by heating with conc H2SO4 and MnO2, followed by steam distn (repeating the process), and formation of the picrate which, after recrystallisation, was decomposed and the naphthalene was steam distd. It was then crystd from dilute EtOH. It can be dried over P2O5 under vacuum. It is also purified by sublimation and subsequent crystn from cyclohexane. Alternatively, it has been washed at 85O with 10% NaOH to remove phenols, with 50% NaOH to remove nitriles, with 10% H2SO4 to remove organic bases, and with 0.8g AlCl3 to remove thianaphthalenes and various alkyl derivatives. Then it was treated with 20% H2SO4, 15% Na2CO3 and finally distd.
Zone refining purified naphthalene from anthracene, 2,4-dinitrophenylhydrazine, methyl violet, benzoic acid, methyl red, chrysene, pentacene and indoline.
Back to top Go down
View user profile

Purification of Naphthalene

View previous topic View next topic Back to top
Page 1 of 1

Permissions in this forum:You cannot reply to topics in this forum
Complete IIT AIEEE ICSE ISC PMT help forum :: Chemistry :: Chemistry Question answer-