ILIAS CHEMISTRY - M.E.S. Indian School,Doha
Would you like to react to this message? Create an account in a few clicks or log in to continue.

ILIAS CHEMISTRY - M.E.S. Indian School,Doha

This is a forum for the students of MES, to get note and ask doubts to the chemistry department of the school.
 
HomeLatest imagesSearchRegisterLog in

 

 Procedure of 2,3-Naphthalenedicarboxylic acid

Go down 
AuthorMessage
1637237353
New Student
New Student



Posts : 13
Join date : 2011-07-11

Procedure of 2,3-Naphthalenedicarboxylic acid Empty
PostSubject: Procedure of 2,3-Naphthalenedicarboxylic acid   Procedure of 2,3-Naphthalenedicarboxylic acid Icon_minitimeWed Aug 03, 2011 8:46 am

The reactions occur in an autoclave. The autoclave is charged with 200 g (1.28 moles) of 2,3-dimethylnaphthalene, 940 g (3.14 moles, 23% excess) of sodium dichromate dihydrate, and 1.8 L of water. The autoclave is closed, heated to 250 °C, and shaken continuously at this temperature for 18 hours. The autoclave is cooled with continued agitation, the pressure is released, and the autoclave is opened. The contents are transferred to a large vessel. To effect complete transfer, the autoclave is rinsed with several 500ml. portions of hot water. Green hydrated chromium oxide in the reaction mixture is separated on a large Büchner funnel and washed with warm water until the filtrate is colorless. The combined filtrates (7–8 L) are acidified with 1.3L of 6N hydrochloric acid. The acidified mixture is allowed to cool to room temperature overnight. The 2,3-naphthalenedicarboxylic acid that has precipitated is collected on a large Büchner funnel, washed with water until the filtrate is colorless, and dried to constant weight in a vacuum oven at 50°C/20 mm. or by long standing in air. The 2,3-naphthalenedicarboxylic acid is a white powder; m.p. 239–241°C; weight 240–256 g. (87–93%). The synthetic route is as follows:

This procedure illustrates a general method for the preparation of aromatic carboxylic acids by oxidation of the corresponding alkylarenes.
Back to top Go down
 
Procedure of 2,3-Naphthalenedicarboxylic acid
Back to top 
Page 1 of 1
 Similar topics
-
» Procedure of 1,5-Pentanediol
» The Uses of Gibberellic Acid
» Uses of Ferulic acid
» The role of phenylacetic acid
» How tannic acid production

Permissions in this forum:You cannot reply to topics in this forum
ILIAS CHEMISTRY - M.E.S. Indian School,Doha :: Chat with your Teacher :: Doubts on Related Topics-
Jump to: