A process for the preparation of 1,3:2,4-bis (4-methylbenzylidene) sorbitol (MDBS) and 1,3:2,4-bis (3,4-dimethylbenzylidene) sorbitol (DMDBS) via a dehydrocondensation reaction is disclosed. The reaction is carried out between an aldehyde and an alditol in a mole ratio of 2:1 wherein ionic fluid is used as the acidic catalyst and/or reaction medium. The ionic fluid used in accordance with the present invention is quaternary ammonium salt based ionic liquid.
The present invention is directed to a process for the preparation of 1,3:2,4-bis (4-methylbenzylidene) sorbitol (MDBS) and 1,3:2,4-bis (4-dimethylbenzylidene) sorbitol (DMDBS) by dehydrocondensating an aldehyde and an alditol using a hydrophobic ionic liquid as an acid catalyst. The ionic liquid used in the accordance with the process of the present invention is a phosphonium ion based ionic liquid.
[EN] PROCESS FOR THE PREPARATION OF ALDITOL ACETALS<br/>[FR] PROCÉDÉ DE PRÉPARATION D'ACÉTALS D'ALDITOL
申请人:RELIANCE IND LTD
公开号:WO2012095858A1
公开(公告)日:2012-07-19
The present invention is directed to a process for the preparation of l,3:2,4-bis (4- methylbenzylidene) sorbitol (MDBS) and 1,3:2,4-bis (4-dimethylbenzylidene) sorbitol (DMDBS) by dehydrocondensating an aldehyde and an alditol using a hydrophobic ionic liquid as an acid catalyst. The ionic liquid used in the accordance with the process of the present invention is a phosphonium ion based ionic liquid.
[EN] PROCESS FOR PREPARATION OF ACETALS<br/>[FR] PROCÉDÉ DE PRÉPARATION D'ACÉTALS
申请人:RELIANCE IND LTD
公开号:WO2012095855A1
公开(公告)日:2012-07-19
A process for the preparation of 1,3:2,4-bis(4-methylbenzylidene) sorbitol (MDBS) and 1,3:2,4-bis(3,4-dimethylbenzylidene) sorbitol (DMDBS) via a dehydrocondensation reaction is disclosed. The reaction is carried out between an aldehyde and an alditol in a mole ratio of 2:1 wherein ionic liquid is used as the acidic catalyst and/or reaction medium. The ionic liquid used in the process is quaternary ammonium salt based ionic liquid.
[EN] PROCESS FOR PREPARING ALDITOL ACETALS<br/>[FR] PROCÉDÉ DE PRÉPARATION D'ACÉTALS D'ALDITOL
申请人:RELIANCE IND LTD
公开号:WO2012095856A1
公开(公告)日:2012-07-19
A process for preparing alditol acetals via a dehydrocondensation reaction is disclosed. The reaction is carried out by adding an aldehyde and an alditol using a metal salt based ionic liquid as an acid catalyst. The ionic liquid used in the process is prepared by dissolving a hydrogen donor and a compound providing counter ion in a solvent.