Process For Preparation Of Acetals
AssigneeReliance Industries Limited
InventorsParasu Veera UPPARA, Pavankumar ADURI, Mangesh SAKHALKAR, Uday RATNAPARKHI
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Abstract
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.
Claims15
A process for preparation of acetal derivatives selected from the group consisting of DMDBS (1,3:2,4-bis (3,4-dimethylbenzylidene) sorbitol) and MDBS(1,3:2,4-bis (4-methylbenzylidene) sorbitol) comprising the following steps:
- preparing a quaternary ammonium salt based ionic fluid;
- carrying out a dehydrocondensation reaction by adding an aldehyde and an alditol in a mole ratio of 2:1 in the ionic fluid under continuous stirring to form a reaction mixture;
- stirring the resultant reaction mixture to maintain the contents in a suspension form;
- and
- discontinuing the stirring of the reaction mixture to allow the mass formed in the reaction mixture to settle and separating the supernatant ionic fluid containing mother liquor;
- isolating and purifying the mass by filtering, washing and drying to obtain an acetal derivative without any free acid residue present therein.
A process as claimed in 2, wherein the solvent is at least one selected from the group of carboxylic acids, amides, alcohols, amines, ketones (aldehydes), asters, alkyl halides, ethers, aromatics (methanol, ethanol, propan-1-ol, propan-2-ol, 1-butanol, isobutanol, 2-butanol, tert-butanol, dichloromethane, tetrahydrofuran, methyl acetate, ethyl acetate, acetone, dimethylformamide, acetonitrile, dimethyl sulfoxide, formic acid, acetic acid, methyl ethyl ketone, dimethyl carbonate, diethyl ketone, acetic anhydride, acetone, tert-butyl methyl ether, diethyl amine, diethylene glycol, N,N-dimethylacetamide, diethylene glycol dimethyl ether, ethylene glycol dimethyl ether, ethylene glycol, glycerin, hexamethylphosphor amide, hexamethylphosphorous triamide, isoamyl alcohol, 2-methoxyethanol, 2-methoxyethyl acetate, 1-methyl-2-pyrrolidinone, nitromethane, propanoic acid, pyridine, hydrogen fluoride, hydrogen chloride) and water.
A process for preparation of acetal derivatives selected from the group consisting of DMDBS (1,3:2,4-bis (3,4-dimethylbenzylidene) sorbitol) and MDBS(1,3:2,4-bis (4-methylbenzylidene) sorbitol) comprising the following steps:
- preparing a quaternary ammonium salt based ionic liquid;
- carrying out a dehydrocondensation reaction by adding an aldehyde and an alditol in a mole ratio of 2:1 in the ionic liquid under continuous stirring to form a reaction mixture;
- stirring the resultant reaction mixture to maintain the contents in a suspension form;
- and
- discontinuing the stirring of the reaction mixture to allow the mass formed in the reaction mixture to settle and separating the supernatant mother liquor containing the ionic liquid;
- isolating and purifying the mass by filtering, washing and drying to obtain an acetal derivative without any free acid residue present therein.
Dependencies are inferred from the claim text.