The Multi Pressure vacuum distillation has many advantages over conventional distillation atmospheric distillation plants like lower energy requirement, very good quality alcohol and less scaling of the distillation trays due to sludge. The vacuum distillation produces ethanol of international quality standards and there is a lot of demand of ethanol from the vacuum distillation process.
Ethanol produced from this latest technology will meet most of the international quality standards for ethanol like US Pharmacopoeia, British Pharmacopoeia and Japanese standards. The vacuum distillation approximately requires 50 % less steam as compared with the conventional old distillation technologies. The vacuum distillation consists of distillation columns with high efficiency column trays, condensers, Reboilers, vacuum pumps and reflux pumps. A closed loop cooling tower system with an induced draft-cooling tower with circulation pumps is also provided to ensure higher cooling efficiency and to minimize water wastages. In this vacuum distillation alcohol is separated and concentrated using principal of fractional distillation. This is based on difference in boiling points of volatile compounds in mixture. There are 3 distillation columns in the system Primary column also called Mash column, Degasser column, Rectifier column, Dealdehyde Column. Final Rs draw taken from the top of the Rectifier column and send to the MSDH section for production of absolute alcohol or directly send to the storage section.