申请人:Fukuoka Shinsuke
公开号:US20090105494A1
公开(公告)日:2009-04-23
It is an object of the present invention, when producing a dialkyl carbonate and a diol industrially in a large amount (e.g. not less than 2 ton/hr for the dialkyl carbonate and not less than 1.3 ton/hr for the diol) through a reactive distillation system of taking a cyclic carbonate and an aliphatic monohydric alcohol as starting materials, continuously feeding the starting materials into a continuous multi-stage distillation column in which a catalyst is present, and carrying out reaction and distillation simultaneously in the column, is to provide a specific process that enables the dialkyl carbonate and the diol to be produced each with high selectivity and high productivity stably for a prolonged period of time (e.g. not less than 1000 hours, preferably not less than 3000 hours, more preferably not less than 5000 hours), and moreover enables the dialkyl carbonate produced to be separated out and purified stably for a prolonged period of time with high efficiency. It has been discovered that by carrying out reactive distillation using a continuous multi-stage distillation column A having a specified structure, and subjecting a column top component A
T
thus obtained to separation by distillation using a continuous multi-stage distillation column B having a specified structure, a dialkyl carbonate of high purity (e.g. not less than 97%, preferably not less than 99%, more preferably not less than 99.9%, yet more preferably not less than 99.99%) and a diol can be produced each with a high selectivity of not less than 95%, preferably not less than 97%, more preferably not less than 99%, on an industrial scale of not less than 2 ton/hr, preferably not less than 3 ton/hr, more preferably not less than 4 ton/hr, for the dialkyl carbonate, and not less than 1.3 ton/hr, preferably not less than 1.95 ton/hr, more preferably not less than 2.6 ton/hr, for the diol, with a high yield stably for a prolonged period of time of not less than 1000 hours, preferably not less than 3000 hours, more preferably not less than 5000 hours, from a cyclic carbonate and an aliphatic monohydric alcohol.
本发明的目的是在通过采用环碳酸酯和脂肪族一元醇作为起始原料,在连续多级蒸馏塔中连续供给起始原料,其中存在催化剂,并在该塔中同时进行反应和蒸馏的反应蒸馏系统中,工业化大量生产二烷基碳酸酯和二元醇(例如,二烷基碳酸酯不少于2吨/小时,二元醇不少于1.3吨/小时),提供一种特定的工艺,使得二烷基碳酸酯和二元醇能够在较长时间内(例如,不少于1000小时,最好不少于3000小时,更好不少于5000小时)具有高选择性和高生产率稳定地生产,并且使得生产的二烷基碳酸酯能够在较长时间内以高效率稳定地分离和纯化。发现通过采用具有特定结构的连续多级蒸馏塔A进行反应蒸馏,并将由此获得的塔顶组分AT经由具有特定结构的连续多级蒸馏塔B进行蒸馏分离,可以在不少于2吨/小时的工业规模上,对二烷基碳酸酯和二元醇分别具有不低于95%的高选择性(最好不低于97%,更好不低于99%),对于二烷基碳酸酯,产量不低于2吨/小时,最好不低于3吨/小时,更好不低于4吨/小时,对于二元醇,产量不低于1.3吨/小时,最好不低于1.95吨/小时,更好不低于2.6吨/小时,能够在不少于1000小时的较长时间内稳定地高产。