公开(公告)号：US20140183028A1

公开(公告)日：2014-07-03

申请号：US14140679

申请日：2013-12-26

Applicant: BASF SE

Inventor： Christoph Sigwart ,  Jutta Vonend ,  Cornelis Hendricus De Ruiter ,  Annette Kreiner ,  Jörg Erbes ,  Tobias Kortekamp

IPC: B01D3/34

CPC classification number: B01D3/143

Abstract: A process is proposed for the treatment of a recycling stream (1) from a plant for the production of polyarylene ether sulfones via polycondensation of aromatic bishalogen compounds and of aromatic bisphenols or their salts in the presence of at least one alkali metal carbonate or ammonium carbonate or alkali metal hydrogencarbonate or ammonium hydrogencarbonate in an N-alkyl-2-pyrrolidone as solvent, comprising from 60 to 90% by weight of water, from 10 to 40% by weight of N-alkyl-2-pyrrolidone and, as contaminant detrimental to specification, up to 5000 ppm by weight of the alkylsuccinimide corresponding to the N-alkyl-2-pyrrolidone and, alongside this, up to 1000 ppm by weight of other substances with higher boiling point than N-alkyl-2-pyrrolidone, in particular inorganic salts, based in each case on the total weight of the recycling stream (1), where the entirety of the components gives 100% by weight, giving a pure N-alkyl-2-pyrrolidone stream (2) which can be returned to the plant for the production of polyarylene ether sulfones, via a final distillation in a final column (K), which comprises preceding the final distillation by a preliminary purification by evaporation in one or more evaporator stages for reducing the level of inorganic salts, where one or more vapor streams (3, 4, 5) are obtained which are supplied as feed streams to the final column (K), and where the bottom stream from the last evaporator stage is removed and the bottom stream from the final column (K) is supplied in part or in full to an additional column (K), in which it is separated into a bottom steam (11), which is removed, and into an overhead stream (12), which is recycled to the final column (K).

Abstract translation: 提出了一种方法，用于在至少一种碱金属碳酸盐或碳酸铵存在下，通过芳族双酚类化合物和芳族双酚或其盐的缩聚来处理来自植物的生产聚亚芳基醚砜的再循环料流（1） 或N-烷基-2-吡咯烷酮作为溶剂的碱金属碳酸氢盐或碳酸氢铵，包含60至90重量％的水，10至40重量％的N-烷基-2-吡咯烷酮和作为污染物的有害物质 相对于N-烷基-2-吡咯烷酮至多5000重量ppm的烷基琥珀酰亚胺，并且除此之外，高达1000重量ppm的沸点高于N-烷基-2-吡咯烷酮的其它物质，在 特定的无机盐，基于每种情况下的循环流（1）的总重量，其中全部组分给出100重量％，得到纯N-烷基-2-吡咯烷酮流（2），其可以返回 到pla nt用于生产聚芳醚砜，通过在最终塔（K）中进行最终蒸馏，其包括在最终蒸馏之前通过在一个或多个蒸发器阶段中蒸发的初步纯化以降低无机盐的水平，其中一个或 获得作为进料流供应到最终塔（K）的更多的蒸汽流（3,4,5），并且其中来自最后一个蒸发器级的底部流被除去并且来自最终塔（K）的底部流是 部分或全部供应到另外的塔（K），其中它被分离成被除去的底部蒸汽（11），并被再循环到最终塔（K）的塔顶物流（12）中， 。