PROCESS FOR CONTINUOUSLY PREPARING COPOLYAMIDES FR

专利名称：PROCESS FOR CONTINUOUSLY PREPARING

COPOLYAMIDES FROM LACTAMS ANDSALTS OF DIAMINES AND DICARBOXYLICACIDS

发明人：PLACHETTA, Christoph,GERSTLAUER,

Achim,LANG, Reinhard,SAUER,Thomas,BECKER, Jens

申请号：EP09765113.7申请日：20091209公开号：EP2376557B1公开日：20170405

摘要：A process for continuously preparing copolyamides from lactams and salts ofdiamines and dicarboxylic acids, in which lactams together with salts of diamines anddicarboxylic acids are passed from the top downward through a vertical polymerizationtube at polyamide-forming temperatures, which comprises a) intensively mixing anaqueous solution of lactams with salts of diamines and dicarboxylic acids under elevatedpressure which is greater than the vapor pressure of the mixture which arises in a mixingapparatus at a temperature of from 80 to 300° C., b) feeding the mixture thus obtained toa heated helical tube evaporator in which a liquid phase and a vapor phase form at atemperature of from 140 to 300° C., a stream of water vapor and/or inert gas also beingintroduced into the mixture if appropriate upstream of the helical tube, c) removing thevapor phase formed in stage b) from the liquid phase and separating it in a column intowater vapor and into organic components comprising diamines, dicarboxylic acids and

lactams, and recycling the organic components into the polymerization, d) passing theliquid phase from the helical tube of stage b) mixed with the organic components ofstage c) from the top downward through a vertical polymerization tube at polyamide-forming temperatures to obtain a copolyamide.

申请人：BASF SE,BASF SE,BASF SE

地址：DE

国籍：DE

代理机构：BASF IP Association

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