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    • 4. 发明授权
    • Process for the separation of polyurethane foam hydrolysates into polyol
and diamine
    • 将聚氨酯泡沫水解物分离成多元醇和二胺的方法
    • US4282367A
    • 1981-08-04
    • US105059
    • 1979-12-19
    • Georg NiederdellmannNorbert RoemerErnst Grigat
    • Georg NiederdellmannNorbert RoemerErnst Grigat
    • C08G18/00C08G18/82C08J11/16C08G18/48C08G18/14
    • C08J11/16C08J2375/04Y02W30/705Y10S521/914
    • The instant invention is directed to a process for the separation of polyurethane hydrolysates into polyamines and polyols which can be used again for the production of polyurethanes, comprising introducing gaseous hydrogen chloride into the hydrolysate mixture which has optionally been diluted with an inert solvent, and removing the precipitated amine salt by filtration, characterized in that(a) gaseous hydrogen chloride is optionally first introduced into the hydrolysate in a quantity of from 0.02 to 0.07 mol per amine equivalent, the reaction mixture is filtered and the filter residue is discarded, then(b) from 0.20 to 0.47 mol of gaseous hydrogen chloride per mol of amine equivalents still present is introduced into the filtrate and the precipitated amine salt is filtered off, then(c) stage (b) is repeated one or more times until the amine group content in the filtrate is below 1% by weight, based on the solvent-free filtrate, and finally(d) precipitation of the amine is completed by the introduction of from 0.5 to 1.0 mol of gaseous hydrogen chloride, based on the amine equivalents remaining in the filtrate.
    • 本发明涉及将聚氨酯水解物分离成多胺和多元醇的方法,其可以再次用于生产聚氨酯,包括将气态氯化氢引入到任选用惰性溶剂稀释的水解产物混合物中,并除去 通过过滤沉淀的胺盐,其特征在于,(a)气态氯化氢任选地首先以每个胺当量为0.02至0.07mol的量引入水解产物中,将反应混合物过滤并弃去过滤残余物,然后( b)将0.20至0.47摩尔的气态氯化氢/摩尔仍存在的胺当量引入滤液中,滤出沉淀的胺盐,然后(c)重复步骤(b)一次或多次,直至胺基 基于无溶剂的滤液,滤液中的含量低于1重量%,最后(d)胺的沉淀完全 通过根据残留在滤液中的胺当量,从0.5至1.0mol的气态氯化氢引入。