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    • 1. 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。
    • 2. 发明授权
    • Process for separating polyurethane hydrolyzates into polyether and
diamine
    • 将聚氨酯水解产物分离成聚醚和二胺的方法
    • US4399236A
    • 1983-08-16
    • US299418
    • 1981-09-04
    • Georg NiederdellmannNorbert RoemerJurgen SchenkHartmut HetzelErnst Grigat
    • Georg NiederdellmannNorbert RoemerJurgen SchenkHartmut HetzelErnst Grigat
    • C08G18/00C08G18/82C08J11/00C08J11/10C08J11/04C08G18/48
    • C08J11/10C08J2375/04Y02W30/702
    • The present invention is directed to a process for separating polyurethane hydrolyzates, preferably polyurethane foam hydrolyzates, into substantially amine-free foamable polyethers and diamines, comprising (a) (i) briefly expanding a hot polyurethane hydrolyzate obtained in a continuous screw extruder to normal pressure or in vacuo and, without using readily volatile components (ii) spraying said hydrolyzate directly into a tubular coil evaporator which is heated to 180.degree.-300.degree. C. and at the end of which a pressure of from 0.1 to 20 mbar is applied and (iii) separating a hydrolyzate containing less than 1% by weight of NH.sub.2 in a following cyclone from most of the diamine evaporated and all the solvent used, the diamine being separated from the solvent used in a following distillation column, optionally without any further heat input; (b) precipitating any diamine still present quantitatively in the form of its hydrochloride by introducing excess hydrogen chloride into the hydrolyzate, optionally diluted with inert solvents; and (c) the regenerated polyether obtained after removal by filtration of the precipitated amine salt being freed under reduced pressure from inert solvent and excess hydrogen chloride.
    • 本发明涉及将聚氨酯水解物(优选聚氨酯泡沫水解产物)分离成基本上不含胺的可发泡聚醚和二胺的方法,其包括(a)(i)将在连续螺杆挤出机中获得的热聚氨酯水解产物短暂膨胀至常压 或在真空中,并且不使用易挥发性组分(ii)将所述水解产物直接喷射到加热至180-300℃的管状线圈蒸发器中,并且其末端施加0.1至20mbar的压力, (iii)在以下旋风分离器中从大部分蒸发的二胺和所有使用的溶剂中分离含有小于1重量%的NH 2的水解产物,二胺与随后的蒸馏塔中使用的溶剂分离,任选没有任何进一步的热 输入 (b)通过将过量的氯化氢引入水解产物中,任选地用惰性溶剂稀释,沉淀出以其盐酸盐形式定量存在的任何二胺; 和(c)通过过滤除去沉淀的胺盐后得到的再生聚醚,在惰性溶剂和过量的氯化氢中减压除去。