Recovery of caprolactam from oligomers and/or polymers of caprolactam
    12.
    发明授权
    Recovery of caprolactam from oligomers and/or polymers of caprolactam 失效
    从己内酰胺的低聚物和/或聚合物中回收己内酰胺

    公开(公告)号:US5700358A

    公开(公告)日:1997-12-23

    申请号:US396623

    申请日:1995-03-01

    CPC classification number: C07D201/12 C07D201/16

    Abstract: Caprolactam is recovered from oligomers and/or polymers of caprolactam by cleavage of oligomers and/or polymers of caprolactam and subsequent working up by distillation of the caprolactam obtained in the cleavage, by a process including (a) cleaving oligomers and/or polymers of caprolactam to obtain an aqueous reaction mixture which contains caprolactam, (b) removing water from the reaction mixture obtained under (a) to obtain a residue, (c) distilling the residue obtained under (b) in an acidic medium and (d) then distilling the distillate in an alkaline medium to obtain caprolactam, or (c') distilling the residue obtained under (b) in an alkaline medium and (d') then distilling the distillate in an acidic medium to obtain caprolactam.

    Abstract translation: 通过裂解己内酰胺的低聚物和/或聚己内酯并随后通过蒸馏在切割中获得的己内酰胺来处理己内酰胺从己内酰胺的低聚物和/或聚合物中回收己内酰胺,方法包括(a)裂解己内酰胺的低聚物和/或聚合物 得到含有己内酰胺的水性反应混合物,(b)从(a)得到的反应混合物中除去水,得到残渣,(c)将酸性介质中的(b)得到的残渣蒸馏,然后蒸馏 在碱性介质中的馏出物得到己内酰胺,或(c')将在(b)获得的残余物在碱性介质中蒸馏,然后(d'),然后在酸性介质中蒸馏出馏出物,得到己内酰胺。

    Continuous Method for Producing a Lightweight Sandwich Panel and Lightweight Sandwich Panels Producible According to this Method
    15.
    发明申请
    Continuous Method for Producing a Lightweight Sandwich Panel and Lightweight Sandwich Panels Producible According to this Method 有权
    根据该方法生产轻质三明治板和轻质三明治板的连续方法

    公开(公告)号:US20150239146A1

    公开(公告)日:2015-08-27

    申请号:US14435597

    申请日:2013-10-14

    Abstract: The invention relates to: A) a continuous method for producing a lightweight sandwich panel having an upper and a lower cover layer made of pressed wood chips glued to one another, as well as an intermediate hard foam layer which is thick in relation to a cover layer, arranged between the cover layers and fixedly connected thereto, the method comprising the following steps: 1) providing a scattered layer of glue-coated woodchips; 2) pressing this layer and bonding the wood chips under pressure and temperature conditions typical of conventional chipboard production such that a high vapour pressure is built up in the centre between the cover layers; 3) relieving the pressure on the chipboard by moving the pressing surfaces away from one another, whereby the chipboard tears open in the centre due to the built-up vapour pressure and divides into two cover layers of equal thickness; 4) moving the cover layers apart such that an intermediate layer can be inserted; 5) introducing a hard foam system that can be foamed and cured to form a hard foam between the cover layers; 6) bringing the cover layers together to the nominal thickness of the lightweight sandwich panel to be produced and holding the pressure until the intermediate layer has finished reacting; and 7) finishing the lightweight sandwich panel. B) The invention further relates to a lightweight sandwich panel producible according to the method described in A), with a transition zone created by the uneven portions of the cover layers on the inner side, which are filled with the polyurethane hard foam.

    Abstract translation: 本发明涉及:A)一种用于制造轻质夹芯板的连续方法,该轻质夹心板具有由彼此粘合的压制木片制成的上盖层和下盖层,以及相对于盖板厚的中间硬质泡沫层 层,布置在覆盖层之间并且固定地连接到其上,该方法包括以下步骤:1)提供涂覆有涂层的木片的散射层; 2)挤压该层并在传统的刨花板生产典型的压力和温度条件下粘合木屑,使得在覆盖层之间的中心建立高蒸气压; 3)通过使按压表面彼此移动来减轻刨花板上的压力,由此由于积聚的蒸汽压力,刨花板在中心开裂,并分成两层相同的厚度; 4)将覆盖层分开移动,使得可以插入中间层; 5)引入可以发泡和固化以在覆盖层之间形成硬泡沫的硬泡沫体系; 6)将覆盖层合在一起制成待制造的轻质夹层板的标称厚度并保持压力直到中间层完成反应; 和7)整理轻巧的夹心板。 B)本发明还涉及一种根据A)中描述的方法生产的轻质夹层板,其中由内层的覆盖层的不均匀部分产生的过渡区填充有聚氨酯硬质泡沫。

    Preparation of 3-methylpiperidine
    20.
    发明授权
    Preparation of 3-methylpiperidine 失效
    3-甲基哌啶的制备

    公开(公告)号:US4755604A

    公开(公告)日:1988-07-05

    申请号:US062408

    申请日:1987-06-15

    CPC classification number: C07D295/023 B01J23/745

    Abstract: 5-Membered, 6-membered or 7-membered cyclic imines are prepared by hydrogenating a C.sub.2 -C.sub.4 -alkanedinitrile in the liquid phase, at from 180.degree. to 300.degree. C. and under superatmospheric pressure, in the presence of a catalyst, by a process in which an iron catalyst obtained by reduction of an iron oxide with hydrogen at .ltoreq.500.degree. C. is used.

    Abstract translation: 通过在液相中在180℃至300℃下和在超大气压下,在催化剂存在下,通过在催化剂存在下,通过将催化剂,C 2 -C 4烷基二醇, 使用通过在500℃下用氢还原氧化铁获得的铁催化剂的方法。

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