Procedure for producing hydroquinone
    8.
    发明授权
    Procedure for producing hydroquinone 失效
    生产氢醌的方法

    公开(公告)号:US4801758A

    公开(公告)日:1989-01-31

    申请号:US51736

    申请日:1987-05-18

    CPC分类号: C07C37/08

    摘要: A procedure for producing hydroquinone from a hydrocarbon mixture obtained as a by-product when producing cumene, by selectively oxidizing tertiary alkylaromatics to form hydroperoxides, by separating the dihydroperoxide of p-diisopropylbenzene from the oxidation product by selective crystallization through cooling, and by decomposing the dihydroperoxide of p-diisopropylbenzene with the aid of an acid catalyst to form the hydroquinone.

    Process for preparing and purifying complex esters
    10.
    发明授权
    Process for preparing and purifying complex esters 失效
    制备和纯化复合酯的方法

    公开(公告)号:US06362362B1

    公开(公告)日:2002-03-26

    申请号:US09402329

    申请日:1999-10-04

    IPC分类号: C07C6700

    CPC分类号: C07C67/60 C07C69/50 C07C69/44

    摘要: The invention concerns a process for manufacturing polyol complex esters. According to the method, a polyol, such as BEPD or NPG, is reacted with mono- and polyvalent acids in the presence of a catalyst to produce a reaction blend containing complex esters. According to the invention the acid components of the reaction blend are neutralized with a tertiary amine, and the complex esters are recovered from the thus treated reaction blend. The basic amines that are used form salt-like compounds with the carboxylic acids. The compounds enter the aqueous phase, from which they are easily separated, whereby the complex esters are recovered with high yield.

    摘要翻译: 本发明涉及制备多元醇复合酯的方法。 根据该方法,多元醇如BEPD或NPG在催化剂的存在下与单价和多价酸反应以产生含有复合酯的反应混合物。 根据本发明,用叔胺中和反应混合物的酸组分,并从如此处理的反应混合物中回收络合酯。 使用的碱性胺与羧酸形成盐状化合物。 化合物进入水相,从中容易分离,由此以高产率回收络合酯。