Method for purifying crude naphthalenedicarboxylic acid
    4.
    发明授权
    Method for purifying crude naphthalenedicarboxylic acid 失效
    粗萘二甲酸纯化方法

    公开(公告)号:US5872284A

    公开(公告)日:1999-02-16

    申请号:US860622

    申请日:1997-07-09

    CPC分类号: C07C51/487

    摘要: The invention provides a method for purifying a crude naphthalenedicarboxylic acid comprising the steps of mixing a crude naphthalenedicarboxylic acid and a water/alcohol solvent to esterify a part of the naphthalenedicarboxylic acid, thereby dissolving a naphthalenedicarboxylic ester into the solvent, and then contacting the resulting reaction mixture with hydrogen in the presence of a hydrogenation catalyst to hydrogenate impurities which are contained in the crude naphthalenedicarboxylic acid and which are capable of being hydrogenated, thereby dissolving and removing hydrogenation products into the water/alcohol solvent. A mixture of a naphthalene dicarboxylic acid and a naphthalenedicarboxylic ester with reduced impurity contents, or a high-purity naphthalenedicarboxylic acid can be obtained.

    摘要翻译: PCT No.PCT / JP96 / 03180 Sec。 371日期1997年7月9日第 102(e)日期1997年7月9日PCT提交1996年10月30日PCT公布。 第WO97 / 17318号公报 日期:1997年5月15日本发明提供了一种纯化萘二甲酸粗品的方法,包括将粗萘二甲酸与水/醇溶剂混合以使部分萘二甲酸酯化,从而将萘二甲酸酯溶解在溶剂中,然后 使所得反应混合物与氢气在氢化催化剂存在下接触,氢化含有粗萘二甲酸的杂质,并能够被氢化,从而将氢化产物溶解并除去到水/醇溶剂中。 可以获得具有降低的杂质含量的萘二甲酸和萘二甲酸酯的混合物或高纯度萘二甲酸。

    Process for producing polyethylene naphthalate
    5.
    发明授权
    Process for producing polyethylene naphthalate 失效
    生产聚萘二甲酸乙二醇酯的方法

    公开(公告)号:US5811513A

    公开(公告)日:1998-09-22

    申请号:US860701

    申请日:1997-07-09

    摘要: In the production of polyethylene naphthalate of the present invention, the esterification reaction between naphthalenedicarboxylic acid and ethylene glycol is conducted while causing water to be present in a reaction system from a start of reaction, in the presence of at least one catalyst selected from the group consisting of nitric, carboxylic, phosphoric and hydrogenphosphoric acid metal salts and alkyl amines according to necessity, to thereby attain an esterification ratio of 45 to 80%, so that a liquid mixture of naphthalenedicarboxylic acid esterification reaction products containing naphthalenedicarboxylic acid, carboxyl-hydroxyethoxycarbonylnaphthalene and bis(hydroxyethoxycarbonyl)naphthalene is obtained. Subsequently, a crystallized reaction product is separated from this liquid mixture to thereby obtain a mixture of esterification reaction products. Thereafter, this mixture having ethylene glycol added thereto according to necessity is subjected to polycondensation. The polyethylene naphthalate obtained by the process of the present application ensures a low content of naphthalenedicarboxylic acid esters each having diethylene glycol skeleton therein, thereby having excellent quality, for example, in appearance.

    摘要翻译: PCT No.PCT / JP96 / 03116 Sec。 371日期1997年7月9日第 102(e)日期1997年7月9日PCT 1996年10月25日PCT公布。 公开号WO97 / 17391 日期1997年5月15日在本发明的聚萘二甲酸乙二醇酯的制造中,在反应开始时,在存在至少一种催化剂的同时,使反应体系中存在水,进行萘二甲酸与乙二醇的酯化反应 根据需要选自硝酸,羧酸,磷酸和氢磷酸金属盐和烷基胺,从而达到45-80%的酯化比,使得含萘二羧酸的萘二甲酸酯化反应产物的液体混合物, 羧基 - 羟基乙氧基羰基萘和双(羟基乙氧基羰基)萘。 随后,从该液体混合物中分离出结晶的反应产物,由此得到酯化反应产物的混合物。 然后,将根据需要添加有乙二醇的混合物进行缩聚。 通过本申请的方法获得的聚萘二甲酸乙二醇酯确保了在其中具有二甘醇骨架的低含量的萘二羧酸酯,从而具有优异的质量,例如外观。

    SPEAKER RETENTION BRACKET AND METHOD
    10.
    发明申请
    SPEAKER RETENTION BRACKET AND METHOD 有权
    扬声器保持支架和方法

    公开(公告)号:US20080310668A1

    公开(公告)日:2008-12-18

    申请号:US11763774

    申请日:2007-06-15

    IPC分类号: H04R1/02

    摘要: An audio speaker bracket for use in passenger vehicles and a method for installing the speaker to a mounting panel using at feast one suspension member. The method permits the speaker to be temporarily supported by a mounting panel while secure attachment of the bracket to the mounting panel is completed.

    摘要翻译: 用于乘客车辆的音频扬声器支架以及使用一个悬挂构件将扬声器安装到安装面板的方法。 该方法允许扬声器由安装面板临时支撑,同时完成将支架固定到安装面板上。