Process for producing aromatic amines
    33.
    发明授权
    Process for producing aromatic amines 失效
    生产芳香胺的方法

    公开(公告)号:US5808157A

    公开(公告)日:1998-09-15

    申请号:US511165

    申请日:1995-08-04

    CPC分类号: C07C209/36

    摘要: Aromatic amines are produced by hydrogenation of the associated aromatic nitro compounds in the gas phase over fixed catalysts. The catalysts contain active hydrogenation metals on supports. The reaction is conducted at a pressure of 2-50 bar and at a temperature in the range 250.degree.-500.degree. C. under adiabatic conditions. A circulating gas is passed over the catalyst, which circulating gas contains 3-150 moles of hydrogen, 2-100 moles of the amino groups to be formed per mole of nitro groups, and 2 to 6 moles of water per amino group equivalent. The amine and water formed, as well as a purification stream, are separated from the circulating gas. Thereafter the circulating gas is enriched with volatilised aromatic nitro compound and fresh hydrogen and recycled.

    摘要翻译: 通过在气相中通过固定催化剂氢化相关联的芳族硝基化合物来生产芳族胺。 催化剂在载体上含有活性氢化金属。 反应在绝热条件下,在2-50巴的压力和250-500℃的温度下进行。 循环气体通过催化剂,循环气体含有3-150摩尔氢,每摩尔硝基形成2-100摩尔氨基和每个氨基当量2-6摩尔水。 所形成的胺和水以及净化物流与循环气体分离。 此后,循环气体富含挥发的芳​​香硝基化合物和新鲜氢气并再循环。

    Process for preparing aryl carbonates
    35.
    发明授权
    Process for preparing aryl carbonates 失效
    制备芳基碳酸酯的方法

    公开(公告)号:US5473094A

    公开(公告)日:1995-12-05

    申请号:US271488

    申请日:1994-07-07

    CPC分类号: C07C68/02

    摘要: Carbonates with aromatic ester groups may be prepared by reacting aromatic monohydroxy compounds with phosgene or with chloroformates of aromatic monohydroxy compounds, wherein reaction takes place at a temperature in the range 50.degree. to 350.degree. C. in the presence of aluminum oxides as heterogeneous catalysts.

    摘要翻译: 具有芳族酯基的碳酸酯可以通过使芳族单羟基化合物与光气或芳族单羟基化合物的氯甲酸酯反应制备,其中在作为多相催化剂的氧化铝存在下,在50℃至350℃的温度下进行反应。

    Process for the preparation of alkylene carbonates
    36.
    发明授权
    Process for the preparation of alkylene carbonates 失效
    制备碳酸亚烷基酯的方法

    公开(公告)号:US5391767A

    公开(公告)日:1995-02-21

    申请号:US976877

    申请日:1992-11-16

    CPC分类号: C07D317/38

    摘要: Alkylene carbonates can be prepared by catalytic reaction of alkylene oxides with carbon dioxide, catalysts which can be regenerated of the formulaa[MX]/b[ZnY.sub.2 ] (III)whereinM denotes an alkali metal,X and Y independently of one another denote chlorine, bromine or iodine anda and b denote fractions or integers in a range from 0.001 to 2being employed.The catalysts (III) can be regenerated by treating with a halogen compound. The halogen compounds which can be used for this purpose belong to the group comprising hydrogen halides, inorganic and organic acid halides, interhalogen compounds and organic halides with mobile halogen.

    摘要翻译: 碳酸亚烷基酯可以通过烯化氧与二氧化碳的催化反应制备,催化剂可以再生成式[MX] / b [ZnY 2](III),其中M表示碱金属,X和Y彼此独立地表示 氯,溴或碘,a和b表示使用0.001至2范围内的分数或整数。 催化剂(III)可以通过用卤素化合物处理再生。 可以用于此目的的卤素化合物属于包含卤化氢,无机和有机酰卤,卤间化合物和具有可移动卤素的有机卤化物的基团。