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    Process for producing aromatic carboxylic acid
    1.
    发明授权
    Process for producing aromatic carboxylic acid 失效
    芳香族羧酸的制造方法

    公开(公告)号：US06506931B1

    公开(公告)日：2003-01-14

    申请号：US09656997

    申请日：2000-09-07

    申请人： Masayasu Ishibashi ,  Hiroshi Tomita

    发明人： Masayasu Ishibashi ,  Hiroshi Tomita

    IPC分类号： C07C51255

    CPC分类号： C07C51/265 ,  C07C63/26

    摘要： A process for producing an aromatic carboxylic acid by a liquid phase oxidation of an alkylaromatic compound with molecular oxygen in a reaction solvent comprising a lower aliphatic carboxylic acid in the presence of an oxidation catalyst, in which an aromatic carboxylic acid having an improved hue of the powdery product thereof and exhibiting an improved light transmittance when dissolved in an aqueous solution of a base can be produced efficiently in a simple manner by suppressing contamination due to the intermediates and by-products formed by side reactions, the said process comprising performing the liquid phase oxidation of the alkylaromatic compound in the presence of a hydrogen gas-treated liquid containing the catalyst.

    摘要翻译： 在氧化催化剂存在下，通过在含有低级脂肪族羧酸的反应溶剂中通过烷基芳族化合物与分子氧进行液相氧化来制备芳族羧酸的方法，其中具有改进的色调的芳族羧酸 通过抑制由副反应形成的中间体和副产物引起的污染，可以以简单的方式有效地制备溶解在碱的水溶液中时提高其透光度的粉末状产物，所述方法包括进行液相 在含有催化剂的氢气处理液体存在下，烷基芳族化合物的氧化。

    Process for production of aromatic carboxylic acids with improved water removal technique
    2.
    发明授权
    Process for production of aromatic carboxylic acids with improved water removal technique 有权
    改进除水技术生产芳香族羧酸的方法

    公开(公告)号：US06504051B1

    公开(公告)日：2003-01-07

    申请号：US09873723

    申请日：2001-06-04

    申请人： Harold David Miller, Jr. ,  Robert Lin ,  Marcel de Vreede

    发明人： Harold David Miller, Jr. ,  Robert Lin ,  Marcel de Vreede

    IPC分类号： C07C51255

    CPC分类号： C07C51/265 ,  C07C63/26 ,  C07C63/24

    摘要： Disclosed is an improved process for the continuous production of aromatic carboxylic acids by the liquid-phase oxidation of an alkyl aromatic compound with an oxygen-containing gas in the presence of oxidation catalyst which results in reduced wastewater generation, reduced condensing capacity requirements, and, optionally, increased power recovery, and. The process effectively utilizes the heat of reaction in the process of removing excess water generated from the reaction and minimizes the loss of solvent used as the carrier for the reaction catalyst by removing reactor off-gas directly into a water removal column for distillation. A portion of the overhead aqueous vapors are removed from the top of the water removal column as a vapor distillate, with the remaining overhead aqueous vapors being condensed then subsequently refluxed to the fractionating zone of the water removal column. In a preferred embodiment, the combined vapor distillate and oxygen-depleted process gas are reduced to a low pressure through a power recovery device for improved process efficiency, and then fed to a pollution control device for the destruction of organic compounds before exiting the process.

    摘要翻译： 公开了一种通过在氧化催化剂的存在下通过含氧气体的烷基芳族化合物的液相氧化来连续生产芳族羧酸的改进方法，其导致减少的废水产生，降低的冷凝能力要求， 可选地，增加功率恢复，和。 该过程在除去反应产生的过量水的过程中有效地利用了反应热，并且通过将反应器废气直接除去用于蒸馏的除水塔来最小化用作反应催化剂的载体的溶剂的损失。 塔顶水蒸气的一部分作为蒸汽馏出物从除水塔的顶部除去，剩余的塔顶水蒸汽冷凝，随后回流到除水塔的分馏区。 在一个优选的实施方案中，通过动力回收装置将组合的蒸汽馏出物和贫氧处理气体还原成低压，以提高处理效率，然后在退出该过程之前进入污染控制装置以破坏有机化合物。