Method for producing high purity terephthalic acid
    1.
    发明授权
    Method for producing high purity terephthalic acid 有权
    生产高纯对苯二甲酸的方法

    公开(公告)号:US07262323B2

    公开(公告)日:2007-08-28

    申请号:US10574273

    申请日:2004-09-30

    IPC分类号: C07C51/16 C07C17/093 A61L9/00

    摘要: A method for producing high purity terephthalic acid wherein a slurry having an acetic acid solvent and, dispersed therein, crude terephthalic acid crystals which has been prepared by subjecting a p-alkyl benzene to a liquid phase oxidation in a solvent of acetic acid is continuously converted to a water slurry by the mother liquid exchange, and then the resultant water slurry is subjected to a hydrogenation treatment, which comprises introducing the above acetic acid slurry to a tower having a center axis having a plurality of agitating blades at the top thereof, to form a region having a high concentration of terephthalic acid crystals in the tower through the sedimentation of the terephthalic acid crystals, supplying the water for substitution to the bottom of the tower in such a manner to form an upward water flow while generating a revolving flow of the high concentration region by the rotation of the agitation blade, to thereby subject said terephthalic acid crystals and said upward water flow to a counter-flow contact, and taking out the acetic acid from a portion being upper than the supply port for the acetic acid slurry while withdrawing the terephthalic acid crystals having contacted with the upward water flow together with the water for substitution from the tower bottom. The above method allows the substitution of the acetic acid solvent of the acetic acid slurry with water, with a high substitution percentage.

    摘要翻译: 一种生产高纯度对苯二甲酸的方法,其中将具有乙酸溶剂和分散在其中的粗对苯二甲酸晶体的浆料在乙酸的溶剂中经由对烷基苯进行液相氧化而制备, 通过母液交换到水浆中,然后对所得水浆进行氢化处理,其包括将上述乙酸浆料引入到其顶部具有多个搅拌叶片的中心轴的塔上,至 通过对苯二甲酸晶体的沉降在塔中形成具有高浓度对苯二甲酸晶体的区域,将水替代为塔的底部,以形成向上的水流,同时产生 通过搅拌叶片的旋转而产生高浓度区域,从而使所述对苯二甲酸晶体和所述上部流动 ard水流动到逆流接触,并从乙酸浆料供应口上方的一部分取出乙酸,同时将与向上的水接触的对苯二甲酸晶体与水一起取出,以供替代 塔底。 上述方法允许乙酸溶剂的乙酸溶液用水替代,取代率高。

    Process for producing a hydrogenation product of an aromatic carboxylic acid
    3.
    发明授权
    Process for producing a hydrogenation product of an aromatic carboxylic acid 失效
    制备芳族羧酸的氢化产物的方法

    公开(公告)号:US06541662B2

    公开(公告)日:2003-04-01

    申请号:US10021430

    申请日:2001-12-19

    IPC分类号: C07C6109

    摘要: A process for producing a hydrogenation product of aromatic carboxylic acid which comprises continuously producing the hydrogenation product of aromatic carboxylic acid by hydrogenating an aromatic carboxylic acid having a melting point of 250° C. or higher in a solvent in the presence of a solid catalyst, wherein the hydrogenation is conducted in a condition such that substantially the entire amount of the aromatic carboxylic acid of a raw material is dissolved in the solvent by recycling a portion of a reaction liquid taken out of a reactor into the reactor. An aromatic carboxylic acid having a high melting point and hardly soluble in solvents can be hydrogenated at a suitable reaction temperature in accordance with a continuous process without using a great amount of a solvent and the reaction product of the object compound can be produced very efficiently.

    摘要翻译: 一种芳族羧酸的氢化产物的制造方法,其特征在于,在固体催化剂存在下,通过在溶剂中氢化熔点为250℃以上的芳香族羧酸,连续制造芳香族羧酸的氢化物, 其特征在于,氢化反应是将从反应器中取出的反应液的一部分再循环到反应器中,将原料的芳香族羧酸的总量全部溶解在溶剂中的方式进行。 可以在不使用大量溶剂的情况下,根据连续方法在合适的反应温度下氢化不溶于溶剂的高熔点,并且可以非常有效地制备目标化合物的反应产物。

    Process for producing dimethyl 2,6-naphthalene-dicarboxylate
    4.
    发明授权
    Process for producing dimethyl 2,6-naphthalene-dicarboxylate 失效
    2,6-萘二甲酸二甲酯的制备方法

    公开(公告)号:US5436364A

    公开(公告)日:1995-07-25

    申请号:US263466

    申请日:1994-06-22

    IPC分类号: C07C67/08 C07C69/76

    CPC分类号: C07C67/08

    摘要: A process for producing dimethyl 2,6-naphthalene-dicarboxylate by reacting 2,6-naphthalene-dicarboxylic acid with methanol which comprises effecting the reaction at 200.degree. to 350.degree. C. in the presence of trimethyl trimellitate as an essential solvent and optionally, at least one solvent selected from methyl benzoate, methyl toluate and dimethyl o-phthalate preferably by at least two-stage continuous reaction method. The above process is capable of enhancing the rate of esterification reaction and producing purified objective product in high yield for a long period of time in a stable operation without causing any operational trouble such as corrosion and clogging the production equipment.

    摘要翻译: 2,6-萘二甲酸与甲醇的反应生产2,6-萘二甲酸二甲酯的方法,该方法包括在偏苯三酸三甲酯作为必需溶剂存在下,在200-350℃下进行反应, 至少一种选自苯甲酸甲酯,甲基甲酸甲酯和邻苯二甲酸二甲酯的溶剂优选通过至少两步连续反应方法。 上述方法能够在稳定的操作中长时间提高酯化反应速率和高产率纯化的目标产物,而不会引起任何操作故障,例如腐蚀和堵塞生产设备。

    Method of manufacturing porous glass base material used for optical fibers, and glass base material
    8.
    发明申请
    Method of manufacturing porous glass base material used for optical fibers, and glass base material 有权
    制造用于光纤的多孔玻璃基材的方法和玻璃基材

    公开(公告)号:US20070163300A1

    公开(公告)日:2007-07-19

    申请号:US10583971

    申请日:2004-12-28

    申请人: Hiroshi Machida

    发明人: Hiroshi Machida

    摘要: The method of manufacturing porous glass base material for optical fiber includes that flame-hydrolyzing raw materials for glass in oxyhydrogen flame, depositing the generated glass fine particles on a rotating target to form porous glass base material, dehydrating and sintering the porous glass base material to transform into clear glass. The method features, in terms of the surface temperature of said porous glass base material, which changes as the burner used for depositing glass fine particle is moved relatively to said target, the temperature difference between the surface temperature of the porous glass base material touching the burner flame Ta and the surface temperature of the porous glass base material before touching the flame Tb, that is Ta−Tb, is adjusted to be within the range from 200 to 700 degrees centigrade.

    摘要翻译: 制造光纤用多孔玻璃基材的方法包括在氢氧火焰中火焰水解玻璃原料,将生成的玻璃微粒沉积在旋转靶上,形成多孔玻璃基材,将多孔玻璃基材脱水并烧结 变成透明玻璃。 该方法的特征在于,当用于沉积玻璃微粒的燃烧器相对于所述靶移动时,随着所述多孔玻璃基材的表面温度的变化,多孔玻璃基材的表面温度接触到 燃烧器火焰Ta和接触火焰Tb(即Ta-Tb)之前的多孔玻璃基材的表面温度被调节在200至700摄氏度的范围内。

    Method for producing high purity terephthalic acid
    9.
    发明申请
    Method for producing high purity terephthalic acid 有权
    生产高纯对苯二甲酸的方法

    公开(公告)号:US20070015935A1

    公开(公告)日:2007-01-18

    申请号:US10574273

    申请日:2004-09-30

    摘要: In the process for producing a high-purity terephthalic acid of the invention, a slurry of crude terephthalic acid crystals dispersed in an acetic acid solvent, which is produced by a liquid-phase oxidation of p-alkylbenzene in the acetic acid solvent, is continuously converted into a slurry in water by a mother liquor displacement and then subjected to a catalytic hydrogenation. The acetic acid solvent slurry is introduced into a column equipped with a central shaft having a plurality of stirring blades along a vertical direction thereof from an upper portion of the column. The crude terephthalic acid crystals are allowed to sediment to form a high-concentration zone of terephthalic acid crystals in the column. A displacing water is fed into the column from a bottom portion thereof so as to form an upward flow of water in the column while forming circular flows in the high-concentration zone by rotation of the stirring blades, thereby bringing the terephthalic acid crystals into counter-current contact with the upward flow of water. The terephthalic acid crystals after counter-current contact with the upward flow of water is discharged from a bottom portion of the column together with the displacing water, while simultaneously taking the acetic acid solvent out of a portion of the column disposed above a feed portion for introducing the acetic acid solvent slurry. By the process, the acetic acid solvent of the acetic acid slurry is displaced by water in a high degree of mother liquor displacement.

    摘要翻译: 在本发明的高纯度对苯二甲酸的制造方法中,在乙酸溶剂中通过液相氧化对 - 烷基苯生成的分散在乙酸溶剂中的粗对苯二甲酸晶体的浆液连续地 通过置换母液在水中转化为浆液,然后进行催化氢化。 将乙酸溶剂浆料从柱的上部沿其垂直方向引入装备有具有多个搅拌叶片的中心轴的塔中。 使粗对苯二甲酸晶体沉淀,形成柱中对苯二甲酸晶体的高浓度区。 置换水从其底部进料到塔中,以便在塔中形成向上的水流,同时通过搅拌叶片的旋转在高浓度区域形成圆形流动,从而使对苯二甲酸晶体反向 - 与水的向上流动接触。 与向上流动的水逆流接触的对苯二甲酸晶体与置换水一起从塔的底部排出,同时从设置在进料部分上方的塔的一部分中取出乙酸溶剂 引入乙酸溶剂浆液。 通过该过程,乙酸浆液的乙酸溶剂被高度母液置换的水置换。

    Method of washing solid grain
    10.
    发明申请
    Method of washing solid grain 失效
    洗涤固体颗粒的方法

    公开(公告)号:US20060254622A1

    公开(公告)日:2006-11-16

    申请号:US10571015

    申请日:2004-09-30

    IPC分类号: B08B9/20

    摘要: In the washing process of the invention, the solid particles in a high-concentration zone, which is formed in a washing tank by a gravitational sedimentation of solid particles, are continuously washed by a counter-current contact with upward flow of a washing liquid which is fed from the bottom portion of the washing tank. With this process, the impurities in the solid particles are sufficiently removed by a simple apparatus. Since the used washing liquid can be recycled as the disperse medium for feeding the solid particles and as the washing liquid, the amount of used washing liquid to be discharged as the waste from the system is reduced.

    摘要翻译: 在本发明的洗涤方法中,通过固体颗粒的重力沉降形成在洗涤槽中的高浓度区域中的固体颗粒通过与向上流动的洗涤液的逆流接触而连续洗涤, 从洗涤槽的底部进料。 通过这种方法,通过简单的装置将固体颗粒中的杂质充分除去。 由于所使用的洗涤液可以作为用于供给固体颗粒的分散介质再循环,并且作为洗涤液,因此作为废物从系统排出的废洗涤液的量减少。