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    Process for preparing terephthalic acid of high quality
    2.
    发明授权
    Process for preparing terephthalic acid of high quality 失效
    制备高品质对苯二甲酸的方法

    公开(公告)号：US4877900A

    公开(公告)日：1989-10-31

    申请号：US177951

    申请日：1988-04-05

    申请人： Akio Tamaru ,  Yoshiaki Izumisawa

    发明人： Akio Tamaru ,  Yoshiaki Izumisawa

    IPC分类号： C07C63/26 ,  C07B61/00 ,  C07C51/265 ,  C07C51/487

    CPC分类号： C07C51/265

    摘要： The present invention provides a process of preparing terephthalic acid of high quality which is characterized by:oxidizing p-xylene with molecular oxygen in an acetic acid solvent in the presence of a catalyst comprised of at least one heavy metal and bromine at a temperature of from 180.degree. to 230.degree. C. to convert at least 95 wt % of the p-xylene into terephthalic acid and, optionally, subjecting the resultant reaction mixture to low temperature post-oxidation with molecular oxygen at temperatures lower than the temperature of the first oxidation reaction, thereby obtaining a slurry containing terephthalic acid particles whose spectral reflectance defined below is not less than 70% and whose reflectance ratio (400/500) defined below is not less than 0.92;subjecting the slurry to high temperature post-oxidation with molecular oxygen at a temperature of from 235.degree. to 290.degree. C. and then to crystallization; andcollecting the resultant terephthalic acid from the reaction mixture.Spectral reflectance=a spectral reflectance at 500 nm determined according to a white light illumination method.Reflectance ratio (400/500)=(spectral reflectance at 400 nm)/(spectral reflectance at 500 nm).

    摘要翻译： 本发明提供了一种高品质对苯二甲酸的制备方法，其特征在于：在由至少一种重金属和溴组成的催化剂存在下，在乙酸溶剂中，在分子氧下， 将至少95重量％的对二甲苯转化成对苯二甲酸，并且任选地使得到的反应混合物在低于第一次氧化温度的温度下用分子氧进行低温氧化 反应，得到含有下述光谱反射率为70％以上且其反射率（400/500）以下所定义的对苯二甲酸粒子的浆料为0.92以上的浆液。 在235〜290℃的温度下用分子氧对浆料进行高温后氧化，然后结晶; 并从反应混合物中收集所得对苯二甲酸。 光谱反射率=根据白光照明方法确定的500nm处的光谱反射率。 反射率（400/500）=（400nm处的光谱反射率）/（500nm处的光谱反射率）。

    Process for preparing terephthalic acid by the catalytic oxidation with air of p-xylene in a water containing acetic acid solvent
    3.
    发明授权
    Process for preparing terephthalic acid by the catalytic oxidation with air of p-xylene in a water containing acetic acid solvent 失效
    通过在含有乙酸溶剂的水中的对二甲苯的空气进行催化氧化制备对苯二甲酸的方法

    公开(公告)号：US4593122A

    公开(公告)日：1986-06-03

    申请号：US635264

    申请日：1984-07-27

    申请人： Hiroshi Hashizume ,  Yoshiaki Izumisawa

    发明人： Hiroshi Hashizume ,  Yoshiaki Izumisawa

    IPC分类号： C07C63/26 ,  B01J27/00 ,  B01J31/00 ,  C07B61/00 ,  C07C51/00 ,  C07C51/265 ,  C07C67/00

    CPC分类号： C07C51/265 ,  Y02P20/52

    摘要： A process for producing terephthalic acid from p-xylene continuously, wherein p-xylene is oxidized to terephthalic acid by air in the presence of a catalyst containing cobalt, manganese and bromine at a temperature of 180.degree. to 230.degree. C. in a water containing acetic acid solvent in which the concentration of oxygen gas contained in an exhaust gas obtained from the reaction vessel used for oxidizing p-xylene is 2 to 8% by volume, said process comprising, (a) preparing an oxidation exhaust gas by condensing a gas withdrawn from said reaction vessel for removing condensates from said gas, (b) dividing the prepared oxidation exhaust gas into a discharged gas and a recycled gas, in which the volume ratio of said recycled gas to said discharged gas is 0.3 to 5, said discharged gas being exhausted to the outside of the reaction system, (c) supplying continuously said recycled gas to the liquid phase of said reaction vessel, and (d) carrying out the oxidation reaction of p-xylene under reaction pressure higher than the pressure of the reaction system when gas is not recycled to the system.

    摘要翻译： 一种从对二甲苯连续生产对苯二甲酸的方法，其中在含有钴，锰和溴的催化剂的存在下，在180-230℃的温度下，在含水的溶液中，将对二甲苯在空气中氧化成对苯二甲酸 乙酸溶剂，其中从用于氧化对二甲苯的反应容器获得的废气中所含的氧气浓度为2〜8体积％，所述方法包括：（a）通过冷凝气体制备氧化废气 从所述反应容器取出用于从所述气体中除去冷凝物，（b）将所制备的氧化废气分成排放气体和再循环气体，其中所述再循环气体与所述排放气体的体积比为0.3至5，所述排放 气体被排出到反应系统的外部，（c）连续地将所述再循环气体供应到所述反应容器的液相，和（d）在反应下进行对二甲苯的氧化反应 当气体不再循环到系统时，离子压力高于反应体系的压力。

    Process for preparing an aqueous slurry of terephthalic acid
    5.
    发明授权
    Process for preparing an aqueous slurry of terephthalic acid 失效
    制备对苯二甲酸的水性浆液的方法

    公开(公告)号：US5557009A

    公开(公告)日：1996-09-17

    申请号：US550935

    申请日：1995-10-31

    申请人： Yoshiaki Izumisawa ,  Yoshiyuki Sumi ,  Takayuki Isogai

    发明人： Yoshiaki Izumisawa ,  Yoshiyuki Sumi ,  Takayuki Isogai

    IPC分类号： C07C51/47 ,  C07C51/265

    CPC分类号： C07C51/47

    摘要： A process for preparing an aqueous slurry of terephthalic acid, which comprises oxidizing p-xylene with molecular oxygen in a liquid phase in an acetic acid solvent in the presence of a catalyst, to obtain an acetic acid slurry of terephthalic acid, separating terephthalic acid crystals from the acetic acid slurry, washing the terephthalic acid crystals containing acetic acid, with p-xylene or an acetic acid ester, and then mixing water thereto.

    摘要翻译： 一种制备对苯二甲酸的水性浆料的方法，其包括在催化剂存在下，在乙酸溶剂中，在液相中用分子氧氧化对二甲苯，得到对苯二甲酸的乙酸浆液，分离对苯二甲酸晶体 从乙酸浆液中洗涤含有乙酸的对苯二甲酸晶体与对二甲苯或乙酸酯，然后将水混合。

    Process for preparing terephthalic acid
    8.
    发明授权
    Process for preparing terephthalic acid 失效
    制备对苯二甲酸的方法

    公开(公告)号：US4197412A

    公开(公告)日：1980-04-08

    申请号：US952193

    申请日：1978-10-17

    申请人： Tsuneo Kimura ,  Hiroshi Hashizume ,  Yoshiaki Izumisawa

    发明人： Tsuneo Kimura ,  Hiroshi Hashizume ,  Yoshiaki Izumisawa

    IPC分类号： C07C63/26 ,  B01J23/00 ,  B01J27/00 ,  B01J27/08 ,  B01J31/00 ,  C07B61/00 ,  C07C51/00 ,  C07C51/265 ,  C07C67/00 ,  C07C51/42

    CPC分类号： B01J27/08 ,  C07C51/265 ,  Y02P20/52

    摘要： A process for the continuous preparation of pure terephthalic acid by oxidation of p-xylene with molecular oxygen in acetic acid solvent comprising conducting the oxidation at a temperature of 205.degree. to 230.degree. C. in the presence of an oxidation catalyst comprising (a) a cobalt compound in an amount of at least 120 ppm and less than 200 ppm as cobalt based on the weight of solvent, (b) a manganese compound sufficient to provide a manganese to cobalt weight ratio of 0.5 to 1.5 and (c) a bromine compound selected from hydrogen bromide, cobalt bromide and manganese bromide in an amount of 200 to 1,000 ppm as bromine based on the weight of solvent, while the water content of the liquid phase of the reaction system is kept at 4 to 14 percent by weight.

    摘要翻译： 一种通过在乙酸溶剂中用分子氧氧化对二甲苯来连续制备纯对苯二甲酸的方法，包括在氧化催化剂存在下在205-230℃的温度下进行氧化，所述氧化催化剂包含（a） 钴化合物的量为至少120ppm且小于200ppm，作为钴，基于溶剂的重量，（b）锰化合物足以提供锰与钴的重量比为0.5至1.5和（c）溴化合物 选自溴化物，溴化钴和溴化锰，其量为基于溶剂重量的溴为200-1,000ppm，反应体系的液相的水含量保持在4至14重量％。

    Process for producing terephthalic acid
    10.
    发明授权
    Process for producing terephthalic acid 失效
    对苯二甲酸生产方法

    公开(公告)号：US5567842A

    公开(公告)日：1996-10-22

    申请号：US550400

    申请日：1995-10-30

    申请人： Yoshiaki Izumisawa ,  Tukasa Kawahara ,  Akihiko Toyosawa

    发明人： Yoshiaki Izumisawa ,  Tukasa Kawahara ,  Akihiko Toyosawa

    IPC分类号： C07C51/43

    CPC分类号： C07C51/43

    摘要： A process for producing terephthalic acid, which comprises dissolving crude terephthalic acid in an aqueous medium, contacting it with a platinum group metal catalyst for purification under a temperature condition of from 260.degree. to 320.degree. C., crystallizing terephthalic acid from the aqueous solution of terephthalic acid by cooling the aqueous solution stepwise in a plurality of crystallizers connected in series, in such a manner that in a first crystallization zone, the crystallization temperature is adjusted to a level within a range of from 240.degree. to 260.degree. C. and agitating is carried out by impeller with a power requirement of impeller within a range of from 0.4 to 10 kw/m.sup.3, and then, in a second crystallization zone, the crystallization temperature is adjusted to a level within a range of from 180.degree. to 230.degree. C., which is lower by from 20.degree. to 60.degree. C. than the crystallization temperature in the first crystallization zone, followed by solid-liquid separation, and drying the separated terephthalic acid crystals to obtain terephthalic acid particles wherein the proportion of particles having particle sizes exceeding 210 .mu.m is at most 10 wt %.

    摘要翻译： 一种对苯二甲酸的制造方法，其包括将粗对苯二甲酸溶解在水性介质中，使其与铂族金属催化剂接触，在260〜320℃的温度条件下进行纯化，从对苯二甲酸的水溶液中 对苯二甲酸通过在多个连续串联的结晶器中逐步冷却水溶液，使得在第一结晶区中，将结晶温度调节至240-260℃的范围内并搅拌 由叶轮的功率要求在0.4〜10kw / m 3的范围内由叶轮进行，然后在第二结晶区中将结晶温度调节至180〜230℃的范围内 C.比第一结晶区的结晶温度低20〜60℃，然后进行固液分离，干燥t 将对苯二甲酸晶体分离，得到粒径超过210μm的粒子的比例为10重量％以下的对苯二甲酸粒子。