公开(公告)号：US4594449A

公开(公告)日：1986-06-10

申请号：US556161

申请日：1983-11-29

申请人： Toshiaki Takuma ,  Takayuki Tsumura ,  Takanori Tsugiya ,  Katsuya Murakami ,  Yasue Nakajima

发明人： Toshiaki Takuma ,  Takayuki Tsumura ,  Takanori Tsugiya ,  Katsuya Murakami ,  Yasue Nakajima

IPC分类号： C07C63/26 ,  B01J31/00 ,  C07B61/00 ,  C07C51/00 ,  C07C51/487 ,  C07C67/00 ,  C07C51/265

CPC分类号： C07C51/487 ,  Y02P20/52

摘要： A process for producing terephthalic acid suitable for use in direct polymerization, which comprises oxidizing p-xylene with molecular oxygen in an acetic acid solvent in the presence of a heavy metal compound and a bromine compound, wherein after a main reaction step of oxidizing at least 90 mole % of p-xylene fed has been performed,(1) a first purifying step of feeding a gas containing molecular oxygen to the oxidation reaction mixture obtained from the main reaction step in such a proportion that the concentration of oxygen in the off-gas becomes at least 0.5% by volume and smashing the oxidation reaction mixture at a temperature of 140.degree. to 230.degree. C. to decrease the average particle diameter of terephthalic acid by at least 20% from its average particle diameter before smashing, and(2) a second purifying step of feeding a gas containing molecular oxygen to the slurry from the first purifying step in such a proportion that the concentration of oxygen in the off-gas becomes 0.05 to 5% by volume, and contacting the slurry with the molecular oxygen-containing gas at a temperature at least 10.degree. C. higher than in the first purifying step and within the range of 180.degree. to 300.degree. C.,are performed successively, and the resulting purified slurry is subjected to solid-liquid separation to recover terephthalic acid.

摘要翻译： 一种适用于直接聚合的对苯二甲酸的方法，其包括在重金属化合物和溴化合物的存在下，在乙酸溶剂中用分子氧氧化对二甲苯，其中在主要反应步骤至少氧化至少 已经进行了90摩尔％的对二甲苯进料，（1）第一纯化步骤，将从主反应步骤得到的氧化反应混合物中加入含有分子氧的气体， 气体至少为0.5体积％，在140〜230℃的温度下粉碎氧化反应混合物，使对苯二甲酸的平均粒径从粉碎前的平均粒径降低至少20％，（2 ）第二纯化步骤，将来自第一纯化步骤的浆料中含有分子氧的气体以使得废气中的氧浓度变为0.05 至5体积％，并且在比第一纯化步骤高至少10℃的温度和180℃至300℃的范围内使浆料与含分子氧的气体接触， 将得到的纯化浆液进行固液分离，回收对苯二甲酸。

公开(公告)号：US5811488A

公开(公告)日：1998-09-22

申请号：US866392

申请日：1997-05-30

申请人： Naoto Narumoto ,  Takanori Kitamura ,  Yuji Takenouchi ,  Takanori Tsugiya ,  Hisamichi Yanai

发明人： Naoto Narumoto ,  Takanori Kitamura ,  Yuji Takenouchi ,  Takanori Tsugiya ,  Hisamichi Yanai

IPC分类号： C08F8/12 ,  C08J3/03 ,  C08J3/12 ,  C08J9/28 ,  C08L29/02 ,  C08L29/04 ,  C08F116/06

CPC分类号： C08J3/03 ,  C08F8/12 ,  C08J3/12 ,  C08J5/18 ,  C08J9/28 ,  C08J2201/05 ,  C08J2329/04

摘要： The present invention provides a polyvinyl alcohol powder which comprises a pore having an average diameter of 0.1 to 10 .mu.m in the range of 0.05 to 0.4 cc/g. Since the PVA powder of the present invention has an excellent solubility in water, an aqueous solution thereof can easily be prepared industrially.Since the PVA powder of the present invention has a low content of an organic volatile component and a low content of a nonvolatile component such as a carboxylic acid salt or the like which is derived from a basic catalyst, it has an excellent industrial handleability.

摘要翻译： 本发明提供一种聚乙烯醇粉末，其包含在0.05〜0.4cc / g范围内的平均直径为0.1〜10μm的孔。 由于本发明的PVA粉末在水中的溶解性优异，因此其水溶液可以容易地在工业上制备。 由于本发明的PVA粉末具有低含量的有机挥发性成分，并且含量低的来自碱性催化剂的羧酸盐等不挥发成分，因此具有优异的工业操作性。