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公开(公告)号：US3673154A
公开(公告)日：1972-06-27
申请号：US3673154D
申请日：1970-06-26
发明人： TREVILLYAN ALVIN E
CPC分类号： B01J31/04 , B01J23/26 , B01J23/745 , B01J27/232 , B01J31/403 , B01J2231/70 , B01J2531/845 , C22B3/0024 , Y02P10/234
摘要： There is disclosed a cobalt catalyst recovery process which can provide substantially 100 percent recovery of cobalt from metaor para-xylene oxidation reaction products, in a catalytically active form relatively free from side reaction, tramp metal and corrosion products. The reaction medium, after recovery of isophthalic or terephthalic acid products, is distilled or flashed, diluted with water to achieve a cobalt concentration and acetic acid concentration sufficient to yield a pH of the solution above 3.0 and to precipitate iron and chromium values. The reaction medium is separated from these precipitates and treated with aqueous sodium carbonate which serves to convert the side reaction organic acids to soluble sodium salts and the cobalt to insoluble cobalt carbonate. Nickel impurities may be converted to a soluble form. The cobalt carbonate is separated out by filtration or the like, and is reconverted to cobalt acetate by treating the carbonate with acetic acid and, if desired, a minor amount of water. The catalyst solution, preferably after water removal, is recycled to the oxidation process.
摘要翻译： 公开了一种钴催化剂回收方法，其可以以相对不含副反应，流动金属和腐蚀产物的催化活性形式从间位或对二甲苯氧化反应产物提供基本上100％的钴回收率。 反应介质在回收间苯二甲酸或对苯二甲酸产物后蒸馏或闪蒸，用水稀释以达到钴浓度和乙酸浓度足以产生高于3.0的溶液的pH值并沉淀铁和铬的值。 将反应介质与这些沉淀物分离并用碳酸钠水溶液处理，用于将副反应有机酸转化为可溶性钠盐，将钴转化为不溶性碳酸钴。 镍杂质可能转化为可溶形式。 通过过滤等分离出碳酸钴，并通过用乙酸处理碳酸酯并且如果需要，少量的水将其再转化为乙酸钴。 催化剂溶液，优选在除水后，再循环到氧化过程中。
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2.发明授权Preparation of phenylene diisocyanate by thermal decomposition of corresponding dinitrile sulfite 失效通过相应的DINITRILE SULFITE的热分解制备苯二甲酸亚苯基酯
公开(公告)号：US3670003A
公开(公告)日：1972-06-13
申请号：US3670003D
申请日：1969-06-12
IPC分类号： C07C263/08 , C07C119/04
CPC分类号： C07C263/08 , C07C263/20 , C07C265/14
摘要： A solvent system employed in the preparation of phenylene diisocyanates in high yields and purity from phenylene di(nitrile sulfites) wherein the nitrile sulfite groups are either meta or para to each other, is disclosed. The solvents employed are paraffinic hydrocarbons often having about 4 to 16 carbon atoms. Solvent recycle is advantageously employed in the decomposition of, for instance, benzene-1,4-di(nitrile) sulfite) to improve product yield without decreasing purity.
摘要翻译： 公开了用于制备亚苯基二异氰酸酯的高产率和纯度的亚苯基二（亚硝基亚硫酸酯）的溶剂体系，其中腈亚硫酸酯基彼此是间位或对位的。 所使用的溶剂是通常具有约4至16个碳原子的链烷烃。 溶剂循环有利地用于分解例如苯-1,4-二（腈）亚硫酸盐）以提高产物产率而不降低纯度。
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