公开(公告)号：US3897464A

公开(公告)日：1975-07-29

申请号：US35056973

申请日：1973-04-12

Applicant: BAYER AG

Inventor： DOHM HEINZ ,  MORGENSTERN KARL ,  MULLER LUDWIG ,  WIEMERS RUDOLF

IPC: C07D307/89 ,  B01J27/00 ,  B01J31/00 ,  C07B61/00 ,  C07C45/00 ,  C07C46/04 ,  C07C50/12 ,  C07C51/31 ,  C07C67/00 ,  C07D63/18

CPC classification number: C07C46/04 ,  C07C51/313 ,  C07C50/12 ,  C07C63/16

Abstract: In the production of 1,4-naphthoquinone along with phthalic anhydride by the catalytic gas phase oxidation of naphthalene, the improvement which comprises maintaining in the reaction space a sulphur concentration of about 0.002 to about 0.1% by weight based on the naphthalene used. Advantageously the sulphur content is about 0.01 to 0.02%, the sulphur being in elementary form or conbined organic or inorganic form, e.g. sulphur dioxide. The preferred catalyst is vanadium pentoxide, alkali metal sulphate and alkali pyrosulphate and it is pretreated by conducting over it nitrogen containing 0.1 to 1% by volume of oxygen along with naphthalene and then a sulphur dioxide - air mixture. The yield of naphthoquinone is increased markedly compared with process effected in the presence of far more sulphur.

Abstract translation: 在通过萘的催化气相氧化制备1,4-萘醌和邻苯二甲酸酐时，其改进包括在反应空间中保持基于所用萘的约0.002至约0.1重量％的硫浓度。 有利地，硫含量为约0.01至0.02％，硫为初级形式或共轭有机或无机形式，例如。 二氧化硫。 优选的催化剂是五氧化二钒，碱金属硫酸盐和碱式焦硫酸盐，并且通过将含有0.1至1体积％的氧以及萘和二氧化硫 - 空气混合物的氮进行预处理。 与存在更多硫的方法相比，萘醌的产率显着增加。