公开(公告)号：DE2443663A1

公开(公告)日：1976-03-25

申请号：DE2443663

申请日：1974-09-12

Applicant: BASF AG

Inventor： NAGEL PETER DIPL ING ,  GRAU WERNER DIPL CHEM DR ,  MAIER HERMANN DR ,  WITTKAMP HEINRICH DIPL ING ,  FALK ROLAND DIPL CHEM DR ,  WILLMANN PAUL ING GRAD

IPC: B65H20/12 ,  B65H27/00 ,  G11B5/84 ,  B65H17/30

Abstract: A high-speed roller system for transporting webs of sheeting, preferably for coating the same with a magnetic layer, comprising a suction roller for control of the speed of the web, which suction roller has a surface containing grooves, preferably rhombic grooves, in which the perforations for sucking the sheeting are disposed, preferably at the points of intersection, the ratio of the total cross-sectional area of the perforations to the total surface area of the roller being from 0.7 to 3%.

公开(公告)号：DE956038C

公开(公告)日：1957-01-10

申请号：DEB0030419

申请日：1954-04-01

Applicant: BASF AG

Inventor： JOCKERS KURT DR ,  MAIER HERMANN DR ,  WINTERSBERGER KARL DR

IPC: C01B21/14

Abstract: In the production of hydroxylamine salts by the reduction of nitric oxide by hydrogen in an acid medium at a catalyst containing platinum metal, at least one of the elements, arsenic, antimony, bismuth, sulphur, selenium, or tellurium are also present. 5-15 per cent gram atoms of the element as a compound may be added to a platinum compound and the two compounds mutually reduced in the preparation of the catalyst. Alternatively, 3-5 per cent gram atoms of the element as a compound, which is reduced under the hydroxylamine production condition, is added to the platinum metal catalyst, preferably in the acid medium, before or during the reaction. Arsenic, antimony, and bismuth are used as trivalent compounds, and sulphur, selenium, and tellurium as di- and/or tetravalent compounds. In examples: (1)-(3) a 1 per cent platinum on graphite catalyst is suspended in sulphuric acid, arsenious, selenious, or tellurous acid, potassium antimonyl tartrate, bismuth nitrate, or sodium sulphide, or mixtures of two of these compounds are added, and hydrogen and nitric oxide are passed in at 45 DEG C. and atmospheric pressure; (4) one of the above compounds is added to the platinum chloride solution, which is reduced by formic acid in the presence of graphite powder in the preparation of the catalyst; (5) a mixed platinum and gold on graphite catalyst is used.