公开(公告)号：DE3234359A1

公开(公告)日：1983-04-07

申请号：DE3234359

申请日：1982-09-16

Applicant: BASF AG

Inventor： BUETTNER WERNER ,  SCHWARTZ ERICH DIPL CHEM DR ,  WAGNER GERHARD DIPL ING

IPC: G01N17/00

Abstract: A metal specimen formed as a hollow body (8) projects into the vapour, steam or gas flow and a cooling or heating medium is able to flow through it. To establish a certain surface temperature of the hollow body, its wall is in contact with a thermocouple for the purpose of suitable thermostatic regulation. An electrode (9) is arranged at a short distance from the surface of the hollow body to indicate the dew point.

公开(公告)号：DE2536535A1

公开(公告)日：1977-02-24

申请号：DE2536535

申请日：1975-08-16

Applicant: BASF AG

Inventor： OHLINGER MANFRED DIPL CHEM DR ,  WAGNER GERHARD DIPL ING ,  HONECKER GERHARD DIPL ING ,  STRITZINGER HEINZ DIPL ING ,  SPAEHN HEINZ DIPL ING

IPC: C01G37/00 ,  B01J19/02 ,  C01G37/027 ,  C23F11/04 ,  C23F11/18

Abstract: In order to reduce corrosion of the inside walls of a reactor made of iron or an iron alloy and used for the synthesis of chromium dioxide by hydrothermal conversion of chromium(VI) oxide with chromium oxides of lower valency, lead or bismuth is added at those points of the reactor at which an aqueous phase occurs during conversion and which do not contact the chromium oxides to be converted. The lead or bismuth may be used in metallic form or in the form of their oxides, hydroxides or salts.