公开(公告)号：DE2153671A1

公开(公告)日：1973-05-17

申请号：DE2153671

申请日：1971-10-28

Applicant: DEGUSSA

Inventor： KLEBE HANS DIPL CHEM DR ,  LANGE LUDWIG DIPL CHEM DR ,  VOELLIG AXEL DIPL CHEM DR ,  DIETHER JEAN

IPC: C01G1/02 ,  C01B13/14 ,  C01B13/22 ,  C01B13/24 ,  C01B33/16 ,  C01B33/18 ,  C01D1/02

Abstract: Process for the production of a finely divided oxide of a metal or silicon by the hydrolytic conversion of a volatile corresponding metal halide or silicon halide in a flame, said process comprising feeding the volatile halide in a mixture with a combustible hydrogen-containing gas and air or oxygen to a burner provided with a mouth emitting a flame, burning the mixture in a fire tube to form a first portion of water vapor, said burner surrounded by an annular chamber forming a nozzle through which hydrogen is passed to keep the mouth of the burner free of attachments of solid substances, the quantity of oxygen or air being sufficient for the practically complete combustion of the combustible gas, and the quantities of oxygen or air and combustible gas being sufficient to produce the first portion of water vapor which will at least suffice for the hydrolysis of the volatile halides, and further wherein said flame is allowed to burn in an atmosphere consisting of gases containing a second portion of water vapor, to avoid the formation of halogen gas in waste gases and separating the resulting oxide from other reaction products. The finely divided oxides are useful as additives and fillers in the manufacture of coatings, adhesives and elastomers.

公开(公告)号：DE3016173A1

公开(公告)日：1981-11-12

申请号：DE3016173

申请日：1980-04-26

Applicant: DEGUSSA

Inventor： HINRICHS WALTER DIPL CHEM DR ,  HAMMER FRIEDRICH ,  LANGE LUDWIG DIPL CHEM DR

IPC: B21C23/00 ,  B21C29/00 ,  B21C33/02 ,  B22D11/04

Abstract: A process is described for the production of solid alkali metal strands, whereby molten alkali metal is introduced to an extrusion apparatus and is continuously cooled down as the metal travels along a section of the extrusion apparatus by means of a worm. There is a temperature gradient between the point at which the molten alkali metal enters the extruder down to a temperature below its solidification point near the nozzle, at which the metal is still sufficiently ductile for extrusion, and is then fed to a nozzle for shaping into the stands.