Method for the treatment of fluidized carbon black utilizing level sensing means

US4647444A · kind A · utility

Assignee

• Degussa AG · DE

Inventors

• Manfred Voll · Hanau, DE
• Richard Engel · Jacksonville, US

Key dates

• Filing date: Jun 21, 1985
• Grant date: Mar 3, 1987
• Expiry date: Jun 21, 2005

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2006/80
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Method for the treatment of fluidized carbon black with gases in a fluidized bed, wherein the carbon black and the treatment gases are conveyed for introduction in an unique operating procedure into the treating region in a countercurrent stream manner. The mass stream of the carbon black and the treating gases are held constant and the mass streams of the starting carbon black or the treated carbon black is regulated with the help of an optical electrical level sensor means so that the height of the fluidized bed is bed is held on a predetermined level. An apparatus is shown for the carrying out of the fluidized bed countercurrent process which has a novel carbon black product delivery system and is provided with a optical electrical level sensor means for controlling the level of the fluidized bed. The sensor means comprises a hair pin shaped lighting circuit composed of two legs or rods separated by a gap. A light source impinges on the end of one of he said legs and the other leg is oriented to an electrical signal generating light sensor.