Patent · US Expired

Process for removing carbon black from aqueous suspensions

US4482460A · kind A · utility

4Cited by

3References

8Claims

0Family size

Assignee

Hoechst GmbH · DE

Inventors

Joachim Kandler · Lechenich, DE
Manfred Wolter · Lechenich, DE

Key dates

Filing date	Dec 8, 1980
Grant date	Nov 13, 1984
Priority date	—
Expiry date	Dec 8, 2000

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC02F2209/02
WIPO fieldEnvironmental technology
WIPO sectorChemistry

Abstract

The invention relates to a process for removing carbon black from an aqueous suspension obtained by washing a gas containing carbon black with water. To this end, a gas stream comprising hydrocarbons and at least one inert gas is introduced into a suspension having a solids content of from 0.5 to 4% by weight, at a temperature of from 10.degree. to 80.degree. C. In so doing, the carbon black agglomerates and collects on the surface of the suspension water from which it is separated, for example by skimming it off. The gas stream is produced by passing inert gas over the separated carbon black containing the hydrocarbons and heated to 200.degree. to 400.degree. C., the carbon black being converted into a dry, free-flowing material.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.