US 6,142,309 A · Method of determining the amount of residue in carbon black

Abstract

Test methods are provided for determining the amount of contaminants in a carbon black sample. The test procedures include screening a known amount of carbon black to separate larger particles in the sample from smaller particles. The sample and/or separated larger particles are treated with a separating force to disperse larger agglomerates of carbon black into smaller aggregates of carbon black and to separate contaminants from carbon black aggregates. The treated sample or separated larger particles can then be screened to again separate larger particles from smaller particles. The separating force may be a water wash stream which contacts the sample or separated larger particles at a pressure of from about 15 psi to about 35 psi. The separating force may instead or additionally be generated by a dispersing agent which can be combined with the sample or separated larger particles in an amount or concentration sufficient to disperse larger agglomerates of carbon black into smaller carbon black aggregates. The measured weight of the separated contaminants and the measured weight of the carbon black sample can be used to determine the weight percent of certain contaminants in the carbon black sample.

Claims44

Dependent claims

A method of determining the amount of contaminants in a carbon black sample, comprising

screening the carbon black sample through a first screen to separate larger particles which do not pass through the first screen from smaller particles that do pass through the first screen, said separated larger particles comprising carbon black agglomerates alone that do not pass through the first screen, soft coke particles that do not pass through the first screen, or both,
contacting the separated larger particles with a dispersing agent to form a dispersion, said dispersing agent comprising at least one organic component in an amount effective to disperse at least some of said carbon black agglomerates into smaller aggregates of carbon black that can pass through the first screen, and to separate said soft coke particles from said aggregates of carbon black and said carbon black agglomerates, said dispersion comprising large particle contaminants that do not pass through a second screen and non-contaminant particles that do pass through said second screen,
screening the dispersion through said second screen to separate the large particle contaminants from the smaller particles that do pass through the second screen, and
measuring the weight of the separated large particle contaminants that did not pass through the second screen.

1 more element

Dependencies are inferred from the claim text.

Method of determining the amount of residue in carbon black

Life of this patent

Method of determining the amount of residue in carbon black

Life of this patent

Abstract

Claims44