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Document ID (ISN)58187
CIS number 92-982
ISSN - Serial title Research Reports of the Research Institute of Industrial Safety
Year 1991
Convention or series no. RIIS-PR-90, 1990
Author(s) Kodama T., Tabata Y.
Title Electrostatic charging of dielectric liquids mixed with powders caused by agitation and prevention of charging
Original title Koeki nisōkei no kakuhan kongō ni yoru seidenki taiden no teiryōka to taiden bōshi [in Japanese]
Bibliographic information 10 May 1991, p.89-100. Illus. 9 ref.
Abstract A dispersed phase of solid particles or water droplets in a poorly conductive liquid produces a large electrostatic charge during agitation and thereby may lead to fires or explosions due to electrostatic discharges. Experiments using a cylindrical stainless vessel, 310mm in diameter and 315mm in depth with a paddle impeller, were conducted. Mixing of glass powders (frit), glass beads, adipic acid, titanium dioxide or epoxy resin, into kerosene or xylene gave not only a high charge density (>10ÁC/m3) during agitation but also a large increase of electric potential after cessation of agitation when the median particle diameter was below 200Ám. Addition of a commercial conductivity additive, "ASA-3" or polar organic solvents such as methanol and acetone to the hydrocarbon liquids greatly reduced charge density (to 0.1ÁC/m3) both during and after the agitation, when the conductivity of liquid was raised to about 1nS/m.
Descriptors (primary) static electricity; agitation and mixing; antistatic additives; fire prevention; explosion prevention
Descriptors (secondary) acetone; ASA-3; static electricity elimination; methanol
Document type D - Periodical articles
Country / State or ProvinceJapan
Subject(s) Electricity
Broad subject area(s) Fires, explosions and major hazards
Browse category(ies) Electricity