Cleaning and liquid contact with solids – Processes – Hollow work – internal surface treatment
Patent
1989-04-14
1991-04-30
Chaudhuri, Olik
Cleaning and liquid contact with solids
Processes
Hollow work, internal surface treatment
134 2211, 134 41, 134 3, 252 81, 252146, 252147, 252148, C23F 144, C23F 100
Patent
active
050115391
ABSTRACT:
A method for descaling the inside of a jacket of a glass-lined instrument by using a cleaning solution containing a detergent and an inhibitor is disclosed, wherein the amount of hydrogen permeated through the matrix of the instrument to the lining glass side is estimated by measuring a rate of hydrogen permeation through the jacket material or a test piece fitted to the circulation line of the cleaning solution and inserting the measured value into a previously established relationship between thickness of a steel plate and a rate of hydrogen permeation, and the concentrations of the detegent and the inhibitor in the cleaning solution, the descaling temperature or the descaling time is controlled so that the rate of hydrogen permeation through the matrix may not exceed 30 ml per m.sup.2 of the matrix during the descaling. A relatively large amount of scales can be rapidly and easily removed without causing breaking of the lining glass due to hydrogen permeation while minimizing corrosion of the matrix.
REFERENCES:
patent: 3049496 (1962-08-01), Monroe
patent: 3401120 (1968-09-01), Chiddix
patent: 3404094 (1968-10-01), Keeney
patent: 3440170 (1969-04-01), de Hek
patent: 3458354 (1969-07-01), Reich
patent: 3686123 (1972-08-01), Hiroshi
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Chemical Abstracts, vol. 70, No. 24, Jun. 16, 1969, "Use of Corrosion Inhibitors in Pickling Baths to Lower Amount of Hydrogen Formed."
Shinko Phaudler Catalogue, No. 702, with partial translation.
Matsuda Teruo
Miki Masayoshi
Ochi Hiromu
Chaudhuri Olik
Ojan Ourmazd S.
Sumitomo Chemical Company Limited
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