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Method for removing carbon scale
| Details |
Inventors: Ueki, Hiroshi;
Assignee: Kurita Water Industries Ltd. (Osaka, JA)
Primary Examiner: Bashore; S. Leon
Assistant Examiner: Fisher; Richard V.
Attorney, Agent or Firm: Woodhams, Blanchard and Flynn
A method for removing carbon scale, comprising permeating carbonate or bicarbonate into the carbon scale formed on a metal surface of a heating furnace, reactor or the like in a chemical plant by bringing the former into contact with the latter and decomposing the thus treated scale through oxidation by applying heat. |
|
DETAILED DESCRIPTION What is claimed is: 1.
A method for removing adherent carbon-containing scale from an object, which consists essentially of the steps of: contacting said scale with a 0.
1 to 20 weight percent aqueous solution of a substance selected from the group consisting of ammonium carbamate and sodium, potassium, silver, ammonium and amine carbonates and bicarbonates, for a first period of time effective to permeate said solution into said scale; then removing the remaining solution from contact with said scale; then heating the scale to a temperature in the range of from 200.
degree.
to 500.
degree.
C and simultaneously circulating past said scale and in contact therewith a stream of air or gaseous oxygen, for a second period of time effective to oxidize the carbon in said scale and to transform it to a gas so that it is removed from said object.
2.
A method according to claim 1, wherein said first period of time is from 1 to 48 hours.
3.
A method according to claim 1, wherein said first period of time is from 6 to 48 hours.
4.
A method according to claim 1, wherein said solution contains a surface active agent.
5.
A method according to claim 1 including the step of circulating superheated steam into contact with said scale simultaneously with the circulation of the stream of air or oxygen.
6.
A method according to claim 1, wherein said substance is sodium, potassium, silver, ammonium or amine carbonate.
7.
A method according to claim 1, wherein said substance is sodium, potassium or ammonium carbonate.
8.
A method according to claim 1, wherein said second period of time is from 1 to 24 hours.
9.
A method according to claim 1, wherein said second period of time is from 5 to 24 hours.
10.
A method according to claim 1, wherein said scale is heated at a temperature in the range of from 250.
degree.
to 450.
degree.
C.
11.
A method according to claim 1, wherein the scale is a carbon scale formed in the reactor and/or the furnace of a naptha cracking system.
12.
A method according to claim 1 wherein said scale is heated at about 50
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Molecular Biology 
