JP2586934B2 - Detergent for deposits in rotating oil purifier - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an oil purifier used for keeping heavy fuel oil and lubricating oil clean. The present invention relates to a cleaning agent used for cleaning.

<Conventional technology> In oil purifiers used to keep heavy fuel oil and lubricating oil clean, as a cleaning agent for deposits such as sludge generated in the rotating body, a chlorine-based solvent is first used as a main component. There is a detergent containing a surfactant, particularly an acidic surfactant, an inorganic acid, an organic acid and the like.

Further, recently, there is a detergent obtained by solubilizing or emulsifying a chelating agent and a hydrocarbon solvent with a surfactant or the like, and is used as a detergent for improving the above-mentioned detergent.

<Problems to be Solved by the Invention> Among the above-mentioned conventional cleaning agents, the former cleaning agent, that is, cleaning in which a surfactant, particularly an acidic surfactant and an inorganic acid, an organic acid, etc. are blended with a chlorine-based solvent as a main component. The agent is quite effective against oily sludge with a high organic content,
A satisfactory effect has not been obtained for solid sludge containing a large amount of inorganic substances, especially lubricating oil. Further, since this cleaning agent contains a chlorine-based solvent, there are problems such as health of workers, air pollution, disposal problems, and corrosion of materials due to being acidic.

Further, the latter of the conventional cleaning agents, that is, a cleaning agent obtained by solubilizing or emulsifying a chelating agent and a hydrocarbon-based solvent with a surfactant or the like is toxic to the chlorine-based solvent described above, Although the problem of corrosiveness has disappeared, the cleaning effect is insufficient, especially for solidified sludge, and the development of a more effective cleaning agent is desired.

<Means for Solving the Problems> The present invention has been proposed in view of the above, and carbonates 0.1 to 3
The present invention relates to a detergent for deposits in a rotating body of an oil purifier, wherein 0 wt%, 1 to 30 wt% of a salt of a chelating agent, and 1 to 30 wt% of a hydrocarbon solvent are solubilized or emulsified in water.

The cleaning agent for deposits in the rotary body of the oil purifier of the present invention will be described in detail. As the carbonate contained in the cleaning agent of the present invention, at least one kind of carbonate dissolved in water such as sodium hydrogen carbonate, potassium carbonate, ammonium hydrogen carbonate, etc. The above is blended.

Examples of the chelating agent salts include sodium, potassium, ammonium, and alkanolamine salts of aminopolycarboxylic acid chelating agents such as ethylenediaminetetraacetic acid, cyclohexanediaminetetraacetic acid, and ethyletherdiaminetetraacetic acid, and carboxylic acid chelating agents. There are sodium, potassium, ammonium, alkanolamine salts of citric acid, gluconic acid, succinic acid and maleic acid as agents, and other salts of chelating agents include polyphosphates, salts of phosphonic acids, and polymeric carboxylic acids. There is no particular limitation, but aminopolycarboxylic acid salts are more effective. Here, since the chelating agent decomposes the carbonate which is an essential component of the present invention in the form of a free acid, it is compounded with a salt compound.

Further, from the viewpoint of preventing corrosion of the rotating body and other equipment, a salt having a liquid property near neutral is desirable. At least one kind of chelating agent salt is blended.

Further, as the hydrocarbon solvent used in the cleaning agent of the present invention, mineral spirits, fume kerosene, light oil, machine oil, spindle oil, methyl naphthalene and the like, petroleum fractions,
There are paraffins, naphthenic hydrocarbons, and aromatic hydrocarbons, but there is no particular limitation to these components, and other hydrocarbon solvents can be used.

The amounts of the carbonate, chelating agent salt and hydrocarbon solvent used in the present invention are 0.1 to 30 wt% of carbonate, 1 to 30 wt% of chelating agent salt and 1 to 30 wt% of hydrocarbon solvent.
~ 30 wt%. Satisfactory cleaning effects cannot be obtained if the amount is less or more than the amount of each component specified as described above.

In order to solubilize or emulsify carbonates, salts of chelating agents and hydrocarbon solvents, and to improve wettability, penetration and dispersibility of solid deposits such as sludge, surfactants or lower alcohols, A water-soluble solvent such as a derivative of a polyhydric alcohol or a polyhydric alcohol may be added.

As the surfactant in this case, any of nonionic, anionic, or amphoteric, cationic surfactants can be used, and particularly, anionic surfactants such as polyoxyethylene alkyl ether sulfate and polyoxyethylene alkyl ether phosphate are usable. Surfactants are good in emulsification and detergency, and nonionic polyoxyethylene alkyl phenyl ethers and polyoxyethylene alkyl ethers are good.

The effect of the carbonate used in the present invention is that the reactivity (foaming property) with respect to solid deposits such as sludge is much higher than that of the composition to which no carbonate is added, and it is collapsed and decomposed in a short time. . Although it is not clear on the theory that the reactivity (foaming property) increases by the addition of carbonate, solid deposits such as sludge disintegrate and decompose in a short time due to the addition of carbonate, and It is recognized that the hydrocarbon solvent dissolves and swells organic matter such as oil and resin, so that the sludge eventually dissolves partially in the detergent, and the undissolved matter is dispersed as fine particles. .

As described above, the cleaning agent of the present invention is effective for cleaning sludge adhering to the rotating body of an oil purifier, particularly, solid sludge such as lubricating oil, which has been conventionally difficult.

<Example> Hereinafter, a cleaning agent for deposits in a rotating body of an oil purifier of the present invention will be described in detail based on an example.

Example 1 Sodium gluconate 20wt% Spindle oil (No.1) 15〃 Polyoxyethylene sorbitan fatty acid ester 7〃 Sodium carbonate 5〃 Water 53〃 Example 2 Triammonium ethylenediaminetetraacetate 15wt% (50% aqueous solution) Kerosene for fume 10ポ リ polyoxyethylene nonyl phenyl ether 30 ナ ト リ ウ ム sodium sulfate (30% aqueous solution) sodium carbonate 5〃 glycerin 5〃 water 35〃 Example 3 Ammonium trimethylene phosphonate 8 wt% methyl naphthalene 8〃 polyoxyethylene nonyl phenyl ether 10〃 ( Ethylene oxide addition mole number = 7.5 mol) Butyl carbitol 5 wt% Cyclohexanol 2 sodium bicarbonate 0.1 water 66.9 Example 4 Ammonium citrate 2 wt% ethylenediaminetetraacetic acid 4 sodium 5 kerosene 7 methyl naphthalene 3 po Lioxyethylene oleyl ether 10〃 (number of moles of ethylene oxide added = 10 mol) Ammonium hydrogen carbonate 4〃 potassium carbonate 2〃 triethanolamine lauryl sulfate 5〃 (42% aqueous solution) water 62〃 Example 5 cyclohexanediaminetetraacetic acid diethanolamine 20 wt
% Mineral spirits 5 Potassium carbonate 30% Polyoxyethylene nonyl phenyl ether 5wt% Water 40% Comparative example 1 (no carbonate) Triammonium ethylenediaminetetraacetate 15wt% (50% aqueous solution) Kerosene for fume 10% Polyoxyethylene nonyl phenyl Ether 30〃 Sodium sulfate (30% aqueous solution) Glycerin 5〃 Water 40〃 Comparative Example 2 (carbonate, no chelating agent) Kerosene 10wt% polyoxyethylene nonyl phenyl ether 15〃 (number of moles of ethylene oxide added: 7.5 mol) Methyl Naphthalene 5〃 Ethylene glycol 5〃 Water 65〃 Comparative example 3 (Conventional cleaning agent mainly containing chlorine-based solvent) Naphthalene 5〃 Sill benzenesulfonic acid triethanolamine 5〃
Citric acid 1〃 Water 29〃 Washing test method Contaminated discs of an oil purifier self-ejector (two types for fuel oil and lubricating oil) operated on an actual ship for about 1500 hours are extracted, divided into the same number of pieces, and set again. Then, the cleaning liquid was circulated while operating the oil purifier, and after 1 hour and 3 hours, the cleaning liquid was taken out, and the cleaning state of the disk was visually observed. Incidentally, the deposit on the disk for the lubricating oil was solid sludge.

 The results are shown in Table 1 below.

<Effect of the Invention> As described above, according to the present invention, a conventional cleaning agent,
That is, it is superior to a detergent containing a chlorine-based solvent as a main component, a chelating agent and a detergent containing a hydrocarbon-based solvent in disintegrating and decomposing solid sludge in a short time. In addition, the toxicity and corrosion prevention of chlorine-based solvents have been solved.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical display location C11D 7:32)

Claims (1)

(57) [Claims] 1. A salt of a chelating agent having a carbonate content of 0.1 to 30% by weight.
A cleaning agent for deposits in a rotating body of an oil purifier obtained by solubilizing or emulsifying 1 to 30 wt% of a hydrocarbon solvent and 1 to 30 wt% of a hydrocarbon solvent in water.