| 摘要 |
PURPOSE:To obtain a titled adhered material dissolving agent having remarkably increased dissolving efficiency by incorporating >=2 kinds of organic acids expressed by the formula HOOC-(CH2)n-COOH (n is 0-4 integer) into the agent, and utilizing the synergetic effect of both organic acids. CONSTITUTION:Two or more kinds of organic acids expressed by the formula HOOC-(CH2)n-COOH (n is 0-4 integer) are mixed in a specified ratio to prepare an aq. soln. of an adhered material dissolving agent having >=0.01% concn. Oxalic acid, malonic acid, succinic acid, glutaric acid, and adipic acid can be exemplified as a definite example of the organic acid expressed by the above- mentioned formula. Two or more kinds of said organic acids can be satisfactorily used, and three kinds or five kinds can be used as well. The obtained dissolving agent is supplied into the objective system, and circulated with a pump, etc. The liquid temp. is normally regulated to room temp. -30 deg.C, and the circulation time is regulated to about 0.5- several hr. After the treatment is completed, the whole amt. of the dissolving liquid is discharged, and treated or disposed otherwise as required.
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