| 摘要 |
A specific nonionic surfactant is added to a component mainly comprising hydrocarbons before passing through a heat exchanger in a petrochemical plant or a polyolefin production plant, whereby fouling of the heat exchanger can be efficiently prevented, that is, the performance of the heat exchanger can be prevented from being deteriorated, and long-term operation is feasible without sacrificing the speed of production. The nonionic surfactant is preferably a polyoxyalkylene compound represented by the general formula [I] below, more preferably a compound represented by the general formula [II] below. <?in-line-formulae description="In-line Formulae" end="lead"?>R<SUP>1</SUP>-O-[CH<SUB>2</SUB>-CH(R<SUP>3</SUP>)-O]<SUB>k</SUB>-R<SUP>2</SUP> [I]<?in-line-formulae description="In-line Formulae" end="tail"?> wherein R<SUP>1</SUP>, R<SUP>2 </SUP>and R<SUP>3 </SUP>are selected from a hydrogen atom, a C1 to C20 alkyl group, a C6 to C20 aryl group and a C1 to C20 acyl group, and may be the same or different from each other. <?in-line-formulae description="In-line Formulae" end="lead"?>HO-(CH<SUB>2</SUB>CH<SUB>2</SUB>O)<SUB>m</SUB>-[CH<SUB>2</SUB>CH(CH<SUB>3</SUB>)O]<SUB>n</SUB>-(CH<SUB>2</SUB>CH<SUB>2</SUB>O)<SUB>p</SUB>H [II]<?in-line-formulae description="In-line Formulae" end="tail"?> wherein m, n and p each represent the average number of repeating units, and m is in the range of 1 to 20, n is 2 to 50 and p is 1 to 20.
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