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US 7,332,070 B2Granted
Method of preventing heat exchanger fouling
AssigneeMitsui Chemicals, Inc.
InventorsHiroto Nishida, Kouji Kishinami, Tomohiro Arase
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AssigneeMitsui Chemicals, Inc.
InventorsHiroto Nishida, Kouji Kishinami, Tomohiro Arase
Estimating the term…
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. R1—O—[CH2—CH(R3)—O]k—R2[I] wherein R1, R2 and R3 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. HO—(CH2CH2O)m—[CH2CH(CH3)O]n—(CH2CH2O)pH[II] 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.
A method of preventing the fouling of a heat exchanger, which comprises adding 0.01 to 100 weight ppm of a nonionic surfactant to component (Z) comprising at least 70 wt % hydrocarbon at a temperature of 0 to 200° C. at a pressure of 0 to 10 MPa before cooling the component (Z) in the heat exchanger, wherein the nonionic surfactant is a polyoxyalkylene compound represented by the following general formula [II]:
A method of preventing the fouling of a heat exchanger, which comprises adding 0.01 to 100 weight ppm of a nonionic surfactant to component (Z) comprising at least 70 wt % hydrocarbon at a temperature of 0 to 200° C. at a pressure of 0 to 10 Mpa before cooling the component (Z) in the heat exchanger, wherein the component (Z) is drawn from a polymerization reactor for performing (co)polymerization of one or more α-olefins.
A method of preventing the fouling of a heat exchanger which comprises adding 0.01 to 100 weight ppm of a polyoxyalkylene compound, which is used as a nonionic surfactant and is represented by the following general formula [II]
Dependencies are inferred from the claim text.