| 摘要 |
A process for the purification of spent process oil, which process comprises, mixing the process oil with an additive comprising a liquid mixture of a) at least one alkanolamine, and b) at least one member selected from the group consisting of alkanoic acids, and alkenoic acids having from 6 to 18 carbon atoms and the melting point/points such that the mixture of a) and b) is liquid at the temperature at which the process is carried out, with a pH-value of said mixture of a) and b) in the range of 5 to 8, preferably 6 to 7, and most preferably 6.3, and said mixture being substantially insoluble in the process oil, forming a two phase mixture upon mixing, and subsequent separation of the phase with process oil from the phase with said mixture of a) and b) with absorbed contaminants. The invention further provides use of alkanoic acids and alkenoic acids having from 6 to 18 carbon atoms in the preparation of a mixture for the purification of spent process oil as well as the use of alkanolamines.
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