REGENERATION OF CONTAMINATED WET SOIL

Japanese Patent JP3628404

B2

PROBLEM TO BE SOLVED: To enhance the extraction of a contaminant from soil by improving the contact of soil with an extractant by using an extractant having high solvent capacity to a contaminant and adding a very small amt. of a hydrophilic co- solvent to the extractant.
SOLUTION: A high b.p. org. contaminant is separated from a compsn. constituted of water of an amt. from 5% to the threshold value of soil water capacity and soil containing the high b.p. org. contaminant. At this time, the compsn. is brought into contact with an extractant mixture consisting of a solvent for fractionating petroleum and a polar co-solvent which are selected so as to be capable of constituting a single liquid phase along with water contained in the compsn. to be mutually mixed. Next, a coarse fraction of soil is separated from a liquid phase containing a fine fraction of soil and, subsequently, the liquid phase is separated from the fine soil fraction. The coarse and fine soil fractions are dried. The contaminant is a polynuclear aromatic substance or an organochlorine compd. and, as the solvent, ethyl acetate is designated and, as the co-solvent, acetone and acetic acid are designated.

JP4989188	Solid-liquid extraction method
JP3572519	Batch continuous extraction device

Alessandro, Nardella
Rafaello, the cyst

JP32970795A

March 09, 2005

November 24, 1995

Click for automatic bibliography generation  

Any Technology, Societa, Pell, Ationi

B01D11/02; B09C1/02; B09C1/08; C02F1/26; C10G1/04; B09C1/00; (IPC1-7): B09C1/04; B01D11/02; B09C1/02; B09C1/08

JP5131038A
JP4503630A
JP2103281A
JP1218674A
JP5064166A
JP57174103A

Kazuo Sato
Onodera Kyohiro
Yukitaka Nakamura

Previous Patent: DEVICE FOR PREVENTING VEHICLE FROM FALLING IN REFUSE PIT

Next Patent: METHOD AND DEVICE FOR CORRECTING DIRECTION OF TRAVELING CAR