Purification of aqueous urea solutions in a urea dewaxing proces

Details Purification of aqueous urea solutions in a urea dewaxing proces Purification of aqueous urea solutions in a urea dewaxing proces

1975-04-28

1976-05-04

Levine, Herbert

Mineral oils: processes and products

Paraffin wax; treatment or recovery

With ureas

260 965C, C07B 2100, C10G 4304

Patent

active

039545989

ABSTRACT:
Dilute aqueous urea solutions, contaminated with oil-solvent solution and obtained as filtrate or centrifugate in a urea dewaxing process of the type where a concentrated aqueous solution of urea is employed to form the wax-urea adduct, are purified by admixing the contaminated dilute aqueous urea solution with 1-25, preferably 2-5 volumes of solvent per volume of oil-solvent solution contamination, filtering the mixture, settling the mixture into two liquid phases, a substantially uncontaminated aqueous urea solution and an oil-solvent solution, and separating the two phases.

REFERENCES:
patent: 3269935 (1966-08-01), Maas et al.
patent: 3661766 (1972-05-01), Franz et al.

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