Solvent dewaxing using combination poly (n-C.sub.24) alkylmethac

Details Solvent dewaxing using combination poly (n-C.sub.24) alkylmethac Solvent dewaxing using combination poly (n-C.sub.24) alkylmethac

1986-11-21

1988-03-01

Sneed, Helen M. S.

Mineral oils: processes and products

Paraffin wax; treatment or recovery

Separation of paraffin from oil

208 31, C10G 7304

Patent

active

047284145

ABSTRACT:
Solvent dewaxing of waxy hydrocarbon oils is improved by using a poly (n-C.sub.24) alkyl methacrylate polymer dewaxing aid in combination with lower melting point weight poly (C.sub.8 -C.sub.20) alkyl methacrylate polymer dewaxing aids. The solvent dewaxing processes improved using this combination dewaxing aid are the incremental and total predilution solvent type processes employing either surface chilled indirect heat exchanger means or direct chilling using cold solvent.
The solvent dewaxing processes are those employing normally liquid dewaxing solvents, as exemplified by C.sub.3 -C.sub.6 ketones, such as methyl ethyl ketone, methyl isobutyl ketone and mixtures thereof, mixtures of ketones with aromatic such as MEK/toluene, halogenated C.sub.2 -C.sub.4 hydrocarbons such as tetrachloraethane, trichloro ethylene, etc. Autorefrigerative solvent dewaxing processes employing low boiling point, normally gaseous hydrocarbons, such as propane, propylene, butane, butene and mixtures of such solvents, with the aforesaid ketones, e.g., propane/MEK, are also benefited by use of the present dewaxing aid combination.
Use of the combination dewaxing aid results in an improvement in feed filter rate and liquids/solids. ratio in the dewaxing process.

REFERENCES:
patent: 3458430 (1969-07-01), Henselman et al.
patent: 3729296 (1973-04-01), Miller
patent: 3904385 (1975-09-01), Sweeney
patent: 4191031 (1980-03-01), Grisham, Jr.
patent: 4406771 (1983-09-01), Briens et al.
patent: 4451353 (1984-05-01), Briens et al.

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