	US 12,076,669 B2
	Processing of filtered rolling oil and filtering agents
Stephan Draese, Nettetal (DE); Olaf Güßgen, Cologne (DE); and Oliver Seiferth, Cologne (DE)
Assigned to Hydro Aluminum Rolled Products GmbH, Grevenbroich (DE)
Filed by Stephan Draese, Nettetal (DE); Olaf Güßgen, Cologne (DE); and Oliver Seiferth, Cologne (DE)
Filed on Apr. 17, 2020, as Appl. No. 16/851,494.
Application 16/851,494 is a continuation of application No. PCT/EP2018/077917, filed on Oct. 12, 2018.
Claims priority of application No. 17196872 (EP), filed on Oct. 17, 2017.
Prior Publication US 2020/0238195 A1, Jul. 30, 2020
Int. Cl. B01D 3/10 (2006.01); B01D 5/00 (2006.01); B01D 37/02 (2006.01); C02F 1/00 (2023.01); C02F 1/28 (2023.01); C10M 175/00 (2006.01)

CPC B01D 3/10 (2013.01) [B01D 5/006 (2013.01); B01D 37/02 (2013.01); C02F 1/001 (2013.01); C02F 1/28 (2013.01); C10M 175/0033 (2013.01)]

13 Claims

1. A method for the recovery of filter aids and rolling oil from a mixture containing used rolling oil and filter aids contaminated with used rolling oil, comprising the steps of:

subjecting the mixture to vacuum distillation involving stirring in a reactor equipped with an agitator and vapor filter,

controlling the vacuum during distillation through the flow of inert gas,

condensing and collecting the rolling oil, whereby a recyclable rolling oil and a pulverized recyclable filter aid are obtained.