Production of low fine sediment high TBN phenate stearate

(19)

(11)

EP 0 761 648 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	26.03.1997 Bulletin 1997/13

(43)	Date of publication A2:
	12.03.1997 Bulletin 1997/11

(21)	Application number: 96306180.9

(22)	Date of filing: 23.08.1996

(51)	International Patent Classification (IPC)⁶: C07C 323/20, C10M 159/22

(84)	Designated Contracting States:
	DE FR GB NL

(30)

Priority:

23.08.1995 US 2716

(71)	Applicant: CHEVRON CHEMICAL COMPANY
	San Francisco, California 94105 (US)

(72)	Inventors:
	CAMPBELL, Curtis B. Hercules, California 94547 (US) FRIDIA, Christopher S. New Orleans, Louisiana 70130 (US)

(74)	Representative: Nash, David Allan
	Haseltine Lake & Co. Hazlitt House 28 Southampton Buildings Chancery Lane GB-London WC2A 1AT GB-London WC2A 1AT (GB)

(54)	Production of low fine sediment high TBN phenate stearate

(57) An overbased phenate stearate is produced by overbasing a mixture that comprises sulfurized phenate, metal stearate (such as calcium stearate), at least one solvent, calcium hydroxide, and water, by contacting the mixture with carbon dioxide in the presence of an alkyl polyhydric alcohol, such as ethylene glycol. The level of agitation is maintained at a level sufficiently high so that all solids are suspended over the length of the overbasing step. The polyhydric alcohol to water ratio is maintained sufficiently high so that the ratio is at least 4:1 at the end of the overbasing step. The overbased mixture is stripped to produce an overbased phenate stearate having less than 0.10 vol.% fine sediments.

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