Table 3. Demulsification Efficiency for DNPA-6, DNPA-5, and DNPA-4 at 60 °C^a.

		crude oil/water composition
		90/10		70/30		50/50
compound	dosage (ppm)	η %	t (min)	η %	t (min)	η %	t (min)
DNPA-6	250	10	140	13	180	40	60
	500	60	120	13	150	48	45
	1000	80	100	33	130	80	40
DNPA-5	250	10	120	25	170	20	75
	500	80	120	33	150	44	60
	1000	100	100	33	120	76	50
DNPA-4	250	5	140	33	150	10	90
	500	12	120	33	120	24	75
	1000	25	120	46	100	56	65
ARBREAK 8846	250	35	400	100	380	100	300
	500	48	370	100	350	100	240
	1000	62	350	100	300	100	190

^aThe blank sample (at 0 ppm of demulsifier) showed no water separation for more than 2 weeks at 60 °C.