Effect of Temperature on the Chemical Composition and Physicochemical Properties of Diester Aviation Lubrication Oil

Table 1

Compounds in oil samples, as determined from total ion chromatograms.

Peak	RT (min)	Compounds	CAS number	Chemical formula	Molecular weight	Structural formula	Relative content (%)
							DEr	DE180	DE200	DE230	DE250	DE270	DE300
Hydrocarbon
1	1.571	(1R,2R)-1,2-dimethylcyclopentane	822-50-4	C7H14	98								0.013
2	1.656	2-Methyl-4-methylene hexane	3404-80-6	C8H16	112					0.093	0.144	0.302	1.344
8	4.687	Hexadec-1-ene	629-73-2	C16H32	224								0.009
9	4.755	(Z)-hexadec-3-ene	34303-81-6	C16H32	224								0.014
10	4.865	(Z)-hexadec-8-ene	35507-10-9	C16H32	224								0.006
11	5.171	5,6-Dipropyldecane	1678-97-3	C16H34	226		0.011	0.012	0.010	0.011	0.009	0.008	0.019
Alcohols
3	2.161	2-Ethylhexan-1-ol	104-76-7	C8H18O	130		0.043	0.064	0.136	0.610	0.552	0.704	0.643
Esters
4	2.640	2-Ethylhexyl acetate	103-09-3	C10H20O2	172								0.086
5	3.160	2-ethylhexyl isobutyrate	35061-61-1	C12H24O2	200								0.019
6	3.742	2-Ethylhexyl butyrate	25415-84-3	C12H24O2	200							0.014	0.028
7	4.474	2-Ethylhexyl pentanoate	5451-87-6	C13H26O2	214							0.019	0.054
12	5.260	2-Ethylhexyl hexanoate	16397-75-4	C14H28O2	228			0.020	0.009			0.014	0.036
14	5.990	2-Ethylhexyl 2-ethylhexanoate	7425-14-1	C16H32O2	256		0.018	0.015	0.015	0.022	0.018	0.018	0.025
16	6.824	2-Ethylhexyl 2-methoxyacetate	1000282-41-4	C11H22O3	202							0.018	0.168
17	6.881	2-Ethylhexyl octanoate	63321-70-0	C16H32O2	256						0.012	0.023	0.068
18	7.702	2-Ethylhexyl isobutyl carbonate	1000357-82-9	C13H26O3	230		0.025	0.045	0.029	0.207	0.470	0.785	3.123
19	7.916	2-Ethylhexyl decanoate	73947-30-5	C18H36O2	284								0.073
21	9.358	Isopentyl undec-10-enoate	10214-27-4	C16H30O2	256		0.022	0.033	0.036	0.024	0.036	0.018
24	11.189	Ester			370								0.466
27	11.893	Bis(2-ethylhexyl) adipate	103-23-1	C22H42O4	370		1.752	1.692	1.628	1.651	1.644	1.665	1.743
30	12.527	1-butyl 10-(2-ethylhexyl) decanedioate	1000354-19-9	C22H42O4	370			0.085	0.78	0.115	0.138	0.143	0.213
34	12.998	1-(2-Ethylhexyl) 10-isobutyl decanedioate	1000354-19-8	C22H42O4	370								0.085
46	14.913	Isomer of 47	122-62-3	C26H50O4	426		0.360	0.468	0.383	0.516	0.344	0.467	0.210
47	15.658	Bis(2-ethylhexyl) decanedioate	122-62-3	C26H50O4	426		85.712	84.436	85.89	84.443	85.367	83.533	78.412
49	16.899	1,2,3-Propanetri-carboxylicacid	070289-34-8	C21H38O7	402		0.145	0.163	0.182	0.175	0.208	0.307	0.210
51	18.491	Bis(2-ethylhexyl) dodecanedioate	19074-24-9	C28H54O4	454		2.122	2.113	1.959	2.186	2.036	1.899	2.335
53	23.722	2-Ethylhexyl octadecyl oxalate	1000357-85-7	C28H54O4	454							0.065	0.380
Additives
20	9.074	(E)-4,4'-(ethene-1,2-diyl)dianiline	7314-06-9	C14H14N2	210		0.086	0.088	0.075	0.068	0.089	0.080	0.057
22	10.513	N-Phenyl-1-naphthylamine	90-30-2	C16H13N	219		1.044	1.232	0.981	0.884	0.858	0.787	0.865
25	11.338	N-(2-methylheptan-2-yl)-N-phenylaniline	1000370-31-3	C20H27N	281		0.173	0.168	0.168	0.163	0.149	0.169	0.123
26	11.465	Bis(4-(tert-butyl)phenyl)amine	1000370-31-1	C20H27N	281		0.075	0.063	0.074	0.057	0.069	0.066	0.041
28	12.085	Triphenyl phosphate	115-86-6	C18H15O4P	326		0.729	0.708	0653	0.699	0.711	0.752	0.886
29	12.471	Isomer of 31		C19H17O4P	340			0.096	0.15	0.096	0.087	0.099	0.103
31	12.668	Diphenyl o-tolyl phosphate	5254-12-6	C19H17O4P	340		1.399	1.381	1.294	1.340	1.305	1.275	1.615
32	12.891	Diphenyl p-tolyl phosphate	78-31-9	C19H17O4P	340		0.895	0.872	0.832	0.874	0.796	0.806	0.912
36	13.292	Phenyl di-p-tolyl phosphate	034909-69-8	C20H19O4P	354		1.47	1.423	1.281	1.449	1.342	1.366	1.571
38	13.556	Isomer of 36		C20H19O4P	354		0.935	1.146	1.035	0.941	0.989	0.881	1.23
40	13.831	Isomer of 36		C20H19O4P	354		0.532	0.528	0.437	0.427	0.394	0.537	0.343
41	13.931	Isomer of 43		C21H21O4P	368		0.231	0.335	0.276	0.253	0.248	0.321	0.292
42	13.980	Isomer of 43		C21H21O4P	368		0.396	0.388	0.322	0.329	0.265	0.379	0.328
43	14.289	Tri-m-tolyl phosphate	563-04-2	C21H21O4P	368		0.891	0.897	0.786	0.806	0.784	0.851	0.904
44	14.619	Tri-p-tolyl phosphate	78-32-0	C21H21O4P	368			0.206	0.217	0.215	0.246	0.272
50	17.893	Dioctyl diphenylamine	101-67-7	C28H43N	393		0.147	0.163	0.162	0.151	0.124	0.187	0.154
52	19.038	Bis(4-(2,4,4-trimethylpentan-2-yl)phenyl)amine	15721-78-5	C28H43N	393		0.034
Others
13	5.444	Unknown			240			0.018	0.008
15	6.068	Unknown			240		0.039	0.029	0.04	0.044	0.047	0.051	0.109
23	10.811	Unknown											0.041
33	12.956	Isomer of 33			354		0.182	0.177	0.177	0.207	0.149	0.138	0.101
35	13.06	1-((7-Methoxybenzo[d][1,3]dioxol-5-yl)methyl)-4-(3-methylbenzyl)piperazine	100294-50-4	C21H26N2O3	354		0.159	0.170	0.137	0.154	0.128	0.151	0.122
37	13.479	Unknown			368		0.135	0.154	0.119	0.130	0.103	0.127	0.101
39	13.598	Unknown			368			0.281	0.192	0.204	0.198	0.240	0.189
45	14.692	(E)-1-benzyl-2-((2,6-dimethyltetrahydro-[1,3]dioxino[5,4-d][1,3]dioxin-4-yl)methylene)-1-phenylhydrazine	1000129-05-9	C22H26N2O4	382			0.331	0.257	0.34	0.32	0.310
48	16.664	Unknown								0.128	0.085	0.078	0.1

RT: retention time.