Full N,N-Methylation of 4,4′-Methylenedianiline with Dimethyl Carbonate: A Feasible Access to 4,4′-Methylene bis(N,N-Dimethylaniline)

Table 3

The effect of the reaction conditions on the formation of MBDMA over NaY zeolites.

Run	Reaction temperature/°C	Reaction; time/h	m(NaY)/m(DMC); g/g	n(DMC)/n(MDA); mol/mol	MDA conversion; /%	MBDMA
						Yield; /%	Selectivity; /%
1	120	6	0.07	30	61.2	0.0	0.0
2	150	6	0.07	30	96.5	22.7	23.5
3	160	6	0.07	30	100	39.2	39.2
4	170	6	0.07	30	100	56.5	56.5
5	180	6	0.07	30	100	91.1	91.1
6	190	6	0.07	30	100	97.4	97.4
7	200	6	0.07	30	100	97.5	97.5
8	190	0.2	0.07	30	96.1	13.2	13.7
9	190	0.5	0.07	30	100	26.6	26.6
10	190	2	0.07	30	100	65.1	65.1
11	190	4	0.07	30	100	94.2	94.2
12	190	6	0.07	30	100	97.4	97.4
13	190	7	0.07	30	100	97.4	97.4
14	190	6	0.01	30	100	67.1	67.1
15	190	6	0.03	30	100	96.2	96.2
16	190	6	0.05	30	100	96.8	96.8
17	190	6	0.07	30	100	97.4	97.4
18	190	6	0.09	30	100	97.5	97.5
19	190	6	0.07	15	100	87.6	87.6
20	190	6	0.07	20	100	96.2	96.2
21	190	6	0.07	25	100	96.5	96.5
22	190	6	0.07	30	100	97.4	97.4
23	190	6	0.07	35	100	97.4	97.4