Platinum oxide catalyst and bar pressure produce benzene and methane

CHNG3806/ CHNG 9306

Management of Industrial System

Toluene and hydrogen are converted in a reactor packed with chromium, molybdenum, or platinum oxide catalyst at 500-600 °C and 40-60 bar pressure to produce benzene and methane. Typically, the reaction reaches a conversion of 90%. Figure 1 shows the process flow diagram of the process.

Table 1: Flow summary table for the benzene production process

Stream number	1	2	3	4	5	6	8	15	16
Temperature (°C)	25	59	25	225	41	600	38	38	38
Pressure (bar)	1.90	25.8	25.5	25.2	25.5	25.0	23.9	2.3	2.5
Mass Flow	10.0	13.3	0.82	20.5	6.41	20.5	9.2	8.21	2.61
Mole Flow	108.7	144.2	301.0	1204.4	758.8	1204.4	1100.8	105.6	304.2
Component Mole Flow (kmole/h)
Hydrogen	0.0	0.0	286.0	735.4	449.4	735.4	651.9	0.0	178.0
Methane	0.0	0.0	15.0	317.3	302.2	317.3	438.3	0.0	123.05
Benzene	0.0	1.0	0.0	7.6	6.6	7.6	9.55	105.2	2.85
Toluene	108.7	143.2	0.0	144.0	0.7	144.0	1.05	0.4	0.31

Pumps/Compressors		Fluid density (kg/m3)	Power (shaft) (kw)	Type/Drive	Materials of construction	Efficiency
P-101 (A/B)	13,000	870	14.2	Centrifugal	CS	0.75
P-102 (A/B)	22,700	880	3.2	Centrifugal	CS	0.50
C-101 (A/B)	6770	8.02	101	Reciprocating	CS	0.75

	Pressure (bar)	Orientation	Materials of construction	Height /length (m)	Diameter (m)	Thickness (mm)	internals
V-101	2.0	Horizontal	CS	5.9	1.9	15	-
V-102	24	Vertical	CS	3.5	1.1	30	-
V-103	3.0	Vertical	CS	3.5	1.1	15	-
V-104	2.5	Horizontal	CS	3.9	1.3	15	-
T-101	3.0	Vertical	CS	29	1.5	15	42 sieve trays 316SS
R-101	25	Vertical	SS316	14.2	2.3	30

Annual capital charge (ACC) = ACCR × total fixed capital cost