SECTION I (C)
2. Operating Conditions.
Contraction data are given below based on feed gas: CO2:H2=1:3:V/H/V: 4 lit/hr/10 g Fe in catalyst.
|
Non-Alkalized catalyst |
1% K2CO3 in catalyst |
||
|
Temperature |
1 atm. |
15 atm. |
1 atm. |
|
250° C |
8 |
27 |
8 |
|
300° C |
11 |
41 |
14 |
|
350° C |
22 |
44 |
16 |
|
400° C |
21 |
44 |
17 |
|
450° C |
20 |
44 |
17 |
The influence of alkali is the same as in FT operation in that it raises the boiling range of the product. In this case alkali increases the liquid yield. Basis CO2:H2=1:3; 15 atm; 350° C, 2 lit/hr/10 g Fe.
|
% K2 CO3 |
Contraction |
g liquid/m3 |
g gasol/m3 |
|
0.0 |
30 |
3-5 |
1.5 |
|
1.0 |
40 |
16.0 |
11.0 |
Pressure increases the conversion. The following data show the contraction at different pressure:
| Basis: Feed CO2:H2=1:3; 350° C - 2 lit/hr/10 g Fe. |
| 1% alkali in catalyst |
|
Pressure |
Contraction |
g liquid/m3 |
g gasol/m3 |
|
15 atm. |
40 |
16 |
11 |
|
30 atm. |
47 |
24 |
15 |
|
60 atm. |
58 |
39 |
23 |
Upon further increase in pressure the contraction began to decrease. Increased pressure also favors the synthesis of oxygenated compounds analogous to FT synthesis.