ChemicalBook CAS DataBase List 1,4-PENTADIENE

1,4-PENTADIENE synthesis

9synthesis methods

Product Name:1,4-PENTADIENE
CAS Number:591-93-5
Molecular formula:C5H8
Molecular Weight:68.12

109-66-0
421 suppliers
$10.00/25ml

513-35-9 Synthesis

513-35-9
171 suppliers
$12.00/25g

1574-41-0
39 suppliers
$239.00/1g

2004-70-8
55 suppliers
$72.00/1mL

591-93-5
43 suppliers
$38.50/1g

627-20-3 Synthesis

627-20-3
49 suppliers
$42.70/1g

646-04-8 Synthesis

646-04-8
62 suppliers
$45.00/500mg

109-67-1 Synthesis

109-67-1
159 suppliers
$35.00/25 g

563-46-2
79 suppliers
$40.00/5 g

563-45-1
117 suppliers
$15.00/5 g

Yield:-

Reaction Conditions:

with hydrogen at 525; under 760.051 Torr; for 8 h;Reagent/catalyst;

Steps:

27 Example 27: Normal Pentane Dehydrogenation
All of the catalysts from Examples 2-25 (Catalysts A-X) were tested for dehydrogenation of n-pentane in a fixed bed reactor. Each of the catalysts (0.75 grams each) were tested for 8 hours on stream at 525° C. under atmospheric pressure, which reflects the relatively high stability of these catalysts. A feed of liquid n-pentane was supplied at a rate of 0.04 milliliters per minute (mL/min), such that the weight hourly space velocity was 2 per hour. The diluent gas used for each of the tests was a mixture of hydrogen (H₂) and nitrogen (N₂). The diluent gas was provided at a flow rate of 81.4 mL/min. For each of the catalysts, the ratio of hydrogen to steam in the diluent gas was varied as follows: 81.4 mL/min of H₂and 0 mL/min of N₂(pure hydrogen); 71.4 mL/min of H₂and 10 mL/min of N₂; 61.4 mL/min of H₂and 20 mL/min of N₂; 51.4 mL/min of H₂and 30 mL/min of N₂; 41.4 mL/min of H₂and 40 mL/min of N₂; 31.4 mL/min of H₂and 50 mL/min of N₂; 21.4 mL/min of H₂and 60 mL/min of N₂; 11.4 mL/min of H₂and 70 mL/min of N₂; and 0 mL/min of H₂and 81.4 mL/min of N₂(pure nitrogen). It was found that a ratio of 11:70 of H₂:N₂in the diluent gas provided maximum yields of the desired product (n-pentenes), and the results corresponding to this ratio are provided in Table 2. As shown in Table 2, although control Catalyst A (zirconia-free) exhibited the greatest dehydrogenation activity (conversion of n-pentane), it also exhibited relatively high hydroisomerization and isomerization activity (producing isopentane and branched pentenes) along with cracking and hydrocracking activity. In contrast, n-pentane conversion for zirconia-containing catalysts (Catalysts B through F) resulted in greater combined selectivity for normal pentenes and pentadienes and in a greater yield for normal pentenes (reaching a maximum of 45.6 mol. % and a minimum of less than 3 mol % selectivity for branched pentenes) in comparison to control Catalyst A. Furthermore, catalysts containing zirconia and ion-exchanged with potassium (Catalysts J through X) yielded greater selectivity for normal pentenes and pentadienes and lesser selectivity (less than 4 mol. %) for branched pentenes.