Process for producing a stream comprising ethylene glycol
A technology of ethylene glycol and propylene glycol, which is applied in the field of preparing streams including ethylene glycol, and can solve problems such as reducing overall revenue
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Embodiment 1
[0206] Embodiment 1: batch hydrogenation reaction
[0207] A 150 ml volume of Stream 1 and 1.25 g of 2% Ru / C catalyst (Johnson Mattthey Extrudate Model 642, ground to powder form prior to use) was added to a 300 ml stainless steel batch reactor (Parr Instrument). The reactor was sealed, flushed with nitrogen and finally pressurized with hydrogen at a temperature of 25° C. and a pressure of 20 bar. The reactor was heated to 85°C in 30 minutes, then held at 85°C for 30 minutes, and cooled down to 25°C in 35 minutes. The reaction mixture was separated from the catalyst by filtration on a 0.22 μm PTFE filter and analyzed by HPLC. The compositions of liquid sugar stream 1 and hydrogenation mixture are reported in Table 3.
[0208]
[0209] Table 3. Composition of Liquid Sugar Stream 1 and Hydrogenation Mixture of Example 1
Embodiment 2
[0210] Embodiment 2: batch hydrogenation reaction
[0211] A 150 ml volume of Stream 2 and 1.25 g of 2% Ru / C catalyst (Johnson Mattthey Extrudate Model 642, ground to powder form prior to use) was added to a 300 ml stainless steel batch reactor (Parr Instrument). The reactor was sealed, flushed with nitrogen and finally pressurized with hydrogen at a temperature of 25° C. and a pressure of 20 bar. The reactor was heated to 100°C in 30 minutes, then held at 100°C for 60 minutes, and cooled down to 25°C in 35 minutes. The reaction mixture was separated from the catalyst by filtration on a 0.22 μm PTFE filter and analyzed by HPLC. The compositions of the liquid sugar stream 2 and the hydrogenation mixture are reported in Table 4.
[0212]
[0213] Table 4. Composition of Liquid Sugar Stream 2 and Hydrogenation Mixture of Example 2
Embodiment 3
[0214] Embodiment 3: continuous hydrogenation reaction
[0215] A stainless steel tubular reactor (h 40 cm, i.d. 2 cm) was filled with 2% Ru / C catalyst (Johnson Matthey Extrudate model 642) and glass beads. The catalytic bed consists of 4cm glass beads The upper layer, the catalyst layer of 25cm (the catalyst extrudates are ground and sieved, ) and a bottom layer of 11 cm glass beads. The reactor was purged with nitrogen and pressurized with hydrogen at 60 bar at room temperature. The hydrogen flow rate was then set at 37 ml / min. The reactor was then heated to 110 °C within 40 min, and once the reaction temperature was reached, the liquid sugar stream 3 was continuously fed to the catalyst bed at 0.5 ml / min by the HPLC pump to have about 1.5 h -1 The liquid hourly space velocity (hourlyspacevelocity). Samples of the reaction solution were continuously taken from the collection tank and analyzed by HPLC. The compositions of liquid sugar stream 3 and hydrogenation mixt...
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