A method for reversible storage of gas hydrates using hydrogels
A gas hydrate and hydrogel technology, applied in the production of hydrogen and other directions, can solve problems such as hindering the promotion and large-scale application in the industrial field, inability to realize recycling, and damage to the water-dry-water structure. Large-scale production, the effect of improving reversibility
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Embodiment 1
[0038] The prepared finished polymethyl methacrylate hydrogel was completely immersed in deionized water, and left for 24 hours to achieve swelling equilibrium.
[0039] Weigh 50g of polymethyl methacrylate hydrogel that has reached swelling equilibrium, and put it into a 300ml autoclave. The water content of the hydrogel is 60 wt%, and the pore size is 1 μm. Open the inlet valve of the methane gas cylinder, charge methane gas into the 300ml reactor until the pressure stabilizes at 30MPa.
[0040] After the temperature of the reactor was adjusted to 20°C and stabilized, hydrates began to form. The temperature and pressure of the hydration process were measured with a thermal resistance and a pressure sensor, respectively. A sudden drop in pressure was observed while the temperature was rising, indicating the massive formation of hydrates.
[0041] After a period of time, the temperature and pressure tend to be stable, and the hydration process is considered to be over. The...
Embodiment 2
[0048] The prepared finished polyhydroxypropyl methacrylate hydrogel was completely immersed in deionized water, and left for 24 hours to achieve swelling equilibrium.
[0049] Weigh 50g of polyhydroxypropyl methacrylate hydrogel that has reached swelling equilibrium, and put it into a 300ml autoclave. The water content of the hydrogel is 65 wt%, and the pore size is 10 μm. Open the inlet valve of the methane gas cylinder and fill the reactor with methane gas until the pressure is stabilized at 5MPa. At the same time, adjust the temperature of the reactor to 3°C and stabilize, then start to form hydrates. The top view of the network structure of the hydrogel after gas storage is as follows: figure 2 shown. Remaining steps are with embodiment 1. The number of cycle gas storage is 7 times, and the calculated gas storage capacity is 121.6, 116.2, 111.34, 106.5, 101.7, 96.8, 92V / V respectively.
[0050] The principle of reversible gas storage of hydrogel in this embodiment is...
Embodiment 3
[0052] The prepared finished polyhydroxyethyl methacrylate hydrogel was completely immersed in deionized water, and left for 24 hours to achieve swelling equilibrium.
[0053] Weigh 50g of polyhydroxyethyl methacrylate hydrogel that has reached swelling balance, and put it into a 300ml autoclave. The water content of the hydrogel is 70 wt%, and the pore size is 30 μm. Open the inlet valve of the carbon dioxide gas cylinder and fill the reactor with carbon dioxide gas until the pressure is stable at 3MPa. At the same time, adjust the temperature of the reactor to 4°C and stabilize, then start to form hydrates. Remaining steps are with embodiment 1. The number of cycles of gas storage is 4 times, and the calculated gas storage volumes are 95, 89, 84.4, and 79.4 V / V respectively.
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