Low-temperature LPG project
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1. If a low-temperature LPG tank is used to store C3/C4 mixtures, is there an issue with the high volatility of C3? 2. For low-temperature LPG storage tanks with C3/C4 mixtures, is the energy consumption higher than that of separate storage? 3. C3/C4 mixtures are generally stored in spherical tanks, under low-temperature storage conditions.
1. Propane has a critical pressure of 4.29 MPa and a critical temperature of 96.8°C, while n-butane has a critical pressure of 3.8 MPa and a critical temperature of 152°C. The differences in their melting and boiling points are also not significant; C3 must be less volatile than C4. If C3 and C4 are mixed in a spherical tank,
1. Propane has a critical pressure of 4.29 MPa and a critical temperature of 96.8°C, while n-butane has a critical pressure of 3.8 MPa and a critical temperature of 152°C. The differences in their melting and boiling points are also small; therefore, C3 will vaporize before C4. If C3 and C4 are mixed in a spherical tank, they will both remain in liquid state at a certain pressure. 2. LPG is generally obtained by treating natural gas at low temperatures to extract the liquid phase; separation requires extraction processes, and this step can be added if a large volume is involved. To achieve gas of industrial-grade purity, the cost will be higher – it depends on what purpose you intend to use it for 3. Sphere tanks have excellent pressure resistance, which is why large pressure vessels are generally of spherical design; for storing C3/C4 at low temperatures, normal-pressure or small-pressure vessels are usually used
Hybrid storage results in higher operating costs compared to single-storage systems, but the construction costs are lower; low-temperature underground storage tanks are usually connected to ships. It was cold when it arrived.
Hybrid storage results in higher operating costs compared to single-storage systems, but the construction costs are lower; low-temperature underground storage tanks are usually connected to ships. It was cold when it arrived.
Just to confirm again, ocean-going cryogenic vessels generally use C3/C4 separately, with LPG mixtures as well.
Yes, the liquefied gas we use now is separated into propane and butane; there is also mixed variety, but we have not used that one.