Method and device for separating ethylene and propylene from pyrolysis gas and/or dry gas
A cracking gas and dry gas technology, applied in the chemical industry, can solve the problems of complex refrigeration and heat exchange process, large cooling capacity consumption, low ethylene concentration, etc., achieve wide applicability of raw materials, simplify heat exchange process, and reduce refrigeration load Effect
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Example Embodiment
[0061] Example 1
[0062] In this embodiment, cracked gas produced by steam cracking of light hydrocarbons such as C4, propane and liquefied gas in a refinery is used as a raw material. The specific composition of the cracked gas is shown in Table 1.
[0063] Table 1
[0064]
[0065]
[0066] Use as figure 1 The separation flow chart shown separates ethylene and propylene from cracked gas and / or dry gas.
[0067] The separation device includes a compressor 2, a purification unit 3, a cooler 4, an oil absorption tower 5, a light hydrocarbon separation unit, and an olefin rectification unit. The light hydrocarbon separation unit includes a demethanizer 8, a deethanizer 9, and Propane tower 6 and debutanization tower 7, olefin rectification unit includes ethylene rectification tower 11 and propylene rectification tower 10.
[0068] The compressor 2 is connected to the purification unit 3, the cooler 4, and the oil absorption tower 5 in sequence;
[0069] The top of the oil absorption towe...
Example Embodiment
[0085] Example 2
[0086] In this example, a stream of FCC dry gas is added to the raw material of Example 1, that is, cracked gas and FCC dry gas are processed at the same time. The FCC dry gas is mixed with the cracked dry gas at the outlet of the second stage of the compressor and then sent to the compressor. The third stage: Because the FCC dry gas contains oxygen and carbon dioxide, the mixed gas is sequentially deoxidized, decarbonized and dried in the purification step 3. The specific composition of FCC dry gas is shown in Table 3.
[0087] table 3
[0088]
[0089]
[0090] The operating conditions differ from Example 1 in:
[0091] (4) Absorption: The number of theoretical plates of the oil absorption tower 5 is 40, the operating pressure is 3MPaG, the top temperature is 7.9°C, the outlet temperature of the top condenser is -35°C, and the bottom temperature is 92.4°C;
[0092] (5) Propane removal: The theoretical plate number of the depropanizer 6 is 50, the operating pressur...
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