Low-carbon olefin production technology (RHMTP)
Ruihua C4 cracking unit is transformed into methanol to propylene production technology, which can be used to produce propylene, ethylene, liquefied petroleum gas and aromatic gasoline. This technology is highly adaptable to the market, and the product scheme can be adjusted according to demand, and it is very competitive in small and medium-sized industrial applications.
The raw material for this technology can start from methanol or dimethyl ether. When the starting material is methanol, two reactors are required. One is the front reactor for methanol reaction to generate dimethyl ether, and the other is the reaction of the generated dimethyl ether to continue to generate low-carbon olefins, mainly propylene. When the starting material is dimethyl ether, only one dimethyl ether is required to generate low-carbon olefins mainly composed of propylene.
This technology is used in the transformation of old equipment (carbon four cracking), which can use more original equipment, saving investment for enterprises and creating more profits.
The reaction with methanol as the raw material first passes through a fixed bed reactor to produce dimethyl ether. The produced dimethyl ether is divided into two strands and enters the multi-stage fixed bed reactor. One strand of the main material is mixed with low-pressure steam and enters from the top of the reactor. In the first bed, the other is divided into seven streams and mixed with low-pressure steam respectively and enters the second to eighth beds from the seven sections of the reactor. After the reactor discharge is quenched and recovered, the absorption is stable and the gas is separated, the products propylene, ethylene, liquefied petroleum gas and aromatic gasoline are separated.
The product propylene in this process is polymerization grade, ethylene can reach polymerization grade, liquefied gas (mainly carbon four), aromatic gasoline (can be used for gasoline blending components to increase octane number). According to different recycling processes, the yield of propylene can reach up to 25%, and the yield of ethylene can reach up to 8%.
The raw material methanol must meet the requirements of GB 338-2011.
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