Propylene in the progress of olefins conversion technology - propylene, yield, conversion technology

Propylene in the progress of olefins conversion technology - propylene

, yield, conversion technology

HC WIRE: In recent years, due to the downstream products of propylene and propylene chain of fast-growing shortage of supply, foreign companies eager to develop new Propylene to improve the steam cracking and catalytic cracking process propylene yield. The late 20th century, 80, China developed ARGG, DCC-I, DCC- , C PP And HCC and other FCC technologies, the majority of processes have been industrialized. FCC olefin technology with advanced conversion technologies, with olefins conversion technology and the use of catalytic cracking products of ethylene propylene butylene, propylene in our country has opened up a new way.

1 olefins conversion technology Olefins conversion technology is hydrocarbon conversion technologies. At present, already has nine sets of olefin disproportionation unit in operation, the olefin disproportionation unit or combined with the steam cracker, or a propylene recovery unit combined with the refinery. Combined with the steam cracker can be propylene / ethylene ratio increased to 1-1.25, propylene yield than the only steam cracker liquid raw materials increased by 1 or more; the technology and maximize the production of catalytic cracking unit combined with propylene, propylene yield the largest producer of gasoline-mode technology than 3 times higher.

1.1ABBLummus's OCT Technology

ABBLummus's OCT technology into ethylene propylene selectivity nearly 100%, the selectivity of butene into propylene 97%, total butene 85% -92% conversion rate (butene in the feed is butene content was 50% -95%). The feed of ethylene and butene may be from the steam cracker and various refinery processes, concentration or not the same, also from the ethylene-butene dimerization unit.

OCT technology uses the fixed bed reactor, the catalyst is contained in the diatomite on the WO, and MgO. Continuous catalyst regeneration, catalyst coking coke with nitrogen plus air clean. Raw materials in the 1? Butene isomerization under the action of the MgO into 2? Butene, and then with ethylene propylene generated by the W03 disproportionation. Ethylene tower in separated unreacted ethylene recycled back to reactor, propylene propylene tower can be isolated, because no propane generated in reaction without further purification can be polymer grade propylene. OCT technology process in Figure 1.

1.2IFP of the Meta-4 technology

Compared with the OCT technology, Meta-4 technology utilizes rhenium-based catalysts in the liquid phase under low temperature operation, at 35 , the conversion of one-way balance of 63%. The technology of the propylene selectivity over 98%, 2? Butene conversion rate of 90% mass fraction of ethylene in the product up to 31.2%, propylene content of up to 22.4%, C3 and C2 mass ratio up to 0.72.

Meta-4 technology, including the reaction zone and regeneration zone. Reactor can use fixed-bed reactor can also be used moving bed reactor. All or part of the catalyst deactivation, the removal of organic matter attached to the surface, into the regenerator, can be cycles. Reactor at the top of the liquid sent to the distillation section of the second tower in the carbon recovery of ethylene and then return to the reactor to use. Propylene polymerization in the C4 level propylene isolated tower.

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