Method for producing propylene by using cracking olefin of carbon four and higher
An olefin and propylene technology, which is applied in the field of adiabatic multi-stage composite fixed-bed reactor for propylene production, can solve the problems of low yield, short catalyst regeneration period, low propylene selectivity and the like
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[0016] The method for producing propylene by cracking olefins of 100,000 tons / year C4 and above is as follows: figure 1 Shown is a two-stage composite fixed-bed reactor. Reactor diameter D = 1700 mm, tangent height 7400 mm, first stage catalyst bed height H 1 =980mm, the second stage catalyst bed height H 2 =700mm, the first stage reaction temperature is 470℃, the space velocity is 8.6 hours -1 , The second stage reaction temperature is 550℃, space velocity is 12 hours -1 , Total airspeed 5 hours -1 , Using the molar ratio of silicon to aluminum (SiO 2 / Al 2 O 3 ) Is 200 ZSM-5 molecular sieve catalyst, the reaction raw material is ethylene plant etherified carbon four, the main target product propylene yield and conversion rate change with time are shown in Table 1, after 250 hours, the conversion rate decreased from 71.69% to 57.03 %, but the selectivity of propylene is improved, and the propylene yield is stable at 21.0-23.0% and basically unchanged.
[0017] Table 1 Changes in ...
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