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- Title
Performance analysis of methanol to olefins process in fluidized bed reactor.
- Authors
Qi Guozhen; Xie Zaiku; Chen Qingling
- Abstract
The flow fluidized bed reactor was applied to methanol-to-olefins research after some necessary improvements of traditional fixed flow bed reactor. Methanol decomposition probability before contacting the catalysts could be decreased to the lowest level by adjusting the pre-heater temperature and changing the material of descending feed pipe. The results of device repeatability and material balance investigation showed this reactor had good data repeatability and could achieve 97% of mass balance. The experiments about the effect of reaction temperature and water/methanol mass ratio on main products distribution were carried out based on the SA-PO-34 molecular sieve catalysts. The results of temperature experiments showed the temperature increase improved the ethylene selectivity greatly. As well as speed up the coke formation, the methanol conversion was almost 100%, and the C2= ~C4= selectivity could be over 90%. For ethylene as main product, the reaction temperature was suggested to choose 500 °C with C2= / C3= molar ratio of 1. 5. For propylene as main product, the reaction temperature of 450~470 °C should be chosen with C2= / C3= molar ratio of 0. 9~1. 1. The results of water/methanol mass ratio experiment showed that increasing the water content could not only delay the coke formation rate, but also increase the ethylene selectivity remarkably, which could put the C2= / C3= molar ratio up to more than 2. 0. Too much water would increase the energy consume and the load of reactor and products separator unavoidably no matter for ethylene or propylene as main products. Therefore, water/methanol mass ratio of 0. 25~0. 5 was advocated.
- Subjects
FLUIDIZED bed reactors; METHANOL; ALKENES; CHEMICAL decomposition; CATALYSTS; MOLECULAR sieves; ETHYLENE; WATER
- Publication
Chemical Engineering of Oil & Gas / Shi You Yu Tian Ran Qi Hua Gong, 2013, Vol 42, Issue 3, p242
- ISSN
1007-3426
- Publication type
Article
- DOI
10.3969/j.issn.1007-3426.2013.03.008