1. Technology Summarize
The combined production technology of methanol to propylene and butylene (CMTX) is a newly emerged methanol versatile utilization technology which developed under collaborated endeavor between Shanghai Bi Ke Clean Energy Company (Clean Energy Commercialization Company, CECC), Shaanxi Coal and Chemical Industry Group Research Institute, and Shanghai Hoto Engineering Inc. By introducing in CMTX catalyst and loop fluidized bed reactor conversion process, CMTX uses methanol as feeding raw material to produce propylene and mixed aromatics from olefin-rich intermediate products through further separation process.
2. Technology Advantages
CMTX featuring its methanol single pass conversion≮99.8%, propylene single pass selectivity≮38%, and butylene single pass selectivity≮24%.
CMTX technology highlights these technical advantages:
Final products mainly targeting at butylene and propylene of which the mass ratio of i-butylene>40wt.%.
Reaction temperature distributed evenly and reaction heat is easily to remove, products selectivity could maintain quite a stable level.
Catalyst is featuring with strong resistance to carbon laydown and low coking rate (0.06%), coefficient of utilization of methanol is high.
Reactor highlights its high space-velocity, low water to methanol ratio, and smaller size.
Continuous catalyst reactivation under relatively low temperature (360-400℃), smaller size of regeneration column which leads to higher energy efficiency.
Proprietary olefin separation process featuring higher olefin yield and lower energy consumption.
3. Process Flow
Methanol is injected into fluidized bed reactor after vaporization and heating, where methanol will be converted to high carbon olefin-rich product gas by catalyst. The reaction heat of product gas will be properly recovered while the product gas will be further cooled down in chilling water column and compressed into separation and distillation unit where the final products which consists of propylene, butylene, and mixed aromatics are produced.
4. Application Prospect
CMTX is not only suitable for constructing medium or large scale installation in coal-methanol rich areas, but also capable of meeting the requirements in offshore areas where imported methanol is used as feedstock for medium or large scale installation.
High carbon olefin becomes gradually in short supply in nowadays under the circumstances that ethylene and propylene is acquired through other technical routes such as propane pyrolysis / propane dehydrogenation. The products of CMTX technology is aiming mainly to high carbon olefin such as butylene and pentene, and it is believed that CMTX technology have extensive prospect of application and may provide useful supplement to the current market.