Effect of the Spilt-Over Hydrogen Species on the Product Yields of the Hybrid Catalysts Used in the Thermocatalytic Cracking (TCC) Process for the Production of Light Olefins

2008 ◽  
Vol 47 (9) ◽  
pp. 2963-2969 ◽  
Author(s):  
R. Le Van Mao ◽  
N. T. Vu ◽  
N. Al-Yassir ◽  
H. T. Yan
Keyword(s):  
Light Olefins ◽  
Product Yields ◽  
Hybrid Catalysts ◽  
Thermocatalytic Cracking

A Neural Network Approach for Prediction of Main Product Yields in Methanol to Olefins Process

2009 ◽  
Vol 7 (1) ◽  
Author(s):  
Reza Nabavi ◽  
Darioush Salari ◽  
Aligholi Niaei ◽  
Mohammad-Taghi Vakil-Baghmisheh
Keyword(s):  
Neural Network ◽  
Main Product ◽  
Weight Fraction ◽  
Light Olefins ◽  
Neural Network Approach ◽  
Product Yields ◽  
Optimum Topology ◽  
Trial And Error Method ◽  
Temperature Water ◽  
Mto Process

The transformation of methanol into olefins (MTO) is gaining interest in view of the strong demand for light olefins by the petrochemical industry. Modeling of MTO process is required for both reactor design and process control. In this paper, a three layer perceptron neural network model is used to predict main product yields in methanol to olefins conversion. The network is fed with three inputs, i.e. the reactor temperature, water/methanol ratios in feed, and space-time to predict the weight fraction of unconverted methanol, ethylene, propylene and butanes. The optimum structure of neural network (NN) is determined by a trial and error method. The performance of basic backpropagation (BBP) training algorithm is compared with backpropagation with declining learning-rate factor algorithm (BDLRF). It is found that BDLRF has a better performance in both training and test phases. The network with optimum topology learns the input-output mappings with enough accuracy for interpolation cases. By using NN model in MTO process developing complex reaction kinetic in both global and hybrid model can be avoided.

Syngas to light olefins over La doped ZnxAlyOz composite and SAPO-34 hybrid catalysts

2021 ◽  
Author(s):  
G. Raveendra ◽  
Baorun Ma ◽  
Xiaohui Liu ◽  
Yong Guo ◽  
Yanqin Wang
Keyword(s):  
Light Olefins ◽  
Direct Transformation ◽  
Hybrid Catalysts ◽  
La Doped

The direct transformation of syngas to light olefins is a highly attractive route for the synthesis of light olefins. The La doped ZnxAlyOz catalyst was prepared with various precipitating agents,...

The Thermocatalytic Cracking Process for the Production of Light Olefins and Transportation Fuels from Gas Oils

2006 ◽  
Vol 37 (2-4) ◽  
pp. 107-112 ◽  
Author(s):  
R. Le Van Mao ◽  
N.-T. Vu ◽  
N. Al-Yassir ◽  
N. François ◽  
J. Monnier
Keyword(s):  
Light Olefins ◽  
Transportation Fuels ◽  
Thermocatalytic Cracking ◽  
Cracking Process

Structural/Texture Evolution During Facile Substitution of Ni into ZSM-5 Nanostructure vs. its Impregnation Dispersion Used in Selective Transformation of Methanol to Ethylene and Propylene

2020 ◽  
Vol 23 ◽  
Author(s):  
Parisa Sadeghpour ◽  
Mohammad Haghighi ◽  
Mehrdad Esmaeili
Keyword(s):  
High Temperature ◽  
Physicochemical Properties ◽  
Active Sites ◽  
Catalytic Performance ◽  
Fixed Bed Reactor ◽  
Light Olefins ◽  
Isomorphous Substitution ◽  
Impregnation Method ◽  
Hydrothermal Temperature ◽  
X Ray

Aim and Objective: Effect of two different modification methods for introducing Ni into ZSM-5 framework was investigated under high temperature synthesis conditions. The nickel successfully introduced into the MFI structures at different crystallization conditions to enhance the physicochemical properties and catalytic performance. Materials and Methods: A series of impregnated Ni/ZSM-5 and isomorphous substituted NiZSM-5 nanostructure catalysts were prepared hydrothermally at different high temperatures and within short times. X-ray diffraction (XRD), Field emission scanning electron microscopy (FESEM), Energy dispersive X-ray (EDX), Brunner, Emmett and Teller-Barrett, Joyner and Halenda (BET-BJH), Fourier transform infrared (FTIR) and Temperature-programmed desorption of ammonia (TPDNH3) were applied to investigate the physicochemical properties. Results: Although all the catalysts showed pure silica MFI–type nanosheets and coffin-like morphology, using the isomorphous substitution for Ni incorporation into the ZSM-5 framework led to the formation of materials with lower crystallinity, higher pore volume and stronger acidity compared to using impregnation method. Moreover, it was found that raising the hydrothermal temperature increased the crystallinity and enhanced more uniform incorporation of Ni atoms in the crystalline structure of catalysts. TPD-NH3 analysis demonstrated that high crystallization temperature and short crystallization time of NiZSM-5(350-0.5) resulted in fewer weak acid sites and medium acid strength. The MTO catalytic performance was tested in a fixed bed reactor at 460ºC and GHSV=10500 cm3 /gcat.h. A slightly different reaction pathway was proposed for the production of light olefins over impregnated Ni/ZSM-5 catalysts based on the role of NiO species. The enhanced methanol conversion for isomorphous substituted NiZSM-5 catalysts could be related to the most accessible active sites located inside the pores. Conclusion: The impregnated Ni/ZSM-5 catalyst prepared at low hydrothermal temperature showed the best catalytic performance, while the isomorphous substituted NiZSM-5 prepared at high temperature was found to be the active molecular sieve regarding the stability performance.

Efficient Production of Light Olefin Based on Methanol Dehydration: Simulation and Design Improvement

2020 ◽  
Vol 23 ◽  
Author(s):  
S. Majid Abdoli ◽  
Mahsa Kianinia
Keyword(s):  
Dimethyl Ether ◽  
Flow Reactor ◽  
New Technology ◽  
Plug Flow ◽  
Light Olefins ◽  
Efficient Production ◽  
Actual Process ◽  
Light Olefin ◽  
Aspen Hysys ◽  
Improved Design

Background: Ethylene, propylene, and butylene as light olefins are the most important intermediates in the petrochemical industry worldwide. Methanol to olefins (MTO) process is a new technology based on catalytic cracking to produce ethylene and propylene from methanol. Aims and Objective: This study aims to simulate the process of producing ethylene from methanol by using Aspen HYSYS software from the initial design to the improved design. Methods: Ethylene is produced in a two-step reaction. In an equilibrium reactor, the methanol is converted to dimethyl ether by an equilibrium reaction. The conversion of the produced dimethyl ether to ethylene is done in a conversion reactor. Changes have been made to improve the conditions and get closer to the actual process design done in the industry. The plug flow reactor has been replaced by the equilibrium reactor, and the distillation column was employed to separate the dimethyl ether produced from the reactor. Result and Conclusion: The effect of the various parameters on the ethylene production was investigated. Eventually, ethylene is

Life Time Improvement of Hierarchically Structured SAPO-34 Nanocatalyst in MTO Reaction via Applying Clinoptilolite, Investigating of Composite Design via RSM

2020 ◽  
Vol 23 ◽  
Author(s):  
Reza Yazdanpanah ◽  
Eshagh Moradiyan ◽  
Rouein Halladj ◽  
Sima Askari
Keyword(s):  
Surface Area ◽  
Natural Zeolite ◽  
Coke Formation ◽  
Life Time ◽  
Weight Percent ◽  
Light Olefins ◽  
Bet Surface Area ◽  
Relative Crystallinity ◽  
Mto Reaction ◽  
The Common

Aim and Objective: The research focuses on recent progress in the production of light olefins. Hence, the common catalyst of the reaction (SAPO-34) deactivates quickly because of coke formation, we reorganized the mechanism combining SAPO-34 with a natural zeolite in order to delay the deactivation time. Materials and Methods: The synthesis of nanocomposite catalyst was conducted hydrothermally using experimental design. Firstly, Clinoptilolite was modified using nitric acid in order to achieve nano scaled material. Then, the initial gel of the SAPO-34 was prepared using DEA, aluminum isopropoxide, phosphoric acid and TEOS as the organic template, sources of Aluminum, Phosphor, and Silicate, respectively. Finally, the modified zeolite was combined with SAPO-34's gel. Results: 20 different catalysts due to D-Optimal design were synthesized and the nanocomposite with 50 weight percent of SAPO-34, 4 hours Crystallization and early Clinoptilolite precipitation showed the highest relative crystallinity, partly high BET surface area and hierarchical structure. Conclusion: Different analysis illustrated the existence of both components. The most important property alteration of nanocomposite was the increment of pore mean diameters and reduction in pore volumes in comparison with free SAPO-34. Due to low price of Clinoptilolite, the new catalyst develops the economy of the process. Using this composite, according to formation of multi-sized pores located hierarchically on the surface of the catalyst and increased surface area, significant amounts of Ethylene and Propylene, in comparison with free SAPO-34, were produced, as well as deactivation time that was improved.

Nano-Structured Ceramic Oxide Catalyst for Syn Gas Conversion to Light Olefins

2012 ◽  
Vol 1 (1) ◽  
pp. 24-31
Author(s):  
Syed Tajammul Hussain ◽  
Nisar Ahmad ◽  
Bakhtiar Muhammad
Keyword(s):  
Oxide Catalyst ◽  
Light Olefins ◽  
Ceramic Oxide ◽  
Gas Conversion

Fission product yields at intermediate energy

1998 ◽  
Author(s):  
V. A. Rubchenya ◽  
J. Äystö ◽  
P. Dendooven ◽  
S. Hankonen ◽  
A. Jokinen ◽  
...  
Keyword(s):  
Fission Product ◽  
Intermediate Energy ◽  
Product Yields ◽  
Fission Product Yields
Sign in / Sign up

Export Citation Format

Share Document