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Suttichai Assabumrungrat,Nattapong Kasempremchit,Piyasan Praserthdam 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.10
We examined the catalyst bed design of MgO and WO3/SiO2 for production of propylene via metathesis of 1-butene. WO3/SiO2 was used as a bi-functional catalyst for isomerization and metathesis reactions. Addition of MgO was proposed to help improve the isomerization activity and hence the propylene yield. Experimental studies were carried out to determine activity and reaction kinetics of 1-butene isomerization over MgO isomerization catalyst and 1- butene metathesis over WO3/SiO2 bi-functional catalyst for designing a suitable catalyst bed. Two types of catalyst bed arrangement--physically mixed bed and separated bed--were considered and compared by computer simulation. The simulations reveal that adding MgO in the separated bed by packing MgO before WO3/SiO2 offers superior propylene yield to the physically mixed bed. The appropriate %MgO loading in catalyst bed which offers a maximum propylene yield was found to vary (3 and 23%), depending on operating condition.
Suttichai Assabumrungrat,Atittahn Wongkia,Kongkiat Suriye,Anuwat Nonkhamwong,Piyasan Praserthdam 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.3
We investigated the catalytic performance improvement of styrene hydrogenation in a trickle bed reactor by using periodic operation. The effects of cycle period and split on relative conversion, which is defined as styrene conversion obtained from periodic operation over that from steady state operation, were examined at various operating conditions including gas and average liquid flow rates, pressure and temperature. The experimental results reveal that both cycle period and split have strong influence on the catalytic performance. The fast mode (short cycle period) is a favorable condition. The improvement by the periodic operation becomes less pronounced for operations at high average liquid flow rate, pressure and temperature. From this study, a maximum improvement of styrene conversion of 18% is observed.
Hybrid reactive distillation systems for n-butyl acetate production from dilute acetic acid
Amornchai Arpornwichanop,Kittipong Koomsup,Suttichai Assabumrungrat 한국공업화학회 2008 Journal of Industrial and Engineering Chemistry Vol.14 No.6
The recovery of dilute acetic acid, regarding as a waste stream in many chemical and petrochemical processes, becomes an important issue due to economic and environmental awareness. In this work, a simulation study on the direct utilization of dilute acetic acid to produce n-butyl acetate via esterification with butanol in a reactive distillation is presented by using Aspen Plus. The performance of a hybrid reactive distillation with a pretreatment unit, i.e., a conventional distillation or a pervaporation, is investigated. For a single reactive distillation system, it is found that higher overall energy of the system is required when the concentration of acetic acid is lowered. By considering the enrichment of acetic acid in the reactive distillation column feed from 35 to 65 wt.%, a hybrid pervaporation–reactive distillation requires lower energy than both the conventional distillation–reactive distillation system and the single reactive distillation.
Wisitsree Wiyaratn,Weerinda Appamana,Suttichai Assabumrungrat 한국공업화학회 2011 Journal of Industrial and Engineering Chemistry Vol.17 No.3
Au/La_(1-x)Sr_xMnO_3 (x = 0.4) was prepared by an ultrasound-driven technique at nanoscale. Physical morphology was characterised using XRD, TEM, BET and SEM-EDS, and its activity was tested in a fixed bed reactor at two different ratios of CH_4/O_2. A 79.6% CO selectivity and a 54.7% CH_4 conversion were obtained at a low CH_4/O_2 ratio; however, at higher CH_4/O_2 ratios, the selectivity of C_2 became significant. With the presence of Au, the CH_4 conversion, H_2 yield and C_2 and CO selectivity were improved.