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SuttichaiAssabumrungrat,Tomohiko Tagawa,Piyasan Praserthdam,Garun Tanarungsun,Worapon Kiatkittipong,Suttichai Assabumrungrat,Hiroshi Yamada 한국공업화학회 2007 Journal of Industrial and Engineering Chemistry Vol.13 No.3
of CHD (Eq. 3). In addi-tion, CHD can easily collapse to benzene when the Fe(II) content increased (Eq. 4) and also phenol can be further reacted with excess hydroxyl radicals to yield catechol, hydroquinone, and benzoquinone, resulting in the de-crease of selectivity.It is should be noted that ascorbic acid was highly solu-ble in the aqueous phase, but not in the organic phase. The addition of solvent was necessary to promote the re-action in this system by dissolving H2O2, ascorbic acid, and benzene into one phase. ConclusionThe liquid phase hydroxylation of benzene to phenol with hydrogen peroxide catalyzed by Fe(III)/TiO2 cata-lysts was investigated. The most suitable Fe(III) pre-cursor and %Fe(III) loading were iron(III) acetylaceto-nate and 5 wt%, respectively. Among the solvents stud-ied (acetone, dichloromethane, acetronitrile, pyridine, tert-butyl alcohol, 1-butyl alcohol, and ethyl alcohol), acetone showed the highest conversion and yield, but low selectivity. However, acetronitrile may be an attrac-tive solvent because of its high selectivity. Biphasic op-eration was not attractive compared to triphasic operation because of the dilution effect. Benzene conversion in-creased with increasing the amount of ascorbic acid; however, to much ascorbic acid retarded the yield im-provement because of lower phenol selectivity.AcknowledgmentFinancial support from the Thailand Research Fund and Commission on Higher Education are gratefully acknowledged.
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.
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.