Propene production from ethanol

Methanol conversion to hydrocarbons has been studied In a flow micro reactor using a mixture of C-methanol and ordinary C-ethene (from ethanol) or propene (from Isopropanol) over SAPO-34, H-ZSM-5 and dealumlnated mordenlte catalysts In a temperature range extending from 300 to 450 °C. Space velocities (WHSV) ranged from 1 to 30 h. The products were analyzed with a GC-MS Instrument allowing the determination of the Isotopic composition of the reaction products. The Isotope distribution pattern appear to be consistent with a previously proposed carbon pool mechanism, but not with consecutive-type mechanisms. 

As a means of obtaining additional information on the methanol to hydrocarbons reaction over zeohtes we have investigated the reaction between C labeled methanol and ( C) ethene or propene (made in situ from ethanol or isopropanol) over SAPO-34, H-ZSM-5, and dealumlnated mordenlte. The isotopic composition of the reaction products was measured by GC-MS. 

The selective production of methanol and of ethanol by carbon monoxide hydrogenation involving pyrolysed rhodium carbonyl clusters supported on basic or amphoteric oxides, respectively, has been discussed. The nature of the support clearly plays the major role in influencing the ratio of oxygenated products to hydrocarbon products, whereas the nuclearity and charge of the starting rhodium cluster compound are of minor importance. Ichikawa has now extended this work to a study of (CO 4- Hj) reactions in the presence of alkenes and to reactions over catalysts derived from platinum and iridium clusters. Rhodium, bimetallic Rh-Co, and cobalt carbonyl clusters supported on zinc oxide and other basic oxides are active catalysts for the hydro-formylation of ethene and propene at one atm and 90-180°C. Various rhodium carbonyl cluster precursors have been used catalytic activities at about 160vary in the order Rh4(CO)i2 > Rh6(CO)ig > [Rh7(CO)i6] >... 

Earlier we looked at the formation of 2-bromopropane when hydrogen bromide was added to propene, and also the formation of ethanol from ethene reacting with dilute sulphuric acid. Suggest what would be the product of the reaction between propene and dilute sulphuric acid. 

A mixture of l,3-diphenyl-2-propen-l-one, la (0.42 g, 2 mmol) and ammonium acetate (0.16 g, 2.2 mmol) in the presence of a catalytic amount of acetic acid was stirred at 100°C for 4h (progress of the reaction followed by TLC monitoring). The reaction mixture was then cooled to room temperature and the crude solid obtained was recrystallized from absolute ethanol. The product 2 a was obtained in 91% yield as colorless crystals, mp 134-135 °C. 

Besides ethanol, large quantities of ethyl ether are produced by the sulfuric acid absorption process from ethylene. In the hydration of ethylene by this method the relative proportions of alcohol and ether obtained are determined by the temperature and concentration of the sulfuric acid solution at the hydration and recovery stage. The more dilute the acid, the higher the proportion of alcohol formed and vice versa. This same process has been applied to the formation of isopropyl ether from propene and this product is now available in tank car lots. 

Table indicates that only a fraction of the C label from ethene was incorporated into chain growth products on Co and Fe catalysts. About the same amount of C (31%) was found in FT products formed with 1[ C]-1-propene, but only 18% when l-[ C]-l-hexadecene was applied.I About 50% of radioactive ethene gave methane, and 50% chain growth products on a Co catalyst, I the specific activity of higher products being practically constant between C4 and C32. Less than 10% of C from labelled ethene was incorporated into C10-C17 products, but the incorporation from C-ethanol was 60-80 times higher on a fused iron catalyst.The difference... 

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