Preparation of Isoamyl Acetate by High Performance ZSM-5 Zeolite Membrane

Abstract

A high performance ZSM-5 zeolite membrane is applied to remove H 2 O from the esteri cation of acetic acid and isopentanol by pervaporation. The in uences of reaction conditions on the isoamyl acetate yield are studied in detail. Compared with the traditional esteri cation of acetic acid and isopentanol, the esteri cation with "membrane extractor" has a well isoamyl acetate yield at low reaction temperature. With the reaction temperature, acetic acid/isopentanol molar ratio and e ective membrane surface area to esteri cation mixture ratio volume of 100°C, 3.0/1.0, 2.0 wt% NaHSO 4 , and 0.26 cm 2 /cm 3 , respectively, the isoamyl acetate yields was 98.39%, the membrane ux and separation factor (H 2 O to organic) were 0.21 kg·m 2 ·h 1 and 1040, respectively. Further, the ZSM-5 zeolite membrane shows good long-term stability and reproducibility for the pervaporation-esteri cation, the isoamyl acetate yields of the esteri cation-pervaporation for intermittent 8 times or continuous 160 h still remained at 97.73% and 98.30%, respectively. In addition, the ZSM-5 zeolite membrane still retained the typical MFI di raction peaks and morphology by XRD and SEM characterization after long-term PV-esteri cation .

Zeolite-Based Catalysts: A Valuable Approach toward Ester Bond Formation

“…The final conversion of the reaction improved from 78.2% to 98.6% for the esterification coupled with VP at a 2:1 molar ratio of alcohol to acid and at 373 k in 420 min [100]. Xue et al [101] investigated the application of ZSM-5 zeolite membrane in acetic acid esterification with isopentanol by pervaporation. The results showed that under optimal reaction conditions, the isoamyl acetate yield was 98.39% [101].…”

“…Xue et al [101] investigated the application of ZSM-5 zeolite membrane in acetic acid esterification with isopentanol by pervaporation. The results showed that under optimal reaction conditions, the isoamyl acetate yield was 98.39% [101].…”

Thermodynamic and Kinetic Study on the Catalysis of Isoamyl Acetate by a Cation-Exchange Resin in an Intensified Fixed-Bed Reactor

“…Because of its special aroma, it is widely used as an additive in foods, tobacco, flavors and fragrances, daily chemical products, and other industries. − Isoamyl acetate is synthesized from acetic acid and isoamyl alcohol, catalyzed by inorganic acids (such as sulfuric acid). To solve the problems of equipment corrosion and environmental pollution, in recent years, molecular sieves, solid superacids, − ionic liquids, heteropoly acids, zeolites, − lipase, supercritical carbon dioxide, , and many other new catalysts have been used in the synthesis of isoamyl acetate. Compared to liquid acids and solid acids, cation-exchange resins have considerable advantages, such as good chemical stability, easy separation and recovery, and high catalytic activity and selectivity, and cation-exchange resins such as CT175, , IR-120, , and T-63 have been reported.…”

A pronounce approach on the catalytic performance of mesoporous natural silica toward esterification of acetic acid with iso‐amyl, benzyl, and cinnamyl alcohols

“…Literature survey provided numbers of solid acid catalysts used to synthesize isoamyl acetate, including Cs or K substituted H 3 PW 12 O 40 , [17] ion-exchange resin, [18] cation-exchange resin, [19] carbon-supported nano-H 3 PW 12 O 40, Purolite CT-175, [2] Fe 3 O 4 @SiO 2 -SO 3 H, [20] H-ZSM-5, [21,22] expandable graphite catalyst, [23] and benzyl acetates, including zeolites, [24,25] silico-tungstic acid/ zirconia/SBA-15, [26] anion modified ZrO 2 , Al 2 O 3, and SiO 2 . [27] While for cinnamyl acetates' production, no solid acid catalysts are used, only enzyme catalysts were utilized.…”