tailieunhanh - Study on selectivity of tungstate based catalyst in epoxidation reaction of modified and non modified rubber seed oil

The average catalyst selectivity obtained by using H-NMR method of the modified rubber seed oil epoxidation reaction was equal, while of the rubber seed oil epoxidation reaction was 11% lower than that of the titrimetric method. For both types of oils, the difference between the catalytic selectivity obtained by using titration method and by using protons in group α-CH2-(C=O)-O- as the standard peak was the smallest and was the biggest when the protons in group -CH3 was used as the standard peak. | VNU Journal of Science: Natural Sciences and Technology, Vol. 34, No. 4 (2018) 16-20 Study on Selectivity of Tungstate-based Catalyst in Epoxidation Reaction of Modified and Non-modified Rubber Seed Oil Nguyen Thi Thuy*, Nguyen Thanh Liem, Vu Minh Duc Polymer center, Hanoi University of Science and Technology, 1 Dai Co Viet Street, Hanoi, Vietnam Received 02 October 2018 Revised 20 November 2018; Accepted 04 December 2018 Abstract: The selectivity of tungstate-based catalyst in the epoxidation reaction of rubber seed oil and modified rubber seed oil was studied in two ways. The titration method was performed according to the ASTM standard and the H-NMR method was based on the peaks of the three different standard groups. The catalyst selectivity of the epoxidation reaction of modified rubber seed oil was much higher than that of non-modified rubber seed oil for both methods. The average catalyst selectivity obtained by using H-NMR method of the modified rubber seed oil epoxidation reaction was equal, while of the rubber seed oil epoxidation reaction was 11% lower than that of the titrimetric method. For both types of oils, the difference between the catalytic selectivity obtained by using titration method and by using protons in group α-CH2-(C=O)-O- as the standard peak was the smallest and was the biggest when the protons in group -CH3 was used as the standard peak. Keywords: Selectivity, tungstate-based catalyst, H-NMR. 1. Introduction used to introduce functional groups such as epoxides [1]. Epoxidation occurs when a cyclic ether is formed at sites of ethylenic unsaturation (C=C) located along the fatty acid chains by the addition of an oxygen atom [2]. There are many epoxidation methods such as: epoxidation by conventional method, by using acid ion Vegetable oils are environmentally friendly, biodegradable, relatively low cost, and readily available. The possible use of this resource as a substitute for petrochemical derivatives has attracted the .

TỪ KHÓA LIÊN QUAN
TÀI LIỆU MỚI ĐĂNG
19    228    0    26-04-2024
20    249    2    26-04-2024
8    172    0    26-04-2024
14    170    0    26-04-2024
11    150    1    26-04-2024
165    86    0    26-04-2024
11    110    0    26-04-2024
crossorigin="anonymous">
Đã phát hiện trình chặn quảng cáo AdBlock
Trang web này phụ thuộc vào doanh thu từ số lần hiển thị quảng cáo để tồn tại. Vui lòng tắt trình chặn quảng cáo của bạn hoặc tạm dừng tính năng chặn quảng cáo cho trang web này.