Process for producing fatty acid esters and fuels comprising fatty acid esters
A fatty acid ester and fuel technology, which is applied in the production of fatty acid ester and fuel containing fatty acid ester, and can solve the problem of oil loss
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Embodiment 1
[0030] This example illustrates the esterification and transesterification reactions using:
[0031] Soybean oil enriched with 7% oleic acid (acid value: 14.86, water content: 0.07%);
[0032] Methanol (anhydrous, water content is less than 0.05%) for reaction;
[0033] Catalyst: Tetraalkyl titanate mixture TYZOR TPT-20B (composition of 80% tetraisopropyl titanate and 20% tetra-n-butyl titanate).
[0034] Equipped with an improved column injector (column injector), flame ionization detector and Rtx-1 (RESTEK) capillary column (15m, 0.32mm ID, coated with 0.10μm of 100% dimethyl polysiloxane membrane ) on a Perkin Elmer 8700 gas chromatograph for gas chromatographic analysis of the product.
[0035] Process:
[0036] First step: no catalyst (repeated experiments based on the article by M. Diasakou et al.)
[0037] Add about 220 g (0.25 mol) of soybean oil rich in 7% oleic acid to a reactor (as shown in the accompanying drawing) with a volume of 600 ml. After a few minutes,...
Embodiment 2
[0039] The first step: there is a catalyst
[0040] About 220 g (0.25 mol) of rapeseed oil rich in 7% oleic acid and 0.24 g (1000 ppm) of catalyst TIZOR TPT-20B were added to a reaction kettle with a volume of 600 ml and mixed. After several minutes, 180 g (5.63 mol) of anhydrous methanol was added, the reactor was closed, and heated for 45 minutes while stirring until the reaction temperature reached 230°C. Heating was continued at the same temperature for 30 minutes. The pressure in the autoclave was 45.5 bar at the beginning of the reaction and decreased to 40 bar at the end of the reaction. After 30 minutes, the heating was turned off and the autoclave was cooled to 50-60°C. The reaction mixture was transferred to a 1 L round bottom flask and the methanol was evaporated over 40 minutes by means of a rotary evaporator (bath temperature 85° C., pressure 40 mbar). After standing in the separating funnel for 30-40 minutes, about 90% of the theoretical amount of glycerol was...
Embodiment 3
[0042] In the same manner, esterification and transesterification were performed using virgin palm oil containing 25% free fatty acids. In this test, the molar ratio of methanol to oil was changed to 50:1. The obtained results are shown in Table 1. Notably, esterification and transesterification can be performed in a single step with greater than 90% yield.
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