Supported catalyst and method for synthesizing sucrose-6-ester
Provided are a supported catalyst and a method for synthesizing a sucrose-6-ester. The supported catalyst includes an active functional component and an inorganic carrier, wherein the active functional component is a compound shown in formula (1), wherein n is a natural number greater than or equal to 2; R is an atom linked to a surface of the inorganic carrier; and one or two of R 1 , R 2 , and R 3 is/are hydrocarbyl, and the rest are independently any one selected from the group consisting of oxygen, hydroxyl, hydrocarbyloxy, and acetoxy.
1 . A supported catalyst for catalyzing a transesterification reaction between sucrose and carboxylate, comprising an active functional component and an inorganic carrier, wherein the active functional component is a compound shown in formula (1):
wherein n is a natural number greater than or equal to 2; R is an atom linked to a surface of the inorganic carrier; and one or two of R 1 , R 2 , and R 3 is/are hydrocarbyl, and the rest each are independently any one selected from the group consisting of oxygen, hydroxyl, hydrocarbyloxy, and acetoxy.
2 . The supported catalyst according to claim 1 , wherein R is any one selected from the group consisting of silicon, oxygen, nitrogen, sulfur, and phosphorus.
3 . The supported catalyst according to claim 2 , wherein the active functional component accounts for 1 ppm to 40% of a weight of the inorganic carrier.
4 . The supported catalyst according to claim 1 , wherein hydrocarbyl is selected from the group consisting of alkyl, cycloalkyl, aryl, and aralkyl.
5 . The supported catalyst according to claim 4 , wherein the active functional component accounts for 1 ppm to 40% of a weight of the inorganic carrier.
6 . The supported catalyst according to claim 1 , wherein the hydrocarbyloxy is selected from the group consisting of alkoxy and phenoxy.
7 . The supported catalyst according to claim 6 , wherein the active functional component accounts for 1 ppm to 40% of a weight of the inorganic carrier.
8 . The supported catalyst according to claim 1 , wherein the inorganic carrier is one or a mixture of two or more selected from the group consisting of silicon dioxide, titanium dioxide, activated carbon, and aluminum oxide.
9 . The supported catalyst according to claim 8 , wherein the active functional component accounts for 1 ppm to 40% of a weight of the inorganic carrier.
10 . The supported catalyst according to claim 1 , wherein the inorganic carrier has a specific surface area (SSA) of greater than 10 m 2 /g.
11 . The supported catalyst according to claim 1 , wherein the active functional component accounts for 1 ppm to 40% of a weight of the inorganic carrier.
12 . A method for synthesizing a sucrose-6-ester, comprising: using the supported catalyst according to claim 1 to catalyze a transesterification reaction between sucrose and a low-alcohol carboxylate to obtain the sucrose-6-ester.
13 . The method according to claim 12 , comprising:
sucrose dissolution: heating and dissolving sucrose in a polar aprotic solvent to obtain a sucrose solution;
catalyst addition: adding the supported catalyst according to claim 1 into the sucrose solution to obtain a reaction suspension; and
transesterification reaction: adding a low-alcohol carboxylate to the reaction suspension, and conducting a dehydration and dealcoholization treatment to promote a transesterification reaction to obtain a reaction mixed solution having the sucrose-6-ester as a main product.
14 . The method according to claim 13 , further comprising:
post-treatment: filtering the reaction mixed solution to separate the supported catalyst to obtain a sucrose-6-ester mother liquor.
15 . The method according to claim 13 , wherein the low-alcohol carboxylate is one or more selected from the group consisting of methyl esters, ethyl esters, propyl esters, isopropyl esters, n-butyl esters, isobutyl esters, tert-butyl esters, and phenylmethyl esters of stearic acid, benzoic acid, acetic acid, butyric acid, and lauric acid.
16 . The method according to claim 13 , wherein the polar aprotic solvent is one or more selected from the group consisting of dimethyl sulfoxide (DMSO), acetonitrile, 1,4-dioxane, methyl ethyl ketone (MEK), methyl isobutyl ketone (MIBK), nitromethane, nitroethane, cyclohexanone, N-methylpyrrolidone (NMP), NMP, N,N-dimethylacetamide (DMA), hexamethylphosphoramide (HMPA), and N,N-dimethylformamide (DMF).
17 . The method according to claim 13 , wherein a ratio of a volume of the polar aprotic solvent to a mass of sucrose is in a range of 2-50 mg/L;
based on the active functional component, a molar ratio of the supported catalyst to the sucrose is in a range of 0.01-2; and
a volume of the low-alcohol carboxylate is less than 30% of the volume of the polar aprotic solvent.
18 . The method according to claim 13 , wherein the dehydration and dealcoholization treatment is conducted by distillation of an additional polar aprotic solvent or low-alcohol carboxylate added to the reaction suspension.
19 . The method according to claim 18 , wherein the distillation is conducted at a temperature of 40° C. to 100° C.; the distillation is conducted under a pressure of 0.01 kPa to 100 kPa; and the distillation is conducted for 1 min to 12 h.
20 . The method according to claim 13 , wherein the transesterification reaction is conducted in a kettle-type reactor or a continuous countercurrent reaction distillation tower.