Process for synthesizing sucrose polyester by using rotating film transesterification flow reactor

Abstract

The invention discloses a process for synthesizing sucrose polyester, particularly a process for synthesizing sucrose polyester by using a rotating film transesterification flow reactor. The process comprises the following steps: methyl oleate, sucrose powder, potassium stearate and potassium carbonate are added into a mixing kettle, and heated while stirring; the materials enter the rotating film transesterification flow reactor to react; the crude fatty acid sucrose polyester product obtained after the reaction enters a product storage tank, and the reaction product methanol enters a methanol receiver after being cooled by a condenser; and the crude product in the product storage tank is neutralized with acetic acid, washed and dried to obtain the sucrose polyester product. The low-boiling-point substances generated in the process provided by the invention are quickly removed out of the reaction system, thereby being beneficial to the generation of the product, greatly increasing the reaction speed and enhancing the product quality. The process can be used for continuous-feeding production, is beneficial to large-scale production, enhances the production efficiency, has the advantages of high yield and simple process, lowers the production cost and raises the resource utilization ratio.

Description

technical field [0001] The invention relates to a process for synthesizing sucrose polyester, in particular to a process for synthesizing sucrose polyester by using a rotating film transesterification continuous reactor. Background technique [0002] In organic chemical synthesis, transesterification is a reaction in which an ester and an alcohol are catalyzed by an acid or a base to form a new ester and a new alcohol, that is, the alcoholysis reaction of an ester. This reaction is reversible, and there is a reaction equilibrium. In order to make the reaction proceed in the desired direction, the product needs to be taken away from the reaction system. For example: the ester or alcohol with a lower boiling point can be distilled out by distillation. Under certain conditions, esters and acids can also undergo transesterification reactions to generate a new ester and a new acid. It is also necessary to distill out the generated ester or acid with a lower boiling point. [00...

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Problems solved by technology

[0003] The existing process of synthesizing sucrose polyester is a method of distilling the product out of the reaction system. It is carried out in a reactor equipped with a distillation device. This method belongs to intermittent production, the production cycle is long, and the conversion rate of raw materials is not ideal. , is not conducive to large-scale production, affecting production efficiency and quality

Moreover, the existing synthetic sucrose polyester process has low yield, difficult separation and recycling of the raffinate in the extraction process, complicated process, high production cost, and low resource utilization rate.

[0004] The invention patent (application (patent) number: CN03101111.X) of the "New Process for Synthesizing High Esterification Degree of Sucrose Fatty Acid Polyester" issued by the Xinjiang Institute of Physics and Chemistry, Chinese Academy of Sciences, relates to the synthesis of a high degree of esterification sugar and fatty acid polyester A new process, which uses fatty acid methyl ester or fatty acid ethyl ester as raw material, and adopts thin film evaporator or molecular still to recycle multiple distillations to improve the efficiency of the esterification reaction and the degree of esterification of the product sucrose fatty acid polyester. Although the method makes up for the low conversion rate of raw materials in conventional batch production, the raw material is circulated at high temperature for a long time, and the crude sucrose polyester is easy to be colored. During the purification process, hydrogen peroxide and other methods are required to decolorize, resulting in a high peroxide value of the product , the application in some fields such as food machinery lubrication and health care products is limited; the process is still batch production, and the production efficiency is not high in large-scale production

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