Abstract: Disclosed is a method for purifying sucralose, including: removing a solvent from a sucralose reaction solution to obtain a concentrated crude sucralose solution; under stirring, adding ethyl acetate into the concentrated crude sucralose solution, heating to a preset temperature, and holding at the preset temperature for a first preset time to obtain a crude product slurry with a certain amount of a sucralose crystal; and subjecting the crude product slurry to gradient cooling to an endpoint temperature, holding at the endpoint temperature for a second preset time, and filtering to obtain a sucralose crystal.

Abstract: Disclosed are a device and a method for preparing a sucrose-6-ester. The device includes a tank body, a heating pipe, an annular cooling apparatus, and a motor, wherein the annular cooling device and the heating pipe are arranged in the tank body in nested manner; the annular cooling apparatus includes a condensation inner wall, a condenser pipe, and a condensation outer wall that are arranged in nested manner; a distillation chamber is formed between the heating pipe and the tank body, a condensation chamber is formed between the heating pipe and the condensation outer wall, and a hollow portion of the condensation inner wall forms a reaction chamber; the heating pipe and the condensation inner wall are drove by the motor to rotate; the heating pipe is provided with a vapor outlet; an evaporation residue channel is formed at an end of the heating pipe away from the feed inlet.

Abstract: Provided is a method for preparing a sucrose-6-ester, including: preparing a reaction solution of sucrose and an organo-tin compound; atomizing the reaction solution to form droplets; thoroughly mixing and contacting the droplets with a gasified dehydration medium such that the droplets undergo a dehydration reaction to obtain an intermediate mixture containing sucrose organic tin ester droplets; separating the intermediate mixture to obtain a sucrose organic tin ester solution and a dehydrated gas-liquid mixture; recovering the sucrose organic tin ester solution obtained in the separation step and cycling to the atomization and dehydration steps several times; and subjecting an organic acid anhydride to an acylation reaction with the sucrose organic tin ester solution to obtain the sucrose-6-ester.

Abstract: Provided is a post-treatment method for a sucrose-6-carboxylate chlorination reaction solution, including: adding ammonia water or water to the sucrose-6-carboxylate chlorination reaction solution to obtain a mixture, and subjecting the mixture to preliminary neutralization reaction; introducing an ammonia gas into a resulting reaction solution at a predetermined temperature, adjusting a pH of the resulting reaction solution to a predetermined alkalinity range, and conducting a reaction at a reaction temperature for a period of time; and adjusting a pH of a reaction solution obtained after the ammonia gas neutralization using an acid to a predetermined acidity range.

Abstract: Provided are a device and a method for producing a sucrose-6-ester. The device includes a shell, a film scraping apparatus, and a base, wherein the film scraping apparatus is arranged on the base, and the shell covers the film scraping apparatus and the base; the shell is provided with a reaction solution inlet and a condensated water outlet; the base is provided with a carboxylate feed pipe, a reaction product discharge pipe, and a reaction channel connected to the carboxylate feed pipe; the film scraping apparatus includes a temperature control unit, a rotary tube, and a plurality of scrapers arranged on an inner wall of the rotary tube, and an outer edge of each of the scrapers abuts against an outer wall of the temperature control unit; and the rotary tube is able to rotate around the temperature control unit.