摘要:
The present invention provides a method for producing sucralose from a feed stream including a sucrose-6-acylate in a reaction vehicle. The method includes: (i) reacting the sucrose-6-acylate with a chlorinating agent in order to chlorinate the 4, 1′ and 6′ positions of the sucrose-6-acylate; (ii) quenching the product stream of (i) with an aqueous solution of a base to provide a sucralose-6-acylate and the chloride salt of said base, wherein the concentration of the aqueous solution of the base is sufficiently high such that at least a portion of the chloride salt of the base is formed as a precipitate; (iii) either: deacylating the sucralose-6-acylate by treating the product stream of (ii) with a base and thereafter removing precipitated salt to provide a product stream including sucralose; or: removing precipitated salt from the product stream of (ii) and thereafter deacylating the sucralose-6-acylate by treating with a base to provide a product stream including sucralose; and (iv) isolating sucralose from the product stream of (iii).
摘要:
The present invention provides a method for producing sucralose from a feed stream including a sucrose-6-acylate in a reaction vehicle. The method includes: (i) reacting the sucrose-6-acylate with a chlorinating agent in order to chlorinate the 4, 1′ and 6′ positions of the sucrose-6-acylate; (ii) quenching the product stream of (i) with an aqueous solution of a base to provide a sucralose-6-acylate and the chloride salt of said base, wherein the concentration of the aqueous solution of the base is sufficiently high such that at least a portion of the chloride salt of the base is formed as a precipitate; (iii) either: deacylating the sucralose-6-acylate by treating the product stream of (ii) with a base and thereafter removing precipitated salt to provide a product stream including sucralose; or: removing precipitated salt from the product stream of (ii) and thereafter deacylating the sucralose-6-acylate by treating with a base to provide a product stream including sucralose; and (iv) isolating sucralose from the product stream of (iii).
摘要:
A method of removing a carboxylic acid from a liquid that contains a tertiary amide solvent includes a step of contacting the liquid with an extraction medium comprising an amine. The amine is immiscible with both water and the tertiary amide solvent, and the contacting step forms a de-acidified phase containing the tertiary amide solvent and a phase containing the extraction medium and the carboxylic acid. Both the liquid that contains the tertiary amide solvent and the de-acidified phase may also contain a sucrose-6-acylate.
摘要:
The present invention provides a method for producing sucralose from a feed stream resulting from the chlorination of a sucrose-6-acylate in a reaction vehicle. The feed stream includes a sucralose-6-acylate, the reaction vehicle, water, and salts. The salts include one or more selected from the group consisting of alkali metal chlorides, alkaline earth metal chlorides and ammonium chloride. The method includes: (i) deacylation of the sucralose-6-acylate by treatment with a base to afford a product stream comprising sucralose; (ii) partial removal of water and, optionally, reaction vehicle from the product stream of (i) in order to cause precipitation of the salts from the product stream; (iii) removal of the precipitated salts from the product stream of (ii); and (iv) isolation of sucralose from the product stream of (iii).
摘要:
A method of removing a carboxylic acid from a liquid that contains a tertiary amide solvent includes a step of contacting the liquid with an extraction medium comprising an amine. The amine is immiscible with both water and the tertiary amide solvent, and the contacting step forms a de-acidified phase containing the tertiary amide solvent and a phase containing the extraction medium and the carboxylic acid. Both the liquid that contains the tertiary amide solvent and the de-acidified phase may also contain a sucrose-6-acylate.
摘要:
The present invention provides a method for producing sucralose from a feed stream resulting from the chlorination of a sucrose-6-acylate in a reaction vehicle. The feed stream includes a sucralose-6-acylate, the reaction vehicle, water, and salts. The salts include one or more selected from the group consisting of alkali metal chlorides, alkaline earth metal chlorides and ammonium chloride. The method includes: (i) deacylation of the sucralose-6-acylate by treatment with a base to afford a product stream comprising sucralose; (ii) partial removal of water and, optionally, reaction vehicle from the product stream of (i) in order to cause precipitation of the salts from the product stream; (iii) removal of the precipitated salts from the product stream of (ii); and (iv) isolation of sucralose from the product stream of (iii).
摘要:
A process for the purification of sucralose in sucralose-containing feed streams is disclosed. The process includes multiple liquid-liquid extraction steps; optionally, a concentration step; multiple crystallization steps; optionally, a chromatography step; and various recycle steps.
摘要:
A method of making sucralose includes maintaining a solution of a sucralose-6-acylate in an aqueous solvent at a temperature in a range from −20° C. to 20° C. and at a pH of at least 12.2 and less than 14.0 for a period of time sufficient to deacylate substantially all of the sucralose-6-acylate. The method may employ purified sucralose-6-acylate as the starting material, or the sucralose-6-acylate may be present in a quenched reaction mixture resulting from chlorination of a sucrose-6-acylate. The quenched reaction mixture may be exposed to deacylation conditions either before or after removal of a tertiary amide that may be present in it. Sucralose is subsequently recovered to complete the process.
摘要:
A process for separating, in the liquid phase, a reaction mixture which comprises a first chlorinated sucrose and at least one additional component selected from the group consisting of at least one other chlorinated sucrose different from said first chlorinated sucrose, salt and solvent, by injecting said reaction mixture onto a fixed bed of solid adsorbent and treating with a desorbent such that:(a) the first chlorinated sucrose passes through the adsorbent into a first recoverable product stream rich in said first chlorinated sucrose at a rate, which is different than the rate at which,(b) at least one of said additional components passes through the adsorbent into at least a second recoverable stream rich in said additional component.