The present invention relates to a method for the chlorination of a sucrose-6-acylate to produce a 4,1,6-trichloro-4,1,6-trideoxy-galactosucrose-6-acylate wherein said method includes steps of: (i) combining the sucrose-6-acylate with a chlorinating agent in a reaction vehicle comprising a tertiary amide to afford a mixture; (ii) heating said mixture for a heating period in order to provide chlorination of sucrose-6-acylate at the 4, 1 and 6 positions thereof; and (iii) quenching the product stream of (ii) to produce a 4,1,6-trichloro-4,1,6-trideoxy-galactosucrose-6-acylate;
wherein before said quenching, a portion of said tertiary amide is removed by extraction into a solvent in which said tertiary amide is at least partially soluble.

The present invention relates to a method for the chlorination of a sucrose-6-acylate to produce a 4,1,6-trichloro-4,1,6-trideoxy-galactosucrose-6-acylate wherein said method includes steps of: (i) combining the sucrose-6-acylate with a chlorinating agent in a reaction vehicle comprising a tertiary amide to afford a mixture; (ii) heating said mixture for a heating period in order to provide chlorination of sucrose-6-acylate at the 4, 1 and 6 positions thereof; and (iii) quenching the product stream of (ii) to produce a 4,1,6-trichloro-4,1,6-trideoxy-galactosucrose-6-acylate;
wherein before said quenching, a portion of said tertiary amide is removed by extraction into a solvent in which said tertiary amide is at least partially soluble.

The present invention relates to a method of recovering (meth)acrylic acid and an apparatus used for the recovery method. The recovery method according to the present invention discharges each (meth)acrylic acid aqueous solution of different concentrations at a (meth)acrylic acid absorption tower, and uses an extraction solvent of a specific ratio in the step of extracting (meth)acrylic acid, thus enabling the operation of a continuous process of recovering (meth)acrylic acid that can secure a high (meth)acrylic acid recovery rate, and can simultaneously significantly reduce purification energy cost.

Disclosed are an apparatus and a method for supplying a pulse to solvent extraction column (hereinafter, pulsed column). More particularly, the present invention relates to a low cost apparatus with a simple method for stably supplying a pulse to a pulsed column, which is employed as unit equipment in a solvent extraction process. The apparatus for supplying a pulse to the pulsed column having a first solvent inlet and a second solvent outlet at the low part of the pulsed column, and a second solvent inlet and a first solvent outlet at the top part of the pulsed column thereof, includes: a diaphragm pump actuated by using electric power or compressed air, and having a discharge part and a suction part, in which one of the discharge part and the suction part is blinded while the remaining one thereof is connected to the pulsed column via a pulse supply line.

The present invention relates to a method of recovering (meth)acrylic acid and an apparatus used for the recovery method. The recovery method according to the present invention discharges each (meth)acrylic acid aqueous solution of different concentrations at a (meth)acrylic acid absorption tower, and uses an extraction solvent of a specific ratio in the step of extracting (meth)acrylic acid, thus enabling the operation of a continuous process of recovering (meth)acrylic acid that can secure a high (meth)acrylic acid recovery rate, and can simultaneously significantly reduce purification energy cost.

Disclosed are an apparatus and a method for supplying a pulse to solvent extraction column (hereinafter, pulsed column). More particularly, the present invention relates to a low cost apparatus with a simple method for stably supplying a pulse to a pulsed column, which is employed as unit equipment in a solvent extraction process. The apparatus for supplying a pulse to the pulsed column having a first solvent inlet and a second solvent outlet at the low part of the pulsed column, and a second solvent inlet and a first solvent outlet at the top part of the pulsed column thereof, includes: a diaphragm pump actuated by using electric power or compressed air, and having a discharge part and a suction part, in which one of the discharge part and the suction part is blinded while the remaining one thereof is connected to the pulsed column via a pulse supply line.

The present invention relates to a process for the selective extraction of a salt to be extracted from a brine to be treated containing the said salt to be extracted, characterized in that: the brine to be treated (S1) is sent to an initial extraction stirrer-mixer (1a) into which a liquid hydrophobic organic phase is also introduced, the said brine and the said liquid hydrophobic organic phase are mixed in the said initial extraction stirrer-mixer (1a), and the mixture is sent to an initial decanter-separator (1d, 1dc), in order to obtain: a brine from which salt to be extracted has been removed; and an organic phase loaded with salt to be extracted; the brine from which the salt to be extracted has been removed is recovered; the organic phase loaded with salt to be extracted is sent to an initial washing stirrer-mixer-decanter-centrifugal separator (5a, 5dc or 7a, 7dc), in order to obtain a purified organic phase loaded with salt to be extracted, which is sent to a so-called organic heat exchanger (1e) in which it is heated before being sent to a so-called initial regeneration column (1c; 2c), in which a countercurrent exchange is carried out with hot water at a higher temperature than that of the initial brine, in order to obtain: a water containing the salt to be extracted; and a regenerated organic phase, having lost the salt to be extracted; the regenerated organic phase is recycled to the initial extraction stirrer-mixer (1a).