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185 results about "Hydroxyethyl sulfonate" patented technology

Sodium 2-hydroxyethyl sulfonate (also: sodium isethionate) is the sodium salt of 2-hydroxyethane sulfonic acid (isethionic acid), it is used as hydrophilic head group in washing-active surfactants, known as isethionates (acyloxyethanesulfonates) due to its strong polarity and resistance to multivalent ions.

Method of preparing taurine

The invention relates to method for preparing taurine, comprising the following steps: (1) reacting epoxy ethane with sodium sulfite under 0.05 to 0.1MPa, with pH value of 6.5 to 7.5 and at temperature between 75 and 85 DEG C to obtain hydroxyethyl sodium sulfonate; (2) carrying out ammonolysis reaction on the hydroxyethyl sodium sulfonate and liquid ammonia under 14 to 21MPa and at temperature between 160 and 280 DEG C to obtain ammonolysis solution containing sodium taurate; (3) introducing the ammonolysis solution into a single flash evaporator for primary flash evaporating at a temperature between 160 and 200 DEG C and under 1.3 to 2.0MPa; introducing the flash evaporated liquid into a secondary flash evaporating and falling film evaporator, using the primary flash vapor as a heating medium to carry out flash evaporating and falling film evaporating on the primary flash evaporated liquid in the secondary flash evaporating and falling film evaporator at a temperature between 110 and 140 DEG C and at 0.1 to 0.6MPa; evaporating and concentrating the flash evaporated liquid subjected to secondary flash evaporating and falling film evaporating with flash vapor and steam as heating media in a multi-effect flash evaporating and falling film evaporator; and (4) neutralizing the sodium taurate by sulphuric acid to obtain the taurine. The method for preparing the taurine has the advantages of short time, high yield and low cost, and is easy for industrialized production. In addition, by primary flash evaporating and secondary flash evaporating processes, almost all the ammonia and 40% to 60% of water in the flash evaporated liquid can be removed, thus having double effects of removing ammonia and condensing.
Owner:王代龙 +1

Method for purifying sodium hydroxyethyl sulphonate

The invention relates to a method for purifying sodium hydroxyethyl sulphonate, which is characterized by comprising the following steps of: preparing 40-45wt% of coarse product prepared by using 30-40wt% of newly-prepared sodium-bisulfite aqueous solution and epoxy ethane as raw materials; delivering the coarse product into a first effect evaporator for concentrating to 5-60wt% at the temperature of 80-120 DEG C; then delivering into a second effect evaporator for further concentrating and evaporating to 72-75wt% at the temperature of 100-130 DEG C; then delivering the concentrated solution to a continuous crystallizer, recrystallizing for 1-6 hours at the temperature of 20-80 DEG C, centrifugalizing crystal mush, delivering solids to next processing step, and respectively recovering a mother solution and a residual crystallization solution; obtaining the sodium hydroxyethyl sulphonate with the purity of larger than 99.5wt% when the content of glycol in the product is smaller than 0.1wt%; returning the recovered mother crystallization solution to the second effect evaporator for concentrating; and extracting the recovered residual crystallization solution with 3 times of anhydrous ethanol, then centrifugalizing, drying crystals at the temperature of 120 DEG C, and recovering and recycling the ethanol which is used as a solvent.
Owner:吉林众鑫化工集团有限公司

Low-pollution lignin dispersant for disperse dye as well as preparation method and application thereof

The invention discloses a low-pollution lignin dispersant for a disperse dye as well as a preparation method and application thereof. The preparation method comprises the following steps: firstly, dissolving an alkali lignin solid in water, adjusting the pH value to be 9.0-12.0 for preparing an alkali lignin aqueous solution with the mass concentration of 20%-50%, heating to 60-90 DEG C, and adding sodium hydroxyethyl sulfonate for reacting for 1-3 hours to obtain a sulfonated hydroxyethyl alkali lignin solution; adding a polarizing agent and a surface active material into the obtained sulfonated hydroxyethyl alkali lignin solution, uniformly stirring and adjusting the pH value to be 4.0-6.0 to obtain the low-pollution lignin dispersant. Compared with sodium lignin sulfonate and sulfomethylated lignin dispersants, the low-pollution lignin dispersant has the characteristics that the pollution rate of fibers and the reduction rate of the disperse dye are remarkably reduced, a dye system prepared from the dye dispersant has the characteristics that the dye-uptake rate of the fibers is greatly increased in comparison with sodium lignin sulfonate, and the dispersion stability of a prepared dye dispersion solution is superior to that of a naphthaline dispersant.
Owner:SOUTH CHINA UNIV OF TECH
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