- Preparation method of ethylene sulfate
-
The invention provides a preparation method of ethylene sulfate, which comprises the following specific steps: 1) adding ethylene glycol disodium into a solvent, dropwise adding sulfonyl chloride at a certain temperature under the protection of nitrogen, reacting for a period of time, filtering, washing, and drying the solid to obtain sodium chloride; 2) combining the filtrate and the washing solution, washing to be neutral by using a sodium bicarbonate aqueous solution, and separating out an organic phase; and 3) drying the organic phase with anhydrous sodium sulfate, recovering the solvent under reduced pressure, recrystallizing the residue, and drying in vacuum to obtain ethylene sulfate. According to the invention, ethylene glycol disodium salt is used as a raw material and reacts with sulfonyl chloride in a solvent to synthesize ethylene sulfate. According to the method, the raw materials are easy to obtain, an expensive catalyst is not used, and the production cost is greatly reduced, so that the discharge of acid-containing wastewater and byproducts is fundamentally eliminated. The requirement of clean production is met; Meanwhile, the production cost is reduced, and great economic benefits and social benefits are achieved.
- -
-
Paragraph 0026-0029
(2021/09/29)
-
- VINYL SULFONIC ACID AQUEOUS SOLUTION AND METHOD OF PRODUCING THE SAME, AND VINYL SULFONIC ACID PURIFIED PRODUCT AND METHOD OF PRODUCING THE SAME
-
PROBLEM TO BE SOLVED: To provide a vinyl sulfonic acid aqueous solution that can shorten the heat operation time in a dewatering step and suppress the occurrence of a viscous product and a method of producing the same, and a vinyl sulfonic acid purified product having excellent storage stability and a method of producing the same. SOLUTION: A vinyl sulfonic acid aqueous solution comprises 7-35 mass% of a sulfonic acid having a vinyl group, and 0. 0030-2.0 mass% of an ether compound having a sulfonic acid group. COPYRIGHT: (C)2015,JPOandINPIT
- -
-
Paragraph 0090; 0101; 0124
(2017/07/23)
-
- DENTAL ADHESIVE COMPOSITION
-
[Problems] To provide a liquid dental adhesive composition which contains a phosphoric acid-type compound having a hydrogenphosphoric diester group as an acidic group-containing polymerizable monomer and, further, contains polyvalent metal ions, effectively preventing not only the gelation but also the formation of precipitates (cloudiness) during the storage. [Means for Solution] A dental adhesive composition which is acidic and contains an acidic group-containing polymerizable monomer (A), polyvalent metal ions (B), water (C), a water-soluble organic solvent (D) and fluoride ions (E), wherein at least 35% by mole of the acidic group-containing polymerizable monomer (A) is a phosphoric acid-type compound having a hydrogenphosphoric diester group, and the contents of the fluoride ions (E) and the polyvalent metal ions (B) are so set that a valence number ratio (RF) defined by the following formula (1): [in-line-formulae]RF=VF/TVP??(1)[/in-line-formulae]wherein VF is a valence number of the fluoride ions (E) contained in the composition, and TVP is a total valence number of the polyvalent metal ions (B) contained in the composition, satisfies a range of 0.2 to 2.0.
- -
-
-
- VINYLSULFONIC ACID, POLYMER OF THE SAME, AND METHOD FOR PRODUCING THE SAME
-
(1) A vinyl sulfonic acid, having a double bond content of 95 wt.% or more, and (i) a sodium (Na) content of 1 ppm or less, and (ii) a content of at least one metal selected from the group consisting of alkali earth metal and first row transition metal of 1 ppm or less. Alternatively, (2) a vinyl sulfonic acid, having a double bond content of 95 wt.% or more, and (i) a sodium (Na) content of 100 ppb or less, and (ii) a content of at least one metal selected from the group consisting of alkali earth metal and first row transition metal of 100 ppb or less. Further, a homopolymer or copolymer thereof, a production method thereof, or a thin-film distillation apparatus suited for the production thereof.
- -
-
Page/Page column 20
(2011/01/12)
-
- PROCESS FOR PRODUCING VINYLSULFONIC ACID
-
The subject invention provides: a method for producing vinyl sulfonic acid, comprising conducting demetallation of vinyl sulfonate salt, wherein the demetallation rate is not less than 95% according to the following formula: D?e?m?e?t?a?l?l?a?t?i?o?nr?a?t?e%=a?c?i?dv?a?l?u?ea?f?t?e?rd?e?m?e?t?a?l?l?a?t?i?o?n/a?c?i?dv?a?l?u?eb?e?f?o?r?ed?e?m?e?t?a?l?l?a?t?i?o?n×100; a method for producing vinyl sulfonic acid, comprising conducting demetallation of vinyl sulfonate salt, wherein demetallation is carried out using a strongly acidic ion exchange resin; and said method further comprising the step of purifying a product of the demetallation using a thin film evaporator.
- -
-
Page/Page column 7
(2009/12/23)
-
