Abstract:
PROBLEM TO BE SOLVED: To provide a method for producing dichlorobutene which comprises obtaining a reaction liquid having high concentration in a high yield and requiring less energy for solvent separation in a later process. SOLUTION: This method for producing a mixture of 3,4-dichloro-1-butene and 1,4-dichloro-2-butene continuously by reacting 1,3-butadiene with chlorine in a solvent and in the presence of a catalyst is characterized by using a reaction liquid-circulating reaction device, having a butadiene-mixing and dissolving zone, chlorination reaction zone, heat-removing zone, drawing out zone and circulating pump, feeding the solvent selected from a saturated hydrocarbons and trichloroethylene, the raw materials and catalyst into the circulating reaction liquid, uniformly dissolving, then feeding the chlorine to react at 20 to 70°C temperature under a condition stipulated by the following formula 1, and then drawing out the reaction liquid and produced hydrogen chloride gas as a byproduct in the drawing out zone. [The concentration of the 1,3-butadiene in the reaction liquid (mol/L)]÷[the feeding rate of the chlorine (mol/hr)/the flow rate of circulation (L/hr)] (1). COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PURPOSE:To provide a production process of N-alkylaminoethanesulfonic acid sodium salt capable of remarkably suppressing production of by-products, substantially requiring no purification process, thus having an extremely excellent economical efficiency. CONSTITUTION:An aqueous solution of sodium hydrogensulfite controlled to pH>=4.4 is reacted with ethylene oxide at
Abstract:
PURPOSE:To provide a method for producing a sodium N- alkylaminoethanesulfonate low in the contents of impurities and excellent in qualities. CONSTITUTION:When a sodium N-alkylaminoethanesulfonate is produced by reacting sodium isetionate with an alkylamine, the sodium isetionate having a sulfide component content of
Abstract:
PURPOSE:To provide a production process of N-alkylaminoethanesulfonic acid sodium salt capable of remarkably suppressing production of by-products and substantially requiring no purification process, thees having an extremely excellent economical efficiency. CONSTITUTION:An aqueous solution of sodium hydrogensulfite controlled to pH>=4.4 is reacted with ethylene oxide at
Abstract:
PURPOSE:To produce a sodium N-alkylaminoethanesulfonate by efficiently removing the extremely easily filterable crystals of sodium sulfate from an aqueous solution mainly containing the sodium N-alkylaminoethanesulfonate and the sodium sulfate. CONSTITUTION:A method for producing a sodium N-alkylaminoethanesulfonate is characterized by continuously crystallizing sodium sulfate within a condition range represented by the inequality relating to the concentration of the sodium N-alkylaminoethanesulfonate and the temperature of the slurry in a concentration and crystallization tank, when the sodium sulfate is crystallized and removed from an aqueous solution containing the sodium N- alkylaminoethanesulfonate and the sodium sulfate.
Abstract:
PROBLEM TO BE SOLVED: To provide a method providing a reaction liquid of a high concentration of dichlorobutenes which uses an apparatus made of a general-purpose metal material, gives dichlorobutenes in a high yield and requires less energy for solvent separation in a post process, a method of producing 3,4-dichloro-1-butene, serving as a raw material for chloroprene monomer, with higher selectivity, and a particulate anion exchange resin used in these methods. SOLUTION: The particulate anion exchange resin serves as a catalyst for a method of producing dichlorobutenes by reacting 1,3-butadiene with chlorine at 20-70°C in a solvent to produce 3,4-dichloro-1-butene and 1,4-dichloro-2-butene and has an average particle size of 0.5-10 μm. The method of producing the resin and the method of producing dichlorobutenes by using the resin are also provided. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a process for producing a reaction solution having a high dichlorobutene concentration with an apparatus formed of a general-purpose metal to achieve the production of dichlorobutene at a high yield and reduce energy required for solvent separation in a post-process, and to provide a process for producing 3, 4-dichloro-1-butene as a starting material for chloroprene monomer with higher selectivity. SOLUTION: The process for producing dichlorobutene includes reacting 1, 3-butadiene with chlorine in the presence of a catalyst containing an anion exchange resin and having a small particle diameter of ≤50 μm in terms of average particle diameter in a solvent at a reaction temperature of 20-70°C to produce 3, 4-dichloro-1-butene and 1, 4-dichloro-2-butene. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a method for removing organic matter in phosphoric acid efficiently and effectively by decomposing the organic matter and make waste gas treatment easily by two-step decomposition, the first step using a chlorate and the second step using a hypochlorite. SOLUTION: This removal of organic matter in phosphoric acid which preferably contains 30-60wt.% of P2 O5 comprises adding a chlorate, preferably sodium chlorate, to phosphoric acid that contains organic matter at 100 deg.C or higher temperature in the first step, and then adding a hypochlorite, preferably sodium or calcium hypochlorite, in such a quantity that the content of chloride ions in the obtained phosphoric acid solution is 0.35 or less ratio by weight to the content of the hypochlorite ions. The gas generated in these steps is substantially chlorine gas, antipollution treatment of which can be easily made by its contact with alkali.
Abstract:
PROBLEM TO BE SOLVED: To provide a method, solving problems characteristic to conventional techniques, having excellent removing efficiency on organic materials and capable of decomposing and removing them in an effective and efficient manner. SOLUTION: This method for decomposing and removing organic materials in a phosphoric acid solution consists of the addition of a hypochlorite in a weight ratio of =15wt.%.