摘要:
Processes comprising: providing a crude gas stream having a temperature not exceeding 40° C., the crude gas stream comprising hydrogen chloride and at least one organic impurity; condensing at least a portion of the at least one organic impurity from the crude gas stream at a temperature not exceeding 0° C. to form a prepurified gas stream and a condensate comprising condensed organic impurity; subjecting at least a portion of the prepurified gas stream to adsorption on an adsorption medium to provide a purified gas stream; and separating the condensate into at least a head gas stream comprising residual hydrogen chloride and a sump stream comprising at least a portion of the condensed organic impurity.
摘要:
The invention relates to a process for production of diaryl carbonate combined with the electrolysis of the resultant alkali metal chloride-containing process wastewater. The process according to the invention makes possible, inter alia, improved utilization in electrolysis of the alkali metal chloride-containing solution obtained in the production of diaryl carbonate.
摘要:
Producing diaryl carbonates comprises producing phosgene by reacting chlorine with carbon monoxide; reacting the phosgene with a monophenol in the presence of a base to form a diaryl carbonate and an alkali metal chloride solution (S1); separating and working up the diaryl carbonate; treating S1 to remove solvent residues, adjusting it to a pH of 8 or less and treating it with an adsorbent; electrochemically oxidizing S1 to form chlorine and alkali liquor; and recycling the chlorine to the phosgene production step and/or recycling the alkali liiquor to the diaryl carbonate production step.
摘要:
PROBLEM TO BE SOLVED: To provide a method for producing carbonyl chloride having very little amount of impurities and good in hue, and the method for producing carbonyl chloride, which suppresses the deterioration of the catalyst and can be operated continuously for a long period.SOLUTION: The method for producing carbonyl chloride includes bringing chlorine and carbon dioxide into contact with a first solid catalyst having a specific surface area of 150 to 350 m/g to react to a reaction ratio of ≥30 mol%, and bringing the resultant into contact with a second solid catalyst having a specific surface area of 900 to 1,500 m/g to carry out the carbonyl chloride reaction.
摘要:
PROBLEM TO BE SOLVED: To provide a method for producing carbonyl chloride considerably reducing superfluous carbon monoxide in production, eliminating the remaining of impurities for the most part and excelling in hue, and to provide polycarbonate resin having little metal corrosive material and excelling in hue and molding thermal stability.SOLUTION: The method for continuously producing carbonyl chloride includes supplying chlorine (A mols) and carbon monoxide (B mols) continuously into a reaction system having a catalyst, and circulating a part (C mols) of the produced carbonyl chloride to supply it into the reaction system. The temperature of circulating gas is within a range of 40-150°C, and the following expressions (1), (2) are satisfied: (1) A:B=1.000:1.005-1.100 (molar ratio) and (2) A:C=1.00:0.05-3.00 (molar ratio).
摘要:
PROBLEM TO BE SOLVED: To provide a method for producing phosgene where the increase of pressure drop and the deterioration of a solid catalyst caused by clogging of the chloride of nickel (a solid compound) produced by reacting a nickel compound in carbon monoxide produced by using coke with chlorine when producing phosgene on the surface layer and in the space of the solid catalyst are suppressed, where the renewal frequency of the solid catalyst is reduced, which has an advantageous cost and which has excellent production efficiency, and to provide a method for producing the carbon monoxide used as the raw material of phosgene.SOLUTION: In a method for producing high purity carbon monoxide by purifying the carbon monoxide produced by oxidizing the coke by the aeration of an oxygen-containing gas to the coke, it is characterized in that the obtained carbon monoxide is in contact with an aqueous alkali solution after being in contact with chlorine and then the carbon monoxide is in contact with an adsorbing agent.
摘要:
PROBLEM TO BE SOLVED: To provide a method and apparatus for producing carbonyl chloride in which a supply amount of chlorine is kept equal to or less than a supply amount of carbon monoxide in terms of molar ratio so that a polyisocyanate can be prevented from being chlorinated, and to provide a method and apparatus for producing a polyisocyanate. SOLUTION: In a carbonyl chloride production control section 7, a supply amount of carbon monoxide gas is first set, a carbon monoxide control valve 9 is controlled so that carbon monoxide gas is continuously supplied to a reaction section 6 by the set supply amount, and a supply amount of carbon monoxide gas detected by a carbon monoxide flowmeter 10 is always monitored. On the basis of the always monitored supply amount of carbon monoxide gas, a supply amount of chlorine is always set so as to achieve a supply amount in a predetermined ratio corresponding to a certain molar ratio in which carbon monoxide becomes excess over chlorine, and a chlorine control valve 12 is controlled so that chlorine gas is supplied to the reaction section 6 by the always set supply amount. COPYRIGHT: (C)2010,JPO&INPIT
摘要:
PROBLEM TO BE SOLVED: To provide a process for producing a product containing an isocyanate with a remarkably reduced hydrolyzable chlorine content and total chlorine content without requiring a further purification step. SOLUTION: The process comprises a step of providing an amine reactant and a step of reacting the amine reactant with a stream of phosgene in a reaction zone to form a product containing the corresponding isocyanate, the stream of phosgene having an average CO content of 0.5 wt.% or more. COPYRIGHT: (C)2009,JPO&INPIT