44results about "Phosgene" patented technology

The objective of the present invention is to provide a method for producing a halogenated carbonyl safely and efficiently. The method for producing a halogenated carbonyl according to the present invention is characterized in comprising the step of applying ultrasound to a composition containing a C1-4 halogenated hydrocarbon having one or more halogeno groups selected from the group consisting of chloro, bromo and iodo in the presence of oxygen to decompose the C1-4 halogenated hydrocarbon.

The invention relates to the technical field of chemical recovery, and particularly discloses a carbon tetrachloride removal system and process, the system comprises a washing tower and a carbon tetrachloride removal assembly, the washing tower is used for introducing a solvent and a phosgene material; the tower top of the washing tower is used for outputting treated substances; a tower kettle of the washing tower is communicated with the carbon tetrachloride removal assembly, and the carbon tetrachloride removal assembly is used for removing carbon tetrachloride in materials from the washing tower. The solvent is introduced into the washing tower to wash the phosgene material, and after the solvent is introduced, the washing tower is not pure phosgene equipment, so that the safety performance is improved; and compared with the prior art that carbon tetrachloride is removed by utilizing a phosgene rectifying tower and a solvent refining tower, the combination of the washing tower and the carbon tetrachloride removal assembly is beneficial to reducing the energy consumption.

The objective of the present invention is to provide a method for producing a carbonyl halide safely and efficiently. The method for producing a carbonyl halide according to the present invention is characterized in comprising the step of irradiating a light to a halomethane having 1 or more halogeno groups selected from the group consisting of chloro, bromo and iodo in the presence of oxygen and ozone.

The invention discloses a triphosgene continuous synthesis method and device, and belongs to the technical field of fine chemical production. The triphosgene continuous synthesis method comprises the following steps: S1, continuously conveying dimethyl carbonate to the lower part of a reactor, and continuously inputting chlorine from the bottom of the reactor; s2, after dimethyl carbonate and chlorine are mixed in a reactor, a reaction is initiated by irradiation of an ultraviolet light source with the wavelength of 295-395 nm, and molten triphosgene and hydrogen chloride gas are generated; wherein the temperature in the reactor is gradually increased from bottom to top to present a temperature gradient; and S3, continuously overflowing the molten-state triphosgene into a degassing tower to remove residual hydrogen chloride in vacuum, and enabling the degassed molten-state triphosgene product to enter a flaking section. According to the method, by optimizing reaction conditions and equipment design, the cost can be reduced, the utilization rate of raw materials can be increased, generation of byproducts can be reduced, meanwhile, the safety and efficiency of the reaction are guaranteed, and efficient, safe and continuous production of triphosgene is achieved.

The objective of the present invention is to provide a method for producing a carbonyl halide safely and efficiently. The method for producing a carbonyl halide according to the present invention is characterized in comprising the step of irradiating a light to a halomethane having 1 or more halogeno groups selected from the group consisting of chloro, bromo and iodo in the presence of oxygen and ozone.

The invention relates to a process for producing phosgene by gas-phase reaction of carbon monoxide and chlorine in the presence of a catalyst in a reactor which comprises a plurality of parallel catalyst tubes which are filled with the catalyst and around which at least one fluid heat transfer medium flows, where a feed stream of a mixture of a chlorine input stream and a carbon monoxide input stream is fed into the catalyst tubes and is allowed to react to give a phosgene-comprising product gas mixture, wherein the reaction is carried out at an area load of more than 2.75 kg of phosgene / m2s. The invention also provides a reactor for carrying out the process.

The present invention relates to a process for producing isocyanates and, optionally, polyurethanes, by at least synthesizing (1) phosgene (20) from carbon monoxide (21) and chlorine (22); reacting (2) phosgene (20) with a diamine (23) to produce a diisocyanate (24) and hydrogen chloride (25); providing a carbon dioxide gas stream (31); and cleaning (4) the carbon dioxide gas stream (31) with additional components, wherein the carbon dioxide is converted by a RWGS reaction (6) to produce carbon monoxide (21) and hydrogen (29), which are used as raw materials for polyurethane production, and optionally reacting (3) the diisocyanate (24) with a polyether polyol (35a) and / or polyester polyol (35b) to produce polyurethane (37).

The present invention aims to provide a method for producing a carbonyl halide safely, at low cost, and with a low environmental impact. The method for producing a carbonyl halide according to the present invention is characterized by comprising a step of irradiating a mixed gas containing methane, a halogen elemental gas, and oxygen with light.

The purpose of the present invention is to provide a method for producing a nucleophilic reaction product, the method being capable of using a halogenated carbonyl compound for the reaction without requiring isolation thereof, while being able to be carried out under mild reaction conditions.　In order to achieve the above-described purpose, a method for producing a nucleophilic reaction product according to the present invention is characterized by comprising: a halogenated carbonyl compound generation step in which a halogenated carbonyl compound is generated by having a halogen oxide radical and a halogenated hydrocarbon react with each other; and a nucleophilic reaction product production step in which the halogenated carbonyl compound is reacted with a nucleophilic agent without being isolated, thereby producing a nucleophilic reaction product of the halogenated carbonyl compound and the nucleophilic agent.

The invention relates to a phosgene purification method and a method for preparing chloroformic acid-2-ethyl ethyl. According to the method, the MOF material with excellent performance is prepared, and the MOF material is adopted to purify the phosgene, so that trace chlorine in the phosgene can be effectively removed, it is ensured that the chlorine is hardly contained in the phosgene, and adverse effects on downstream preparation of chloroformic acid-2-ethylhexyl ester are avoided. The invention also provides a method for preparing chloroformic acid-2-ethylhexyl ester, which comprises the step of reacting phosgene with isooctanol, and the phosgene is purified by the phosgene purification method. The method provided by the invention can reduce side reactions during preparation of chloroformic acid-2-ethyl ethyl, improve product purity and ensure product chromaticity.

A unit for producing and processing phosgene, said unit being configured for at least one maintenance mode and at least one production mode and comprising a structure which defines a confined space in a production mode, said confined space being sub-divided into at least two sub-spaces, wherein (i) at least one sub-space contains at least one apparatus for producing phosgene; (ii) at least one sub-space, other than the at least one sub-space according to (i), contains at least one apparatus for processing phosgene; (iii) the structure comprises at least one openable and lockable access means for temporary access of at least one of the apparatuses according to (i) or (ii) from outside the structure in a maintenance mode.

Provided is a method for efficiently producing a carbonyl halide from a halogenated methane. The method for producing a carbonyl halide according to the present invention is characterized by comprising the steps of: a step of preparing a mixed gas containing a halogenated methane and oxygen, the halogenated methane having one or more halogen groups selected from the group consisting of chlorine, bromine, and iodine; and a step of flowing the mixed gas and irradiating the flowing mixed gas with high-energy light.

The utility model provides a phosgene synthesis device. The phosgene synthesis device comprises a carbon monoxide generation unit, a chlorine generation unit and a synthesis unit, the carbon monoxide generation unit comprises a carbon monoxide generation furnace, a dust removal and cooling device, an alkali washing desulfurization device, a gas holder, a carbon monoxide post-treatment device, an oxygen supply system for providing oxygen for the carbon monoxide generation furnace, an automatic coke adding device for providing coke for the carbon monoxide generation furnace, and a water supply system for providing water for the dust removal and cooling device which are connected in sequence; the alkali preparation system is used for providing alkali liquor for the alkali washing desulfurization device; the synthesis unit comprises a mixing tee joint, a phosgene synthesizer and a cleaning reactor which are connected in sequence; and two gas inlet ends of the mixing tee joint are respectively connected with a carbon monoxide gas outlet end of the carbon monoxide post-treatment device and a chlorine gas outlet end of the chlorine gas generation unit. According to the phosgene synthesis device disclosed by the utility model, each working section is reasonable in structural design and strong in continuity, the manual participation degree is effectively reduced, the labor intensity and the operation risk are reduced, and the production efficiency is improved.

The present invention relates to a method of preparing hexamethylene diisocyanate according to claim 1, and of preparing polyurethane from hexamethylene diisocyanate, wherein methanol is used in the method in question as a raw material for the build-up of the hexamethylene moiety of the hexamethylene diisocyanate.

The objective of the present invention is to provide a method for producing a carbonyl halide safely at a low cost and a low environmental load. The method for producing a carbonyl halide according to the present invention is characterized in comprising the step of irradiating a light to a mixed gas comprising methane, a halogen molecule gas and oxygen.

The objective of the present invention is to provide a method for producing a carbonyl halide efficiently to the used halogenated methane. The method for producing a carbonyl halide according to the present invention is characterized in comprising the steps of preparing a mixed gas comprising oxygen and a halogenated methane having one or more halogeno groups selected from the group consisting of chloro, bromo and iodo, and flowing the mixed gas and irradiating a high energy light to the flowed mixed gas.

A unit for producing and processing phosgene, said unit being configured for at least one maintenance mode and at least one production mode and comprising a structure which defines a confined space in a production mode, said confined space being sub-divided into at least two sub-spaces, wherein (i) at least one sub-space contains at least one apparatus for producing phosgene; (ii) at least one sub-space, other than the at least one sub-space according to (i), contains at least one apparatus for processing phosgene; (iii) the structure comprises at least one openable and lockable access means for temporary access of at least one of the apparatuses according to (i) or (ii) from outside the structure in a maintenance mode.

The invention relates to a method for producing phosgene by reacting chloride and CO on an active carbon catalyst, characterized in that the active carbon catalyst is dried by reduction of the water content, the drying comprising the following steps: a) bringing the catalyst into contact with an inert gas stream, b) determining the residual humidity of the catalyst by determining the humidity in the exhaust gas stream, c) completing the drying process after reaching the desired humidity in the exhaust gas stream by changing from the inert gas to the reaction gases, and optionally d) heating the catalyst bed and / or the inert gas during the drying process.

The present invention relates to a process for preparing phosgene by reacting chlorine with carbon monoxide over an activated carbon catalyst, wherein the content of chlorine oxides in the chlorine feed stream is low, to an apparatus for preparation of phosgene and to the use of the phosgene prepared by the process of the invention.

Provided are an activated carbon catalyst for phosgene synthesis and a method using same. By controlling a tolerance index a, a tolerance index d, and a tolerance index f of the activated carbon catalyst in phosgene synthesis, the tolerance performance of the activated carbon catalyst in a phosgene synthesis system is effectively improved, leading to an extended operation period. The activated carbon catalyst is suitable for high-temperature operation conditions, enabling the selection of a high-boiling-point substance as a cooling medium for the phosgene synthesis without needing to consider the tolerance of the activated carbon.

The purpose of the present invention is to provide a method for safely producing an acyl halide at low cost and with a low environmental burden. This method for producing an acid halide is characterized by comprising a step for irradiating a mixed gas containing methane, an elemental halogen gas, and oxygen with light.

The present invention relates to a method for producing phosgene, particularly a method for reacting phosgene with an organic amino compound to give an organic isocyanate. In this method, at least one carbon dioxide gas stream formed from the hydrolysis of an organically modified carbamate, optionally freed from secondary components, is reductively converted to carbon monoxide. The resulting carbon monoxide is reacted with chlorine in a phosgene synthesis to give phosgene. The organically modified carbamate for this method can preferably be obtained by chemical degradation of polyurethane materials after their useful life, particularly using alcohols, amines, or aminoalcohols as chemical degradation agents.

The invention relates to a process for producing phosgene, especially for the reaction of phosgene with organic amino compound to give organic isocyanate. In this process, at least one carbon dioxide gas stream that has been formed from a hydrolysis of organically modified carbamate and may have been freed of secondary constituents is reductively converted to carbon monoxide. The resulting carbon monoxide is reacted with chlorine in a phosgene synthesis to give phosgene. The organically modified carbamate for the process can preferably be obtained from a chemolysis of end-of-life polyurethane material, especially with alcohols, amines or amino alcohols as chemolysis reagent.

A continuous synthesis method and device of triphosgene belong to the technical field of fine chemical production. The continuous synthesis method of triphosgene comprises the following steps: S1, continuously conveying dimethyl carbonate to the lower part of a reactor, and continuously inputting chlorine from the bottom of the reactor; S2, after the dimethyl carbonate and the chlorine are mixed in the reactor, a reaction is initiated by irradiation of an ultraviolet light source with a wavelength of 295-395 nm, to generate molten triphosgene and hydrogen chloride gas; wherein the temperature in the reactor gradually increases from bottom to top, presenting a temperature gradient; S3, the molten triphosgene continuously overflows to a degassing tower to remove residual hydrogen chloride under vacuum, and the molten triphosgene product after degassing enters a flaking section. Through optimization of reaction conditions and equipment design, the application can reduce cost, improve the utilization rate of raw materials, reduce the generation of by-products, while ensuring the safety and efficiency of the reaction, and realize efficient, safe and continuous production of triphosgene.

The invention relates to a method for producing hexamethylene diisocyanates according to claim 1 and to a method for producing polyurethanes from hexamethylene diisocyanates, wherein methanol is used as a starting material for constructing the hexamethylene moieties in hexamethylene diisocyanates.

A process of separating phosgene and hydrogen chloride, comprises: conveying a mixed stream containing hydrogen chloride and phosgene into a distillation column; withdrawing from the distillation column a bottom stream containing phosgene; withdrawing a top stream containing hydrogen chloride; compressing at least a portion of the top stream and at least partially condensing the compressed top stream to form a liquid stream, decompressing at least a portion of the liquid stream to form a cooled liquid stream and a cooled gas stream; and recycling the cooled liquid stream to the top of the distillation column as a reflux; the process additionally comprising temporarily introducing an absorbing solvent into the distillation column, in particular during starting-up and / or shutting-down of the process. The process allows for safe operation even when hydrogen chloride production only gradually begins or decreases, without the necessity of storing hydrogen chloride.