25results about "Phosgene" patented technology

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 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 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.

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 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.

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.

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.

The invention relates to a process for producing phosgene by reacting carbon monoxide and chlorine in the presence of a heterogeneous catalyst, comprising: (a) feeding the chlorine and the carbon monoxide into at least one reaction tube which contains the catalyst; (b) reacting the chlorine and the carbon monoxide, thereby forming a phosgene containing reaction gas; (c) cooling the at least one reaction tube by indirect heat transfer to a heat transfer medium which flows through a space surrounding the at least one reaction tube; (d) withdrawing the phosgene containing reaction gas from the at least one reaction tube, wherein the heat transfer medium supplied to the space surrounding the at least one reaction tube has an entrance temperature which is increased from a starting temperature to a maximum temperature.

The invention relates to a process for the production of phosgene comprising a gas phase reaction of carbon monoxide and chlorine in the presence of a carbon catalyst in a multi-tubular reactor, wherein the carbon catalyst comprises an amount of mesopores having a pore diameter in the range of from 2 to 50 nm of at least 0.45 ml / g of the total pore volume and the use of a carbon catalyst comprising an amount of mesopores having a pore diameter in the range of from 2 to 50 nm of at least 0.45 ml / g of the total pore volume, for the production of phosgene and a reaction mixture for preparing phosgene, the mixture comprising a catalyst for preparing phosgene comprising a porous material comprising carbon, micropores and mesopores, wherein said micropores have a pore diameter of less than 2 nm and wherein said mesopores have a pore diameter in the range of from 2 to 50 nm, wherein the volume of the mesopores of the porous material is of at least 0.45 ml / g, and a gas stream G comprising carbon monoxide (CO) and chlorine (Cl2).

The utility model relates to the technical field of phosgene recovery, in particular to a phosgene recovery system in the production process of triphenyl isocyanate thiophosphate, which comprises a phosgene absorption tower and a phosgene desorption tower, a feeding hole of the phosgene absorption tower is connected with a gas distribution plate, the gas distribution plate is a cavity container with uniform micropores in the upper surface, and the gas distribution plate is arranged in the solvent tank; the action principles and structures of the phosgene absorption tower and the phosgene desorption tower are improved, so that excessive phosgene can be fully recovered, the resource utilization rate is increased, and the application prospect is wide.

The invention relates to a process for the production of phosgene, comprising the gas phase reaction of carbon monoxide and chlorine in the presence of a carbon catalyst in a multitube reactor, wherein the carbon catalyst comprises a certain amount of mesopores having a pore size in the range of 2-50 nm and a total pore volume of at least 0.45 ml / g; to the use of a carbon catalyst for the production of phosgene, which carbon catalyst comprises a certain amount of mesopores having a pore size in the range of 2-50 nm and a total pore volume of at least 0.45 ml / g; and to a reaction mixture for the production of phosgene, which mixture comprises a catalyst for the production of phosgene comprising a porous material comprising carbon, micropores having a pore size of less than 2 nm and mesopores having a pore size in the range of 2-50 nm, wherein the mesopore volume of the porous material is at least 0.45 ml / g, and a gas stream G comprising carbon monoxide (CO) and chlorine (Cl2).

The invention relates to a method for producing isocyanates by reacting primary amines with phosgene in a gas-phase reaction in a plurality of gas-phase reaction units connected in parallel. Excess phosgene which is not converted in the gas phase reaction is returned as a circulation flow to the phosgene gas generation device so as to form a phosgene gas flow, and the state parameters of the formed phosgene gas flow are set by adjusting parameters of the circulation flow. Through the concept, stable reaction conditions of the gas phase reaction, especially stable stoichiometric excess of phosgene in a gas phase reaction device, can be ensured.

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

The application relates to an activated carbon catalyst for phosgene synthesis and an application method thereof. By controlling the endurance index a, the endurance index d and the endurance index f of the activated carbon catalyst in phosgene synthesis, the endurance performance of the activated carbon catalyst in a phosgene synthesis system is effectively improved, and the operation cycle is prolonged. The activated carbon catalyst is suitable for high-temperature operation conditions, so that high-boiling-point substances can be selected as the cooling medium for phosgene synthesis without considering the endurance capacity of the activated carbon.