72results about "Phosgene" patented technology

The invention discloses a preparation method of carbonyl fluoride, which comprises the following steps: with hexafluoropropylene and oxygen as raw materials, introducing gas into a reactor filled with a catalyst for reaction at high temperature; the catalyst is one of palladium oxide, ruthenium oxide, platinum oxide and molybdenum oxide. According to the scheme, the cost is low, the raw material utilization rate is high, and compared with other carbonyl fluoride synthesis methods, the reaction does not involve phosgene, fluorine and other dangerous chemicals, and reaction by-products are few. In addition, according to the method, the toxicity of raw materials is small, hexafluoropropylene can be completely reacted under the condition of excessive oxygen, the reaction process is environment-friendly and simple, and basically no three wastes are generated. According to the method, hexafluoropropylene and oxygen are adopted as raw materials which are common chemical raw materials and are cheap and easy to obtain, and the method is simple in reaction process, mild in reaction, easy to operate and suitable for industrial production.

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.

Provided in the invention are a catalyst for preparing phosgene and a preparation method therefor, and a method for the preparation of phosgene and the comprehensive utilization of energy thereof. The preparation method comprises the following steps: 1) stirring and soaking activated carbon in a modifying solution, then adding dimethyltin dichloride and chromium oxide powders and carrying out a reaction, and then adding a nickel oxide fine powder and ultrasonically oscillating same to prepare a pre-modified activated carbon; 2) drying the pre-modified activated carbon; and 3) heating and calcinating the dried pre-modified activated carbon from step 2) to prepare the catalyst.

A method for producing phosgene from chlorine and carbon monoxide (1), the method being characterised in that carbon monoxide obtained by catalytic decomposition of methanol (4) is provided and this provided carbon monoxide (2) is reacted with chlorine to form phosgene (3). Using this method, low-emission phosgene for the production of isocyanates and polycarbonates can be provided, despite possible fluctuations in the provision of renewable energies. Methanol serves as the source for carbon monoxide, the methanol used for this purpose preferably being provided using regenerative energy from hydrogen and COx, where x=1 or 2.

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 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 discloses a phosgene production device and system and a phosgene production method, the phosgene production device comprises a reactor and a protective shell arranged outside the reactor, and a gap exists between the reactor and the protective shell. The phosgene production device disclosed by the invention adopts a double-layer structure, so that the production of phosgene is safer, and a gas-phase product is prevented from being in contact with the environment in an undesirable manner. According to the reactor of the phosgene production device, the auxiliary reactor is additionally arranged on the basis of the main reactor, the phosgene reaction efficiency is further improved, and it is guaranteed that the chlorine content at an outlet of the reactor is qualified. The reactor of the phosgene production device is provided with a refrigerating and heating integrated system, the reactor is preheated to 50-75 DEG C at the beginning of starting, and normal production can be achieved within 10 min after the reactor is started. In addition, the reactor of the phosgene production device also adopts an automatic DCS (Distributed Control System), so that stable production of the material system, the heat exchange system and the like is ensured.

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 method for the low-emission production of carbon monoxide (CO) for the production of phosgene, from which, for example, polycarbonates or organic isocyanates, and polyurethanes therefrom, can be produced using a process for the partial oxidation with gasification of polymeric recyclable materials. The invention further relates to a device that can be used for this purpose and to the use of said gasification process and / or polymeric recyclable materials to provide carbon monoxide for the production of phosgene.

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 process according to claim 1, in which nitric acid, as direct process product from a process for nitric acid preparation comprising the following steps: a) providing hydrogen gas (5d) and oxygen gas (5b) by performing a water electrolysis (5) in an electrolysis apparatus using electrical energy (10) produced from renewable energy and water (5c); b) providing ammonia (21b) as process product of a reaction of at least nitrogen (21a) and hydrogen gas (5d) from said water electrolysis (5) in an ammonia synthesis (21); c) preparing nitric acid (22) by reacting previously provided ammonia (21b) in a nitric acid preparation (22) at least with oxygen-containing gas (5e), is used for preparation 22 of organic amino compounds 17 for the synthesis of organic isocyanate compounds. Also described are the incorporation of this process into a process for preparing organic isocyanate compounds with these organic amino compounds, and an apparatus for performing the corresponding process.

The invention relates to a method for producing phosgene, in particular to a method for producing organic isocyanate by reacting phosgene with an organic amino compound. In the process, at least one gas stream of carbon dioxide, which has been formed by the hydrolysis of organic modified carbamates, and which may have been released by secondary components, is reduced to carbon monoxide. The generated carbon monoxide reacts with chlorine in phosgene synthesis to generate phosgene. The organically modified carbamates used in the method can preferably be obtained from the chemical decomposition of scrapped polyurethane materials, in particular using alcohols, ammonia or amino alcohols as chemical decomposition agents.

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.

The invention discloses an ionic liquid and a preparation method thereof, a carbon fiber loaded ionic liquid material and a preparation method thereof, and an application of the carbon fiber loaded ionic liquid material in phosgene preparation. According to the immobilized ionic liquid [PGPMims] [H3CSO3], in the phosgene absorption and purification process, a carbon fiber material loaded with the ionic liquid is adopted as a chemical absorbent for residual chlorine and bromine in phosgene, liquefied phosgene is fully absorbed, and the problem that after chlorine and bromine in phosgene are introduced into a photochemical system, the residual chlorine and bromine in phosgene cannot be recovered is solved. The problem that chloro MDI and bromo MDI are generated in the phosgenation reaction process is solved, the color number of crude MDI is increased, the impurity content is reduced, and the product quality is improved. The absorption and purification process is simple, low in operation cost and convenient to operate, and has certain effects of improving the production efficiency of the product and improving the application performance of the product.

A process is described for preparing at least isocyanates and optionally polyurethanes by synthesizing (1) phosgene (20) from carbon monoxide (21) and chlorine (22), converting (2) the phosgene (20) into diisocyanates (24) and hydrogen chloride (25) with diamines (23), providing a carbon dioxide gas stream (31) and purifying (4) the carbon dioxide gas stream (31) of secondary components, wherein the carbon dioxide is converted by means of an RWGS reaction (6) into carbon monoxide (21) and hydrogen (29), which are used as starting materials for the preparation of polyurethanes, and optionally converting (3) the diisocyanates (24) into polyurethanes (37) with polyether polyols (35a) and / or polyester polyols (35b).

The invention relates to a method for producing phosgene by reacting carbon monoxide and chlorine in the presence of a heterogeneous catalyst, comprising: (a) feeding chlorine and carbon monoxide into at least one reaction tube containing a catalyst; (b) reacting chlorine and 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 flowing through the 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 inlet temperature that increases from the starting temperature to the maximum temperature.

The present invention relates to a method for producing phosgene by gas phase reaction of carbon monoxide and chlorine in the presence of a catalyst in a reactor, the reactor comprising a plurality of contact tubes arranged parallel to one another, the contact tubes being filled with a catalyst and at least one fluid heat exchange medium flowing around the contact tubes, a feed stream of a mixture of a chlorine input stream and a carbon monoxide input stream being introduced into the contact tubes and reacting to form a product gas mixture containing phosgene, characterized in that the product gas mixture is discharged from the contact tubes at the outlet end of the contact tubes. The method of the present invention is characterized in that the gas phase reaction is carried out in the reactor so that the position of the highest temperature (hot spot) in the contact tube moves along the longitudinal axis of the contact tube at a predetermined migration speed, the migration speed of the hot spot in the longitudinal direction of the contact tube being 1 to 50 mm / day. The present invention also relates to a reactor for carrying out the method.

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 invention relates to a method for producing isocyanates and optionally polyurethanes by at least: synthesising (1) phosgene (20) from carbon monoxide (21) and chlorine (22); reacting (2) phosgene (20) with diamines (23) to form diisocyanates (24) and hydrogen chloride (25); providing a carbon dioxide gas flow (31); and cleaning (4) the carbon dioxide gas flow (31) of additional components, wherein the carbon dioxide is converted by means of an RWGS reaction (6) to form carbon monoxide (21) and hydrogen (29), which are used as raw materials for the polyurethane production, as well as optionally reacting (3) the diisocyanates (24) with polyether polyol (35a) and / or polyester polyol (35b) to form polyurethanes (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 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.