Isocapryloyl chloride production system

Abstract

The utility model provides an isocapryloyl chloride production system. The isocapryloyl chloride production system comprises a reaction unit, a tail gas treatment unit and a distillation unit, the reaction unit comprises a reaction kettle, a circulating pipeline, and a nitrogen supply pipeline, a solvent supply pipeline, a catalyst supply pipeline, an isocaprylic acid supply pipeline and a phosgene supply pipeline which are connected with the reaction kettle; the reaction kettle is provided with a tail gas outlet and an emergency gas release port which are connected with the tail gas treatment unit; a circulating inlet is formed in the side wall of the reaction kettle; the circulating pipeline is connected with the discharge hole and the circulating inlet; a pipeline, extending into the reaction kettle, of the isocaprylic acid supply pipeline is of a sleeve structure, and isocaprylic acid enters from an inner pipe; the nitrogen supply pipeline and the phosgene supply pipeline both extend into the bottom of the inner cavity of the reaction kettle, and the phosgene supply pipeline is also communicated with the outer pipe of the sleeve structure; and a non-condensable gas outlet of the distillation unit is connected with the tail gas treatment unit. The isocapryloyl chloride production system disclosed by the utility model is good in tail gas treatment effect, reactants can be fully mixed, and the phosgene content in reaction completion liquid is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to isopropyl chloroformate production technical field, especially is related to a kind of isopropyl chloroformate production system. BACKGROUND

[0002] Isopropyl chloroformate (2-ethyl hexanoyl chloride) is an important organic synthesis intermediate, chemical formula is C8H 15 ClO, molecular weight is 162.66. It is a colorless or light yellow transparent liquid, with strong irritating odor. Isopropyl chloroformate reactivity is higher, can occur acylation with amine, alcohol and so on, generates corresponding amide and ester compound.

[0003] Synthesis of isopropyl chloroformate by phosgene is a more common preparation method. With isopropyl acid and phosgene (COCl2) as raw material, reaction is carried out in proper solvent (such as toluene), reaction generates isopropyl chloroformate, carbon dioxide and hydrogen chloride, after reaction is completed, isopropyl chloroformate is separated from reaction mixture by distillation or other separation method. The process of the current synthesis of isopropyl chloroformate by phosgene exists that phosgene and isopropyl acid are not fully reacted, phosgene content in reaction completion liquid is high, product quality is influenced;Tail gas treatment effect is poor, tail gas treatment route design needs to be improved;Manual participation degree is high, influences the health of operating personnel. UTILITY MODEL CONTENT

[0004] Therefore, to solve the above technical problems, the utility model provides an isopropyl chloroformate production system, which has reasonable structure, good tail gas treatment effect, low manual participation degree, can reduce the accumulation of reactants, ensure the full mixing of reactants, improve reaction efficiency, reduce the phosgene content in reaction completion liquid and improve product quality.

[0005] To achieve the above purpose, the technical scheme of the utility model is as follows:

[0006] An isopropyl chloroformate production system, comprising:

[0007] A reaction unit, the reaction unit comprises a reaction kettle, a circulating pipeline and a nitrogen gas supply pipeline, a solvent supply pipeline, a catalyst supply pipeline, an isopropyl acid supply pipeline and a phosgene supply pipeline connected with the top of the reaction kettle;The top of the reaction kettle is provided with a tail gas outlet and an emergency air release port, the bottom is provided with a discharge port, and the side wall is provided with a circulating inlet;The inlet end of the circulating pipeline is connected with the discharge port, and the outlet end of the circulating pipeline is connected with the circulating inlet;The outlet end of the nitrogen gas supply pipeline extends into the bottom of the inner cavity of the reaction kettle;The isopropyl acid supply pipeline is a sleeve structure, and the isopropyl acid enters the inner cavity of the reaction kettle from the inner tube;One outlet end of the phosgene supply pipeline extends into the bottom of the inner cavity of the reaction kettle, and the other outlet end is communicated with the outer tube of the sleeve structure;

[0008] The exhaust gas treatment unit includes an alkali destruction unit, a gas-liquid separation unit, and an exhaust gas fine treatment tower connected in sequence; the exhaust gas outlet and the emergency vent are connected to the inlet end of the alkali destruction unit through pipelines.

[0009] The distillation unit includes a vacuum distillation kettle, a condenser, and a collection tank connected in sequence; the inlet of the vacuum distillation kettle is connected to the circulation pipeline via a pipe; and the non-condensable gas outlet of the collection tank is connected to the tail gas purification tower via a pipe.

[0010] In the reaction unit, a circulation pipeline is installed outside the reactor. This pipeline pumps materials from the bottom of the reactor to the upper layer of the liquid, ensuring thorough mixing, reducing localized accumulation of reactants, and effectively improving reaction efficiency. The outlet of the nitrogen supply pipeline extends into the bottom of the reactor cavity. With the assistance of the stirring device inside the reactor, residual phosgene dissolved in the liquid is expelled, reducing the phosgene content in the finished product and improving product quality. The isooctanoic acid supply pipeline, which extends into the reactor, uses a sleeve structure. When phosgene is injected into the reactor, some of it is diverted into the sleeve. The pressure of the phosgene feed cuts the injected isooctanoic acid, achieving a certain premixing effect and simultaneously promoting uniform liquid separation of the isooctanoic acid, thus optimizing the reaction effect. The tail gas treatment unit includes an alkali destruction unit, a gas-liquid separation unit, and a tail gas refining tower, achieving multi-stage treatment and effectively optimizing the tail gas treatment effect. The transfer of reactants and other materials minimizes manual intervention, employing automated pipeline supply and transfer to avoid operator contact with toxic substances.

[0011] Furthermore, the circulation pipeline includes circulation pipe one, circulation pump, and circulation pipe two; one end of circulation pipe one is connected to the discharge port, and the other end is connected to the inlet of the circulation pump; one end of circulation pipe two is connected to the outlet of the circulation pump, and the other end is connected to the circulation inlet; both circulation pipe one and circulation pipe two are equipped with valves; the upstream section of the valve of circulation pipe two is connected to the inlet of the vacuum distillation kettle through a liquid transfer pipe equipped with a valve.

[0012] The circulating pump can extract the liquid from the bottom of the reactor and send it into the upper layer of liquid in the reactor through circulating pipe one and circulating pipe two, thereby realizing the self-circulation of the liquid in the reactor; after the reaction is completed, the finished liquid can be transferred to the vacuum distillation vessel through the liquid transfer pipe for vacuum distillation.

[0013] Furthermore, a valve is provided on the exhaust outlet, and a safety valve is provided on the emergency vent.

[0014] Furthermore, the nitrogen supply line, the solvent supply line, the catalyst supply line, the isooctanoic acid supply line, and the phosgene supply line are all equipped with flow meters and flow control valves.

[0015] Furthermore, the alkali destruction unit includes an alkali destruction tower one and an alkali destruction tower two connected in series, a blower one installed on a pipeline to provide power for gas flow and a pressure gauge for monitoring pressure, and an alkali supply pipeline for supplying alkali solution to the alkali destruction tower one and the alkali destruction tower two; the inlet end of the alkali destruction tower one is connected to the tail gas outlet and the emergency vent through a pipeline; the outlet end of the alkali destruction tower two is connected to the inlet end of the gas-liquid separation unit; and a flow meter and a flow control valve are provided on the alkali supply pipeline.

[0016] After the tail gas is treated by a two-stage alkali destruction tower and then separated into gas and liquid, the gas is further treated by a tail gas fine treatment tower to improve the tail gas treatment effect.

[0017] Furthermore, the alkali destruction unit also includes an alkali recovery tank; the bottom liquid outlets of both the alkali destruction tower one and the alkali destruction tower two are connected to the inlet end of the alkali recovery tank.

[0018] After being processed, the alkali recovered from the alkali recovery tank can be reintroduced into the alkali supply pipeline for reuse.

[0019] Furthermore, the gas-liquid separation unit is a gas-liquid separation tower, the gas outlet of the second alkali destruction tower is connected to the inlet of the gas-liquid separation tower, the bottom liquid outlet of the gas-liquid separation tower is connected to the inlet of the alkali recovery tank, and the top gas outlet of the gas-liquid separation tower is connected to the inlet of the tail gas purification tower.

[0020] The liquid separated by the gas-liquid separation unit can be recycled into the alkali recovery tank and added to the alkali recovery and reuse process.

[0021] Furthermore, the tail gas refining tower has a drying zone, an acid removal zone, and an organic gas removal zone arranged from bottom to top. Its inlet end is located at the bottom of the tower, and its outlet end is located at the top. A second fan is installed on the connecting pipe between the gas-liquid separation unit and the tail gas refining tower, and a third fan is installed on the connecting pipe between the liquid collection tank and the tail gas refining tower.

[0022] Furthermore, the exhaust port at the top of the vacuum distillation vessel is connected to the heat medium inlet of the condenser via a pipe, and the heat medium outlet of the condenser is connected to the feed port of the liquid collection tank via a pipe equipped with a liquid pump.

[0023] Furthermore, the distillation unit also includes a bottom liquid recovery tank; the bottom liquid outlet of the vacuum distillation vessel is connected to the inlet of the bottom liquid recovery tank via a pipe equipped with a valve.

[0024] Compared with the prior art, the isooctanoyl chloride production system of this utility model has the following advantages:

[0025] The isooctanoyl chloride production system of this utility model has a reasonable structural design. The reaction unit is equipped with a circulation pipeline and a sleeve structure, which, together with the stirring device of the reaction vessel, effectively improves the mixing effect between reactants, ensuring thorough mixing and preventing local accumulation of reactants, thereby improving reaction efficiency and optimizing product quality. The nitrogen supply pipeline extending into the inner cavity of the reaction vessel, together with the stirring device of the reaction vessel and the participation of the circulation pipeline, can expel residual phosgene dissolved in the feed liquid, reducing the residual phosgene content and improving product quality. At the same time, the tail gas treatment unit is reasonably set up to achieve multi-stage treatment, effectively optimizing the tail gas treatment effect. The entire process route mainly adopts automatic pipeline supply and transfer, avoiding operator contact with toxic substances. Attached Figure Description

[0026] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0027] Figure 1 This is a schematic diagram of the isooctanoyl chloride production system described in an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the sleeve structure described in an embodiment of the present utility model.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1-Reaction vessel, 2-Circulation pipeline, 3-Nitrogen supply pipeline, 4-Solvent supply pipeline, 5-Catalyst supply pipeline, 6-Isooctanoic acid supply pipeline, 7-Phosgene supply pipeline, 8-Tail gas outlet, 9-Emergency vent, 10-Circulation pipeline one, 11-Circulation pump, 12-Circulation pipeline two, 13-Casing structure, 14-Inner pipe, 15-Outer pipe, 16-Alkali recovery tank, 17-Tail gas purification tower, 18-Alkali destruction tower one, 19-Alkali destruction tower two, 20-Fan one, 21-Alkali supply pipeline, 22-Gas-liquid separation tower, 23-Fan two, 24-Bottom liquid recovery tank, 25-Vacuum distillation vessel, 26-Condenser, 27-Collection tank, 28-Feed-liquid transfer pipeline, 29-Liquid pump, 30-Fan three. Detailed Implementation

[0031] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments of the present invention can be combined with each other.

[0032] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0033] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0034] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0035] like Figure 1 As shown, an isooctanoyl chloride production system includes a reaction unit, a tail gas treatment unit, and a distillation unit.

[0036] The reaction unit includes a reaction vessel 1, a circulation pipeline 2, and a nitrogen supply pipeline 3, a solvent supply pipeline 4, a catalyst supply pipeline 5, an isooctanoic acid supply pipeline 6, and a phosgene supply pipeline 7 connected to the top of the reaction vessel 1.

[0037] The reactor 1 is equipped with a stirring device inside, a tail gas outlet 8 with a valve and an emergency vent 9 with a safety valve at the top, a discharge port at the bottom, and a circulation inlet on the side wall.

[0038] The circulation pipeline 2 includes circulation pipe 10, circulation pump 11, and circulation pipe 2 12; one end of circulation pipe 10 is connected to the discharge port and the other end is connected to the inlet of circulation pump 11; one end of circulation pipe 2 12 is connected to the outlet of circulation pump 11 and the other end is connected to the circulation inlet; both circulation pipe 10 and circulation pipe 2 12 are equipped with valves.

[0039] Flow meters and flow control valves are installed on nitrogen supply line 3, solvent supply line 4, catalyst supply line 5, isooctanoic acid supply line 6, and phosgene supply line 7; the outlet end of nitrogen supply line 3 extends into the bottom of the inner cavity of reactor 1; such as Figure 2As shown, the isooctanoic acid supply line 6 extends into the reactor 1 through a sleeve structure 13, and isooctanoic acid enters the inner cavity of the reactor 1 through the inner tube 14; one outlet end of the phosgene supply line 7 extends into the bottom of the inner cavity of the reactor 1, and the other outlet end is connected to the outer tube 15 of the sleeve structure 13.

[0040] The exhaust gas treatment unit includes an alkali destruction unit, a gas-liquid separation unit, an alkali recovery tank 16, and an exhaust gas fine treatment tower 17 connected in sequence.

[0041] The alkali destruction unit includes alkali destruction tower 18 and alkali destruction tower 29 connected in series, a blower 20 installed on the pipeline to provide power for gas flow and a pressure gauge for monitoring pressure, and an alkali supply pipeline 21 that provides alkali solution to alkali destruction tower 18 and alkali destruction tower 29; the inlet of alkali destruction tower 18 is connected to the tail gas outlet 8 and the emergency vent 9 through pipelines; the outlet of alkali destruction tower 29 is connected to the inlet of the gas-liquid separation unit; the bottom liquid outlets of alkali destruction tower 18 and alkali destruction tower 29 are both connected to the inlet of the alkali recovery tank 16; the alkali supply pipeline 21 is equipped with a flow meter and a flow control valve;

[0042] The gas-liquid separation unit is a gas-liquid separation tower 22. The gas outlet of the alkali destruction tower 2 19 is connected to the inlet of the gas-liquid separation tower 22. The gas outlet at the top of the gas-liquid separation tower 22 is connected to the inlet of the tail gas purification tower 17. The liquid outlet at the bottom of the gas-liquid separation tower 22 is connected to the inlet of the alkali recovery tank 16.

[0043] The tail gas purification tower 17 consists of a drying zone, an acid removal zone, and an organic gas removal zone from bottom to top. Its inlet is located at the bottom of the tower, and its outlet is located at the top. A fan 23 is installed on the connecting pipe between the gas-liquid separator 22 and the tail gas purification tower 17.

[0044] The distillation unit includes a bottom liquid recovery tank 24 and a vacuum distillation kettle 25, a condenser 26, and a liquid collection tank 27 connected in sequence;

[0045] The vacuum distillation vessel 25 is equipped with a stirring device, and a vacuum pipe with a valve and a nitrogen charging pipe are installed at the top. The inlet end of the top of the vacuum distillation vessel 25 is connected to the upstream section of the valve on the circulation pipe 12 via a liquid transfer pipe 28 with a valve. The outlet end of the bottom liquid of the vacuum distillation vessel 25 is connected to the inlet end of the bottom liquid recovery tank 24 via a pipe with a valve. The exhaust port at the top of the vacuum distillation vessel 25 is connected to the inlet of the heat medium of the condenser 26 via a pipe. The outlet of the heat medium of the condenser 26 is connected to the inlet of the collection tank 27 via a pipe equipped with a liquid pump 29. The non-condensable gas outlet of the collection tank 27 is connected to the inlet end of the tail gas purification tower 17 via a pipe equipped with a blower 30.

[0046] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A system for the production of isooctyl chloroformate, characterized in that, The application relates to a reaction device for preparing isocyanate, which comprises a reaction unit, a tail gas treatment unit and a distillation unit. The reaction unit comprises a reaction kettle, a circulating pipeline and nitrogen supply pipelines, solvent supply pipelines, catalyst supply pipelines, isooctanoic acid supply pipelines and phosgene supply pipelines connected with the top of the reaction kettle; the top of the reaction kettle is provided with a tail gas outlet and an emergency gas outlet, the bottom is provided with a discharge port, and the side wall is provided with a circulating inlet; the inlet end of the circulating pipeline is connected with the discharge port, and the outlet end of the circulating pipeline is connected with the circulating inlet; the outlet end of the nitrogen supply pipelines extends into the bottom of the inner cavity of the reaction kettle; the isooctanoic acid supply pipelines are in a sleeve structure, and the isooctanoic acid enters the inner cavity of the reaction kettle through the inner pipe; one outlet end of the phosgene supply pipelines extends into the bottom of the inner cavity of the reaction kettle, and the other outlet end is communicated with the outer pipe of the sleeve structure. The tail gas treatment unit comprises an alkali destruction unit, a gas-liquid separation unit and a tail gas treatment tower which are connected in sequence; the tail gas outlet and the emergency gas outlet are connected with the inlet end of the alkali destruction unit through pipelines. The distillation unit comprises a vacuum distillation kettle, a condenser and a liquid collecting tank which are connected in sequence; the inlet end of the vacuum distillation kettle is connected with the circulating pipeline through a pipeline; the non-condensed gas outlet of the liquid collecting tank is connected with the tail gas treatment tower through a pipeline.

2. The isooctanoyl chloride production system of claim 1, wherein: The circulating pipeline comprises a circulating pipeline I, a circulating pump and a circulating pipeline II; one end of the circulating pipeline I is connected with the discharge port, and the other end is connected with the inlet end of the circulating pump; one end of the circulating pipeline II is connected with the outlet end of the circulating pump, and the other end is connected with the circulating inlet; valves are arranged on the circulating pipeline I and the circulating pipeline II; the upstream section of the valve of the circulating pipeline II is connected with the inlet end of the vacuum distillation kettle through a liquid transfer pipeline provided with a valve.

3. The isooctanoyl chloride production system of claim 1, wherein: A valve is arranged on the tail gas outlet, and a safety valve is arranged on the emergency gas outlet.

4. The isooctanoyl chloride production system of claim 1, wherein: Flow meters and flow control valves are arranged on the nitrogen supply pipelines, the solvent supply pipelines, the catalyst supply pipelines, the isooctanoic acid supply pipelines and the phosgene supply pipelines.

5. The isooctyl chloride production system of claim 1, wherein: The alkali destruction unit comprises alkali destruction towers I and II, a fan I installed on a pipeline for providing power for gas flow, a pressure gauge for monitoring pressure and an alkali liquor supply pipeline for supplying alkali liquor to the alkali destruction towers I and II; the gas inlet end of the alkali destruction tower I is connected with the tail gas outlet and the emergency gas outlet through a pipeline; the gas outlet end of the alkali destruction tower II is connected with the inlet end of the gas-liquid separation unit; a flow meter and a flow control valve are arranged on the alkali liquor supply pipeline.

6. The isooctanoyl chloride production system of claim 5, wherein: The alkali destruction unit further comprises an alkali liquor recovery tank; the liquid outlet at the bottom of the alkali destruction towers I and II is connected with the inlet end of the alkali liquor recovery tank.

7. The isooctanoyl chloride production system of claim 6, wherein: The gas-liquid separation unit is a gas-liquid separation tower, the gas outlet end of the alkali destruction tower II is connected with the inlet end of the gas-liquid separation tower, the liquid outlet at the bottom of the gas-liquid separation tower is connected with the inlet end of the alkali liquor recovery tank, and the gas outlet at the top of the gas-liquid separation tower is connected with the inlet end of the tail gas treatment tower.

8. The isooctyl chloride production system of claim 1, wherein: The tail gas fine treatment tower has a tower body which is sequentially provided with a drying zone, an acid removal zone and an organic gas removal zone from bottom to top, and has an inlet end at a tower kettle and an outlet end at a top.

9. The isooctyl chloroformate production system of claim 1, wherein: The steam outlet of the top of the vacuum distillation kettle is connected with the heat medium inlet of the condenser through a pipeline, and the heat medium outlet of the condenser is connected with the feed inlet of the liquid collecting tank through a pipeline provided with a liquid pump.

10. The isooctanoyl chloride production system of claim 9, wherein: The distillation unit further comprises a kettle bottom liquid recovery tank, and the kettle bottom liquid outlet end of the vacuum distillation kettle is connected with the inlet end of the kettle bottom liquid recovery tank through a pipeline provided with a valve.

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