Phosgene synthesis device
By setting up a primary reactor and a secondary reactor in the phosgene synthesis device, using heat transfer oil and cooling water for cooling respectively, and recovering the heat of reaction to generate steam, the energy waste caused by hot water cooling in the phosgene synthesis reaction is solved, and the heat utilization rate and chlorine conversion rate are improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-27
- Publication Date
- 2026-04-07
AI Technical Summary
The energy waste caused by hot water cooling during phosgene synthesis results in low heat utilization efficiency.
The primary and secondary reactors are each equipped with cooling components, using heat transfer oil and cooling water for cooling respectively. The heat from the primary reactor is recovered by a steam generator to generate steam for other processes. The secondary reactor acts as a cooler and protector to further reduce the temperature.
It improves the utilization rate of reaction heat, reduces energy waste, meets the residual chlorine content requirements of downstream processes, lowers phosgene temperature, and improves chlorine conversion rate.
Smart Images
Figure CN224086683U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the light gas synthesis technical field, concretely relates to a light gas synthesis device. BACKGROUND
[0002] Light gas (COCl2), also known as carbonyl chloride, has the rotten licorice, rotten apple smell, is a kind of toxic gas, belongs to asphyxiating poison agent, and inhaling light gas can cause pulmonary edema, pneumonia and the like, has the danger of death, and light gas is an important organic intermediate and is a very active electrophile, is widely used in the production of pesticide, dye, initiator, medicine, fine chemicals and isocyanate (MDI). There are many preparation methods of light gas, such as: carbon monoxide and chlorine gas mixed light illumination method, carbon monoxide and chlorine gas synthesis method using chlorophosphine catalyst, carbon monoxide high-temperature reaction in metal chloride, fuming sulfuric acid and carbon tetrachloride reaction method, thermal decomposition method using chromium acid oxidation aliphatic chloride and chloroformic acid trichloromethyl ester, oxalic acid perchloro methyl ester and the like. At present, the production of light gas in industry usually takes carbon monoxide and chlorine gas as main raw materials, and takes activated carbon as catalyst to synthesize, and the light gas synthesis reaction is exothermic reaction, and the unit chlorine gas heat release amount is 116kJ / mol, and light gas can decompose under high temperature, if the reaction heat is not removed in time, the light gas decomposition rate will be more than 80%, under the action of high temperature, light gas decomposes into carbon monoxide and chlorine gas, leading to the increase of residual chlorine, which causes the influence on subsequent process. In order to avoid light gas decomposition and excessive free chlorine, after the generation of light gas, the reaction product must be cooled immediately to ensure that the generated light gas does not have any significant thermal decomposition, so it is necessary to remove the reaction heat in the light gas synthesis reactor in time, and the tube of the light gas synthesis reactor is provided with activated carbon catalyst, which is used to catalyze the light gas synthesis reaction, and the shell of the light gas synthesis reactor is provided with cooling medium, and the cooling medium used is hot water, and a special hot water system is provided. In the light gas synthesis reaction process, the reaction heat generated by light gas synthesis is removed by hot water, and the hot water return water is cooled again and used as cooling medium for circulation, and a large amount of heat energy is lost in the hot water return water cooling process, and the reaction heat utilization rate is low. UTILITY MODEL CONTENTS
[0003] The utility model aims at providing a light gas synthesis device, and aims at solving the problem of a large amount of energy waste in the hot water cooling process in the light gas synthesis reaction process.
[0004] To achieve the above object, the utility model provides technical scheme is: provide a kind of light gas synthesis device, including primary reactor, secondary reactor, primary cooling component and secondary cooling component, the primary cooling component is used to cool the primary reactor, steam generator is connected on the primary cooling component, the secondary cooling component is used to cool the secondary reactor, primary feed pipe and primary discharge pipe are connected on the primary reactor, secondary feed pipe and secondary discharge pipe are connected on the secondary reactor, the primary feed pipe is suitable for raw material to be discharged into the primary reactor, the primary discharge pipe other end connects the secondary feed pipe, the secondary discharge pipe is suitable for the discharge of light gas.
[0005] In a possible implementation manner, the primary cooling component includes a primary oil inlet pipe and a primary oil outlet pipe, the primary oil inlet pipe and the primary oil outlet pipe are connected to the shell side of the primary reactor respectively, and the cooling medium of the primary cooling component is heat conducting oil.
[0006] In a possible implementation manner, the primary cooling component further includes a hot oil tank and a hot oil pump, the hot oil tank is connected to the primary oil inlet pipe through an oil conveying pipe, and the hot oil pump is arranged on the oil conveying pipe.
[0007] In a possible implementation manner, the oil conveying pipe is provided with a hot oil heater.
[0008] In a possible implementation manner, the steam heater of the steam generator is connected to the primary oil outlet pipe, and the steam heater is further connected to a steam oil outlet pipe.
[0009] In a possible implementation manner, the steam oil outlet pipe is connected to the oil conveying pipe.
[0010] In a possible implementation manner, the discharge port of the steam oil outlet pipe is arranged between the hot oil tank and the hot oil pump.
[0011] In a possible implementation manner, the secondary reactor is provided with multiple groups.
[0012] In a possible implementation manner, the secondary cooling component includes a secondary water inlet pipe and a secondary water outlet pipe, the secondary water inlet pipe and the secondary water outlet pipe are connected to the shell side of the secondary reactor respectively, and the cooling medium of the secondary cooling component is cooling water.
[0013] In a possible implementation manner, the primary feed pipe is connected to an intermediate feed pipe, and the other end of the intermediate feed pipe is connected to the secondary feed pipe.
[0014] The light gas synthesis device provided by the utility model has the following beneficial effects:
[0015] Compared with existing technologies, this system includes a primary reactor, a secondary reactor, a primary cooling assembly, and a secondary cooling assembly. The primary cooling assembly is matched to the primary reactor and is used to cool it. The primary cooling assembly is connected to the shell side of the primary reactor and removes the heat from the phosgene reaction within the tubes of the primary reactor. A steam generator is connected to the primary cooling assembly, and the heat removed from the phosgene reaction is used to generate steam, thus recovering and utilizing the heat of reaction from the phosgene reaction. The generated steam can be used in other processes, reducing energy waste. The secondary cooling assembly is matched to the secondary reactor and is used to cool it. The secondary cooling assembly is connected to the shell side of the secondary reactor and removes the heat from the phosgene reaction within the tubes of the secondary reactor. The primary reactor serves as the main reactor for the phosgene reaction, where the raw materials CO and Cl2 are reacted... After mixing, the phosgene enters the primary reactor through the primary feed pipe, where a phosgene reaction occurs. The phosgene temperature at the outlet of the primary reactor is controlled between 150 and 230°C. The primary discharge pipe of the primary reactor connects the primary reactor to the secondary feed pipe of the secondary reactor. The primary cooling component can quickly and promptly remove the heat of reaction from the primary reactor, which then enters the steam generator to exchange heat with the boiler water and generate steam. The high-temperature phosgene generated in the primary reactor enters the catalyst bed of the secondary reactor for continuous reaction. The secondary reactor acts as a cooler and protector, with the phosgene temperature at the outlet controlled between 60 and 80°C. The secondary cooling component cools the secondary reactor in a timely manner and removes the heat of reaction, further improving the chlorine conversion rate, meeting the downstream residual chlorine content requirements, and simultaneously reducing the phosgene temperature at the outlet. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0017] Figure 1 This is a schematic diagram of the phosgene synthesis apparatus provided in an embodiment of the present invention.
[0018] In the diagram: 1. Primary feed pipe; 2. Primary reactor; 3. Primary discharge pipe; 4. Hot oil tank; 5. Oil delivery pipe; 6. Hot oil pump; 7. Hot oil heater; 8. Primary oil inlet pipe; 9. Primary oil outlet pipe; 10. Steam generator; 11. Steam outlet pipe; 12. Secondary feed pipe; 13. Intermediate feed pipe; 14. Secondary reactor; 15. Secondary discharge pipe; 16. Secondary water inlet pipe; 17. Secondary water outlet pipe. Detailed Implementation
[0019] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.
[0020] Please refer to Figure 1 The present invention provides a specific embodiment of a phosgene synthesis device, comprising a primary reactor 2, a secondary reactor 14, a primary cooling assembly, and a secondary cooling assembly. The primary cooling assembly is used to cool the primary reactor 2 and is connected to a steam generator 10. The secondary cooling assembly is used to cool the secondary reactor 14. The primary reactor 2 is connected to a primary feed pipe 1 and a primary discharge pipe 3. The secondary reactor 14 is connected to a secondary feed pipe 12 and a secondary discharge pipe 15. The primary feed pipe 1 is suitable for discharging raw materials into the primary reactor 2. The other end of the primary discharge pipe 3 is connected to the secondary feed pipe 12. The secondary discharge pipe 15 is suitable for discharging phosgene.
[0021] This invention provides a phosgene synthesis apparatus, which, compared with existing technologies, includes a primary reactor 2, a secondary reactor 14, a primary cooling assembly, and a secondary cooling assembly. The primary cooling assembly is matched to the primary reactor 2 and is used to cool the primary reactor 2. The primary cooling assembly is connected to the shell side of the primary reactor 2 and removes the heat from the phosgene reaction within the tube side of the primary reactor 2. A steam generator 10 is connected to the primary cooling assembly, and the heat from the phosgene reaction removed by the primary cooling assembly is used by the steam generator 10 to produce steam, thus recovering and utilizing the heat of reaction from the phosgene reaction. The generated steam can be used in other processes, reducing energy waste. The secondary cooling assembly is matched to the secondary reactor 14 and is used to cool the secondary reactor 14. The secondary cooling assembly is connected to the shell side of the secondary reactor 14 and removes the heat from the phosgene reaction within the tube side of the secondary reactor 14. The primary reactor 2 serves as the main reactor for the phosgene reaction, and the raw materials... After CO and Cl2 are mixed, they enter the primary reactor 2 through the primary feed pipe 1, where a phosgene reaction occurs. The phosgene temperature at the outlet of the primary reactor 2 is controlled between 150 and 230°C. The primary discharge pipe 3 of the primary reactor 2 connects the primary reactor 2 to the secondary feed pipe 12 of the secondary reactor 14. The primary cooling component can quickly and promptly remove the heat of reaction from the primary reactor 2, which enters the steam generator 10 to exchange heat with the boiler water and generate steam. The high-temperature phosgene generated in the primary reactor 2 enters the catalyst bed of the secondary reactor 14 for continuous reaction. The secondary reactor 14 acts as a cooler and protector, and the phosgene temperature at the outlet of the secondary reactor 14 is controlled between 60 and 80°C. The secondary cooling component cools the secondary reactor 14 in a timely manner and removes the heat of reaction, further improving the chlorine conversion rate, meeting the downstream residual chlorine content requirements, and reducing the phosgene temperature at the outlet.
[0022] For details, please refer to Figure 1The reactor includes a primary reactor 2, a secondary reactor 14, a primary cooling assembly, and a secondary cooling assembly. The primary cooling assembly is connected to the shell side of the primary reactor 2 and is used to cool the primary reactor 2. The secondary cooling assembly is connected to the shell side of the secondary reactor 14 and is used to cool the secondary reactor 14. A steam generator 10 is installed on the primary cooling assembly. The steam generator 10 absorbs the heat carried by the primary cooling assembly and generates steam. The steam generated by the steam generator 10 can be used in other processes to recover and utilize the heat of reaction of the phosgene reaction, reducing energy waste. Primary reactor 2... The reactor is connected to a primary feed pipe 1 and a primary discharge pipe 3. The primary feed pipe 1 is suitable for transporting raw materials CO and Cl2. A feed tee is provided at the feed end of the primary feed pipe 1, with the other two ends of the tee suitable for discharging CO and Cl2 respectively. CO and Cl2 undergo preliminary mixing within the primary feed pipe 1. The discharge end of the primary feed pipe 1 is located at the upper end of the primary reactor 2, where CO and Cl2 react within the tube side of the primary reactor 2. The feed end of the primary discharge pipe 3 is located at the lower end of the primary reactor 2, and the primary discharge pipe 3 is used to discharge high-temperature phosgene. The primary cooling assembly is connected to the primary reactor... The primary cooling unit 2 is used to cool the primary reactor 2. It is connected to the shell side of the primary reactor 2 and removes the heat from the phosgene reaction within the tube side. The steam generator 10 is connected to the primary cooling unit. The heat removed by the primary cooling unit is used by the steam generator 10 to produce steam, thus recovering and utilizing the heat of the phosgene reaction. The generated steam can be used in other processes, reducing energy waste. The secondary reactor 14 is connected to a secondary feed pipe 12 and a secondary discharge pipe 15. The discharge end of the secondary feed pipe 12 is located at the secondary reactor 14. At the upper end, the feed end of the secondary discharge pipe 15 is located at the lower end of the secondary reactor 14. The discharge end of the primary discharge pipe 3 is connected to the feed end of the secondary feed pipe 12. The high-temperature phosgene in the primary reactor 2 enters the catalyst bed of the secondary reactor 14 through the primary discharge pipe 3 and the secondary feed pipe 12 for continuous reaction. The secondary reactor 14 serves as a cooler and protector. The secondary cooling component is connected to the shell side of the secondary reactor 14 to remove the heat of the phosgene reaction in the tube side of the secondary reactor 14, further improving the chlorine conversion rate, meeting the downstream residual chlorine content requirements, and reducing the phosgene temperature on the outlet side.
[0023] As a specific embodiment of the phosgene synthesis device provided by this utility model, please refer to Figure 1 The primary cooling assembly includes a primary oil inlet pipe 8 and a primary oil outlet pipe 9, which are respectively connected to the shell side of the primary reactor 2. The cooling medium of the primary cooling assembly is heat transfer oil.
[0024] For details, please refer to Figure 1The primary cooling assembly includes a primary oil inlet pipe 8 and a primary oil outlet pipe 9. The outlet end of the primary oil inlet pipe 8 is connected to the inlet of the shell side of the primary reactor 2, which is located at the lower end of the primary reactor 2. The inlet end of the primary oil outlet pipe 9 is connected to the outlet of the shell side of the primary reactor 2, which is located at the upper end of the primary reactor 2. The cooling medium introduced into the primary cooling assembly is heat transfer oil, preferably hydrogenated terphenyl heat transfer oil. Using heat transfer oil as the cooling medium can carry more heat than using cooling water.
[0025] As a specific embodiment of the phosgene synthesis device provided by this utility model, please refer to Figure 1 The primary cooling assembly also includes a hot oil tank 4 and a hot oil pump 6. The hot oil tank 4 is connected to the primary oil inlet pipe 8 via an oil delivery pipe 5, and the hot oil pump 6 is installed on the oil delivery pipe 5.
[0026] For details, please refer to Figure 1 The primary cooling assembly also includes a hot oil tank 4 and a hot oil pump 6. The hot oil tank 4 is used to provide storage for heat transfer oil. An oil supply pipe 5 is connected to the hot oil tank 4. The oil supply pipe 5 is connected to the primary oil inlet pipe 8. The hot oil pump 6 is installed on the oil supply pipe 5 to facilitate the supply of heat transfer oil to the primary oil inlet pipe 8.
[0027] As a specific embodiment of the phosgene synthesis device provided by this utility model, please refer to Figure 1 A hot oil heater 7 is installed on the oil pipeline 5.
[0028] For details, please refer to Figure 1 The hot oil heater 7 is used to heat the heat transfer oil when the unit is started up, so as to meet the phosgene outlet temperature of the first-stage reactor 2. The first end of the hot oil heater 7 is connected to the oil supply pipe 5, and the second end of the hot oil heater 7 is connected to the first-stage oil inlet pipe 8. The hot oil heater 7 is located between the hot oil pump 6 and the first-stage reactor 2.
[0029] As a specific embodiment of the phosgene synthesis device provided by this utility model, please refer to Figure 1 The steam heater of the steam generator 10 is connected to the first-stage oil outlet pipe 9, and the steam heater is also connected to the steam oil outlet pipe 11.
[0030] For details, please refer to Figure 1 The discharge end of the primary oil outlet pipe 9 is connected to the inlet of the steam heater of the steam generator 10, and the outlet of the steam heater of the steam generator 10 is connected to the steam oil outlet pipe 11. Boiler water enters the steam generator 10, is heated and turned into steam, and the generated steam can be used in other processes to realize the recovery and utilization of the reaction heat of phosgene synthesis reaction.
[0031] As a specific embodiment of the phosgene synthesis device provided by this utility model, please refer to Figure 1 Steam outlet pipe 11 is connected to oil delivery pipe 5.
[0032] For details, please refer to Figure 1 The outlet of the steam oil outlet pipe 11 is connected to the oil supply pipe 5. The heat transfer oil in the steam oil outlet pipe 11 is sent back into the shell side of the first-stage reactor 2 to realize the recycling of heat transfer oil and reduce production costs.
[0033] As a specific embodiment of the phosgene synthesis device provided by this utility model, please refer to Figure 1 The outlet of the steam oil outlet pipe 11 is located between the hot oil tank 4 and the hot oil pump 6.
[0034] For details, please refer to Figure 1 The outlet of the steam oil outlet pipe 11 is located on the oil supply pipe 5 and between the hot oil tank 4 and the hot oil pump 6. After the heat exchange is completed, the heat transfer oil flows back into the oil supply pipe 5 and is sent back into the shell side of the first-stage reactor 2 under the action of the hot oil pump 6, so as to realize the recycling of heat transfer oil and reduce production costs.
[0035] As a specific embodiment of the phosgene synthesis device provided by this utility model, please refer to Figure 1 There are multiple sets of secondary reactors 14.
[0036] For details, please refer to Figure 1 The secondary reactor 14 is provided in multiple sets, which are set in parallel, and the secondary reactor 14 can be selected and switched according to the actual situation.
[0037] As a specific embodiment of the phosgene synthesis device provided by this utility model, please refer to Figure 1 The secondary cooling assembly includes a secondary water inlet pipe 16 and a secondary water outlet pipe 17, which are respectively connected to the shell side of the secondary reactor 14. The cooling medium of the secondary cooling assembly is cooling water.
[0038] For details, please refer to Figure 1 The secondary cooling assembly includes a secondary water inlet pipe 16 and a secondary water outlet pipe 17. The outlet end of the secondary water inlet pipe 16 is connected to the inlet of the shell side of the secondary reactor 14, which is located at the lower end of the secondary reactor 14. The inlet end of the secondary water outlet pipe 17 is connected to the outlet of the shell side of the secondary reactor 14, which is located at the upper end of the secondary reactor 14. The cooling medium flowing into the secondary cooling assembly is cooling water.
[0039] As a specific embodiment of the phosgene synthesis device provided by this utility model, please refer to Figure 1An intermediate feed pipe 13 is connected to the primary feed pipe 1, and the other end of the intermediate feed pipe 13 is connected to the secondary feed pipe 12.
[0040] For details, please refer to The inlet of the intermediate feed pipe 13 is connected to the primary feed pipe 1, and the outlet of the intermediate feed pipe 13 is connected to the secondary feed pipe 12. The raw materials CO and Cl2 can be directly discharged into the secondary reactor 14 through the intermediate feed pipe 13. The intermediate feed pipe 13 can be blocked or opened according to the actual situation. When the primary reactor 2 is used for production, the intermediate feed pipe 13 is blocked with a blind plate. When the reactor needs to be switched and the primary reactor 2 is not used, and only the secondary reactor 14 is used, the intermediate feed pipe 13 is opened to supplement the secondary reactor 14 with raw materials CO and Cl2.
[0041] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements 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 phosgene synthesis apparatus, characterized in that, It includes a primary reactor, a secondary reactor, a primary cooling assembly, and a secondary cooling assembly. The primary cooling assembly is used to cool the primary reactor and is connected to a steam generator. The secondary cooling assembly is used to cool the secondary reactor. The primary reactor is connected to a primary feed pipe and a primary discharge pipe. The secondary reactor is connected to a secondary feed pipe and a secondary discharge pipe. The primary feed pipe is suitable for discharging raw materials into the primary reactor. The other end of the primary discharge pipe is connected to the secondary feed pipe, and the secondary discharge pipe is suitable for discharging phosgene.
2. The phosgene synthesis apparatus as described in claim 1, characterized in that, The primary cooling assembly includes a primary oil inlet pipe and a primary oil outlet pipe, which are respectively connected to the shell side of the primary reactor. The cooling medium of the primary cooling assembly is heat transfer oil.
3. The phosgene synthesis apparatus as described in claim 2, characterized in that, The primary cooling assembly also includes a hot oil tank and a hot oil pump. The hot oil tank is connected to the primary oil inlet pipe via an oil delivery pipe, and the hot oil pump is mounted on the oil delivery pipe.
4. The phosgene synthesis apparatus as described in claim 3, characterized in that, A hot oil heater is installed on the oil pipeline.
5. The phosgene synthesis apparatus as described in claim 4, characterized in that, The steam heater of the steam generator is connected to the first-stage oil outlet pipe, and the steam heater is also connected to the steam oil outlet pipe.
6. The phosgene synthesis apparatus as described in claim 5, characterized in that, The steam outlet pipe is connected to the oil delivery pipe.
7. The phosgene synthesis apparatus as described in claim 6, characterized in that, The outlet of the steam oil outlet pipe is located between the hot oil tank and the hot oil pump.
8. The phosgene synthesis apparatus as described in claim 1, characterized in that, The secondary reactor is provided in multiple sets.
9. The phosgene synthesis apparatus as described in claim 1, characterized in that, The secondary cooling assembly includes a secondary inlet pipe and a secondary outlet pipe, which are respectively connected to the shell side of the secondary reactor. The cooling medium of the secondary cooling assembly is cooling water.
10. The phosgene synthesis apparatus as described in claim 1, characterized in that, An intermediate feed pipe is connected to the primary feed pipe, and the other end of the intermediate feed pipe is connected to the secondary feed pipe.