System for producing n-octylamine through high-selectivity catalysis
By using high-selective catalysts and heat exchanger units in the n-octanoamine production system, high-temperature gas is used to exchange heat and collect and reuse raw material gas, the problems of high cost and waste of raw materials in the n-octanoamine production process are solved, and the effect of improving reaction efficiency and finished product purity is achieved.
Patent Information
- Application Number
- CN202422154034.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-03
- Publication Date
- 2025-05-09
- Estimated Expiration
- 2034-09-03
AI Technical Summary
In the production process of n-octamine, raw materials and finished products appear in gaseous form, resulting in the need of a large amount of heat exchange medium and cooling water, which increases production costs, and the activity of the catalyst has a great impact on the reaction efficiency and the purity of the finished product.
A system for high-selective catalytic production of n-octylamine is designed, including a fixed bed reactor, a heat exchanger unit and an ammonia collection device. By using a catalyst in a fixed bed reactor and using high-temperature gas for heat exchange, the raw materials are preheated and the finished product temperature is reduced; at the same time, the raw materials gas in the finished product is reused through an ammonia gas collection device to reduce raw material waste.
By improving the reaction efficiency, the energy required for heating and cooling of the finished product is reduced, and the production cost is reduced. At the same time, the purity and reaction efficiency of the finished product are improved through the activation of the catalyst and the full utilization of the raw materials.
Smart Images
Figure CN222842062U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of chemical production, in particular to a system for producing n-octylamine by high-selective catalysis. Background Art
[0002] The production process of n-octylamine is to generate n-octylamine by catalytic reaction of a mixed gas of ammonia and n-octanol in a fixed bed reactor. After the mixed gas of n-octylamine and raw materials is discharged from the fixed bed reactor, it needs to be cooled to effectively separate n-octylamine from the raw material gas. The crude n-octylamine after separation enters the subsequent process for distillation to obtain a finished product that meets the purity requirements.
[0003] During the reaction, both the raw materials and the finished products are in the form of gas. Therefore, the raw materials need to be heated and gasified, which requires a large amount of heat exchange medium for heat exchange. The final finished product needs to be cooled and liquefied, which requires a large amount of cooling water for heat exchange, which greatly increases the production cost. If the raw materials in the finished product are discharged with the tail gas, it will cause a waste of raw materials. In addition, the activity of the catalyst has a great influence on the degree of reaction, which can directly affect the purity of the final product and the efficiency of the reaction. Summary of the invention
[0004] In order to improve the reaction efficiency and reduce the production cost in the process of preparing n-octylamine, the utility model provides a system for producing n-octylamine by high-selective catalysis.
[0005] The technical solution adopted by the utility model is:
[0006] A system for producing n-octylamine by high-selectivity catalysis comprises a fixed bed reactor, a catalyst is contained in the fixed bed reactor, a raw material inlet is arranged at the top of the fixed bed reactor, a raw material outlet is arranged at the bottom of the fixed bed reactor, the raw material inlet of the fixed bed reactor is connected to the bottom of a raw material mixing tank through a pipeline, an ammonia inlet is arranged at the top of the raw material mixing tank, the ammonia inlet is connected to an ammonia pipeline, an n-octanol inlet is arranged in the middle of the raw material mixing tank, the n-octanol inlet is connected to the n-octanol pipeline; the ammonia pipeline and the n-octanol pipeline are respectively connected to a heat exchanger unit, the heat exchanger unit comprises three heat exchangers, and the three heat exchangers are all shell and tube heat exchangers; a first The tube side of the heat exchanger is connected in series between the n-octanol pipeline and the n-octanol inlet of the raw material mixing tank, the tube side of the second heat exchanger is connected in series between the ammonia pipeline and the ammonia inlet of the raw material mixing tank, circulating cooling water is passed through the tube side of the third heat exchanger, the shell side of the first heat exchanger is connected to the raw material outlet of the fixed bed reactor through a pipeline; the shell side of the first heat exchanger is connected to the shell side of the second heat exchanger, the shell side of the second heat exchanger is connected to the shell side of the third heat exchanger, and the shell side of the third heat exchanger is connected to the finished product tank through a pipeline; the top of the finished product tank is connected to an ammonia collecting device through a pipeline, and the ammonia collecting device is connected to the middle of the raw material mixing tank through a pipeline.
[0007] Furthermore, the ammonia collection device includes an ammonia inlet buffer tank, a compressor and an ammonia outlet buffer tank. The middle part of the ammonia inlet buffer tank is connected to the top of the finished product tank through a pipeline, the top of the ammonia inlet buffer tank is connected to the air intake of the compressor through a pipeline, the air outlet of the compressor is connected to the middle part of the ammonia outlet buffer tank through a pipeline, and the top of the ammonia outlet buffer tank is connected to the middle part of the raw material mixing tank through a pipeline.
[0008] Furthermore, it comprises two ammonia inlet buffer tanks arranged in series and two ammonia outlet buffer tanks arranged in series, a connecting pipe is installed between the first ammonia inlet buffer tank and the second ammonia outlet buffer tank, and a control valve is installed on the connecting pipe.
[0009] Furthermore, an activated gas pipeline is connected to the bottom of the fixed bed reactor, and the activated gas pipeline extends from the bottom of the fixed bed reactor to the reaction bed inside.
[0010] Furthermore, a finished product output pipeline is connected to the bottom of the finished product tank, and the finished product output pipeline is connected to a distillation station.
[0011] Furthermore, a venting branch is installed on the top of the finished product tank, and a control valve is installed on the venting branch.
[0012] Furthermore, the three heat exchangers are distributed from top to bottom, each heat exchanger is tilted, and the tilt directions of adjacent heat exchangers are different; the bottom of the shell side of the lower end of the first heat exchanger is connected to the top of the shell side of the higher end of the second heat exchanger through a pipeline, the bottom of the shell side of the lower end of the second heat exchanger is connected to the top of the shell side of the higher end of the third heat exchanger through a pipeline, and the shell side of the lower end of the third heat exchanger is connected to the finished product tank through a pipeline.
[0013] Furthermore, a delivery pump is installed on the n-octanol pipeline, and the ammonia pipeline is connected to an ammonia gasification device.
[0014] Furthermore, a heat exchange coil is installed in the raw material mixing tank, and circulating hot oil is passed through the heat exchange coil.
[0015] After adopting the above technical scheme, the beneficial effects of the utility model are:
[0016] By using the high-temperature gas generated in the fixed bed reactor as a heat source to exchange heat with the raw materials respectively, the temperature of the finished product can be lowered while the raw materials are preheated, so that it can be partially liquefied, and the amount of high-temperature hot oil required for heating the raw materials and the amount of cooling water required for cooling the finished products can be reduced, thereby reducing the cost of the reaction; by separating and compressing the raw material gas in the finished product and then sending it into the raw material mixing tank for continued reaction, the raw materials can be fully utilized to avoid waste; by introducing activation gas into the fixed bed, the catalyst is fully dispersed in the bed layer, the activity of the catalyst is increased, the selectivity of the catalyst to the characteristic structure is improved, and the conversion rate of the target product is improved. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is the principle diagram of the reaction system of the utility model.
[0018] In the figure: ammonia pipeline 1, n-octanol pipeline 2, heat exchanger unit 3, first heat exchanger 31, second heat exchanger 32, third heat exchanger 33, raw material mixing tank 4, fixed bed reactor 5, finished product tank 6, ammonia collection device 7, ammonia inlet buffer tank 71, compressor 72, ammonia outlet buffer tank 73, delivery pump 8, activated gas pipeline 9, venting branch 10. DETAILED DESCRIPTION
[0019] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings:
[0020] like Figure 1 As shown, a system for producing n-octylamine by high-selectivity catalysis is composed of an ammonia pipeline 1, an n-octanol pipeline 2, a heat exchanger unit 3, a raw material mixing tank 4, a fixed bed reactor 5, a finished product tank 6, an ammonia collection device 7 and related pipelines and valves and other components, and is used for the preparation of n-octylamine.
[0021] The ammonia pipeline 1 is connected to an ammonia gasification device, and the gasified ammonia passes through the ammonia pipeline 1 and the heat exchanger unit 3 and is preheated before entering the raw material mixing tank 4; the n-octanol pipeline 3 is equipped with a delivery pump 8, and the delivery pump 8 delivers the n-octanol liquid into the heat exchanger unit 3 and then enters the raw material mixing tank 4 after the waste heat. The raw material mixing tank 4 is equipped with a heat exchange coil, and circulating hot oil is passed through the heat exchange coil. The mixed raw materials in the raw material mixing tank 4 are gasified to form a mixed gas and enter from the top of the fixed bed reactor 5 through a pipeline.
[0022] The bottom of the fixed bed reactor 5 is connected to an activation gas pipeline 9, which extends from the bottom of the fixed bed reactor 5 to the reaction bed inside. The activation gas is introduced into the catalyst in the fixed bed through the activation gas pipeline to activate the catalyst, thereby improving the selectivity of the catalyst. The raw mixed gas undergoes a catalytic reaction in the fixed bed reactor 5 to generate n-octylamine, and the n-octylamine gas and the incompletely reacted raw gas are sent from the bottom of the fixed bed reactor 5 to the heat exchanger unit 3 through a pipeline.
[0023] The heat exchanger unit 3 is composed of three heat exchangers, all of which are shell and tube heat exchangers. The tube side of the first heat exchanger 31 is connected in series between the n-octanol pipeline and the raw material mixing tank, the tube side of the second heat exchanger 32 is connected in series between the ammonia pipeline and the raw material mixing tank, and the tube side of the third heat exchanger 33 is connected with circulating cooling water. The shell side of the first heat exchanger 31 is connected to the raw material outlet of the fixed bed reactor through a pipeline; the shell side of the first heat exchanger 31 is connected to the shell side of the second heat exchanger 32, the shell side of the second heat exchanger 32 is connected to the shell side of the third heat exchanger 33, and the shell side of the third heat exchanger 33 is connected to the shell side of the third heat exchanger 33. The shell side of the first heat exchanger 31 is connected to the top of the shell side of the second heat exchanger 32 at the higher end through a pipeline, and the shell side of the second heat exchanger 32 is connected to the top of the shell side of the third heat exchanger 33 at the higher end through a pipeline, and the shell side of the third heat exchanger 33 at the lower end is connected to the finished product tank 6 through a pipeline.
[0024] After the mixed gas of finished product and raw material is heat exchanged in the heat exchanger unit 3, the finished product and water are condensed into liquid and collected in the finished product tank 6. The bottom of the finished product tank 6 is connected to a finished product output pipeline, which is connected to the distillation station. A venting branch 10 is installed on the top of the finished product tank 6, and a control valve is installed on the venting branch 10. The uncondensed raw material gas is connected to the ammonia collection device 7 from the top of the finished product tank 6 through a pipeline.
[0025] The ammonia collection device 7 is composed of two ammonia inlet buffer tanks 71 arranged in series, a compressor 72, and two ammonia outlet buffer tanks 73 arranged in series. The raw gas in the finished product tank 6 enters the ammonia inlet buffer tank 71 through a pipeline, and the ammonia and other gases collected in the ammonia inlet buffer tank 71 enter the air intake of the compressor 72 through a pipeline. The compressor 72 compresses the gas and sends it into the ammonia outlet buffer tank 73 through a pipeline. The top of the ammonia outlet buffer tank 73 is connected to the raw material mixing tank 4 through a pipeline to continue to participate in the reaction to avoid the waste of raw materials. A connecting pipeline is installed between the first ammonia inlet buffer tank and the second ammonia outlet buffer tank, and a control valve is installed on the connecting pipeline for pressure regulation in the pipeline.
Claims
1. A system for producing n-octylamine by high-selectivity catalysis, comprising a fixed bed reactor, a catalyst is contained in the fixed bed reactor, a raw material inlet is provided at the top of the fixed bed reactor, a raw material outlet is provided at the bottom of the fixed bed reactor, the raw material inlet of the fixed bed reactor is connected to the bottom of a raw material mixing tank through a pipeline, an ammonia inlet is provided at the top of the raw material mixing tank, the ammonia inlet is connected to an ammonia pipeline, an n-octanol inlet is provided in the middle of the raw material mixing tank, and the n-octanol inlet is connected to the n-octanol pipeline; characterized in that The ammonia pipeline and the n-octanol pipeline are respectively connected to the heat exchanger unit, and the heat exchanger unit includes three heat exchangers, all of which are shell and tube heat exchangers; the tube side of the first heat exchanger is connected in series between the n-octanol pipeline and the n-octanol inlet of the raw material mixing tank, the tube side of the second heat exchanger is connected in series between the ammonia pipeline and the ammonia inlet of the raw material mixing tank, and circulating cooling water is passed through the tube side of the third heat exchanger. The shell side of the first heat exchanger is connected to the shell side of the second heat exchanger, the shell side of the second heat exchanger is connected to the shell side of the third heat exchanger, and the shell side of the third heat exchanger is connected to the finished product tank through a pipeline; the top of the finished product tank is connected to an ammonia collecting device through a pipeline, and the ammonia collecting device is connected to the middle of the raw material mixing tank through a pipeline.
2. The system for producing n-octylamine by high selectivity catalysis according to claim 1, characterized in that: The ammonia collection device includes an ammonia inlet buffer tank, a compressor and an ammonia outlet buffer tank. The middle part of the ammonia inlet buffer tank is connected to the top of the finished product tank through a pipeline, the top of the ammonia inlet buffer tank is connected to the air intake of the compressor through a pipeline, the air outlet of the compressor is connected to the middle part of the ammonia outlet buffer tank through a pipeline, and the top of the ammonia outlet buffer tank is connected to the middle part of the raw material mixing tank through a pipeline.
3. The system for producing n-octylamine by high selectivity catalysis according to claim 2, characterized in that: It comprises two ammonia gas inlet buffer tanks and two ammonia gas outlet buffer tanks arranged in series. A connecting pipe is installed between the first ammonia gas inlet buffer tank and the second ammonia gas outlet buffer tank, and a control valve is installed on the connecting pipe.
4. The system for producing n-octylamine by high selectivity catalysis according to claim 1, characterized in that: The bottom of the fixed bed reactor is connected with an activated gas pipeline, and the activated gas pipeline extends from the bottom of the fixed bed reactor to the reaction bed inside.
5. The system for producing n-octylamine by high selectivity catalysis according to claim 1, characterized in that: The bottom of the finished product tank is connected with a finished product output pipeline, and the finished product output pipeline is connected to the distillation station.
6. The system for producing n-octylamine by high-selectivity catalysis according to claim 5, characterized in that: A venting branch is installed on the top of the finished product tank, and a control valve is installed on the venting branch.
7. The system for producing n-octylamine by high selectivity catalysis according to claim 1, characterized in that: The three heat exchangers are distributed from top to bottom, each heat exchanger is tilted, and the tilt directions of adjacent heat exchangers are different; the bottom of the shell side of the lower end of the first heat exchanger is connected to the top of the shell side of the higher end of the second heat exchanger through a pipeline, the bottom of the shell side of the lower end of the second heat exchanger is connected to the top of the shell side of the higher end of the third heat exchanger through a pipeline, and the shell side of the lower end of the third heat exchanger is connected to the finished product tank through a pipeline.
8. The system for producing n-octylamine by high selectivity catalysis according to claim 1, characterized in that: A delivery pump is installed on the n-octanol pipeline, and the ammonia pipeline is connected to an ammonia gasification device.
9. The system for producing n-octylamine by high selectivity catalysis according to claim 1, characterized in that: A heat exchange coil is installed in the raw material mixing tank, and circulating hot oil is passed through the heat exchange coil.