Formic acid concentration system utilizing multi-stage heat source

Abstract

The utility model relates to the field of chemical engineering devices, and provides a formic acid concentration system utilizing a multi-stage heat source, which comprises a separating tower, an evaporator, a concentration tower and a storage tank which are sequentially communicated, a formic acid feeding pipe of the separating tower is provided with a tower-front heat exchanger for increasing the temperature of formic acid, and the separating tower is provided with a reboiler for providing heat. The formic acid concentration system is provided with a hot water tank which is communicated with a tower-front heat exchanger, a reboiler and an evaporator, and hot water condensate of the reboiler and the evaporator is collected and introduced into the tower-front heat exchanger to exchange heat by utilizing waste heat of the hot water condensate. The multi-stage heat energy utilization device has the beneficial effects that the required primary steam quantity is greatly reduced through multi-stage utilization of heat energy. By means of the optimization, production efficiency is improved, and energy consumption is remarkably reduced. Specifically, the steam consumption can be reduced to 600 kilograms at most when one ton of formic acid product is produced, which is undoubtedly a huge energy conservation for long-term and large-scale production.

Description

Technical Field

[0001] The utility model relates to the field of chemical industry, in particular to a formic acid concentration system utilizing multi-stage heat sources. Background Art

[0002] In the current chemical production process, formic acid, as an important organic chemical raw material, is widely used in many industries such as pesticides, medicine, and leather. However, the initial concentration of formic acid after carbonyl synthesis is often at a low level of 15% to 35%, which is far from meeting the requirements of downstream products for high purity formic acid (85% to 99%). Therefore, separation and concentration of formic acid after carbonyl synthesis has become a necessary production link.

[0003] Although there are many formic acid concentration processes on the market, these processes are relatively mature, but they generally have problems such as long processes and high energy consumption. More importantly, the equipment used in these processes is mostly made of rare metal materials such as titanium and zirconium. These materials are not only expensive, but also difficult to process, resulting in high equipment costs. This not only increases the investment cost of formic acid production, but also in the actual production process, due to the high equipment cost, it will also bring higher maintenance costs and operational risks.

[0004] What is more serious is that due to the high energy consumption of the existing formic acid concentration process, a large amount of heat energy is wasted in the production process, which not only causes a huge loss of energy, but also further increases the production cost of formic acid. How to reduce the energy consumption in the formic acid concentration process and improve the efficiency of heat energy utilization has become an urgent problem to be solved. Utility Model Content

[0005] Aiming at the deficiencies of the prior art, the present invention solves the problem that a large amount of heat energy is wasted in the production process due to the high energy consumption characteristics of the existing formic acid concentration process.

[0006] The utility model provides a formic acid concentration system utilizing a multi-stage heat source, comprising a separation tower, an evaporator, a concentration tower and a storage tank which are connected in sequence, a formic acid feed pipe of the separation tower is provided with a front-tower heat exchanger for increasing the temperature of formic acid, a reboiler is provided in the separation tower to provide heat, a hot water tank is provided in the formic acid concentration system to connect the front-tower heat exchanger, the reboiler and the evaporator, hot water condensate collected from the reboiler and the evaporator is passed into the front-tower heat exchanger to utilize the waste heat of the hot water condensate for heat exchange.

[0007] Furthermore, the evaporator is provided with a circulation pipeline and a first circulation pump for circulation evaporation.

[0008] Furthermore, the concentration tower is provided with a circulation pipeline and a second circulation pump for circulation concentration.

[0009] Furthermore, the concentration tower is provided with a reflux pipeline connected to the evaporator to transport formic acid vapor.

[0010] As a preferred solution, the return pipe is provided with a compressor driven by a motor to improve the return efficiency.

[0011] As a preferred solution, the upper diameter of the separation tower body is larger than the lower diameter, and the interior is a ceramic perforated plate corrugated packing.

[0012] As a preferred solution, the interior of the concentration tower is filled with titanium perforated plate corrugated packing.

[0013] The beneficial effects of the utility model are:

[0014] 1. The utility model greatly reduces the amount of primary steam required by the multi-stage utilization of thermal energy. This optimization not only improves production efficiency, but also significantly reduces energy consumption. Specifically, for every ton of formic acid product produced, the steam consumption can be reduced by up to 600 kilograms, which is undoubtedly a huge energy saving for long-term, large-scale production.

[0015] 2. The utility model takes full account of the continuity and efficiency of the production process. Its design is exquisite and the process is compact, ensuring the optimal energy utilization in the production process. This efficient energy utilization is not only reflected in reducing steam consumption, but also runs through the entire production process. In addition, the device also shows a strong energy-saving effect, which is of great significance for reducing production costs and improving economic benefits. At the same time, due to its easy operation and maintenance, as well as excellent scalability, the device is very suitable for large-scale production, further improving its market competitiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to make the content of the utility model easier to understand, the utility model is further described in detail according to specific embodiments and in conjunction with the accompanying drawings.

[0017] Figure 1 It is a structural schematic diagram of the utility model.

[0018] The reference numerals in the accompanying drawings are:

[0019] 1. Heat exchanger before the tower, 2. Separation tower, 3. Reboiler, 4. Evaporator, 5. First circulation pump, 6. Hot water tank, 7. Motor, 8. Compressor, 9. Concentration tower, 10. Second circulation pump, 11. Storage tank. DETAILED DESCRIPTION

[0020] To illustrate the features of the present invention, the present invention is further described below with reference to the accompanying drawings and embodiments.

[0021] Example:

[0022] See also Figure 1The present embodiment provides a formic acid concentration system utilizing a multi-stage heat source, comprising a separation tower 2, an evaporator 4, a concentration tower 9 and a storage tank 11 connected in sequence, the formic acid feed pipe of the separation tower 2 is provided with a front-tower heat exchanger 1 for increasing the temperature of formic acid, the separation tower 2 is provided with a reboiler 3 to provide heat, the formic acid concentration system is provided with a hot water tank 6 connecting the front-tower heat exchanger 1, the reboiler 3 and the evaporator 4, and the hot water condensate from the reboiler 3 and the evaporator 4 is collected and passed into the front-tower heat exchanger 1 for heat exchange using the waste heat of the hot water condensate.

[0023] In order to improve the technical effect of the evaporator 4 and the concentration tower 9, the evaporator 4 is provided with a circulation pipeline and a first circulation pump 5 for circulation evaporation in the evaporator 4 in this embodiment; and a circulation pipeline and a second circulation pump 10 for circulation concentration are provided in the concentration tower 9. In addition, a reflux pipeline is provided in the concentration tower 9 to communicate with the evaporator 4 to transport formic acid vapor, thereby improving the utilization efficiency of formic acid.

[0024] In addition, this embodiment has also been improved in applicability, and a compressor 8 driven by a motor 7 is arranged in the reflux pipeline to improve the reflux efficiency. The separation tower 2 adopts a tower body with an upper diameter larger than a lower diameter, and a ceramic orifice plate corrugated packing is arranged inside; the concentration tower 9 is arranged with a titanium orifice plate corrugated packing inside.

[0025] The above embodiments and drawings are only used to illustrate the technical solution of the utility model, and are not intended to limit the utility model. The utility model is described in detail with reference to the preferred embodiments. It should be understood by ordinary technicians in this field that the changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the utility model do not deviate from the purpose of the utility model and should also fall within the scope of protection of the claims of the utility model. Other related technical structures not fully disclosed in the utility model are prior art in the field.

Claims

1. A formic acid concentration system utilizing a multi-stage heat source, comprising a separation tower (2), an evaporator (4), a concentration tower (9) and a storage tank (11) connected in sequence, wherein a formic acid feed pipe of the separation tower (2) is provided with a pre-tower heat exchanger (1) for increasing the temperature of the formic acid, characterized in that: The separation tower (2) is provided with a reboiler (3) to provide heat, and the formic acid concentration system is provided with a hot water tank (6) connected to the pre-tower heat exchanger (1), the reboiler (3) and the evaporator (4), and hot water condensate from the reboiler (3) and the evaporator (4) is collected and passed into the pre-tower heat exchanger (1) to utilize the waste heat of the hot water condensate for heat exchange.

2. The formic acid concentration system using multi-stage heat sources according to claim 1, characterized in that: The evaporator (4) is provided with a circulation pipeline and a first circulation pump (5) for circulation evaporation.

3. The formic acid concentration system using multi-stage heat sources according to claim 1, characterized in that: The concentration tower (9) is provided with a circulation pipeline and a second circulation pump (10) for circulation concentration.

4. The formic acid concentration system using multi-stage heat sources according to claim 1, characterized in that: The concentration tower (9) is provided with a reflux pipe connected to the evaporator (4) to transport formic acid vapor.

5. The formic acid concentration system using multi-stage heat sources according to claim 4, characterized in that: The return pipe is provided with a compressor (8) driven by a motor (7) to improve the return efficiency.

6. The formic acid concentration system using multi-stage heat sources according to claim 1, characterized in that: The separation tower (2) has an upper diameter greater than a lower diameter, and has a ceramic perforated plate corrugated packing inside.

7. The formic acid concentration system using multi-stage heat sources according to claim 1, characterized in that: The interior of the concentration tower (9) is filled with titanium perforated plate corrugated packing.

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