Carbonyl synthesis system capable of recycling tail gas

Abstract

The utility model relates to the field of chemical equipment, and provides a carbonyl synthesis system capable of recycling tail gas, which comprises a carbonyl reactor and a tail gas recycling system, an exhaust pipeline and an input pipeline of the tail gas recycling system are respectively communicated with an inlet pipeline and a circulating pipeline of the carbonyl reactor, and the carbonyl reactor is also provided with an outlet pipeline; the exhaust pipeline is further provided with a tail gas pipeline communicated with the outlet pipeline. The two-stage shunting device has the beneficial effects that the content of the tail gas is controlled within a reasonable range through the two-stage shunting arrangement, so that the content of the tail gas is always kept within the reasonable range, and the content of the tail gas is not too high or too low. On the premise of ensuring cyclic utilization of the tail gas, the utilization efficiency of the feed gas is improved, so that the carbonyl reaction efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of chemical equipment, in particular to a carbonyl synthesis system for recycling tail gas. Background Art

[0002] In the formic acid production process, the tail gas from the methyl formate distillation tower is an important link. After being compressed by the four-stage compressor, the tail gas is sent back to the carbonyl synthesis system and used as a raw material for further reaction.

[0003] However, this part of tail gas contains a lot of impurities, which may affect the reaction efficiency of carbonyl synthesis. Specifically, the impurities may react with the carbonyl group unnecessarily, consume part of the carbonyl group, and thus reduce the reaction efficiency of the carbonyl group.

[0004] This reduction in efficiency further affects the production efficiency of methyl formate in the carbonyl system. Because the production of methyl formate depends on the reaction of the carbonyl group, the reduction in the efficiency of the carbonyl reaction directly leads to a reduction in the production efficiency of methyl formate.

[0005] Ultimately, this reduction in efficiency will have an impact on the overall formic acid production output. Specifically, the reduced efficiency of methyl formate production means that the amount of methyl formate produced per unit time is reduced, resulting in a reduction in the total formic acid production.

[0006] Therefore, in order to increase the production of formic acid, we need to find ways to improve the reaction efficiency of carbonyl synthesis while ensuring the recycling of tail gas, thereby improving the production efficiency of methyl formate. This may require improving the existing production process or developing new technologies to solve this problem. This is an issue worthy of further research and discussion. Utility Model Content

[0007] Aiming at the shortcomings of the existing technology, the problem of low reaction efficiency of carbonyl synthesis is solved under the premise of ensuring the recycling of tail gas;

[0008] The utility model provides a carbonyl synthesis system for recycling tail gas, comprising a carbonyl reactor and a tail gas recycling system;

[0009] The exhaust pipe and the input pipe of the tail gas recycling system are respectively connected to the inlet pipe and the circulation pipe of the carbonyl reactor, and the carbonyl reactor is also provided with an outlet pipe;

[0010] The exhaust pipeline is also provided with an exhaust pipeline connected to the outlet pipeline.

[0011] Furthermore, the tail gas recycling system includes an expansion tank, a distillation tower, a cooler and a compressor which are connected in sequence.

[0012] Furthermore, the exhaust gas pipeline is provided with a control valve.

[0013] Furthermore, a buffer tank is provided between the carbonyl reactor and the tail gas recycling system.

[0014] Furthermore, the outlet pipe is provided with a condenser.

[0015] As a preferred solution, the condenser is provided with a reflux pipeline for recycling the cooling liquid and connected to the carbonyl reactor.

[0016] The beneficial effects of the utility model are:

[0017] 1. The tail gas recycling system of the carbonyl reactor of the utility model controls the tail gas content within a reasonable range through a two-stage split flow setting. This setting ensures that the tail gas content is always kept within a reasonable range, neither too high nor too low. Under the premise of ensuring the recycling of tail gas, the utilization efficiency of the raw gas is improved, thereby improving the efficiency of the carbonyl reaction.

[0018] 2. The utility model helps to reduce costs. By improving the utilization efficiency of raw gas and the efficiency of carbonyl reaction, we can reduce the amount of raw gas required, thereby reducing costs. This is very attractive to any enterprise that hopes to improve efficiency and reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to make the content of the utility model easier to understand, the utility model is further described in detail below according to specific embodiments and in combination with the accompanying drawings.

[0020] Figure 1 It is a schematic diagram of the structural arrangement of the utility model.

[0021] The reference numerals in the accompanying drawings are:

[0022] 1. Carbonyl reactor; 11. Inlet pipeline; 12. Circulation pipeline; 13. Outlet pipeline; 2. Condenser; 21. Reflux pipeline; 3. Compressor; 4. Buffer tank; 5. Tail gas pipeline; 51. Control valve; 6. Distillation tower; 7. Expansion tank; 8. Cooler. DETAILED DESCRIPTION

[0023] To illustrate the features of the present invention, the present invention is further described below with reference to the accompanying drawings and embodiments.

[0024] Example:

[0025] refer to Figure 1This embodiment provides a carbonyl synthesis system for recycling tail gas, including a carbonyl reactor and a tail gas recycling system, wherein the carbonyl reactor is a special reactor for carbonyl synthesis made of stainless steel, and low-temperature circulating water is used to provide cooling for the carbonyl synthesis tail gas, and the high-temperature tail gas is condensed and recovered; the tail gas recycling system includes an expansion tank, a distillation tower, a cooler and a compressor connected in sequence, wherein the compressor 3 is a reciprocating compressor made of carbon steel, which sends the distilled tail gas to the carbonyl reactor and recycles the methyl formate therein.

[0026] The exhaust pipe and the input pipe of the exhaust gas recycling system are respectively connected to the inlet pipe and the circulation pipe of the carbonyl reactor to realize the recycling of the exhaust gas of the carbonyl reactor; in addition, the carbonyl reactor is also provided with an outlet pipe, and the outlet pipe is provided with a condenser, so that the exhaust gas discharged after utilization can be cooled before being discharged, so as to avoid the exhaust gas from polluting the air. In this embodiment, a reflux pipe for recycling the coolant is also provided in the condenser to connect to the carbonyl reactor to recycle the coolant.

[0027] The exhaust pipe is also provided with an exhaust gas pipe connected to the outlet pipe, and a control valve is provided in the exhaust gas pipe to control the proportion of the diverted exhaust gas. The control personnel can control the proportion of the diverted exhaust gas according to actual conditions. In addition, this embodiment also provides a buffer tank between the carbonyl reactor and the exhaust gas recycling system to buffer the operation of the system and ensure that the system can run smoothly.

[0028] 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 carbonyl synthesis system for recycling tail gas, comprising a carbonyl reactor (1) and a tail gas recycling system, Features: The exhaust pipe and the input pipe of the tail gas recycling system are respectively connected to the inlet pipe (11) and the circulation pipe (12) of the carbonyl reactor (1), and the carbonyl reactor (1) is also provided with an outlet pipe (13); The exhaust pipeline is also provided with an exhaust gas pipeline (5) connected to the outlet pipeline (13).

2. The carbonyl synthesis system for recycling tail gas according to claim 1, Features: The tail gas recycling system comprises an expansion tank (7), a distillation tower (6), a cooler (8) and a compressor (3) which are connected in sequence.

3. The carbonyl synthesis system for recycling tail gas according to claim 1, Features: The exhaust gas pipeline (5) is provided with a control valve (51).

4. The carbonyl synthesis system for recycling tail gas according to claim 1, Features: A buffer tank (4) is provided between the carbonyl reactor (1) and the tail gas recycling system.

5. The carbonyl synthesis system for recycling tail gas according to claim 1, Features: The outlet pipe (13) is provided with a condenser (2).

6. The carbonyl synthesis system for recycling tail gas according to claim 5, Features: The condenser (2) is provided with a reflux pipeline (21) for recycling the cooling liquid and is connected to the carbonyl reactor (1).

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