Non-stop sampler in negative pressure rectification process
By designing a stainless steel sample collection vessel and applying the principle of liquid static pressure flow, non-stop sampling during negative pressure distillation was achieved, solving the safety risks and high costs associated with sampling during shutdown in existing technologies, and improving production efficiency and ease of operation.
Patent Information
- Application Number
- CN202520141786.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-21
- Publication Date
- 2026-02-03
- Estimated Expiration
- 2035-01-21
AI Technical Summary
In negative pressure distillation, existing technologies require shutdown for sampling, which leads to high process safety risks and production costs, and also affects production efficiency.
A stainless steel sample collection vessel was designed. By utilizing the principle of liquid hydrostatic flow and employing a vacuum valve, a venting valve, and a sample interception valve, sampling can be achieved without shutting down the system. Multiple openings are provided at the top and bottom of the sample collection vessel to connect the distillate pipeline and the sample transfer valve, enabling rapid sampling and sample transfer.
It enables sampling without stopping the machine, avoids process safety risks, improves production efficiency and reduces production costs, and is simple and convenient to operate.
Smart Images
Figure CN223870344U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of quality control equipment and non-stop sampling technology in chemical processes, and specifically to a non-stop sampler in a negative pressure distillation process. Background Technology
[0002] Chemical processes often involve negative pressure distillation, a process and equipment used to control product quality and purity. During negative pressure distillation, samples of the distillate are periodically taken and sent for testing. The results of these quality tests determine whether or not qualified products are collected; untimely testing or inaccurate sampling directly impacts the amount of qualified products collected and production costs. Therefore, to maximize the collection of qualified products, the frequency of central control sampling during the distillation process is increased.
[0003] In existing technologies, because the entire negative pressure distillation process is under negative pressure, the system must be shut down to obtain distillate samples during central control sampling. Restarting the system after shutdown easily leads to phenomena detrimental to process safety, such as flooding and gas-liquid entrainment, and restoring the system to equilibrium takes at least 10-15 minutes. Therefore, shutdown sampling is costly and also detrimental to process safety. Summary of the Invention
[0004] To address the above problems, this utility model discloses a non-stop sampler for negative pressure distillation. It utilizes the mechanical principle of liquid hydrostatic flow to design a sample collection tank connected to a vacuum valve, a vent valve, and a sample interception valve. The distillate from the negative pressure distillation process is intercepted and transferred to the sample collection tank, successfully solving the problems of non-stop sampling and timely and accurate sampling during negative pressure distillation. It also features simple structure, convenient operation, and good application effect.
[0005] The present invention relates to a non-stop sampler for a negative pressure distillation process, comprising: a distillate pipeline, a sample interception valve, a sample collection tank, a vacuum valve, a vent valve, a sampling port, a sample transfer valve, a mixed sample storage tank, and a mixed sample vent valve. The sample collection tank has three openings at its top: one opening is connected to the distillate pipeline via the sample interception valve, and the other two openings are connected to the vacuum valve and the vent valve, respectively. The sample collection tank has two openings at its lower part, with a sampling port located on the lower side. The sample transfer valve is connected directly below the sample collection tank, which is then connected downwards to the mixed sample storage tank. The mixed sample storage tank is connected directly below the mixed sample vent valve.
[0006] Preferably, the non-stop sampler in the negative pressure distillation process described in this utility model is characterized in that the sample collection tank is made of stainless steel, with a semi-circular or conical bottom and top, and a capacity of 0.01–0.02 m³. 3 .
[0007] Preferably, the non-stop sampler in the negative pressure distillation process described in this utility model is characterized in that the mixed sample storage tank is made of stainless steel, with a semi-circular or conical bottom and top, and a capacity of 0.02–0.03 m³. 3 .
[0008] Preferably, the non-stop sampler in the negative pressure distillation process described in this utility model is characterized in that the short tube connecting the sample interception valve and the distillate pipeline extends and inserts into the distillate pipeline by 1-2 cm.
[0009] The non-stop sampling device in the negative pressure distillation process described in this utility model has the following significant benefits: (1) Non-stop sampling effectively avoids the process safety risks caused by frequent shutdown and restart, which is more beneficial to chemical safety production; (2) Non-stop sampling can be used to take samples and detect at any time without affecting the normal operation of negative pressure distillation, which is more beneficial to the control of production efficiency and production cost; (3) It also has the advantages of simple structure, convenient operation and good application effect. Attached Figure Description
[0010] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, 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.
[0011] Figure 1 This is a schematic diagram of the planar structure of a non-stop sampler in a negative pressure distillation process, as described in the technical solution of this utility model.
[0012] Figure 1 In the middle: Distillate pipeline 53, non-stop sampler 09, sample interception valve 10, sample collection tank 91, vacuum valve 92, vent valve 93, sampling port 94, sample transfer valve 95, mixed sample temporary storage tank 96, mixed sample vent valve 97.
[0013] Figure 2 This is a schematic diagram showing the installation position of a non-stop sampler in a negative pressure distillation process, as described in the technical solution of this utility model.
[0014] Figure 2In the middle section: Distillation kettle 01, reboiler 02, crude product inlet 03, distillation column 04, condenser assembly 05, distillate pipeline 53, fore-distillate control valve 06, fore-distillate vacuum port 07, fore-distillate collection tank 08, non-stop sampler 09, sample cut-off valve 10, qualified product control valve 11, qualified product tank vacuum port 12, qualified product receiving tank 13.
[0015] To make the objectives, technical solutions, and advantages of this utility model clearer, the following description is provided in conjunction with... Figure 1 The specific embodiments of this implementation will be further described.
[0016] The present embodiment describes a non-stop sampler in a negative pressure distillation process, which includes: a distillate pipeline 53, a non-stop sampler 09, a sample interception valve 10, a sample collection tank 91, a vacuum valve 92, a vent valve 93, a sampling port 94, a sample transfer valve 95, a mixed sample storage tank 96, and a mixed sample vent valve 97.
[0017] Furthermore, the non-stop sampler in the negative pressure distillation process described in this specific embodiment is characterized in that the sample collection tank 91 has three openings at the top, one opening is connected to the distillate pipeline 53 through the sample interception valve 10, and the other two openings are connected to the vacuum valve 92 and the vent valve 93 respectively. The sample collection tank 91 has two openings at the bottom, and a sampling port 94 is provided on the lower side. A sample transfer valve 95 is connected directly below it. The sample transfer valve 95 is connected downward to the mixed sample storage tank 96, and a mixed sample vent valve 97 is connected directly below the mixed sample storage tank 96.
[0018] Furthermore, the non-stop sampler in the negative pressure distillation process described in this specific embodiment is characterized in that the sample collection tank is made of stainless steel, with a semi-circular or conical bottom and top, and a capacity of 0.01–0.02 m³. 3 .
[0019] Furthermore, the non-stop sampler in the negative pressure distillation process described in this specific embodiment is characterized in that the mixed sample storage tank is made of stainless steel, with a semi-circular or conical bottom and top, and a capacity of 0.02–0.03 m³. 3 .
[0020] Furthermore, in this specific embodiment, the non-stop sampler in a negative pressure distillation process is characterized in that the short tube connecting the sample interception valve and the distillate pipeline extends and inserts 1-2 cm into the distillate pipeline. This design aims to allow the distillate to flow rapidly into the sample collection tank.
[0021] Furthermore, the non-stop sampler in the negative pressure distillation process described in this specific embodiment has the following simple operation process: First, open the vacuum valve 92 connected to the top of the sample collection tank 91, and then open the sample interception valve 10, so that the distillate flows quickly from the distillate pipe 53 into the sample collection tank 91; close the vacuum valve 92, open the vent valve 93 at the top of the sample collection tank 91, and then release a sufficient amount of sample for testing at the sampling port 94; next, open the sample transfer valve 95 to transfer the remaining distillate in the sample collection tank 91 to the mixed sample temporary storage tank 96. After one cycle of negative pressure distillation is completed, open the mixed sample vent valve 97 to allow all the mixed sample to flow into the fore-distillate collection tank 08, and then re-distill for the next negative pressure distillation cycle.
[0022] Such a device, a non-stop sampler in the negative pressure distillation process described in this utility model, has three obvious beneficial effects: (1) non-stop sampling effectively avoids the process safety risks caused by frequent shutdown and startup, which is more beneficial to chemical safety production; (2) non-stop sampling can be used to sample and test at any time without affecting the normal operation of negative pressure distillation, which is more beneficial to the control of production efficiency and production cost; (3) it also has the advantages of simple structure, convenient operation and good application effect.
[0023] Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model shall be included within the protection scope of this utility model. The protection scope of this utility model shall conform to the widest range consistent with the principles and novel features described herein.
Claims
1. A non-stop sampler for a negative pressure distillation process, comprising: The sample collection tank comprises a distillate pipeline, a sample interception valve, a sample collection tank, a vacuum valve, a vent valve, a sampling port, a sample transfer valve, a mixed sample storage tank, and a mixed sample vent valve. The sample collection tank has three openings at its top: one opening is connected to the distillate pipeline via the sample interception valve, and the other two openings are connected to the vacuum valve and the vent valve, respectively. The sample collection tank also has two openings at its lower part, with a sampling port located on the lower side. A sample transfer valve is connected directly below the sample collection tank, which is then connected downwards to the mixed sample storage tank. The mixed sample storage tank is connected directly below the mixed sample vent valve.
2. The non-stop sampler in a negative pressure distillation process according to claim 1, characterized in that, The sample collection container is made of stainless steel, with a semi-circular or conical bottom and top, and a capacity of 0.01–0.02 m³. 3 .
3. The non-stop sampler in a negative pressure distillation process according to claim 1, characterized in that, The mixed sample storage container is made of stainless steel, with a semi-circular or conical bottom and top, and a capacity of 0.02–0.03 m³. 3 .
4. A non-stop sampler in a negative pressure distillation process according to claim 1, characterized in that, The short tube connecting the sample interception valve and the distillate pipeline extends and inserts into the distillate pipeline by 1-2 cm.