L-p-hydroxyphenylglycine methyl ester drying tail gas recovery device
By adding an airflow reducer, a gas-liquid separator, and a liquid-phobic layer to the exhaust gas treatment system of the airflow dryer, the problem of methanol recovery was solved, achieving efficient recovery and safe reduction of methanol, and simplifying the operation process.
Patent Information
- Application Number
- CN202520177212.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-03
- Publication Date
- 2026-01-06
- Estimated Expiration
- 2035-02-03
AI Technical Summary
Existing technologies are insufficient to effectively recover methanol from the exhaust gas of airflow dryers. Traditional methods involve large investments, require significant space, have high recovery costs, and pose safety risks.
The design incorporates an airflow reducer, a gas-liquid separator, and a condenser layer. A large-diameter airflow reducer is used to lower the airflow velocity, which is then combined with a spiral plate or tubular condenser for rapid condensation. The gas-liquid separator and condenser layer ensure effective methanol recovery.
This method achieves efficient methanol recovery, reduces safety risks, simplifies post-processing procedures, improves recovery rate, and reduces economic costs.
Smart Images
Figure CN223760446U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of chemical production equipment and tail gas recovery and environmental protection technology, and specifically relates to a tail gas recovery device for drying L-hydroxyphenylglycine methyl ester. Background Technology
[0002] L-hydroxyphenylglycine methyl ester is an important pharmaceutical and chemical intermediate, mainly used to prepare the side chains of semi-synthetic penicillins and cephalosporin drugs, such as amoxicillin, amoxicillin, and cefadroxil.
[0003] The production process of L-p-hydroxyphenylglycine methyl ester involves drying the wet product using an airflow dryer. Because the wet product contains a certain proportion of methanol, the treatment of the drying exhaust gas is extremely important. If this methanol-containing exhaust gas is not recovered in a timely manner, it will cause problems for the waste gas treatment of subsequent processes, resulting in significant economic losses and hindering production cost control.
[0004] Because the exhaust gas velocity of the airflow dryer is too high, traditional condensation recovery methods cannot effectively recover methanol from the exhaust gas. Water absorption, membrane treatment, and adsorption recovery methods are also feasible, but their high investment costs, large space requirements, and high recovery costs prevent their widespread adoption. Summary of the Invention
[0005] To address the aforementioned problems, this utility model discloses a tail gas recovery device for L-para-hydroxyphenylglycine methyl ester drying. Its main innovations include the addition of an airflow decelerator, a gas-liquid separator, and the design and introduction of a liquefying layer. This L-para-hydroxyphenylglycine methyl ester drying tail gas recovery device effectively solves the problem of difficult tail gas recovery from airflow dryers, avoiding the safety risks associated with the transfer of tail gas containing large amounts of methanol to downstream processes. It also features a simple structure, convenient operation, and good methanol recovery efficiency.
[0006] This utility model discloses a device for recovering the tail gas from the drying of L-hydroxyphenylglycine methyl ester. It includes: a dryer tail gas interface, an airflow inlet A, an airflow reducer, an airflow outlet B, an airflow outlet C, a built-in condenser, condenser A, condenser B, a cooling water inlet, a cooling water outlet, a gas-liquid separator, a residual gas outlet, a condenser-recovery layer, a methanol recovery storage tank, and a vent. The device is characterized in that the airflow reducer has an airflow inlet A at its top, which is connected to the dryer tail gas interface via a pipe. The airflow reducer houses a built-in condenser and has airflow outlets B and C on its sides. Airflow outlet B connects to condenser B, and airflow outlet C connects to condenser C. The bottom of the airflow reducer is connected to the gas-liquid separator via a pipe. The bottoms of condenser B and condenser C are connected to the gas-liquid separator via pipes. The bottom of the gas-liquid separator is connected to the methanol recovery storage tank. A condenser-recovery layer is installed between the gas-liquid separator and the methanol recovery storage tank. A residual gas outlet is located on one side of the upper part of the gas-liquid separator.
[0007] Preferably, the L-hydroxyphenylglycine methyl ester drying tail gas recovery device described in this utility model is characterized in that the airflow reducer is a cylindrical tube sealed at both ends, welded from rigid PP sheet material. The diameter of the airflow reducer is 200-250 cm, and the height is 250-300 cm. The diameter of the airflow reducer designed in this utility model is 6-10 times that of the tail gas pipe. After the high-speed airflow enters the airflow reducer, the flow velocity is quickly reduced, which is very beneficial for cooling and condensation.
[0008] Preferably, the L-hydroxyphenylglycine methyl ester drying tail gas recovery device described in this utility model is characterized in that the condenser B is a spiral plate condenser, a shell-and-tube condenser, or a serpentine tube condenser, with a heat exchange area of 100-120 m². 2 The purpose of setting a large heat exchange area in the condenser is to rapidly condense the exhaust gas containing methanol.
[0009] Preferably, the L-hydroxyphenylglycine methyl ester drying tail gas recovery device described in this utility model is characterized in that the condenser C is a spiral plate condenser, a shell-and-tube condenser, or a serpentine tube condenser, with a heat exchange area of 100-120 m². 2 The purpose of setting the condenser to have a large heat exchange area is to rapidly condense the exhaust gas containing methanol.
[0010] Preferably, the L-hydroxyphenylglycine methyl ester drying tail gas recovery device described in this utility model is characterized in that the gas-liquid separator is welded from rigid PP sheet, with a sealed cylinder at the top and a conical or elliptical bottom. The purpose of designing the bottom of the gas-liquid separator as conical or elliptical is to allow the condensed recovered methanol to flow quickly to the recovered methanol storage tank, preventing a portion from being carried away by the airflow.
[0011] Preferably, the L-para-hydroxyphenylglycine methyl ester drying tail gas recovery device described in this utility model is characterized in that the liquefaction layer is composed of 6-8 layers of stainless steel wire mesh. The purpose of setting the liquefaction layer between the gas-liquid separator and the recovered methanol storage tank is to prevent the recovered methanol from being entrained by the airflow in the gas-liquid separator after flowing into the recovered methanol storage tank due to the obstruction of the liquefaction layer.
[0012] The L-para-hydroxyphenylglycine methyl ester drying tail gas recovery device described in this utility model has the following significant beneficial effects: 1. The airflow reducer can effectively reduce the flow rate of the dryer tail gas without creating air resistance in the dryer, thus not affecting the drying effect of L-para-hydroxyphenylglycine methyl ester and being beneficial to ensuring product quality; 2. The parallel installation of condenser B and condenser C can also effectively divert and quickly condense the high-speed flowing tail gas; 3. The gas-liquid separator can quickly separate the condensed recovered methanol from the airflow without generating gas-liquid entrainment; 4. The setting of the liquid-repellent layer can ensure that the recovered methanol in the recovered methanol storage tank is not entrained by the airflow, which is very beneficial to improving the methanol recovery rate. Attached Figure Description
[0013] 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.
[0014] Figure 1 This is a schematic diagram of the process and assembly structure of a levorotatory p-hydroxyphenylglycine methyl ester drying tail gas recovery device as described in the embodiment of the present invention.
[0015] Figure 1 In the middle section: Dryer exhaust gas interface 01, airflow reducer 02, airflow inlet A03, airflow outlet B04, airflow outlet C07, built-in condenser 06, condenser B05, condenser C08, cooling water inlet 09, cooling water outlet 10, gas-liquid separator 11, residual gas outlet 12, liquid-repellent layer 13, methanol recovery storage tank 14, vent 15. Detailed Implementation
[0016] 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.
[0017] The L-hydroxyphenylglycine methyl ester drying tail gas recovery device described in this specific embodiment includes: dryer tail gas interface 01, airflow reducer 02, airflow inlet A03, airflow outlet B04, airflow outlet C07, built-in condenser 06, condenser B05, condenser C08, cooling water inlet 09, cooling water outlet 10, gas-liquid separator 11, residual gas outlet 12, liquid-repellent layer 13, methanol recovery storage tank 14, and vent 15.
[0018] The L-hydroxyphenylglycine methyl ester drying tail gas recovery device described in this specific embodiment is characterized in that the top of the airflow reducer 02 is provided with an airflow inlet A03, which is connected to the dryer tail gas interface 01 through a pipe. The airflow reducer 02 is provided with a built-in condenser 06, and airflow outlets B04 and C07 are provided on both sides. Airflow outlet B04 is connected to condenser B05, and airflow outlet C07 is connected to condenser C08. The bottom of the airflow reducer 02 is connected to a gas-liquid separator 11 through a pipe. The bottom of condenser B05 and the bottom of condenser C08 are connected to the gas-liquid separator 11 through a pipe. The bottom of the gas-liquid separator 11 is connected to a methanol recovery storage tank 14. A liphophilic layer 13 is installed between the gas-liquid separator 11 and the methanol recovery storage tank 14. A residual gas outlet 12 is provided on one side of the upper part of the gas-liquid separator 11.
[0019] Furthermore, the simplified operation process of the L-para-hydroxyphenylglycine methyl ester drying tail gas recovery device described in this specific embodiment can be described as follows: First, the cooling water outlet 10 and cooling water inlet 09 are opened. The tail gas from the airflow dryer enters the airflow reducer 02 through the airflow inlet A03. Due to the large diameter and large internal space of the airflow reducer 02, the flow velocity of the tail gas is rapidly reduced. At the same time as the velocity is reduced, some of the recovered methanol is condensed. The reduced tail gas enters the condenser B05 through the airflow outlet B04 and is rapidly condensed. The tail gas enters the condenser 08 through the airflow outlet C07 and is rapidly condensed. The resulting gas-liquid mixture flows rapidly into the gas-liquid separator 11 and then rapidly flows into the recovered methanol storage tank 14 through the condenser layer 13. The residual gas after gas-liquid separation is transferred to the next process for harmless treatment through the residual gas outlet 12.
[0020] Furthermore, the L-hydroxyphenylglycine methyl ester drying tail gas recovery device described in this specific embodiment is characterized in that the airflow reducer is a cylindrical tube sealed at both ends, welded from rigid PP sheet material. The diameter of the airflow reducer is 200-250 cm, and the height is 250-300 cm. The diameter of the airflow reducer designed in this utility model is 6-10 times that of the tail gas pipe. After the high-speed airflow enters the airflow reducer, the flow velocity is quickly reduced, which is very beneficial for cooling and condensation.
[0021] Furthermore, the L-hydroxyphenylglycine methyl ester drying tail gas recovery device described in this specific embodiment is characterized in that the condenser B is a spiral plate condenser, a shell-and-tube condenser, or a serpentine tube condenser, with a heat exchange area of 100-120 m². 2 The purpose of setting a large heat exchange area in the condenser is to rapidly condense the exhaust gas containing methanol.
[0022] Furthermore, the L-hydroxyphenylglycine methyl ester drying tail gas recovery device described in this specific embodiment is characterized in that the condenser C is a spiral plate condenser, a shell-and-tube condenser, or a serpentine tube condenser, with a heat exchange area of 100-120 m². 2 The purpose of setting the condenser to have a large heat exchange area is to rapidly condense the exhaust gas containing methanol.
[0023] Furthermore, the L-para-hydroxyphenylglycine methyl ester drying tail gas recovery device described in this specific embodiment is characterized in that the gas-liquid separator is welded from rigid PP sheet, with a sealed cylinder at the top and a conical or elliptical bottom. The purpose of designing the bottom of the gas-liquid separator as conical or elliptical is to allow the condensed recovered methanol to flow quickly to the recovered methanol storage tank, preventing a portion from being carried away by the airflow.
[0024] Furthermore, the L-para-hydroxyphenylglycine methyl ester drying tail gas recovery device described in this specific embodiment is characterized in that the liquefaction layer is composed of 6-8 layers of stainless steel wire mesh. The purpose of setting the liquefaction layer between the gas-liquid separator and the recovered methanol storage tank is to prevent the recovered methanol from being entrained by the airflow in the gas-liquid separator after flowing into the recovered methanol storage tank due to the obstruction of the liquefaction layer.
[0025] The L-para-hydroxyphenylglycine methyl ester drying tail gas recovery device described in this utility model has the following significant beneficial effects: 1. The airflow reducer can effectively reduce the flow rate of the dryer tail gas without creating air resistance in the dryer, thus not affecting the drying effect of L-para-hydroxyphenylglycine methyl ester and being beneficial to ensuring product quality; 2. The parallel installation of condenser B and condenser C can also effectively divert and quickly condense the high-speed flowing tail gas; 3. The gas-liquid separator can quickly separate the condensed recovered methanol from the airflow without generating gas-liquid entrainment; 4. The setting of the liquid-repellent layer can ensure that the recovered methanol in the recovered methanol storage tank is not entrained by the airflow, which is very beneficial to improving the methanol recovery rate.
[0026] This device, the L-hydroxyphenylglycine methyl ester drying tail gas recovery device described in this utility model, can not only effectively improve the working difficulty of the post-processing steps and reduce safety risks, but also create considerable economic returns.
[0027] This device, a levorotatory p-hydroxyphenylglycine methyl ester drying tail gas recovery device described in this utility model technical solution, also has the characteristics of simple structure, convenient operation, and good methanol recovery effect.
[0028] 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 device for recovering dry tail gas from L- p-hydroxyphenylglycine methyl ester, comprising: The tail gas interface of the dryer, the air inlet A, the air flow reducer, the air outlet B, the air outlet C, the built-in condenser, the condenser A, the condenser B, the cooling water inlet, the cooling water outlet, the gas-liquid separator, the residual gas outlet, the liquid-permeable layer, the recycled methanol storage tank and the venting port are characterized in that the top of the air flow reducer is provided with the air inlet A which is connected with the tail gas interface of the dryer through a pipeline, the air flow reducer is internally provided with the built-in condenser, and the two sides of the air flow reducer are provided with the air outlet B and the air outlet C, the air outlet B is connected with the condenser B, the air outlet C is connected with the condenser C, the bottom of the air flow reducer is connected with the gas-liquid separator through a pipeline, the bottom of the condenser B and the bottom of the condenser C are connected with the gas-liquid separator through a pipeline, the bottom of the gas-liquid separator is connected with the recycled methanol storage tank, a liquid-permeable layer is additionally arranged between the gas-liquid separator and the recycled methanol storage tank, and the upper part of the gas-liquid separator is provided with the residual gas outlet on one side.
2. The apparatus for recovering dry tail gas of L-4-hydroxyphenylglycine methyl ester according to claim 1, characterized in that, The air flow reducer is a cylinder with both ends sealed, which is welded by hard PP plates, the cylinder body of the air flow reducer has a diameter of 200-250 cm and a height of 250-300 cm.
3. The device for recovering dry tail gas of L-4-hydroxyphenylglycine methyl ester according to claim 1, characterized in that, The condenser B is a spiral plate condenser or a column pipe condenser or a snake pipe condenser, and the heat exchange area is 100-120m 2 .
4. The device for recovering dry tail gas of L-4-hydroxyphenylglycine methyl ester according to claim 1, characterized in that, The condenser C is a spiral plate condenser or a column tube condenser or a coil condenser, and the heat exchange area is 100-120m 2 .
5. The device for recovering dry tail gas of L-4-hydroxyphenylglycine methyl ester according to claim 1, characterized in that, The gas-liquid separator is welded by hard PP plates, the upper part of the gas-liquid separator is a sealed cylinder, and the bottom of the gas-liquid separator is in a conical or elliptical shape.
6. The device for recovering dry tail gas of L-4-hydroxyphenylglycine methyl ester according to claim 1, characterized in that, The liquid-permeable layer is composed of 6-8 layers of stainless steel wire meshes.