Dry hydrogen chloride preparation device

Abstract

The utility model discloses a dry hydrogen chloride preparation device and belongs to the technical field of pharmaceutical chemical production devices and gas generation. The device is formed by combining and connecting a concentrated sulfuric acid head tank, a pressure balancer, a hydrogen chloride generator, a settler, a gas guide pipe, a dryer, a gas flow disperser, a buffer tank, a dry hydrogen chloride outlet, a tail gas treatment control valve and the like, the main technical innovation points comprise three aspects: 1, a pressure balancer is additionally arranged between a concentrated sulfuric acid dripping head tank and a hydrogen chloride generator, 2, a settler is designed and additionally arranged at a hydrogen chloride airflow outlet, and 3, a concentrated sulfuric acid dryer is designed and additionally arranged; the dry hydrogen chloride preparation device provided by the technical scheme of the utility model effectively meets the requirements on dry hydrogen chloride gas in raw material medicines and chemical production processes, and has the advantages that the dry hydrogen chloride gas can be prepared at any time as required and dangerous gas raw materials are not stored; the method also has the characteristics of high hydrogen chloride purity, safe process and convenient operation.

Description

Technical Field

[0001] This utility model belongs to the field of pharmaceutical and chemical production equipment and gas generation technology, and specifically relates to a device for preparing dry hydrogen chloride. Background Technology

[0002] Dry hydrogen chloride is an important raw material for the synthesis of pharmaceuticals and fine chemicals, and is widely used in antibiotics, analgesics, amino acid hydrochlorides, p-chlorophenylglycine, dyes, pesticides, and other fields. However, the presence of a small amount of moisture during hydrogen chloride production poses a significant challenge to its application. The presence of moisture not only affects the reaction process but also causes severe corrosion to equipment.

[0003] On the other hand, hydrogen chloride (HCl) gas is a hazardous chemical that needs to be stored in high-pressure steel cylinders, requiring relatively strict conditions for transportation and storage. Long-term storage of these raw materials by chemical companies inevitably poses certain safety risks to the workplace and the atmospheric environment. Therefore, producing only the amount of dried hydrogen chloride needed as required is a good choice for many pharmaceutical and fine chemical manufacturers. Summary of the Invention

[0004] To address the above-mentioned problems, this utility model discloses a dry hydrogen chloride preparation device. Based on the characteristics of ammonium chloride generating ammonium sulfate and releasing hydrogen chloride under the action of concentrated sulfuric acid, the technical solution combines and designs a dry hydrogen chloride preparation device with the preparation process flow. Its main technical innovations include three aspects: (1) a pressure balancer is installed between the high-level tank for adding concentrated sulfuric acid and the hydrogen chloride generator; (2) a settling device is designed and installed at the hydrogen chloride gas outlet; and (3) a concentrated sulfuric acid dryer with a hydrogen chloride gas flow disperser is designed and installed. The dry hydrogen chloride preparation device described in this utility model effectively solves the demand for dry hydrogen chloride gas in the production processes of pharmaceutical raw materials and chemicals, and has the advantages of being able to prepare it whenever needed and not storing hazardous gas raw materials. It also features high hydrogen chloride purity, safe process, and convenient operation.

[0005] The present invention discloses a device for preparing dried hydrogen chloride, comprising: a concentrated sulfuric acid high-level tank, a pressure balancer, a sulfuric acid dripping valve, a hydrogen chloride generator, an ammonium chloride feed port, a settling tank, a gas guide pipe, a hydrogen chloride dryer, a sulfuric acid replenishment valve, an airflow disperser, a buffer tank, a dried hydrogen chloride outlet, a tail gas treatment control valve, a steam inlet, a condensate drain valve, and a water inlet control valve. The concentrated sulfuric acid high-level tank is positioned above the hydrogen chloride generator. The bottom of the concentrated sulfuric acid high-level tank is connected to one end of the pressure balancer via a pipe. The other end of the pressure balancer is connected to the upper part of the gas generator and extends into the hydrogen chloride generator. The upper part of the hydrogen chloride generator is equipped with an ammonium chloride feed port and a water inlet control valve. The upper part of the hydrogen chloride generator is connected to the bottom of the settling tank. The upper part of the settling tank is connected to the hydrogen chloride dryer via a gas guide pipe and extends into the airflow disperser. The top of the hydrogen chloride dryer is also connected to the sulfuric acid replenishment valve and the hydrogen chloride gas guide pipe, and is connected to the upper part of the buffer tank via the gas guide pipe. The top of the buffer tank is equipped with a dried hydrogen chloride outlet and a tail gas treatment control valve.

[0006] Preferably, in the dry hydrogen chloride preparation apparatus described in this utility model, the bottom of the concentrated sulfuric acid high-level tank is 500-600 cm higher than the sulfuric acid dripping valve of the hydrogen chloride generator. This design aims to overcome the positive pressure generated by the hydrogen chloride generator during operation by utilizing the gravity of the concentrated sulfuric acid at its higher position, thereby ensuring the smooth dripping of sulfuric acid.

[0007] Preferably, the dry hydrogen chloride preparation device described in this utility model is characterized in that the main body of the pressure balancer is a U-shaped bend with a diameter of 25-40 mm and an unfolded length of 5-6 m, and the pressure balancer is made of carbon steel or stainless steel. The purpose of adding the pressure balancer is to ensure the stability and smoothness of the concentrated sulfuric acid dripping process, which is beneficial to process safety and production efficiency.

[0008] Preferably, the apparatus for preparing dried hydrogen chloride according to the present invention is characterized in that the airflow disperser is an annular tube made of titanium alloy or PTFE with a diameter of 40-50 mm. The purpose of adding the airflow disperser is to ensure that the hydrogen chloride gas flow is dispersed as evenly as possible in concentrated sulfuric acid, ensuring that the moisture in the newly generated hydrogen chloride is absorbed by the concentrated sulfuric acid to the maximum extent.

[0009] Preferably, the dry hydrogen chloride preparation device described in this utility model is characterized in that the settling device is a cylinder with conical protrusions at both ends, made of rigid PP pipe with a diameter of 300mm, and the settling device itself is 500-600mm high. This design aims to prevent gas-solid entrainment caused by high-speed airflow, which is beneficial for safe production.

[0010] Preferably, the apparatus for preparing dried hydrogen chloride according to the present invention is characterized in that the surface of the airflow disperser has 50 to 100 circular holes with a diameter of 10 mm. The design of drilling holes on the surface of the airflow disperser is to ensure that the hydrogen chloride gas flow is dispersed as evenly as possible in the concentrated sulfuric acid, and also to effectively prevent the formation of large bubbles in the concentrated sulfuric acid during the drying process.

[0011] The present invention discloses a dry hydrogen chloride preparation device, which offers four significant advantages: 1. It can be used and prepared on demand, avoiding the transportation and long-term storage of gaseous hazardous chemicals, thus benefiting safety and environmental protection; 2. The design and installation of the settling tank effectively prevents gas-solid entrainment, thereby preventing pipeline blockage, which is highly beneficial to production safety; 3. The addition of a buffer tank effectively prevents backflow of the reaction liquid in the next process, which is beneficial to production safety, product quality, and yield; 4. It also features high hydrogen chloride purity, safe process, and convenient operation. Attached Figure Description

[0012] 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.

[0013] Figure 1 This is a schematic diagram of the process and structure of a drying hydrogen chloride preparation device according to an embodiment of the present invention.

[0014] Figure 1 In the middle section: Hydrogen chloride generator 01, concentrated sulfuric acid high-level tank 02, pressure balancer 03, settling tank 04, ammonium chloride feed port 05, sulfuric acid dripping valve 06, ammonium sulfate discharge valve 07, steam inlet 08, steam trap 09, water inlet control valve 10, gas guide pipe 18, hydrogen chloride dryer 11, airflow disperser 12, sulfuric acid replenishment valve 13, waste acid discharge valve 14, buffer tank 15, dried hydrogen chloride outlet 16, buffer tank discharge valve 17, tail gas treatment control valve 19. Detailed Implementation

[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 apparatus for preparing dried hydrogen chloride according to this specific embodiment includes: a hydrogen chloride generator 01, a concentrated sulfuric acid high-level tank 02, a pressure balancer 03, a settling tank 04, an ammonium chloride feed port 05, a sulfuric acid dripping valve 06, an ammonium sulfate discharge valve 07, a steam inlet 08, a steam trap 09, a water inlet control valve 10, a gas guide pipe 18, a hydrogen chloride dryer 11, an airflow disperser 12, a sulfuric acid replenishment valve 13, a waste acid discharge valve 14, a buffer tank 15, a dried hydrogen chloride outlet 16, a buffer tank discharge valve 17, and a tail gas treatment control valve 19.

[0017] The apparatus for preparing dried hydrogen chloride according to this specific embodiment is characterized in that the concentrated sulfuric acid high-level tank 02 is located above the hydrogen chloride generator 01. The bottom of the concentrated sulfuric acid high-level tank 02 is connected to one end of the pressure balancer 03 through a pipe. The other end of the pressure balancer 03 is connected to the top of the hydrogen chloride generator 01 and extends into the hydrogen chloride generator 01. The upper part of the hydrogen chloride generator 01 is provided with an ammonium chloride feeding port 05 and a water inlet control valve 10. The upper part of the hydrogen chloride generator 01 is connected to the bottom of the settling tank 04. The upper part of the settling tank 04 is connected to the hydrogen chloride dryer 11 through a gas guide pipe 18 and extends into the settling tank 11 to connect to the gas flow disperser 12. The top of the hydrogen chloride dryer 11 is also connected to a sulfuric acid replenishment valve 13 and a hydrogen chloride gas guide pipe, and is connected to the upper part of a buffer tank 15 through the gas guide pipe. The top of the buffer tank 15 is provided with a dried hydrogen chloride outlet 16 and a tail gas treatment control valve 19.

[0018] Furthermore, the simplified operation of the hydrogen chloride drying preparation device described in this specific embodiment can be described as follows: First, according to the calculated amount, sufficient ammonium chloride is added to the hydrogen chloride generator 01, and a certain amount of concentrated sulfuric acid is injected into the hydrogen chloride dryer 11. Then, the ammonium chloride feed port 05 is closed, and the sulfuric acid dripping valve 06 is opened to allow concentrated sulfuric acid to slowly flow into the hydrogen chloride generator 01 through the pressure balancer. The steam inlet 08 is opened, and at this moment, the generated hydrogen chloride gas will enter the pre-added concentrated sulfuric acid through the settling device 04, the gas guide pipe 18, and the gas flow disperser 12. In the sulfuric acid hydrogen chloride dryer 11, the hydrogen chloride gas dried by concentrated sulfuric acid passes through the buffer tank 15 and the dried hydrogen chloride outlet 16 and enters the next process for use. When the amount of hydrogen chloride produced reaches the requirements of the next process, the tail gas treatment control valve 19 is opened, and the residual hydrogen chloride gas is treated in another process to render it harmless. When the hydrogen chloride gas is completely released, the water inlet control valve 10 at the top of the hydrogen chloride generator 01 is opened, and a certain amount of tap water is injected into the hydrogen chloride generator 01. After stirring and dissolving, the ammonium sulfate discharge valve 07 is opened to transfer the ammonium sulfate solution to the next process for recycling.

[0019] Furthermore, in the embodiment of this specific implementation, the apparatus for preparing dried hydrogen chloride is characterized in that the bottom of the concentrated sulfuric acid high-level tank is 500-600 cm higher than the sulfuric acid dripping valve of the hydrogen chloride generator. This design aims to overcome the positive pressure generated by the hydrogen chloride generator during operation by utilizing the gravity of the concentrated sulfuric acid at its higher position, thereby ensuring the smooth dripping of sulfuric acid.

[0020] Furthermore, in the embodiment of this specific implementation of the apparatus for preparing dried hydrogen chloride, the main body of the pressure balancer is a U-shaped bend with a diameter of 25-40 mm and an unfolded length of 5-6 m. The pressure balancer is made of carbon steel or stainless steel. The purpose of adding the pressure balancer is to ensure the stability and smoothness of the concentrated sulfuric acid dripping process, which is beneficial to process safety and production efficiency.

[0021] Furthermore, in the embodiment of this specific implementation of the apparatus for preparing dried hydrogen chloride, the airflow disperser is characterized by being an annular tube made of titanium alloy or PTFE with a diameter of 40-50 mm. The purpose of adding the airflow disperser is to ensure that the hydrogen chloride gas flow is dispersed as uniformly as possible in the concentrated sulfuric acid, thereby maximizing the absorption of moisture from the newly generated hydrogen chloride by the concentrated sulfuric acid.

[0022] Furthermore, in this specific embodiment of the apparatus for preparing dried hydrogen chloride, the settling device is characterized in that the settling device is a cylinder with conical protrusions at both ends, made of rigid PP pipe with a diameter of 300mm, and the settling device itself is 500-600mm high. This design aims to prevent gas-solid entrainment caused by high-speed airflow, which is beneficial for safe production.

[0023] Furthermore, in the embodiment of this specific implementation of the apparatus for preparing dried hydrogen chloride, the airflow disperser has 50 to 100 circular holes with a diameter of 10 mm on its surface. The design of drilling holes on the surface of the airflow disperser is to ensure that the hydrogen chloride gas flow is dispersed as evenly as possible in the concentrated sulfuric acid, while also effectively preventing the formation of large bubbles in the concentrated sulfuric acid during the drying process.

[0024] The present invention discloses a dry hydrogen chloride preparation device, which offers four significant advantages: 1. It can be used and prepared on demand, avoiding the transportation and long-term storage of gaseous hazardous chemicals, thus benefiting safety and environmental protection; 2. The design and installation of the settling tank effectively prevents gas-solid entrainment, thereby preventing pipeline blockage, which is highly beneficial to production safety; 3. The addition of a buffer tank effectively prevents backflow of the reaction liquid in the next process, which is beneficial to production safety, product quality, and yield; 4. It also features high hydrogen chloride purity, safe process, and convenient operation.

[0025] 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. An apparatus for preparing dried hydrogen chloride, comprising: The system comprises a concentrated sulfuric acid high-level tank, a pressure balancer, a sulfuric acid dripping valve, a hydrogen chloride generator, an ammonium chloride feed port, a settling tank, a gas guide pipe, a hydrogen chloride dryer, a sulfuric acid replenishment valve, an airflow disperser, a buffer tank, a dried hydrogen chloride outlet, a tail gas treatment control valve, a steam inlet, a condensate drain valve, and a water inlet control valve. The concentrated sulfuric acid high-level tank is located above the hydrogen chloride generator. The bottom of the high-level tank is connected to one end of the pressure balancer via a pipe. The other end of the pressure balancer is connected to the upper part of the hydrogen chloride generator and extends into the generator. The upper part of the hydrogen chloride generator is equipped with an ammonium chloride feed port and a water inlet control valve. The upper part of the settling tank is connected to the bottom of the settling tank. The upper part of the settling tank is connected to the hydrogen chloride dryer via a gas guide pipe and extends into the dryer, connecting to the airflow disperser. The top of the hydrogen chloride dryer is also connected to the sulfuric acid replenishment valve and the hydrogen chloride gas guide pipe, which in turn connects to the upper part of the buffer tank. The top of the buffer tank is equipped with a dried hydrogen chloride outlet and a tail gas treatment control valve.

2. The apparatus for preparing dried hydrogen chloride according to claim 1, characterized in that, The bottom of the concentrated sulfuric acid high-level tank is 500-600 cm above the sulfuric acid dripping valve of the hydrogen chloride generator.

3. The apparatus for preparing dried hydrogen chloride according to claim 1, characterized in that, The main body of the pressure balancer is a U-shaped bend with a diameter of 25-40mm and an unfolded length of 5-6m. The pressure balancer is made of carbon steel or stainless steel.

4. The apparatus for preparing dried hydrogen chloride according to claim 1, characterized in that, The settling device is a cylinder with conical protrusions at both ends, made of rigid PP pipe with a diameter of 300mm, and the settling device itself is 500-600mm high.

5. The apparatus for preparing dried hydrogen chloride according to claim 1, characterized in that, The airflow diffuser is an annular tube made of titanium alloy or PTFE, with a diameter of 40-50 mm.

6. The apparatus for preparing dried hydrogen chloride according to claim 1, characterized in that, The airflow diffuser has 50 to 100 circular holes with a diameter of 10 mm on its surface.

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