Apparatus for producing hydrogen chloride from carbon tetrachloride

Abstract

This invention discloses an apparatus for producing hydrogen chloride from carbon tetrachloride, belonging to the field of hydrogen chloride process technology. It aims to solve the problem in existing technologies where the reaction of carbon tetrachloride with water produces toxic phosgene if too little water is used, and hydrogen chloride and carbon dioxide gases are produced if too much water is used. Since the boiling points of these two gases are very close at atmospheric pressure, separation is difficult. The apparatus includes a carbon tetrachloride storage tank and a pure water tank, each equipped with a heater. A first valve is installed on the carbon tetrachloride storage tank, and a second valve is installed on the pure water tank. The carbon tetrachloride storage tank is connected to a first heat exchanger, which is connected to a first gas pump. The pure water tank is connected to a second heat exchanger, which is connected to a second gas pump. The second and first gas pumps are connected to a mixing mechanism, which is connected to a tubular hydrolysis reactor. A concentrated sulfuric acid contact tower is connected to the tubular hydrolysis reactor.

Description

Technical Field

[0001] This invention belongs to the field of hydrogen chloride process technology, specifically relating to an apparatus for producing hydrogen chloride from carbon tetrachloride. Background Technology

[0002] Carbon tetrachloride (CTC) is a type of methane chloride. Newly built or expanded methane chloride plants must take measures to render CTC harmless and ensure that CTC production is zero.

[0003] Currently, there are two main methods for handling CTCs: one is incineration, which involves burning CTCs at high temperatures; the other is conversion of CTCs, using them as raw materials to produce other chemicals in demand in the market. The first method, incineration, is technically simple, requiring only investment in incineration equipment, but it results in resource waste. Chlor-alkali production enterprises typically use the second method, which involves using CTCs as raw materials to produce other chemicals in demand in the market.

[0004] The reaction of carbon tetrachloride with water is one of the second treatment methods. In the presence of a small amount of water, heating carbon tetrachloride to 250°C will decompose the water into phosgene and hydrogen chloride. However, in the presence of excess water, phosgene decomposes, ultimately producing hydrogen chloride and carbon dioxide. The reaction of carbon tetrachloride with water, if using too little water, will produce toxic phosgene; if using too much water, it will produce hydrogen chloride and carbon dioxide gases. Because the boiling points of these two gases are quite close at normal pressure (hydrogen chloride: -85.1°C, carbon dioxide: -78.5°C), separation can be difficult. Summary of the Invention

[0005] (1) Technical problems to be solved

[0006] In view of the shortcomings of the prior art, the purpose of this invention is to provide an apparatus for producing hydrogen chloride from carbon tetrachloride. It aims to solve the problem that in the prior art, the reaction of carbon tetrachloride with water will produce toxic phosgene if the amount of water used is small, and produce hydrogen chloride and carbon dioxide gas if the amount of water used is excessive. Since the boiling points of the two are relatively close at normal pressure, there are certain difficulties in separating them.

[0007] (2) Technical solution

[0008] To solve the above-mentioned technical problems, the present invention provides an apparatus for producing hydrogen chloride from carbon tetrachloride, comprising a carbon tetrachloride storage tank and a pure water tank, wherein the carbon tetrachloride storage tank and the pure water tank are respectively equipped with heaters, a first valve is installed on the carbon tetrachloride storage tank, a second valve is installed on the pure water tank, the carbon tetrachloride storage tank is connected to a first heat exchanger, and a first gas pump is connected to the first heat exchanger.

[0009] The pure water tank is connected to a second heat exchanger, the second heat exchanger is connected to a second air pump, the second air pump and the first air pump are respectively connected to a mixing mechanism, and the mixing mechanism is connected to a tubular hydrolysis reactor.

[0010] The tubular hydrolysis reactor is connected to a concentrated sulfuric acid contact tower, which is connected to a pressure swing adsorption (PSA) separation tower. The PSA separation tower is connected to a hydrogen chloride storage tank and a carbon dioxide storage tank, respectively.

[0011] Furthermore, the mixing mechanism includes a transmission pipe, a guide pipe, and a mixing plate. The transmission pipe and the guide pipe are vertically distributed. The guide pipe is located in the middle of the transmission pipe. The two ends of the transmission pipe are respectively connected to a second air pump and a first air pump.

[0012] Furthermore, a drive motor is provided above the guide tube, a fixing ring is fixed on the outer wall of the drive motor, a support rod is welded on the outer wall of the fixing ring, and the support rod is vertically arranged with its other end fixedly connected to the upper surface of the guide tube.

[0013] Furthermore, the drive motor and the guide tube are spaced apart, and a drive shaft is connected to the output shaft of the drive motor.

[0014] Furthermore, a stirring shaft is fixedly connected to the end of the drive shaft away from the drive motor. The stirring shaft is rotatably disposed inside the guide tube and is arranged vertically.

[0015] Furthermore, mixing plates are fixedly connected to both sides of the stirring shaft, and the mixing plates rotate synchronously with the stirring shaft inside the guide tube.

[0016] Furthermore, the upper surface of the guide tube has a mounting hole through which the drive shaft rotates.

[0017] (3) Beneficial effects

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] This invention features a highly efficient process flow, excellent treatment effect on carbon tetrachloride, reduced resource waste, high separation efficiency, high safety, low cost, and the ability to achieve continuous production. Through the mixing mechanism, before the hydrolysis reaction between carbon tetrachloride and pure water, a drive motor rotates the mixing plate, causing the pure water and carbon tetrachloride flowing through the transmission pipe to come into contact and rapidly mix under agitation. The mixture then flows into the tubular hydrolysis reactor, enhancing the degree of mixing within the reactor and further improving the hydrolysis effect of the tubular hydrolysis reactor on the mixed liquid. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application 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 application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of the present invention;

[0022] Figure 2 This is a schematic diagram of a hybrid mechanism structure;

[0023] Figure 3 This is a schematic diagram of the connection structure between the hybrid board and the drive.

[0024] The labels in the attached diagram are as follows: 1. Carbon tetrachloride storage tank; 2. Pure water tank; 3. First valve; 4. Second valve; 5. First heat exchanger; 6. First air pump; 7. Second heat exchanger; 8. Second air pump; 9. Tubular hydrolysis reactor; 10. Concentrated sulfuric acid contact tower; 11. Pressure swing adsorption separation tower; 12. Hydrogen chloride storage tank; 13. Carbon dioxide storage tank; 14. Mixing mechanism; 15. Transfer pipe; 16. Guide pipe; 17. Support rod; 18. Fixing ring; 19. Drive motor; 20. Drive shaft; 21. Mixing plate; 22. Stirring shaft. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] This specific embodiment describes an apparatus for producing hydrogen chloride from carbon tetrachloride, as shown in the schematic diagram below. Figure 1 As shown, the system includes a carbon tetrachloride storage tank 1 and a pure water tank 2. Both tanks are equipped with heaters. A first valve 3 is installed on the carbon tetrachloride storage tank 1, and a second valve 4 is installed on the pure water tank 2. The carbon tetrachloride storage tank 1 is connected to a first heat exchanger 5, and a first air pump 6 is connected to the first heat exchanger 5. The pure water tank 2 is connected to a second heat exchanger 7, and a second air pump 8 is connected to the second heat exchanger 7. The second air pump 8 and the first air pump 6 are respectively connected to a mixing mechanism 14. A tubular hydrolysis reactor 9 is connected to the mixing mechanism 14. A concentrated sulfuric acid contact tower 10 is connected to the tubular hydrolysis reactor 9. A pressure swing adsorption (PSA) separation tower 11 is connected to the concentrated sulfuric acid contact tower 10. A hydrogen chloride storage tank 12 and a carbon dioxide storage tank 13 are respectively connected to the PSA separation tower 11.

[0027] Reference Figure 2 The mixing mechanism 14 includes a transmission pipe 15, a guide pipe 16, and a mixing plate 21. The transmission pipe 15 and the guide pipe 16 are vertically distributed, with the guide pipe 16 positioned in the middle of the transmission pipe 15. The two ends of the transmission pipe 15 are connected to a second air pump 8 and a first air pump 6, respectively. A drive motor 19 is located above the guide pipe 16. A fixing ring 18 is fixed to the outer wall of the drive motor 19, and a support rod 17 is welded to the outer wall of the fixing ring 18. The support rod 17 is vertically positioned, and its other end is fixedly connected to the upper surface of the guide pipe 16. The drive motor 19 and the guide pipe 16 are spaced apart, and a drive shaft 20 is connected to the output shaft of the drive motor 19.

[0028] Reference Figure 3 A stirring shaft 22 is fixedly connected to the end of the drive shaft 20 away from the drive motor 19. The stirring shaft 22 is rotatably disposed inside the guide tube 16 and is arranged vertically. Mixing plates 21 are fixedly connected to the two side walls of the stirring shaft 22, and the mixing plates 21 rotate synchronously with the stirring shaft 22 inside the guide tube 16. The upper surface of the guide tube 16 has mounting holes through which the drive shaft 20 rotates. The mixing plates 21 are rotated by the drive motor 19, so that the pure water and carbon tetrachloride flowing from the transfer tube 15 come into contact and are quickly mixed together under agitation, and then flow into the tubular hydrolysis reactor 9.

[0029] Working principle: During operation, carbon tetrachloride is vaporized through the first valve 3 and the first heat exchanger 5, and then connected to the inlet of the tubular hydrolysis reactor 9 via the first air pump 6. Pure water from the pure water tank 2 is vaporized through the second valve 4 and the second heat exchanger 7, and then connected to the inlet of the tubular hydrolysis reactor 9 via the second air pump 8. The first air pump 6 and the second air pump 8 adjust the molar ratio of pure water to carbon tetrachloride. Before the hydrolysis reaction, carbon tetrachloride and pure water pass through the mixing mechanism 14, which is driven by the drive motor 19 to rotate the mixing plate 21, causing the pure water flowing from the transmission pipe 15 to pass through the mixing mechanism 14. The carbon tetrachloride is contacted and rapidly mixed together under stirring, and then flows into the tubular hydrolysis reactor 9. The material outlet of the tubular hydrolysis reactor 9 is connected to the feed inlet of the concentrated sulfuric acid contact tower 10, where excess pure water is absorbed by the concentrated sulfuric acid. The outlet of the concentrated sulfuric acid contact tower 10 is connected to the feed inlet of the pressure swing adsorption separation tower 11, and the outlet of the pressure swing adsorption separation tower 11 is connected to the feed inlets of the hydrogen chloride storage tank 12 and the carbon dioxide storage tank 13, where hydrogen chloride and carbon dioxide are collected respectively. The concentrated sulfuric acid in the concentrated sulfuric acid contact tower 10 is replaced periodically to achieve continuous production.

[0030] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. Apparatus for the production of hydrogen chloride from carbon tetrachloride, characterised in that, The utility model relates to a carbon tetrachloride hydrolysis device, including carbon tetrachloride storage tank (1), pure water tank (2), heater is equipped with in carbon tetrachloride storage tank (1) with pure water tank (2) respectively, first valve (3) is installed on carbon tetrachloride storage tank (1), second valve (4) is installed on pure water tank (2), first heat exchanger (5) is connected with carbon tetrachloride storage tank (1), first gas pump (6) is connected on first heat exchanger (5); Pure water tank (2) is connected with second heat exchanger (7), second gas pump (8) is connected on second heat exchanger (7), second gas pump (8), first gas pump (6) are connected with mixing mechanism (14) respectively, and tubular hydrolysis reactor (9) is connected on mixing mechanism (14); Tubular hydrolysis reactor (9) is connected with concentrated sulfuric acid contact tower (10), pressure swing adsorption separation tower (11) is connected on concentrated sulfuric acid contact tower (10), hydrogen chloride storage tank (12) and carbon dioxide storage tank (13) are connected on pressure swing adsorption separation tower (11) respectively.

2. The apparatus for producing hydrogen chloride from carbon tetrachloride according to claim 1, wherein Mixing mechanism (14) includes transmission pipe (15), guide pipe (16), mixing plate (21), transmission pipe (15) and guide pipe (16) are vertically distributed, guide pipe (16) is arranged in the central part of transmission pipe (15), and both ends of transmission pipe (15) are connected with second gas pump (8) and first gas pump (6) respectively.

3. The apparatus for producing hydrogen chloride from carbon tetrachloride according to claim 2, wherein The upper portion of the guide pipe (16) is provided with a driving motor (19), the outer wall of the driving motor (19) is fixedly connected with a fixed ring (18), the outer wall of the fixed ring (18) is welded with a supporting rod (17), and the other end of the supporting rod (17) is fixedly connected with the upper surface of the guide pipe (16).

4. The apparatus for producing hydrogen chloride from carbon tetrachloride according to claim 3, wherein The driving motor (19) and the guide pipe (16) are spaced apart, and the output shaft of the driving motor (19) is connected with a driving shaft (20).

5. The apparatus for producing hydrogen chloride from carbon tetrachloride according to claim 4, wherein The other end of the driving shaft (20) is fixedly connected with a stirring shaft (22) away from the driving motor (19), the stirring shaft (22) is rotatably arranged in the guide pipe (16), and the stirring shaft (22) is vertically arranged.

6. The apparatus for producing hydrogen chloride from carbon tetrachloride according to claim 5, wherein The two side walls of the stirring shaft (22) are fixedly connected with mixing plates (21) respectively, and the mixing plates (21) rotate synchronously with the stirring shaft (22) in the guide pipe (16).

7. The apparatus for producing hydrogen chloride from carbon tetrachloride according to claim 5, wherein The upper surface of the guide pipe (16) has a mounting hole, and the driving shaft (20) rotates through the mounting hole.

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