Sodium acetate solution production device

Abstract

The utility model relates to the technical field of sodium acetate production, in particular to a sodium acetate solution production device which comprises a reaction tank, an acetic acid storage tank and an alkali liquor storage tank. An acetic acid solution is added into the acetic acid storage tank, a mixed solution of sodium carbonate and sodium bicarbonate is added into the alkali liquor storage tank, and the acetic acid storage tank and the alkali liquor storage tank are respectively connected with the reaction tank; an acid liquid conveying pipe is arranged at the bottom of the acetic acid storage tank, extends into the reaction tank and is connected with the liquid distribution plate; a first-stage alkali liquor conveying pipe is arranged at the bottom of the alkali liquor storage tank and connected with a second-stage alkali liquor conveying pipe, an alkali liquor conveying pump is mounted on the second-stage alkali liquor conveying pipe, the second-stage alkali liquor conveying pipe extends into the reaction tank and is connected with a spraying head, a circulating pipe is arranged at the bottom of the reaction tank, and the spraying head is connected with the circulating pipe. And the circulating pump is connected with the secondary alkali liquor conveying pipe. According to the utility model, the reaction at normal temperature is realized in an upper-layer reaction and reaction liquid circulation mode, so that the production cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of sodium acetate production, in particular to a sodium acetate solution production device. Background Art

[0002] Sodium acetate is widely used in sewage treatment as an added organic carbon source. When its concentration exceeds 25%, crystallization will occur in winter, affecting its use. When the concentration is lower than 25%, it is not conducive to reducing the production cost of the enterprise. Therefore, in industrial applications, 25% sodium acetate solution is generally used.

[0003] There are two main methods for producing sodium acetate solution, namely, sodium hydroxide + glacial acetic acid method and soda ash (sodium carbonate) + glacial acetic acid method; in actual production, both methods involve a large amount of exothermic reactions, and the reaction temperature can reach 100° C. or higher. Although a series of process controls are currently adopted, the reaction temperature is still above 80° C. On the one hand, high temperature places high demands on reaction equipment, increasing the cost of equipment; on the other hand, high temperature will also lead to the generation of a large amount of foam during the reaction, and will generate a large amount of water vapor and acid mist entrainment, which is not conducive to environmental protection and the personal safety of operators.

[0004] Therefore, after research, the applicant has developed a method for reacting double alkali (sodium carbonate combined with sodium bicarbonate) with glacial acetic acid, which can control the reaction temperature in principle, and proposed a sodium acetate solution production device, which can control the reaction rate to make the reaction more stable and realize the reaction at room temperature, so as to solve the disadvantages of the above-mentioned prior art. Utility Model Content

[0005] The purpose of the utility model is to provide a sodium acetate solution production device in view of the above-mentioned deficiencies in the prior art, so as to achieve the purpose of being able to control the reaction rate, thereby realizing the preparation of sodium acetate solution at room temperature, solving the harsh conditions of the existing process, thereby reducing equipment costs and contributing to production safety.

[0006] To achieve the above purpose, the utility model adopts the following technical scheme: a sodium acetate solution production device, including a reaction tank, wherein the reaction tank is connected to an acetic acid storage tank and an alkali solution storage tank respectively, a primary alkali solution delivery pipe is arranged at the bottom of the alkali solution storage tank, the primary alkali solution delivery pipe is connected to a secondary alkali solution delivery pipe, the secondary alkali solution delivery pipe is connected to the reaction tank, and a circulation pipe is arranged at the bottom of the reaction tank, the circulation pipe is connected to the secondary alkali solution delivery pipe.

[0007] Furthermore, an acid delivery pipe is provided at the bottom of the acetic acid storage tank, an acid delivery pump is installed on the acid delivery pipe, and the acid delivery pipe extends to the interior of the reaction tank and is connected to the liquid distribution plate.

[0008] Furthermore, the liquid distribution plate is located 20 cm below the liquid surface of the alkali solution after the alkali solution is added.

[0009] Furthermore, a control valve A is installed on the primary alkali liquid delivery pipe, a control valve B is installed on the circulation pipe, and an alkali liquid delivery pump is installed on the secondary alkali liquid delivery pipe. The outlet of the circulation pipe is located behind the control valve A and in front of the alkali liquid delivery pump.

[0010] Furthermore, the secondary alkali solution delivery pipe extends to the interior of the reaction tank and is connected to the spray head.

[0011] Furthermore, a discharge pipe is provided at the bottom of the reaction tank, and a control valve C is installed on the discharge pipe.

[0012] Furthermore, the acetic acid storage tank and the alkali solution storage tank are both provided with a balancing pipe, the acetic acid storage tank is connected to the balancing pipe A, and the alkali solution storage tank is connected to the balancing pipe B. A one-way air valve A is provided on the balancing pipe A, and the outside air flows into the acetic acid storage tank through the one-way air valve A.

[0013] Furthermore, the acetic acid storage tank is provided with an acid mist pipe, the acid mist pipe is connected to the absorption tank, a one-way gas valve B is provided on the acid mist pipe, and the acid mist flows from the acetic acid storage tank through the one-way gas valve B into the absorption tank.

[0014] Beneficial effects of the utility model:

[0015] 1. Double alkali solution mixed with sodium carbonate and sodium bicarbonate is used to react with acetic acid. In the process, the reaction of sodium carbonate is an exothermic reaction, and the reaction of sodium bicarbonate is an endothermic reaction. Therefore, compared with the traditional reaction mode of sodium carbonate or sodium hydroxide, the reaction temperature can be effectively reduced, thereby reducing the equipment cost and avoiding water vapor entrained with acid mist, which is conducive to environmental protection and personal safety of operators;

[0016] 2. By adding alkali solution first, then adding acid solution on the upper layer and circulating the reaction solution, the reaction rate can be controlled, thereby controlling the temperature during the reaction process and making the reaction more stable;

[0017] 3. By setting up balance pipes and acid mist pipes, it plays a positive role in the stable operation of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 It is a schematic diagram of the structure of the liquid distribution plate of the utility model.

[0020] The names corresponding to the marks in the figure are:

[0021] 1. Acetic acid storage tank; 11. Acid delivery pipe; 111. Acid delivery pump; 12. Balance pipe A; 121. One-way air valve A; 13. Acid mist pipe; 131. One-way air valve B; 2. Alkali storage tank; 21. Primary alkali delivery pipe; 211. Control valve A; 22. Secondary alkali delivery pipe; 221. Alkali delivery pump; 23. Balance pipe B; 3. Reaction tank; 31. Liquid distribution plate; 311. Liquid distribution cavity; 312. Liquid distribution hole; 32. Sprinkler head; 33. Circulation pipe; 331. Control valve B; 34. Discharge pipe; 341. Control valve C; 4. Absorption tank. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the utility model.

[0023] Embodiments of the present utility model:

[0024] like Figure 1-2 As shown, in this embodiment, an acetic acid storage tank 1 and an alkali liquid storage tank 2 are provided, and the acetic acid storage tank 1 and the alkali liquid storage tank 2 are respectively connected to the reaction tank 3, wherein an acid liquid delivery pipe 11 is provided at the bottom of the acetic acid storage tank 1, and the acid liquid delivery pipe 11 is connected to the reaction tank 3, and an acid liquid delivery pump 111 is installed on the acid liquid delivery pipe 11, and the acid liquid delivery pipe 11 extends to the interior of the reaction tank 3 and is connected to a liquid distribution plate 31, wherein a liquid distribution cavity 311 is provided in the liquid distribution plate 31, and the liquid distribution cavity 311 is connected to the acid liquid delivery pipe 11, and liquid distribution holes 312 are evenly distributed above the liquid distribution plate 31.

[0025] A primary alkali liquid delivery pipe 21 is arranged at the bottom of the alkali liquid storage tank 2, and the primary alkali liquid delivery pipe 21 is connected to the secondary alkali liquid delivery pipe 22. An alkali liquid delivery pump 221 is installed on the secondary alkali liquid delivery pipe 22. The secondary alkali liquid delivery pipe 22 extends to the interior of the reaction tank 3 and is connected to the spray head 32. A circulation pipe 33 is arranged at the bottom of the reaction tank 3, and the circulation pipe 33 is connected to the secondary alkali liquid delivery pipe 22. A control valve A211 is installed on the primary alkali liquid delivery pipe 21, and a control valve B331 is installed on the circulation pipe 33. A discharge pipe 34 is arranged at the bottom of the reaction tank 3, and a control valve C341 is installed on the discharge pipe 34.

[0026] A balancing pipe A12 is arranged above the acetic acid storage tank 1, and a one-way air valve A121 is arranged on the balancing pipe A12, and the outside air flows into the acetic acid storage tank 1 through the one-way air valve A121, and an acid mist pipe 13 is arranged on the acetic acid storage tank 1, the acid mist pipe 13 is connected to the absorption tank 4, and a one-way air valve B131 is arranged on the acid mist pipe 13, and the acid mist in the acetic acid storage tank 1 flows into the absorption tank 4 through the one-way air valve B131; and a balancing pipe B23 is arranged on the alkali solution storage tank 2.

[0027] The principle of this utility model is:

[0028] Before the reaction starts, the utility model adds acetic acid solution (50% w / w) into the acetic acid storage tank 1, and adds alkali solution into the alkali solution storage tank 2, wherein the alkali solution is a mixed solution of baking soda (sodium bicarbonate) and soda ash (sodium carbonate) (specific gravity 1.02g / cm3); when the reaction starts, the control valve A211 is first opened, the control valve B331 is closed, and the alkali solution delivery pump 221 is started, so that the alkali solution in the alkali solution storage tank 2 can be delivered to the reaction tank 3.

[0029] After the above operation is completed, the acid solution delivery pump 111 is started to add the acetic acid solution in the acetic acid storage tank 1 to the reaction tank 3. Then, in the reaction tank 3, the acetic acid reacts with the alkali to obtain a sodium acetate solution. It should be noted that the amount of a single batch of materials in the reaction tank 3 is controlled so that after the alkali solution is added, the position of the liquid distribution plate 31 is about 20 cm below the liquid surface at this time, so that the reaction is carried out in the upper layer of the reaction tank 3. The reactions involved in the process are as follows:

[0030]

[0031]

[0032] Therefore, heat balance in the device can be achieved through heat release and heat absorption. The temperature in the actual production process is 40°C, achieving room temperature production. Compared with the traditional reaction of sodium carbonate or sodium hydroxide with acetic acid to produce sodium acetate, the reaction temperature can be effectively reduced. On the one hand, it has low requirements on equipment and reduces equipment costs. On the other hand, it also avoids the entrainment of acid mist from water vapor during the production process, which is helpful for environmental protection and the personal safety of operators.

[0033] After the above-mentioned acetic acid is added, the reaction is carried out in the upper layer of the reaction tank 3. Therefore, after the acetic acid is added, the reaction tank 3 needs to be circulated. At this time, the control valve B331 is opened (the aforementioned control valve A211 is closed after the alkali solution is added). At this time, the alkali solution delivery pump 221 is started, so that the reaction liquid in the reaction tank 3 can be circulated. The process only needs to be circulated once, and then a sodium acetate solution can be obtained. During the production process, by controlling the amount and concentration of the alkali solution and the acid solution, a 25±1% w / w sodium acetate solution can be directly obtained (there is no other discharge, and the finished product is a 25% w / w sodium acetate solution), which can be directly used in industry, and the generated sodium acetate solution can be directly discharged through the discharge pipe 34.

[0034] It should be noted that acetic acid and alkaline solution are both corrosive materials. In the present invention, each device needs to be treated with anti-corrosion, such as using anti-corrosion lining for the pipeline, anti-corrosion materials (such as corrosion-resistant ceramics, etc.) for the liquid distribution plate 31 and the sprinkler head 32, and corrosion-resistant pumps and valves, etc., so as to ensure the stable use of the device.

[0035] At the same time, in order to ensure the stable operation of the device, balance pipes are provided on the acetic acid storage tank 1 and the alkali solution storage tank 2. For the acetic acid storage tank 1, in order to prevent the escape of acid mist, a one-way air valve A121 needs to be installed on its balance pipe A12, and the acid mist is absorbed (acid mist can easily cause equipment corrosion, and if accidentally leaked, it can also easily cause safety accidents). The absorption liquid in the absorption tank 4 can be clean water.

Claims

1. A sodium acetate solution production device, characterized in that: The invention comprises a reaction tank (3), wherein the reaction tank (3) is connected to an acetic acid storage tank (1) and an alkali liquid storage tank (2) respectively; a primary alkali liquid delivery pipe (21) is arranged at the bottom of the alkali liquid storage tank (2); the primary alkali liquid delivery pipe (21) is connected to a secondary alkali liquid delivery pipe (22); the secondary alkali liquid delivery pipe (22) is connected to the reaction tank (3); a circulation pipe (33) is arranged at the bottom of the reaction tank (3); the circulation pipe (33) is connected to the secondary alkali liquid delivery pipe (22).

2. A sodium acetate solution production device according to claim 1, characterized in that: An acid liquid delivery pipe (11) is arranged at the bottom of the acetic acid storage tank (1), an acid liquid delivery pump (111) is installed on the acid liquid delivery pipe (11), and the acid liquid delivery pipe (11) extends to the interior of the reaction tank (3) and is connected to the liquid distribution plate (31).

3. A sodium acetate solution production device according to claim 2, characterized in that: The liquid distribution plate (31) is located 20 cm below the liquid surface of the alkali solution after the alkali solution is added.

4. A sodium acetate solution production device according to claim 1, characterized in that: The primary alkali liquid delivery pipe (21) is provided with a control valve A (211), the circulation pipe (33) is provided with a control valve B (331), the secondary alkali liquid delivery pipe (22) is provided with an alkali liquid delivery pump (221), and the outlet of the circulation pipe (33) is located behind the control valve A (211) and in front of the alkali liquid delivery pump (221).

5. A sodium acetate solution production device according to claim 1, characterized in that: The secondary alkali solution delivery pipe (22) extends to the interior of the reaction tank (3) and is connected to the spray head (32).

6. A sodium acetate solution production device according to claim 1, characterized in that: A discharge pipe (34) is provided at the bottom of the reaction tank (3), and a control valve C (341) is installed on the discharge pipe (34).

7. A sodium acetate solution production device according to claim 1, characterized in that: The acetic acid storage tank (1) and the alkali solution storage tank (2) are both provided with a balancing pipe. The acetic acid storage tank (1) is connected to the balancing pipe A (12), and the alkali solution storage tank (2) is connected to the balancing pipe B (23). A one-way air valve A (121) is provided on the balancing pipe A (12), and external air flows into the acetic acid storage tank (1) through the one-way air valve A (121).

8. A sodium acetate solution production device according to claim 1, characterized in that: The acetic acid storage tank (1) is provided with an acid mist pipe (13), the acid mist pipe (13) is connected to the absorption tank (4), and a one-way gas valve B (131) is provided on the acid mist pipe (13), so that the acid mist flows from the acetic acid storage tank (1) into the absorption tank (4) through the one-way gas valve B (131).

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