Production process and production equipment of sodium acetate

Abstract

The invention discloses a production process and production equipment of sodium acetate, and the production process comprises the following steps: reacting acetic acid and sodium hydroxide according to a certain proportion at a certain temperature and pressure to generate a sodium acetate solution; the production method of the sodium acetate solution comprises the following specific production steps: step 1, a reaction stage: preparing an acetic acid solution and sodium hydroxide, and putting the acetic acid solution and sodium hydroxide into a reaction kettle according to a certain proportion; 2, reaction stirring: starting a stirring device of the reaction kettle, and fully mixing and reacting acetic acid and sodium hydroxide; 3, an evaporation and concentration stage; 4, a crystallization and centrifugal separation stage; step 5, centrifugal separation; according to the technology, through multi-stage evaporation concentration, recrystallization and reasonable drying treatment, the production efficiency of sodium acetate can be improved, the high purity of the product and the uniformity of the granularity can be guaranteed, and the requirement of the market for high-quality sodium acetate is met.

Description

Technical Field

[0001] The invention relates to the technical field of sodium acetate production, and in particular to a production process and production equipment of sodium acetate. Background Art

[0002] As an important salt of organic acid, sodium acetate is widely used in many fields. In the chemical industry, it is an important intermediate in many organic synthesis reactions and can be used to synthesize other organic compounds. In the food industry, it can be used as a food additive to play a role in seasoning and preservation. In the medical field, it also has certain application value.

[0003] With the increasing market demand for sodium acetate, the requirements for its production process are also increasing. There are some shortcomings in the traditional sodium acetate production process, such as low production efficiency, which is difficult to meet the needs of large-scale production; the product purity is not high, and it may be mixed with unreacted raw materials or other impurities, affecting its application in some fields with high purity requirements (such as medicine, high-end chemical synthesis); and more waste may be generated during the production process, causing certain pressure on the environment. In addition, the particle size distribution of the sodium acetate product obtained by the traditional process is uneven, and it cannot meet the requirements in some application scenarios that require fine particle size control. Therefore, it is of great significance to develop a sodium acetate production process and production equipment that is efficient, high-purity, environmentally friendly and can accurately control the product particle size. The present invention aims to overcome the defects of the prior art and provide a new sodium acetate production process and production equipment thereof to meet the market demand for high-quality sodium acetate. Summary of the invention

[0004] The object of the present invention is to solve at least one of the technical problems existing in the prior art, and to provide a production process and a production device of sodium acetate. Through this process, multi-stage evaporation concentration, recrystallization and reasonable drying treatment are carried out, which can not only improve the production efficiency of sodium acetate, but also ensure the high purity and uniformity of particle size of the product, thereby meeting the market demand for high-quality sodium acetate.

[0005] The present invention also provides a production process of the above sodium acetate, comprising reacting acetic acid and sodium hydroxide in a certain ratio at a certain temperature and pressure to generate a sodium acetate solution;

[0006] The specific production steps of the sodium acetate solution are as follows:

[0007] Step 1, reaction stage: prepare acetic acid solution and sodium hydroxide, and put them into the reaction kettle according to a certain ratio;

[0008] Step 2: Reaction stirring: Turn on the stirring device of the reactor to allow the acetic acid and sodium hydroxide to fully mix and react; ensure the uniformity and thoroughness of the reaction and improve the purity and yield of the product.

[0009] Step 3, evaporation and concentration stage: the liquid phase 1 obtained by the reaction is transported to evaporation tank 1 for primary evaporation and concentration to obtain concentrated solution 1, and the concentrated solution 1 is transported to evaporation tank 2 for secondary evaporation and concentration to obtain concentrated solution 2; 20% liquid sodium acetate in concentrated solution 1 and 25% liquid sodium acetate in concentrated solution 2 are used as carbon sources for water treatment;

[0010] Step 4, crystallization and centrifugal separation stage: the concentrated concentrate 2 is transported to the crystallizer 1 for cooling and crystallization; during the cooling process, the solubility of sodium acetate decreases and gradually precipitates from the solution to form a crystalline mixed solution 1.

[0011] Step 5, centrifugal separation: the crystallization mixture is transported to a centrifuge for centrifugal separation to obtain a crystal and a mother liquor; the mother liquor can be transported to a concentration tank for concentration treatment to recover the sodium acetate therein and improve the yield of the product.

[0012] Step 6, recrystallization and drying stage: transporting the crystal 1 to the crystallizer 2 for recrystallization;

[0013] Step 7, centrifugal separation and drying: the recrystallization liquid is placed in a second centrifuge for centrifugal separation to obtain a second crystal.

[0014] According to a sodium acetate production process provided by the present invention, the temperature of the reactor in the reaction stage is controlled at 50°C and the pH value is controlled at 6.5 to 7.5, and the reaction is carried out under such conditions to generate a sodium acetate solution. This reaction process is relatively mild and the reaction rate is relatively stable, which is conducive to subsequent processing.

[0015] According to a sodium acetate production process provided by the present invention, the concentrated liquid 1 is drained when the density of the concentrated liquid 1 is 1170kg·m-3 to obtain the evaporated liquid 1 and the preliminarily concentrated concentrated liquid 1, and the concentrated liquid 2 is drained when the density of the concentrated liquid 2 is 1230kg·m-3. The evaporated liquid 1 and the preliminarily concentrated concentrated liquid 1 are obtained, and the evaporated liquid 1 can be transported to a concentration tank for concentration to obtain an acetic acid solution for recycling and reducing the consumption of raw materials. Through two-stage evaporation and concentration, the concentration of the sodium acetate solution can be effectively increased to prepare for the subsequent crystallization process.

[0016] According to a production process of sodium acetate provided by the present invention, the recrystallization medium in the recrystallization and drying stages adopts a mixed medium of deionized water and ethanol in a volume ratio of 1:2, and the difference in polarity between water and ethanol is utilized to better control the crystals of sodium acetate during the dissolution and recrystallization process, thereby obtaining crystals with fine and uniform particle size.

[0017] According to a production process of sodium acetate provided by the present invention, the crystals obtained by centrifugal separation and drying are washed with deionized water and then transported to a drying device for drying and dehydration. The drying device can be a fluidized bed dryer, which is first dried at 85° C. for 15 minutes, and then continued to heat to 125° C. for drying for 20 minutes, to finally obtain a high-purity sodium acetate product.

[0018] A sodium acetate production device provided by the present invention comprises: a reaction device, a primary evaporation device, a secondary evaporation device, a first crystallization device, a first centrifugation device, a second crystallization device, and a second centrifugation device.

[0019] According to a sodium acetate production device provided by the present invention, the output end of the reaction device is connected to a primary evaporation device through a delivery pipeline, the output end of the primary evaporation device is connected to a secondary evaporation device through a delivery pipeline, and the output end of the secondary evaporation device is connected to a first crystallization device through a delivery pipeline.

[0020] According to a sodium acetate production equipment provided by the present invention, the output end of the first crystallization device is connected to a first centrifuge through a conveying pipeline, the output end of the first centrifugal device is connected to a second crystallization device through a conveying pipeline, and the output end of the second crystallization device is connected to a second centrifugal device through a conveying pipeline.

[0021] Compared with the prior art, the production process and production equipment of sodium acetate of the present invention can improve the production efficiency of sodium acetate and ensure the high purity and uniformity of particle size of the product through multi-stage evaporation concentration, recrystallization and reasonable drying treatment, thereby meeting the market demand for high-quality sodium acetate. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention is further described below in conjunction with the accompanying drawings and embodiments;

[0023] Figure 1 A production process flow chart of sodium acetate according to the present invention;

[0024] Figure 2 The present invention is a general structure diagram of a sodium acetate production device.

[0025] Legend:

[0026] 1. Reactor; 2. Evaporation tank 1; 3. Evaporation tank 2; 4. Crystallizer 1; 5. Centrifuge 1; 6. Crystallizer 2; 7. Centrifuge 2. DETAILED DESCRIPTION

[0027] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0028] Reference Figure 1 , a sodium acetate production process according to an embodiment of the present invention comprises: reacting acetic acid and sodium hydroxide in a certain ratio at a certain temperature and pressure to generate a sodium acetate solution;

[0029] The specific production steps of the sodium acetate solution are as follows:

[0030] Step 1, reaction stage: prepare acetic acid solution and sodium hydroxide, and put them into the reactor according to a certain ratio; Step 2, reaction stirring: turn on the stirring device of the reactor to fully mix acetic acid and sodium hydroxide and react; Step 3, evaporation and concentration stage: transport the liquid phase 1 obtained by the reaction to evaporation tank 1 for primary evaporation and concentration to obtain concentrated solution 1, and transport the concentrated solution 1 to evaporation tank 2 for secondary evaporation and concentration to obtain concentrated solution 2; 20% liquid sodium acetate in concentrated solution 1 and 25% liquid sodium acetate in concentrated solution 2 are used as carbon sources for water treatment; Step 4, crystallization and centrifugal separation stage: transport the concentrated concentrated solution 2 to crystallizer 1 for cooling and crystallization; Step 5, centrifugal separation: transport the crystallization mixed solution 1 to centrifuge 1 for centrifugal separation to obtain crystal 1 and mother liquor 1; Step 6, recrystallization and drying stage: transport the crystal 1 to crystallizer 2 for recrystallization; Step 7, centrifugal separation and drying: place the recrystallization liquid after recrystallization in centrifuge 2 for centrifugal separation to obtain crystal 2.

[0031] During the reaction stage, the temperature of the reactor is controlled at 50°C, and the pH value is controlled at 6.5 to 7.5. Under such conditions, the reaction is carried out to generate a sodium acetate solution. When the density of the concentrated solution 1 is 1170kg·m-3, the liquid is discharged to obtain an evaporating liquid 1 and a preliminarily concentrated concentrated solution 1. The concentrated solution 2 is discharged when the density is 1230kg·m-3. In the recrystallization and drying stages, the recrystallization medium uses a mixed medium of deionized water and ethanol in a volume ratio of 1:2. The difference in polarity between water and ethanol is used to better control the crystals of sodium acetate during the dissolution and recrystallization process, thereby obtaining crystals with fine and uniform particle size. The crystals 2 obtained by centrifugation and drying are washed with deionized water and transported to a drying device for drying and dehydration. The drying device can use a fluidized bed dryer, first dried at 85°C for 15 minutes, and then continued to heat up to 125°C for drying for 20 minutes, and finally a high-purity sodium acetate product is obtained.

[0032] Reference Figure 2The embodiment of the present invention provides a sodium acetate production device, which includes: a reaction device 1, a primary evaporation device 2, a secondary evaporation device 3, a first crystallization device 4, a first centrifugal device 5, a second crystallization device 6, and a second centrifugal device 7. The output end of the reaction device 1 is connected to the primary evaporation device 2 through a delivery pipeline, the output end of the primary evaporation device 2 is connected to the secondary evaporation device 3 through a delivery pipeline, and the output end of the secondary evaporation device 3 is connected to the first crystallization device 4 through a delivery pipeline. The output end of the first crystallization device 4 is connected to the first centrifugal device 5 through a delivery pipeline, the output end of the first centrifugal device 5 is connected to the second crystallization device 6 through a delivery pipeline, and the output end of the second crystallization device 6 is connected to the second centrifugal device 7 through a delivery pipeline.

[0033] Working principle: acetic acid and sodium hydroxide are injected into the reaction device 1 in a ratio of 1:2 for reaction, the temperature is controlled at 50 degrees and the normal pressure is maintained, and the mixture is mixed by sufficient stirring. After the reaction, an acetic acid solution is generated, which is transported to the primary evaporation device 2 for concentration treatment, and then the concentrated solution 1 obtained after concentration is transported to the secondary evaporation tank 3 for further concentration treatment, and the concentrated solution 2 obtained after the secondary concentration is transported to the first crystallization device 4 for cooling and crystallization, and the crystals are separated by the first centrifugal device 5, and then transported to the second crystallization device 6 for recrystallization treatment, and finally separated again by the second centrifugal device 7 to obtain the final sodium acetate.

[0034] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A production process for sodium acetate, characterized in that, The method comprises reacting acetic acid and sodium hydroxide in a certain ratio at a certain temperature and pressure to generate a sodium acetate solution; The specific production steps of the sodium acetate solution are as follows: Step 1, reaction stage: prepare acetic acid solution and sodium hydroxide, and put them into the reaction kettle according to a certain ratio; Step 2: Reaction stirring: Turn on the stirring device of the reactor to allow the acetic acid and sodium hydroxide to be fully mixed and reacted; Step 3, evaporation and concentration stage: the liquid phase 1 obtained by the reaction is transported to evaporation tank 1 for primary evaporation and concentration to obtain concentrated liquid 1, and the concentrated liquid 1 is transported to evaporation tank 2 for secondary evaporation and concentration to obtain concentrated liquid 2; The 20% liquid sodium acetate in the concentrate 1 and the 25% liquid sodium acetate in the concentrate 2 are used as carbon sources for water treatment; Step 4, crystallization and centrifugal separation stage: the concentrated concentrate 2 is transported to the crystallizer 1 for cooling and crystallization; Step 5, centrifugal separation: conveying the crystallization mixture to a centrifuge for centrifugal separation to obtain a crystal and a mother liquor; Step 6, recrystallization and drying stage: transporting the crystal 1 to the crystallizer 2 for recrystallization; Step 7, centrifugal separation and drying: the recrystallization liquid is placed in a second centrifuge for centrifugal separation to obtain a second crystal.

2. A production process for sodium acetate according to claim 1, characterized in that, In the reaction stage, the temperature of the reactor is controlled at 50° C. and the pH value is controlled at 6.5 to 7.

5. Under such conditions, the reaction is carried out to generate a sodium acetate solution.

3. A production process for sodium acetate according to claim 1, characterized in that, When the density of the concentrated liquid 1 is 1170 kg·m-3, the liquid is drained to obtain the evaporated liquid 1 and the preliminarily concentrated concentrated liquid 1. When the density of the concentrated liquid 2 is 1230 kg·m-3, the liquid is drained.

4. A production process for sodium acetate according to claim 1, characterized in that, In the recrystallization and drying stages, the recrystallization medium is a mixed medium of deionized water and ethanol in a volume ratio of 1:

2. The difference in polarity between water and ethanol is utilized to better control the crystals of sodium acetate during the dissolution and recrystallization process, thereby obtaining crystals with fine and uniform particle size.

5. A production process for sodium acetate according to claim 1, characterized in that, The crystals obtained by centrifugal separation and drying are washed with deionized water and then transported to a drying device for drying and dehydration. The drying device can be a fluidized bed dryer. The crystals are first dried at 85° C. for 15 minutes, and then the temperature is continuously raised to 125° C. for drying for 20 minutes to finally obtain a high-purity sodium acetate product.

6. The production equipment used in the production process of sodium acetate according to any one of claims 1 to 5, characterized in that: include: A reaction device (1), a primary evaporation device (2), a secondary evaporation device (3), a first crystallization device (4), a first centrifugal device (5), a second crystallization device (6), and a second centrifugal device (7).

7. A sodium acetate production equipment according to claim 6, characterized in that, The output end of the reaction device (1) is connected to a primary evaporation device (2) via a delivery pipeline, the output end of the primary evaporation device (2) is connected to a secondary evaporation device (3) via a delivery pipeline, and the output end of the secondary evaporation device (3) is connected to a first crystallization device (4) via a delivery pipeline.

8. A production process for sodium acetate and production equipment thereof according to claim 7, characterized in that, The output end of the first crystallization device (4) is connected to a first centrifuge (5) via a conveying pipeline, the output end of the first centrifugal device (5) is connected to a second crystallization device (6) via a conveying pipeline, and the output end of the second crystallization device (6) is connected to a second centrifugal device (7) via a conveying pipeline.

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