Continuous crystallization process of succinic acid

A succinic acid and process technology, applied in the field of succinic acid crystallization, can solve the problems of uneven crystal grain size, low output rate, low purity, etc., to reduce cost expenditure, improve output rate, and achieve uniform crystal grain size. Effect

CN114790138APending Publication Date: 2022-07-26浙江贝诺机械有限公司
2 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2022-07-26

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention relates to the technical field of succinic acid crystallization, in particular to a continuous crystallization process of succinic acid. The method comprises the following steps: preparing a succinic acid stock solution, and concentrating; injecting the stock solution into a first vacuum crystallizer, adjusting the temperature, performing evaporation and continuous cooling crystallization, then discharging, and injecting the stock solution into a centrifugal machine for centrifugal separation of primary crystals; the primary mother liquor is subjected to evaporation and continuous cooling crystallization in a second vacuum crystallizer, then primary crystals and secondary crystals are discharged and filtered through activated carbon, and finally an air flow type dryer is adopted for drying; in the continuous crystallization process of succinic acid, the succinic acid stock solution is subjected to primary crystallization and secondary crystallization through two times of continuous cooling crystallization work, the produced crystals have good granularity, the yield is 70% or above, the purity of the crystals is 99% or above, and the granularity of the crystals is uniform.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to the technical field of succinic acid crystallization, in particular to a process for continuous crystallization of succinic acid. Background technique

[0002] Crystallization refers to the separation process of precipitating solid crystals from solution, vapor or melt. The crystallization process is an important operation unit in the chemical process and an important link to complete the generation of chemical products. Crystallization is achieved by cooling or removing part of the solvent. In the generation, this purpose is mainly achieved by the crystallizer, and the crystal product suitable for the requirements is obtained.

[0003] In the existing succinic acid crystallization process, firstly, the succinic acid solution is injected into the crystallizer to carry out a single-pass crystallization operation. In this way, the crystal particles are small, the purity is low, and the overall content is small; the second is to ...

Examples

Embodiment 1

[0022] 1. Prepare succinic acid stock solution and concentrate to 8%, then preheat to 85℃ for use;

[0023] 2. Turn on the vacuum pump to draw out the air in the No. 1 vacuum crystallizer and the No. 2 vacuum crystallizer to form a vacuum, then inject the stock solution into the No. 1 vacuum crystallizer, adjust the temperature to 100 °C, and then carry out the evaporation work. After the evaporation work, the succinic acid stock solution temperature dropped to 65°C;

[0024] 3. After the evaporation step, carry out continuous cooling and crystallization, the temperature is -5 °C, and crystallize after circulating for 4 hours. Then the material is discharged into the slurry tank for stirring, and then injected into the centrifuge to centrifuge the crystals. After the first crystal separation, the particle volume filtration work is carried out. , the primary crystals that are smaller and do not meet the specifications are heated and stirred with the primary mother liquor, the h...

Embodiment 2

[0028] 1. Prepare the succinic acid stock solution and concentrate it to 10%, then preheat to 80°C for later use;

[0029] 2. Turn on the vacuum pump to draw out the air in the No. 1 vacuum crystallizer and the No. 2 vacuum crystallizer to form a vacuum, then inject the stock solution into the No. 1 vacuum crystallizer, adjust the temperature to 95 °C, and carry out the evaporation work. After the evaporation work, the succinic acid stock solution temperature dropped to 60°C;

[0030] 3. After the evaporation step, carry out continuous cooling and crystallization, the temperature is -3 °C, and crystallize after circulating for 4.5 hours, and then the material is discharged into the slurry tank for stirring, and then injected into the centrifuge to separate the crystals once. Work, heat and stir the small primary crystals that do not meet the specifications with the primary mother liquor, the heating temperature is 95 °C, and after stirring for 30 minutes, the temperature drops...

Embodiment 3

[0034] 1. Prepare the succinic acid stock solution and concentrate it to 12%, then preheat to 75°C for later use;

[0035] 2. Turn on the vacuum pump to draw out the air in the No. 1 vacuum crystallizer and the No. 2 vacuum crystallizer to form a vacuum, then inject the stock solution into the No. 1 vacuum crystallizer, adjust the temperature to 90 °C, and carry out the evaporation work. After the evaporation work, the succinic acid stock solution temperature dropped to 55°C;

[0036] 3. After the evaporation step, carry out continuous cooling and crystallization, the temperature is 0 °C, and crystallize after 5 hours of circulation, and then the material is discharged into the slurry tank for stirring, and then injected into the centrifuge for centrifugation. The primary crystals that do not meet the specifications are heated and stirred with the primary mother liquor at a heating temperature of 90 °C. After stirring for 30 minutes, the temperature is lowered to 75 °C, and th...