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A kind of adipic acid crystallization system and online scar removal method thereof

A crystallization system and adipic acid technology are applied in the adipic acid crystallization system and the field of online scar removal, which can solve the problems of easy scarring and failure of crystallization to proceed smoothly.

Active Publication Date: 2021-09-14
CHONGQING HUAFON CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the working process of the crystallizer, the side wall of the equipment chamber is prone to scabbing to form an adhesion layer, forming salt scars, which gradually accumulate and eventually fill the entire compartment, resulting in the failure of crystallization to proceed smoothly

Method used

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  • A kind of adipic acid crystallization system and online scar removal method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] see figure 1 , is a specific example of adipic acid crystallization system. The adipic acid crystallization system includes a feed storage tank 1 , a crystallizer 2 , a negative pressure source 3 , and an emptying pipeline 4 . The inner space of the feed storage tank 1 is provided with a heating coil, and the heating coil uses steam as a heat medium. The crystallizer 2 is a vacuum evaporation crystallizer, which includes a first independent compartment 2a, a second independent compartment 2b, a third independent compartment 2c, a fourth independent compartment 2d, and a fifth independent compartment from upstream to downstream. 2e, the sixth independent compartment 2f, the seventh independent compartment 2g, the eighth independent compartment 2h, the ninth independent compartment 2i, the tenth independent compartment 2j, the eleventh independent compartment 2k, the twelfth independent compartment The chamber 21 is connected to each other by a siphon tube 5 between adj...

Embodiment 2

[0042] The online scar removal method of the first independent compartment, the second independent compartment, the third independent compartment and the fourth independent compartment of the adipic acid crystallization system described in Example 1, check each independent compartment of the crystallizer before scar removal The material passing through the siphon is normal and unobstructed. Raise the temperature of the adipic acid crystallization system including the feed storage tank to above 90-95°C in advance. Control the liquid level of each independent compartment in the crystallizer in advance to make buffer preparation for scar removal. The central control closes the vacuum regulating valve of the first five chambers, closes the second pipeline on site, and replaces it with hot water. Reduce the feed from 27m³ / h to 25m³ / h, and slowly break the vacuum of the first five chambers one by one from the first independent chamber, and the vacuum gradient of the first independe...

Embodiment 3

[0044] The online scar removal method of the fifth independent compartment, the sixth independent compartment, the seventh independent compartment, and the eighth independent compartment of the adipic acid crystallization system described in Example 1, the scar removal work will be carried out according to the second embodiment Make preparations and check that the siphon tubes in each independent compartment of the crystallizer are normal and unobstructed before removing the scars. Raise the temperature of the adipic acid crystallization system including the feed storage tank to above 90-95°C in advance. Control the liquid level of each independent compartment in the crystallizer in advance to make buffer preparation for scar removal. The central control closes the vacuum regulating valves in the first 8 chambers, and the second pipeline on site is closed and replaced with hot water. Then return 1.5-2m³ / h of 90°C high-temperature mother liquor through the second pipeline. Re...

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Abstract

An adipic acid crystallization system, including a feed storage tank, a crystallizer, a negative pressure source, and an emptying pipeline. The crystallizer is a vacuum evaporation crystallizer, which includes the first, second, third, and third The fourth, fifth, sixth, seventh, eighth, ninth, tenth, eleventh, and twelfth independent compartments, adjacent independent compartments are connected by siphon tubes, and each independent compartment is separated by vapor phase The tube is connected to a negative pressure source, so that the vacuum degree of each independent compartment is controllable. The upstream end of the exhaust pipeline is sealed, and the downstream end is provided with a second valve. The bottom of each independent compartment passes through the exhaust valve and the exhaust tube respectively. The feed storage tank is connected to the first independent compartment through the feed pipeline, and the twelfth independent compartment is connected to the discharge pump through the siphon. The invention has simple structure and convenient operation, can remove adipic acid scars generated in each independent compartment online without parking or shutting down work, effectively guarantees the production efficiency of the enterprise, and reduces the operating cost of the crystallization system.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to an adipic acid crystallization system and an online scar removal method thereof. Background technique [0002] As an intermediate in organic synthesis, adipic acid is mainly used in the synthesis of nylon 66, polyurethane and plasticizers, and can also be used in the production of high-grade lubricants, food additives, pharmaceutical intermediates and other products. [0003] At present, in the chemical production process, a vacuum horizontal evaporation crystallizer is often used to crystallize adipic acid. Multiple compartments are set in the vacuum horizontal evaporation crystallizer. By controlling the vacuum degree of each chamber in the crystallizer, the solution in each chamber is adiabatically evaporated, cooled, and concentrated under a certain vacuum degree, so that the solution reaches a supersaturated state. Nuclei are generated and grown in supersaturated solution t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D9/02B01D3/10C07C51/43C07C55/14
CPCB01D3/10B01D9/0022B01D9/0059C07C51/43C07C55/14
Inventor 陈恩之赵风轩谢毅于彬董成岺刘天宇王旭徐令杨建新
Owner CHONGQING HUAFON CHEM