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A method and system for recovering materials from crystallization feed liquid

A technology for recovering materials and feed liquids, which is applied to the general layout of crystallization devices, crystallization separation, solution crystallization, etc., can solve the problems of heat-sensitive product deterioration appearance, low product recovery rate, high recovery cost, etc., achieve good economic benefits, reduce Effects of environmental pollution and improvement of recovery rate

Active Publication Date: 2018-10-19
CHONGQING UNISPLENDOUR CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a method and system for recovering materials from the crystallization feed liquid, which is used to solve the problems of high product recovery costs, low product recovery, and heat-sensitive products in the prior art. Problems such as deterioration and poor appearance

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  • A method and system for recovering materials from crystallization feed liquid
  • A method and system for recovering materials from crystallization feed liquid
  • A method and system for recovering materials from crystallization feed liquid

Examples

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Embodiment 1

[0038] This embodiment is example with anilinoacetonitrile:

[0039] Anilinoacetonitrile belongs to the dye intermediates, used for the production of indigo, slightly soluble in water, easily soluble in ethanol and acetone, with a melting point of 40°C.

[0040] figure 2 Shown is a schematic structural diagram of the recycling system of this embodiment.

[0041] A recovery method for anilinoacetonitrile product, comprising the following steps:

[0042] 1) Transfer the anilinoacetonitrile sand blasting solution into the crystallization tank 1 (capacity 15000L), lower the temperature to 30°C, and the stirring speed of the crystallization tank 1 is 15r / min. In this step, the volume of liquid in the crystallization tank 1 is relatively large, reaching 15000L. Therefore, if it is cooled to a lower temperature, energy consumption will be increased, thereby increasing costs. Cooling to 30°C can make the products in the sanding liquid A large number of precipitates from the soluti...

Embodiment 2

[0066] This embodiment takes yellow blood salt sodium as an example, and its recovery system is as follows: figure 2 As shown, the raw material liquid of the yellow blood salt sodium product that is separated by evaporation enters the crystallization kettle 1, and the stirring speed of the feed liquid in the crystallization kettle 1 is 40-70r / min, and the stirring speed of the present embodiment is 50r / min, slowly cooling to 35°C, enter the solid-liquid separation equipment 2 for solid-liquid separation, and the separated mother liquor enters the thickener 3 for sedimentation and separation. The concentrated liquid in the lower layer of the thickener 3 is transferred to the crystallization kettle 1 through the concentrated liquid transfer pump 5, mixed with the normal batch crystallization feed liquid, and then enters the solid-liquid separation device 2 for centrifugation, and the clear liquid overflowed from the upper layer of the thickener 3 enters the The clear liquid tra...

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Abstract

The invention provides a method and a system for recovering a material from a crystallization feed liquid. The method comprises the following steps: 1) inputting the crystallization feed liquid into a crystallization kettle, and heating or cooling under the condition of stirring; 2) carrying out solid-liquid separation on the feed liquid obtained in the Step 1) so as to obtain a solid product and mother liquor; 3) transferring the mother liquor obtained in the Step 2) into sedimentation equipment, carrying out gravity settling separation on the mother liquor under the conditions of stirring and heating or cooling, letting the lower-layer concentrated liquor flow back into the crystallization kettle in the Step 1), letting 0-100 v / v% of supernatant liquor flow back into the crystallization kettle in the Step 1), and discharging the rest of supernatant liquor as spent liquor. The system comprises the crystallization kettle, solid-liquid separation equipment and a thickener which are successively connected. An upper outlet and a lower outlet of the thickener are both connected to an inlet of the crystallization kettle. A spent liquor outlet is arranged between the upper outlet of the thickener and the inlet of the crystallization kettle. By the method and the system, product recovery rate is effectively raised, energy consumption is obviously reduced, and environmental pollution is reduced.

Description

technical field [0001] The invention relates to the field of material recovery, in particular to a method and system for recovering material from crystallization feed liquid. Background technique [0002] During the material production process, crystallized feed liquid will be produced, which contains some products and needs to be recycled. Different recycling methods have obvious differences in recovery rate, recycling cost, recycled product quality and appearance. Some products need heating and other measures during recycling. On the one hand, it consumes a lot of heat energy. On the other hand, heating will cause heat-sensitive substances to deteriorate or change their appearance, which will affect product quality and appearance. For non-heat-sensitive substances, the existing recovery methods require more equipment, higher energy consumption, and low recovery rates. [0003] For heat-sensitive substances, taking anilinoacetonitrile as an example, the current recovery me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D9/02
CPCB01D9/0013B01D9/0059B01D2009/0086
Inventor 徐代行郑道敏丁永良韦异勇张正伟幸勇李廷云
Owner CHONGQING UNISPLENDOUR CHEM