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Recycling system and recycling method for waste liquor produced in separation and purification of organically synthesized feed liquid

A technology of separation and purification and organic synthesis, which is applied in the field of chemical industry and can solve the problems of separation and purification operation yield and purity contribution, etc.

Inactive Publication Date: 2014-12-03
CHONGQING UNISPLENDOUR CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

China's authorized patent CN1331844C discloses a preparation process of iminodiacetonitrile, which has a final yield of more than 90% and a purity of more than 98%. According to its examples, it can be seen that the improvement of its final yield and purity mainly depends on Due to the control of the synthesis reaction conditions, the final separation and purification operation does not contribute to the yield and purity, because it uses conventional separation and purification devices and methods

Method used

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  • Recycling system and recycling method for waste liquor produced in separation and purification of organically synthesized feed liquid
  • Recycling system and recycling method for waste liquor produced in separation and purification of organically synthesized feed liquid
  • Recycling system and recycling method for waste liquor produced in separation and purification of organically synthesized feed liquid

Examples

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Embodiment 1

[0105] Refer to the following Figure 8-11 Preferred embodiments of the present invention are described in detail. The organic synthesis material liquid of iminodiacetonitrile in this example is obtained according to the production method of patent CN1331844C; the sulfuric acid added below is used for the neutralization of ammonia in the reaction system. The operation of not specifying specific conditions in the embodiment is carried out according to conventional operating conditions.

[0106] The material extracted from the iminodiacetonitrile reactor (material code: FED1, wherein the iminodiacetonitrile content is 300g / L, temperature 65°C, pH=7.0) is dissolved in 10.5m 3 The speed of / h is sent continuously in the batching tank 5, and the material that is sent continuously simultaneously also includes: product centrifugal filter cake washing liquid and secondary thickener underflow mixed solution (material code name: FED 2; wherein iminodiacetonitrile content is 50g / L, te...

Embodiment 2

[0117] Refer to the following Figure 8-11 Preferred embodiments of the present invention are described in detail. The organic synthesis material liquid of iminodiacetonitrile in this example is obtained according to the production method of patent CN1331844C; the sulfuric acid added below is used for the neutralization of ammonia in the reaction system. The operation of not specifying specific conditions in the embodiment is carried out according to conventional operating conditions.

[0118] The material extracted from the iminodiacetonitrile reaction system (material code: FED1, wherein the iminodiacetonitrile content is 300g / L, the temperature is 65°C, the pH=7.0) is 10.5m 3 The rate of / h is continuously sent to the batching tank 5. At the same time, the continuously fed materials also include: the product centrifugal filter cake lotion mixed with the bottom flow of the secondary thickener, and the clear liquid obtained after filtration (material code: FED 2; the conten...

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Abstract

The invention relates to a recycling system and a recycling method for waste liquor produced in separation and purification of an organically synthesized feed liquid, and belongs to the field of chemical engineering. The recycling system for the waste liquor comprises a filter device, a desalting device and a membrane concentrating device which are arranged from the front to the rear in sequence, or the filter device is replaced with a filtrate collecting slot, wherein the filter device is used for filtering and collecting the waste liquor; the filtrate collecting slot is used for stewing and collecting the waste liquor; the desalting device is used for desalting the collected waste liquor; the membrane concentrating device is used for concentrating a liquid which is desalted by virtue of the desalting device; and the desalting device is preferably an electrodialysis device. According to the recycling system and the recycling method, a membrane separating and concentrating technology, an electrodialysis technology and the like are comprehensively utilized to separate and purify the organically synthesized feed liquid, and the produced waste liquor is sufficiently recycled, the separating and purifying efficiency and the purity and the yield of products are improved, discharge of the waste liquor is reduced, the production industrialization is strong and the cost is low, and thus, the recycling system and the recycling method are especially suitable for being applied in production of iminodiacetonitrile.

Description

technical field [0001] The invention aims at the field of chemical industry, and relates to a recycling system and a recycling method for waste liquid produced in the separation and purification of organic synthesis feed liquid. Background technique [0002] Organic synthesis reaction is a main way for the chemical industry to obtain the target product, and the reaction feed liquid system after the reaction is mainly composed of the target product, residual raw materials and by-products. In industry, how to separate and purify the reaction feed liquid to obtain the target product with high efficiency and high purity, and recycle the waste liquid and waste residue to the maximum extent are closely related to the efficiency and cost of industrial production. Moreover, compared with large-scale industrial production, the latter's parameter control and uniformity control of the reaction system are also more difficult. Therefore, how to design a system that can efficiently separ...

Claims

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Application Information

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IPC IPC(8): C02F9/02C02F9/06B01D9/02B01D36/00B04B5/10C07C253/34C07C255/24C01C1/24
CPCY02A20/124
Inventor 韦异勇徐征覃玉芳耿明刚金海琴刘丹
Owner CHONGQING UNISPLENDOUR CHEM
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