Treatment system and method for recovering methylamine/ethylamine from amine-containing wastewater

A technology of recovery and treatment of ethylamine, which is applied in the purification/separation of amino compounds, organic chemistry, etc., can solve the problems of increased difficulty in sewage treatment, environmental pollution, air secondary pollution, etc., and achieve significant economic and social benefits and process flow Effects with simple, easy-to-operate controls

Pending Publication Date: 2020-11-20
魏毅宏
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, if the amination mother liquor is not recovered by methylamine / ethylamine, it will directly enter the wastewater treatment system or be discharged into the water body, which will cause environmental pollution, increase the difficulty of sewage treatment and waste resources, so effective treatment and recovery measures need to be taken
[0004] At present, most of the methylamine / ethylamine wastewater is treated by incineration in China, but the low-concentration methylamine / ethylamine aqueous solution itself cannot be burned, and a large amount of heat must be provided for its combustion; therefore, the combustion treatment method consumes a lot of energy and costs high; in addition, After the amination production wastewater is burned, harmful gases such as nitrogen dioxide, nitrogen monoxide, carbon dioxide, and carbon monoxide will be produced, which will cause secondary pollution to the air
[0005] In addition, other treatment methods such as steam stripping, chemical precipitation, complex extraction, ion exchange, and dimethylamine hydrochloride all have shortcomings such as high recovery costs, large investment and operating power consumption, and are difficult to process. Suitable for large-scale industrial production processing

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  • Treatment system and method for recovering methylamine/ethylamine from amine-containing wastewater
  • Treatment system and method for recovering methylamine/ethylamine from amine-containing wastewater

Examples

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Effect test

Embodiment 1

[0032] Embodiment 1: A kind of amination production wastewater treatment system

[0033] like figure 1 As shown: the amination production wastewater treatment system includes an amine gasification tower 1, a multi-stage condensation device 2, a multi-stage negative pressure absorption device 3 and a tail gas absorption tower 4 connected in sequence.

[0034] The amine gasification tower 1 is provided with a heating unit 11, a liquid distribution unit 12 and a reflux unit 13 in sequence from bottom to top; the heating unit 11 is heated by steam, and the heating temperature is 85-105°C; An atomizing nozzle is provided so that the atomized particle size is 100-1000 mm; a packing layer is provided at the bottom of the liquid distribution unit 12, and the packing is a conventional irregular packing, mainly stainless steel Raschig ring, Pall ring and stepped ring, etc., which are resistant to amine gas Corrosive materials; the lower part of the packing layer is equipped with a flus...

Embodiment 2

[0045] Embodiment 2: A kind of treatment method of amination production wastewater

[0046] The treated wastewater is the amination wastewater of D301 anion resin of an ion exchange resin enterprise. The pH of the amination wastewater is 8-9, and its organic components are mainly dimethylamine, methylal, methanol and the like after testing. Methylal is relatively stable to alkali. When heated together with dilute hydrochloric acid, it is easily decomposed into formaldehyde and methanol, and reacts with concentrated hydrochloric acid to generate methyl chloride, which normally exists in the form of formaldehyde in water. Detect a batch of production wastewater. The content of dimethylamine (testing standard: methylamine solution test HGT 2971-1999; determination of low-carbon fatty amine content GB / T 23961-2009) in wastewater is 0.71%, formaldehyde (testing standard: DB41T1425- 2017 Determination of Methylal Content in Gasoline (DB41T1425-2017) 0.15%, COD (Testing Standard: De...

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Abstract

The invention discloses a treatment system and method for recovering methylamine/ethylamine from amine-containing wastewater. The system comprises an amine gasification tower, a multi-stage condensation device, a multi-stage negative pressure absorption device and a tail gas absorption tower which are sequentially communicated. According to the method, filtered amination production wastewater flows into an amine gasification tower and is heated, and the heated wastewater is pumped to a liquid distribution unit and is atomized; the amine-containing steam in the mist-like liquid enters a multi-stage condensation device and is subjected to condensation treatment; the amine-containing gas in the amine-containing steam enters a multi-stage negative pressure absorption device; and water is sprayed into a tail gas absorption tower, the supplemented water is conveyed to the previous stage step by step, and collecting is completed until the solubility of the amine solution in the first-stage absorption tank of the multi-stage negative pressure absorption device is 10-20%. According to the invention, the treatment method is simple in technological process, easy to operate and control and capable of saving energy consumption; and through reasonable process connection and process parameter configuration, methylamine/ethylamine is fully recycled, the concentration is increased, seamless connection with other related production processes can be achieved, the purpose of cyclic and clean production is achieved, and economic benefits and social benefits are extremely remarkable.

Description

technical field [0001] The invention relates to the technical field of organic matter recovery, in particular to a treatment system and method for recovering methylamine / ethylamine from amine-containing wastewater. Background technique [0002] Methylamine / Ethylamine is an important chemical raw material, which is widely used in chemical industry, pesticide, medicine, rubber, leather and other organic chemical industries. It is easily soluble in water, and a large amount of amine-containing wastewater will be generated during its production and use. For example, in the production process of anion resins such as ion exchange resin 201*7 / D201 / D301, the resin white balls need to be aminated after chlorination. In the rubber accelerator industry, when PZ (zinc dimethyldithiocarbamate) adopts one-step or two-step method to produce raw material dimethylamine, when ZDC (zinc diethyldithiocarbamate) series produces raw material diethylamine Amination is also required. [0003] Ami...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C209/86C07C211/04C07C211/05
CPCC07C209/86C07C211/04C07C211/05
Inventor 魏毅宏魏源田建军刘杨陈宥霖
Owner 魏毅宏
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