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A kind of wastewater treatment method produced by thiosemicarbazide

A technology of thiosemicarbazide and wastewater treatment, which is applied in natural water treatment, water/sewage treatment, water/sewage multi-stage treatment, etc., can solve problems such as improper wastewater treatment, and achieve high utilization rate, high resource utilization rate, and energy saving cost effect

Active Publication Date: 2020-06-16
山西瑞赛科环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the problem of improper wastewater treatment in the production process of thiosemicarbazide in the prior art, the present invention provides a wastewater treatment method that is more friendly to the environment, has a high utilization rate of resources, is simple to operate, and is economical and environmentally friendly

Method used

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  • A kind of wastewater treatment method produced by thiosemicarbazide
  • A kind of wastewater treatment method produced by thiosemicarbazide

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Treat 1 ton of waste water produced by thiosemicarbazide, and detect the contents of each component as follows: ammonium chloride: 18%; ammonium thiocyanate: 12%, thiosemicarbazide 3.0%, and dithiocarbazone 1.0%.

[0040] Its wastewater treatment method comprises the following steps:

[0041] S1', decolorization: add 1 kg of activated carbon, stir at 20-50°C for 1.5 hours, filter, and carry out subsequent operations on the filtrate, activated carbon can be used mechanically for 2-3 times.

[0042] S1. Preliminary concentration: 530 kg of water is removed by evaporation and concentration. At this time, a large amount of ammonium chloride crystals are precipitated. When the content of ammonium thiocyanate in the water phase is monitored to be 28-45%, the first concentration is completed, and 180 kg of mixed crystals are separated, and the remaining liquid is the mother liquor. . The evaporated condensate in this step can be used as production process water for preparing ...

Embodiment 2

[0050]Treat 1 ton of waste water produced by thiosemicarbazide, and detect the contents of each component as follows: ammonium chloride: 17%; ammonium thiocyanate: 10%, thiosemicarbazide 2.7%, and dithiocarbazone 0.8%.

[0051] Its wastewater treatment method comprises the following steps:

[0052] S11', decolorization: add 1 kg of activated carbon, stir at 20-50°C for 1 hour, filter, and carry out subsequent operations on the filtrate, the activated carbon can be used mechanically for 2-3 times.

[0053] S11. Preliminary concentration: 420 kg of water is removed by evaporation and concentration. At this time, a large amount of ammonium chloride crystals are precipitated. When the content of ammonium thiocyanate in the water phase is monitored to be 28-45%, the first concentration is completed, and 150 kg of mixed crystals are separated, and the remaining liquid is the mother liquor. . The evaporated condensate in this step can be used as production process water for preparin...

Embodiment 3

[0061] Treat 1 ton of waste water produced by thiosemicarbazide, and detect the contents of each component as follows: ammonium chloride: 23%; ammonium thiocyanate: 15%, thiosemicarbazide 3.2%, and dithiocarbazone 1.1%.

[0062] Its wastewater treatment method comprises the following steps:

[0063] S1. Preliminary concentration: 600 kg of water is removed by evaporation and concentration. At this time, a large amount of ammonium chloride crystals are precipitated. When the content of ammonium thiocyanate in the water phase is monitored at 28-45%, the first concentration is completed, and 190 kg of mixed crystals are separated, and the remaining liquid is the mother liquor. . The evaporated condensate in this step can be used as production process water for preparing ammonium thiocyanate solution, rinsing products, etc.

[0064] S2. Extraction of thiosemicarbazide: at normal temperature, fully mix the mixed crystals with 150 kg of methanol, separate 162 kg of ammonium chlorid...

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Abstract

The invention discloses a thiosemicarbazide production waste water treatment method. The property differences of all ingredients in the waste water are reasonably utilized; mixed crystals and mother liquid are primarily concentrated and separated; thiosemicarbazide is leached from the mixed crystals by either methanol or ethanol; ammonium chloride crystals are separated out; dithiobiurea byproducts are extracted from the mother liquid by using organic solvents insoluble with water; the obtained water phase is mainly a ammonium thiocyanate solution; a few existing ingredients in a reaction system exist; the materials can be used for thiosemicarbazide production again. In the thiosemicarbazide production waste water treatment method disclosed by the invention, each ingredient in the waste water can be recovered; the industrial waste water treatment method with the advantages with environment-friendly effect, very high resource utilization rate, simple operation, economic performance andenvironment protection is provided.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a method for treating wastewater produced by thiosemicarbazide. Background technique [0002] Thiosemicarbazide, also known as thiosemicarbazide or thiosemicarbazide, can be used as an intermediate of medicine and pesticide, and it is also a rodenticide itself. [0003] CN96114284.7 has introduced a kind of method of solvent method synthetic thiosemicarbazide, reacts under weakly acidic condition in aqueous phase with ammonium thiocyanate, potassium thiocyanate, hydrazine hydrate, then carries water with toluene, rearranges and then water The toluene is taken out by the steam, and the target product is obtained after post-treatment. This method has many steps and is cumbersome to operate. The synthesis process consumes a large amount of toluene, which is an organic solvent, causing certain potential safety hazards; secondly, there is no treatment method for the wastewater gene...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C01C1/16C07C337/06C02F103/36
CPCC01C1/164C02F1/04C02F1/26C02F1/283C02F9/00C02F2103/36C07C337/06
Inventor 曹阳崔健于建福朱建强张董平孙潜赵相寅周庆冯启明
Owner 山西瑞赛科环保科技有限公司
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