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Imidazolidine tail liquid treatment process

A treatment process and imidazolidine technology are applied in the field of tail liquid treatment technology produced in the production of imidazolidine to achieve the effects of reducing production cost, saving production water and increasing output

Active Publication Date: 2015-10-07
NINGXIA DONGWU AGROCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a tail liquid treatment process for the production of imidazolidine in order to solve the problem of waste liquid treatment produced in the imidazolidine production process

Method used

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  • Imidazolidine tail liquid treatment process

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Experimental program
Comparison scheme
Effect test

Embodiment

[0024] 1. Put 20 tons of imidazolidine washing waste water (the concentration of imidazolidine is 2-2.5%, the concentration of sulfate mixture is 5-15%), and then pass it into the first effect evaporator tank 40-60 ℃, and the second effect evaporator tank 50-80 ℃ , four-effect evaporator 80-95 ℃, three-effect evaporator 75-90 ℃ vacuum concentration, to obtain about 2 tons of concentrated solution with an imidazolidine concentration of 20-25% and about 18 tons of distilled water.

[0025] 2. Cool about 2 tons of concentrated liquid with an imidazolidine concentration of 20-30% to 20-35°C for crystallization, and separate by a centrifuge to obtain 400-600 kg of imidazolidine crystals.

[0026] 3. Concentrate the mother liquor centrifuged out of imidazolidine crystals through four-effect evaporation. At this time, the concentration of imidazolidine in the mother liquor of about 1500kg of wastewater is very small, and the main components in the liquid are ammonium sulfate and sodiu...

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Abstract

The invention belongs to the technical field of chemical industry, and particularly relates to an imidazolidine tail liquid treatment technology for producing imidazolidine. In order to achieve the target, the treatment technology adopts the following technical schemes: concentrating imidazolidine washing wastewater by adopting a four-effect evaporation concentration technology, and then extracting imidazolidine from the concentrated liquid after cooling; concentrating the wastewater after the imidazolidine is extracted by adopting the four-effect evaporation mode, and then carrying out inner cycle concentration on the concentrated liquid; and cooling to extract and separate a sulfate mixture. The imidazolidine tail liquid treatment technology has the beneficial effects that zero emission of production is achieved, the yield is improved, the production cost is reduced, and production water supply is saved.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a process for treating tail liquid produced in the production of imidazolidine. Background technique [0002] The production process of imidazolidine is relatively complicated, with high technical content and large amount of wastewater discharge. There are also certain dangers in the production process, mainly by the reaction of dihydroamine and ammonium nitrate to generate guanidine nitrate. Guanidine nitrate is dehydrated with concentrated sulfuric acid at low temperature to generate nitroguanidine. There is a large amount of dilute sulfuric acid in the reaction process, and the dilute sulfuric acid per ton of product is about 12 tons, so the treatment cost is relatively high. Finally, nitroguanidine and ethylenediamine are polymerized into imidazolidine, and liquid caustic soda is used to adjust the pH during the reactant process, which is very harmful t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C01C1/24C01D5/00C07D233/52
Inventor 吴根龙陈德元
Owner NINGXIA DONGWU AGROCHEM