The preparation method of copper ethylenediamine solution

Abstract

The invention relates to a preparation method of copper ethylenediamine solution. Its features are: dissolving 230-250g of analytically pure copper sulfate in a beaker filled with hot pure water, heating to boiling, stirring continuously, using an infusion set to control the flow rate, adding 106-115ml of concentrated ammonia water, standing still to make the precipitation drop; Wash the precipitate with the float method, add ice-water mixture to the precipitate to set the volume to 1500ml, cool to 10°C, add 800ml of cold 20% sodium hydroxide, control the speed with an infusion device, and wash the precipitated hydrogen with pure water by the tilting float method Copper oxide, until the lotion is colorless with a phenolphthalein indicator; add ice water to the pasty precipitate to 500ml, cool to 10°C, add 148-160ml of 70% ethylenediamine, and use an infusion set to control the adding speed of 40ml / min, put it in a brown bottle with a stopper, after standing for 16-24 hours, filter the precipitate, and calibrate. The beneficial effects of the present invention are as follows: 1. Time for configuration can be saved, and only 2 people and 2 working days are needed to configure 24 L; 2. The yield of copper ethylenediamine solution is increased to over 80%; 3. The success rate of configuration is 100%.

Description

technical field [0001] The invention relates to a preparation method of copper ethylenediamine solution. Background technique [0002] At present, the mensuration of GB / T 1548-2004 pulp viscosity, the preparation method of copper ethylenediamine solution mainly has the following problems: [0003] The preparation time of copper ethylenediamine solution: For example, it takes 2 people and 3 working days to prepare 24L. Because it needs three times of cooling when preparing the copper ethylenediamine solution; after the copper hydroxide is produced, the settling speed in the washing process is slow and takes a long time. [0004] The yield of the copper ethylenediamine solution is low: the yield is generally 50-60%. Mainly due to the incomplete conversion of copper ions. [0005] The success rate of preparation of copper ethylenediamine solution is low: the success rate is 70% to 80%, because the prepared copper ethylenediamine solution has a strict concentration range, whi...

AI Technical Summary

Problems solved by technology

[0003] The preparation time of copper ethylenediamine solution: for example, it takes 2 people and 3 working days to prepare 24L

Because it needs three times of cooling when preparing the copper ethylenediamine solution; after the copper hydroxide is generated, the sedimentation rate in the washing process is slow and takes a long time.

[0004] The preparation rate of copper ethylenediamine solution is low: the yield is generally 50-60%

Mainly due to incomplete conversion of copper ions

[0005] The success rate of preparation of copper ethylenediamine solution is low: the success rate is 70% to 80%, because the prepared copper ethylenediamine solution has a strict concentration range, which requires copper ion concentration M2=1.00±0.02mol / L, ethylenediamine Ratio to copper ions R=2.00±0.04