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Preparation method of cuprous thiocyanate

A technology of cuprous thiocyanate and copper sulfate, applied in the direction of thiocyanate, chemical instruments and methods, water/sewage multi-stage treatment, etc., can solve the problem of poor whiteness and fineness of cuprous thiocyanate, which affects the actual product application, complex components of desulfurization waste liquid, etc., to achieve the effect of improving product whiteness and better color

Active Publication Date: 2021-11-09
雷耐长兴新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing technology uses desulfurization waste liquid as the source of thiocyanate, and by adding copper ions, divalent copper is reduced to monovalent copper under the reducing conditions of sulfur dioxide or carbon monoxide, and then the precipitation of cuprous thiocyanate is formed. The process conditions are simple , but due to the complex composition of the desulfurization waste liquid, the whiteness and fineness of the prepared cuprous thiocyanate are poor, which affects the actual application of the product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A preparation method for cuprous thiocyanate, comprising the following steps:

[0028] S1. Add an adsorbent to the naturally settled desulfurization waste liquid, the amount of the adsorbent added is 3% of the weight of the desulfurization wastewater, the adsorption temperature is 55°C, and the adsorption time is 40min. After the adsorption is completed, filter to obtain pretreated Desulfurization waste liquid;

[0029] S2. Prepare copper sulfate as a saturated solution at 50°C, and mix and stir with the pretreated desulfurization waste liquid at a mixing volume ratio of 1:2, and add a saturated solution of sodium sulfite drop by drop under stirring conditions, and the The molar ratio of copper sulfate to the sulfite is 1:0.6. After the dropwise addition, continue to stir and react for 10 minutes, filter, wash with hot saturated sulfite solution and deionized water successively, and dry to prepare;

[0030] The preparation method of described adsorbent comprises the fo...

Embodiment 2

[0035] A preparation method for cuprous thiocyanate, comprising the following steps:

[0036] S1. Add an adsorbent to the naturally settled desulfurization waste liquid, the amount of the adsorbent added is 3% of the weight of the desulfurization waste water, the adsorption temperature is 55°C, and the adsorption time is 40min. After the adsorption is completed, filter to obtain pretreated Desulfurization waste liquid;

[0037]S2. Prepare copper sulfate as a saturated solution at 50°C, add polynaphthalene sulfonic acid sodium salt with a final concentration of 0.5wt.%, and mix it with the pretreated desulfurization waste liquid at a mixing volume ratio of 1:2 Stir, add a saturated solution of sodium sulfite drop by drop under stirring conditions, the molar ratio of the copper sulfate to the sulfite is 1:0.6, continue stirring for 10 minutes after the addition is complete, filter, and successively add hot sulfurous acid Washed with saturated salt solution and deionized water, ...

Embodiment 3

[0043] A preparation method for cuprous thiocyanate, comprising the following steps:

[0044] S1. Add an adsorbent to the naturally settled desulfurization waste liquid, the amount of the adsorbent added is 3% of the weight of the desulfurization wastewater, the adsorption temperature is 55°C, and the adsorption time is 40min. After the adsorption is completed, filter to obtain pretreated Desulfurization waste liquid;

[0045] S2. Prepare copper sulfate as a saturated solution at 50°C, add dodecylbenzenesulfonate sodium salt with a final concentration of 0.5wt.%, and mix it with the pretreated desulfurization waste liquid at a volume ratio of 1: 2 Mix and stir, add the saturated solution of sodium sulfite drop by drop under the condition of stirring, the molar ratio of the copper sulfate and the sulfite is 1:0.6, continue to stir and react for 10min after the dropwise addition, filter, and then heat Prepared by washing with saturated sulfite solution and deionized water, and ...

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Abstract

The invention provides a preparation method of cuprous thiocyanate, and belongs to the technical field of desulfurization waste liquid recovery treatment. The preparation method comprises the steps that firstly, an adsorbent is added into desulfurization waste liquid for adsorption, pretreated desulfurization waste liquid is obtained, a copper sulfate solution, the pretreated desulfurization waste liquid and a sulfite solution are mixed and filtered, and cuprous thiocyanate is obtained; the adsorbent is a nitrogen-doped graphene modified mesoporous carbon material prepared by taking micelle particles formed by a PS-b-PEO block copolymer as a template and ethanediamine as a modifier; zinc metal loading is performed, and in-situ hydrothermal synthesis is performed by taking 5-aminoisophthalic acid and cyanuric chloride as ligands to obtain a zinc core metal organic framework derived mesoporous carbon material; according to the preparation method, the whiteness of the product can be improved, so that the product has better color when being applied to paint with bright color and white building coating; application characteristics such as dispersity and oil absorption of the product are improved, so that the product is more stable in a target marine paint product, and the antifouling period is longer.

Description

technical field [0001] The invention relates to the technical field of recovery and treatment of desulfurization waste liquid, in particular to a method for preparing cuprous thiocyanate. Background technique [0002] The pre-contained ammonia desulfurization process has been widely used in the desulfurization of coke oven gas in the coking industry in recent years. The ammonia contained in the gas is used as the alkali source, and the cobalt phthalocyanine (PDS) compound is used as the desulfurization and decyanine catalyst. The operation cost is low, the investment is small, the process operation is simple, the desulfurization and decyanation efficiency is high, and no external alkali source is needed. It is a desulfurization process commonly used in the coking industry and has achieved good results. [0003] However, due to the side reactions in the desulfurization process, the desulfurization process generates auxiliary salts such as ammonium thiocyanate, ammonium thiosu...

Claims

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Application Information

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IPC IPC(8): C01C3/20C02F9/02C02F1/28B01J20/22B01J20/30C02F103/18
CPCC01C3/20B01J20/20B01J20/226C02F1/288C02F2103/18C02F1/001
Inventor 冯侠
Owner 雷耐长兴新材料有限公司
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