Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A method for refining thiocyanate by combined membrane method

A thiocyanate and combined membrane technology, applied in thiocyanate and other directions, can solve problems such as affecting the use effect of downstream users, affecting product purity, appearance, etc., to achieve easy intelligent control and automatic operation, and realize intelligent control and automatic operation. , versatility and applicability

Active Publication Date: 2015-12-02
张家港燎原环保科技有限公司 +1
View PDF2 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It not only affects the purity, appearance and other indicators of the product, but also affects the use effect of downstream users

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1. The ammonium thiocyanate provided by a certain company is off-white in appearance, with a content of 96.5%, of which ammonium sulfate content is 2.3%. 500 kg of this product was dissolved with 500 liters of deionized water to obtain a nearly colorless aqueous solution. After testing, the ammonium thiocyanate content in the solution was 48.5%, and the ammonium sulfate content was 1.1%.

[0027] 2. Filter the above solution through a plate and frame filter press with a 0.27 micron microfiltration membrane to remove suspended particles.

[0028] 3. The above-mentioned permeate is further treated with an ultrafiltration membrane to remove finer impurity particles and macromolecule dissolved substances. The filtrate is clear and transparent, which meets the water inlet standard of nanofiltration operation. The process conditions of the ultrafiltration treatment are: the ultrafiltration membrane adopts hollow fiber ultrafiltration membrane or other ultrafiltration membra...

Embodiment 2

[0035] 1. The ammonium thiocyanate provided by a certain company has a dark green appearance and a content of 75%, including 20% ​​ammonium sulfate and 3% ammonium thiosulfate. Add 200 liters of deionized water to 500 kg of this product and raise the temperature to 70°C to dissolve as much solid as possible. After being cooled to room temperature, filter to obtain 100 kg of dark green crystals containing ammonium sulfate and ammonium thiosulfate and 600 kg of dark green filtrate. Add 3 kilograms of gacs in the filtrate and carry out decolorization operation, obtain 600 kilograms of light green filtrates, after testing, composition is as follows, ammonium thiocyanate 62%, ammonium sulfate 4%, ammonium thiosulfate 2.5%. Add 100 kilograms of deionized water to dilute the above-mentioned filtrate to obtain 700 kilograms of solution, the composition is as follows: ammonium thiocyanate 52%, ammonium sulfate 3%, ammonium thiosulfate 2%.

[0036] 2, above-mentioned solution is carrie...

Embodiment 3

[0038] 1. The sodium thiocyanate provided by a certain company has an off-white appearance and a content of 95.7%, including 2.1% sodium sulfate and 0.9% sodium thiosulfate. 500 kg of this product was dissolved with 500 liters of deionized water to obtain a nearly colorless aqueous solution. After testing, the sodium thiocyanate content in the solution was 48.0%, the sodium sulfate content was 1.1%, and the sodium thiosulfate content was 0.6%.

[0039] 2, above-mentioned solution is carried out combined membrane refining operation according to 2-6 of embodiment 1, can obtain the sodium thiocyanate solution or sodium thiocyanate crystal that removes divalent anion salt, nanofiltration concentrated solution can be according to embodiment 1 7-8 for reuse operation.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for refining thiocyanate through a combination membrane method, belonging to the field of purifying and refining of chemical products. The method disclosed by the invention comprises the following steps of preparing ammonium thiocyanate or sodium thiocyanate solids of different purities into initial aqueous solution with a certain concentration, and controlling the total concentration of bivalent anion salt in the initial aqueous solution within a certain range by utilizing solubility difference; respectively carrying out active carbon decolouration treatment, micro-filtration membrane treatment, ultra-filtration membrane treatment and multi-stage nano-filtration membrane treatment of the obtained initial aqueous solution, respectively eliminating impurities in the solution, such as coloured substances, suspended particles, macromolecular substances and bivalent anion salt, thereby obtaining nano-filtration permeation solution, namely high-concentration thiocyanate aqueous solution; and concentrating the aqueous solution, thereby obtaining thiocyanate having high quality and purity. Nano-filtration concentrated water is thickened and then returns to initial aqueous solution to be recycled. The method for refining thiocyanate through the combination membrane method is simple and convenient for operation, moderate in condition, free from specific requirements of processes and equipment and strong in universality and applicability.

Description

technical field [0001] The invention relates to a method for purifying and refining thiocyanate based on combined membrane technology. It is especially suitable for refining thiocyanate products obtained by extracting salt from coke oven gas desulfurization waste liquid. It belongs to the field of purification and refining of chemical products. Background technique [0002] Thiocyanate series products, including sodium thiocyanate, ammonium thiocyanate, and potassium thiocyanate, are important basic chemical raw materials, widely used in polymer spinning solvents, anti-mold and antibacterial products, concrete admixtures, As well as the production and manufacturing of pesticides, medicines, dyes and other products, there is a huge market demand. The extraction of corresponding thiocyanate products from coke oven gas desulfurization waste liquid in coking enterprises has increasingly become the most important production process of this series of products, and the original c...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C01C3/20
Inventor 曹阳冯启明陈锋周旭峰周庆王喜军许顺龙陈荣奎邓百策
Owner 张家港燎原环保科技有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products