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Method for preparing fertilizer grade KNO3 with dimethyl sulfoxide waste slag

A technology for preparing fertilizers from dimethyl sulfoxide, applied in the fields of alkali metal nitrates, chemical instruments and methods, solid waste removal, etc.

Inactive Publication Date: 2015-08-19
WENGFU (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003]However, the treatment of dimethyl sulfoxide industrial waste has always been a problem. If simple storage is used, it will easily pollute the environment
After sampling and analysis, the main component of dimethyl sulfoxide industrial waste residue is sodium nitrate, accounting for about 80%, but it also contains a certain amount of sodium nitrite, accounting for about 2~3%. Sodium nitrite is flammable in contact with organic matter Explosion. At the same time, sodium nitrite is toxic and carcinogenic. If people take 0.2~0.5g, it will cause food poisoning. If it exceeds 3g, it may cause death. And natural ecological environment caused serious damage, so it is imminent to find a way to properly deal with dimethyl sulfoxide residue

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Get 100g of dimethyl sulfoxide industrial waste residue and place it in a 500ml beaker, add 100g of absolute ethanol, stir at 200rpm for 30min, mix well and then filter the solution, wash the filter cake twice with absolute ethanol, each time the amount of absolute ethanol is 50g. Take the above filter cake and add 300ml of water to dissolve it, add a certain amount of nitric acid to adjust the pH=7, and add 2g of hydrogen peroxide, react at a reaction temperature of 30°C and a stirring speed of 200rpm for 10min, then add 76g of potassium chloride, control the reaction temperature at 30°C, stir The speed is 150rpm, the reaction time is 0.5h. After the reaction is completed, concentrate until a large amount of crystals appear and then filter while hot. The filtrate is slowly cooled and crystallized, and then filtered again. The obtained filter cake is the crude product of potassium nitrate, which is obtained after recrystallization. Fertilizer grade potassium nitrate pro...

Embodiment 2

[0023] Get 100g of dimethyl sulfoxide industrial waste residue and place it in a 500ml beaker, add 300g of dehydrated ethanol, stir at 200rpm for 30min, mix well and filter the solution, wash the filter cake twice with dehydrated ethanol, and the amount of dehydrated ethanol each time is 50g. Take the above filter cake and add 300ml of water to dissolve it, add a certain amount of nitric acid to adjust the pH=7, and add 5g of hydrogen peroxide, react at a reaction temperature of 60°C and a stirring speed of 400rpm for 60min, then add 89g of potassium chloride, control the reaction temperature at 60°C, stir The speed is 400rpm, the reaction time is 2h, then concentrate, until a large amount of crystals appear, then filter while hot, the filtrate is slowly cooled and crystallized, and then filtered again, the obtained filter cake is the crude product of potassium nitrate, after recrystallization, fertilizer grade potassium nitrate with high purity is obtained product. After tes...

Embodiment 3

[0025] Get 100g of dimethyl sulfoxide industrial waste residue and place it in a 500ml beaker, add 200g of dehydrated ethanol, stir at 200rpm for 30min, mix well and filter the solution, wash the filter cake twice with dehydrated ethanol, and the amount of dehydrated alcohol is 50g. Take the above filter cake and add 300ml of water to dissolve it, add a certain amount of nitric acid to adjust the pH=7, and add 4g of hydrogen peroxide, react at a reaction temperature of 50°C and a stirring speed of 300rpm for 30min, then add 80.5g of potassium chloride, control the reaction temperature at 50°C, The stirring speed is 200rpm, the reaction time is 1h, then concentrate until a large amount of crystals appear, then filter while hot, the filtrate is slowly cooled and crystallized, and then filtered again, the obtained filter cake is the crude product of potassium nitrate, and after recrystallization, fertilizer grade nitric acid with high purity is obtained Potassium products. After...

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Abstract

The invention discloses a method for preparing fertilizer grade KNO3 with dimethyl sulfoxide waste slag, and the fertilizer grade KNO3 is prepared by taking the dimethyl sulfoxide industrial waste slag as a raw material through process steps of decarbonizing, oxidating, compounding, concentration-crystallizing, and recrystallizing, and the like. According to the method, not only is toxic and harmful substance sodium nitrite in the dimethyl sulfoxide waste slag removed, but also the difficult problem of environment protection is solved, meanwhile nitrogen resource in the waste slag is fully used, and the waste slag is made profitable to produce agricultural fertilizer grade KNO3, and product purity achieves more than 98% and achieves the quality standard of a national fertilizer grade KNO3 product, and certain economic benefits are created, at the same time, a side product NaCl generated by the method is non-toxic and harmless and can be preserved with a conventional method, besides the treatment difficult problem of the industrial waste slag of the dimethyl sulfoxide is perfectly solved, and the method is an environment-friendly production process with good economic benefits and less environment pollution.

Description

technical field [0001] The invention relates to a preparation process of fertilizer-grade potassium nitrate, which belongs to the field of fertilizer chemical industry. technical background [0002] The molecular formula of dimethyl sulfoxide (DMSO) is (CH 3 ) 2 SO, colorless and transparent liquid at room temperature, has high polarity, high hygroscopicity, high boiling point and flammability, low toxicity, good thermal stability, soluble in most organic substances such as water, ethanol, acetone, benzene and chloroform, is A strong polar inert solvent. Dimethyl sulfoxide, always known as "universal solvent" and "universal medicine", is widely used in petrochemical medicine, pesticide, aromatics extraction, artificial wool, electronics and national defense industries. Dimethyl sulfoxide is a pharmaceutical intermediate, commonly known as "universal drug" and "universal solvent". [0003] However, the treatment of dimethyl sulfoxide industrial waste has always been a pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D9/00B09B3/00
CPCC01D9/14C01D9/16
Inventor 郭举刘飞
Owner WENGFU (GRP) CO LTD
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