An oxidation removing method of sodium nitrite in industrial waste residue of dimethyl sulfoxide

Abstract

An oxidation removing method of sodium nitrite in industrial waste residue of dimethyl sulfoxide is disclosed. The method includes a pretreating step, namely a step of mixing the waste residue and water according to a ratio of 1:1, adding an auxiliary oxidant the mass of which is 0.05-0.1% of the mass of the waste residue solution, with the auxiliary oxidant being prepared from concentrated nitric acid and sodium citrate according to a mass ratio of 85:15; and an oxidizing step, namely a step of subjecting the pretreated waste residue solution and ozone to oxidation under certain conditions to remove the sodium nitrite in the waste residue, with the concentration of the ozone during the oxidation being 0.005-0.008 g / L, 300 L of the ozone being consumed for each 1 kg of the waste residue solution, oxidation time being 0.5-1 h, temperature being controlled to be 25-35 DEG C and the stirring speed being 100-300 rpm. The method is advantaged by a low treatment cost, high treatment capacity, a high removing rate, and the like, and is an economical and environmental friendly treatment process.

Description

technical field

[0001] The invention relates to sulfoxide, in particular to an oxidation process of sodium nitrite in dimethyl sulfoxide industrial waste residue. Background technique

[0002] Dimethyl sulfoxide (DMSO) is a sulfur-containing organic compound with the molecular formula (CH 3 ) 2 SO, is a colorless, odorless, transparent liquid at room temperature. It has the characteristics of high polarity, high boiling point, good thermal stability, and water miscibility. It can also dissolve most organic substances such as ethanol, acetone, and chloroform. It is known as Universal solvent. In the industry, it is often used as a solvent and reaction reagent because of its high selective extraction ability. At the same time, it has anti-inflammatory, analgesic, diuretic, and sedative effects. It is often used as a raw material and carrier of drugs in the pharmaceutical industry.

[0003] At present, dimethyl sulfoxide is generally produced by dimethyl sulfide oxidation at...

Examples

Embodiment 1

[0013] Weigh 100g of dimethyl sulfoxide industrial waste residue, add 100g of water and stir to completely dissolve the waste salt, add 0.1g of prepared pro-oxidant, mix well, and use an ozone generator to pass ozone into it to control the ozone concentration to 0.005g / l, the amount of ozone used is 60L, the oxidation time is 0.5h, the oxidation temperature is 25°C, and the stirring speed is 100rpm. After the reaction, the sample was analyzed and the removal rate of sodium nitrite was calculated to be 99.10%.

Embodiment 2

[0015] Weigh 100g of dimethyl sulfoxide industrial waste residue, add 100g of water and stir to completely dissolve the waste salt, add 0.2g of the prepared pro-oxidant, mix well, and use an ozone generator to pass ozone into it to control the ozone concentration to 0.008g / l, the amount of ozone used is 60L, the oxidation time is 1h, the oxidation temperature is 35°C, and the stirring speed is 300rpm. After the reaction, the samples were analyzed and the removal rate of sodium nitrite was calculated to be 99.97%.

Embodiment 3

[0017] Weigh 100g of dimethyl sulfoxide industrial waste residue, add 100g of water and stir to completely dissolve the waste salt, add 0.2g of the prepared pro-oxidant, mix well, and use an ozone generator to pass ozone into it to control the ozone concentration to 0.006g / l, the amount of ozone used is 60L, the oxidation time is 0.5h, the oxidation temperature is 30°C, and the stirring speed is 200rpm. After the reaction, the samples were analyzed and the removal rate of sodium nitrite was calculated to be 99.79%.

technical field

[0001] The invention relates to sulfoxide, in particular to an oxidation process of sodium nitrite in dimethyl sulfoxide industrial waste residue. Background technique

[0002] Dimethyl sulfoxide (DMSO) is a sulfur-containing organic compound with the molecular formula (CH 3 ) 2 SO, is a colorless, odorless, transparent liquid at room temperature. It has the characteristics of high polarity, high boiling point, good thermal stability, and water miscibility. It can also dissolve most organic substances such as ethanol, acetone, and chloroform. It is known as Universal solvent. In the industry, it is often used as a solvent and reaction reagent because of its high selective extraction ability. At the same time, it has anti-inflammatory, analgesic, diuretic, and sedative effects. It is often used as a raw material and carrier of drugs in the pharmaceutical industry.

[0003] At present, dimethyl sulfoxide is generally produced by dimethyl sulfide oxidation at...

Examples

Embodiment 1

[0013] Weigh 100g of dimethyl sulfoxide industrial waste residue, add 100g of water and stir to completely dissolve the waste salt, add 0.1g of prepared pro-oxidant, mix well, and use an ozone generator to pass ozone into it to control the ozone concentration to 0.005g / l, the amount of ozone used is 60L, the oxidation time is 0.5h, the oxidation temperature is 25°C, and the stirring speed is 100rpm. After the reaction, the sample was analyzed and the removal rate of sodium nitrite was calculated to be 99.10%.

Embodiment 2

[0015] Weigh 100g of dimethyl sulfoxide industrial waste residue, add 100g of water and stir to completely dissolve the waste salt, add 0.2g of the prepared pro-oxidant, mix well, and use an ozone generator to pass ozone into it to control the ozone concentration to 0.008g / l, the amount of ozone used is 60L, the oxidation time is 1h, the oxidation temperature is 35°C, and the stirring speed is 300rpm. After the reaction, the samples were analyzed and the removal rate of sodium nitrite was calculated to be 99.97%.

Embodiment 3

[0017] Weigh 100g of dimethyl sulfoxide industrial waste residue, add 100g of water and stir to completely dissolve the waste salt, add 0.2g of the prepared pro-oxidant, mix well, and use an ozone generator to pass ozone into it to control the ozone concentration to 0.006g / l, the amount of ozone used is 60L, the oxidation time is 0.5h, the oxidation temperature is 30°C, and the stirring speed is 200rpm. After the reaction, the samples were analyzed and the removal rate of sodium nitrite was calculated to be 99.79%.