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Waste dimethyl sulfoxide recovery and treatment method

A dimethyl sulfoxide, recycling and processing technology, applied in chemical instruments and methods, preparation of alkali metal nitrates, organic compounds, etc. The effect of low energy consumption, high extraction efficiency and simple process

Active Publication Date: 2015-01-28
夏瑜 +1
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Problems solved by technology

[0006] The utility model dimethyl sulfoxide waste salt recovery device can realize the recovery and utilization of part of the sodium nitrate component, but it can only recover one component of the dimethyl sulfoxide waste salt, and cannot recover and process other components. The remaining products are still highly dangerous; at the same time, the recovery process is not scientific and reasonable, and the accuracy of the sodium nitrate obtained is low

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  • Waste dimethyl sulfoxide recovery and treatment method
  • Waste dimethyl sulfoxide recovery and treatment method

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Embodiment Construction

[0037] During specific implementation: a kind of recovery processing method of dimethyl sulfoxide waste salt, comprises the following steps

[0038]a. After adding water to dimethyl sulfoxide waste salt to make a solution, add nitric acid to react, so that nitric acid and sodium nitrite undergo oxidation reaction and sodium hydroxide to produce neutralization reaction to generate sodium nitrate; at the same time, nitric acid and dimethyl The oxidation reaction of sulfoxide produces dimethyl sulfone;

[0039] b. cooling the solution obtained in step a to the crystallization temperature of dimethyl sulfone, and separating and proposing the dimethyl sulfone crystals and mother liquor;

[0040] c. Evaporating and concentrating the remaining mother liquor after separating dimethyl sulfone in step b, then cooling and crystallizing, generating solid sodium nitrate in a precipitated state and solid sodium methanesulfonate in a suspended state, and removing the solid sodium nitrate in ...

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Abstract

The invention discloses a waste dimethyl sulfoxide recovery and treatment method. The waste dimethyl sulfoxide recovery and treatment method is characterized in that a waste dimethyl sulfoxide solution is added with nitric acid, the mixture undergoes a neutralization reaction and an oxidation reaction, and dimethyl sulfone, sodium nitrate and sodium methanesulfonate crystals are separated from the reaction products. The method provided by the invention can realize recovery and recycle of a plurality of active components of the waste dimethyl sulfoxide, realizes change waste into valuables, is environmentally friendly and has the advantages of simple processes, environmental friendliness, no waste water discharge, low energy consumption and high extraction efficiency.

Description

technical field [0001] The invention relates to a method for treating high-risk waste generated in the production of dimethyl sulfoxide; in particular, it relates to a method for recycling and utilizing waste salt produced by absorbing nitrogen oxides with alkali during the production of dimethyl sulfoxide. Background technique [0002] Dimethyl sulfoxide (DMSO) is a sulfur-containing organic compound with the molecular formula (CH3)2SO. It is a colorless, odorless, transparent liquid at room temperature and a hygroscopic flammable liquid. With high polarity, high boiling point, good thermal stability, and non-proton and water-miscible characteristics, it can be dissolved in most organic substances such as ethanol, propanol, benzene and chloroform, and is known as a "universal solvent"; at the same time, its It has anti-inflammatory, analgesic, diuretic, and sedative effects, and is a very important medicinal and chemical product. [0003] In the production process of dimet...

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Application Information

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IPC IPC(8): C07C315/06C07C315/02C07C317/04C07C303/44C07C309/04C01D9/00
Inventor 夏瑜张胜
Owner 夏瑜
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