Method for recycling dimethyl sulfoxide waste residue through multi-stage extraction

A technology of dimethyl sulfoxide and dimethyl sulfone, which is applied in the field of resource recovery and utilization of dimethyl sulfoxide production waste residues, can solve problems such as toxic and harmful waste residue pollution, achieve high recovery efficiency, solve production waste residue pollution problems, Effects that are easy to implement

Inactive Publication Date: 2015-05-06
HUBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The invention can efficiently separate and recycle dimethyl sulfoxide, dimethyl sulfone and sodium nitrate in the dimethyl sulfoxide waste residue, so as to solve the pollution problem of a large amount of toxic and harmful waste residue generated in the dimethyl sulfoxide manufacturing process, and has great advantages Good economic and social benefits

Method used

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  • Method for recycling dimethyl sulfoxide waste residue through multi-stage extraction
  • Method for recycling dimethyl sulfoxide waste residue through multi-stage extraction

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The waste residue sample 1# used was taken from the waste residue produced by a dimethyl sulfoxide production facility in Xinjiang. The sample components were checked by laboratory tests:

[0025] component name Dimethyl sulfoxide Dimethyl sulfone total inorganic salt sodium nitrate sodium nitrite water percentage content 17% 20% 38% 28% 6% 25%

[0026] Put waste residue 1# and benzene into the primary extraction tank, operate according to the first process flow, and get benzene at the outlet of condenser 1# with a recovery rate of 95%. Dimethyl sulfoxide was obtained at the 2# outlet of the condenser, and the recovery rate was 96%. Dimethyl sulfone is obtained at the 3# outlet of the condenser, and the recovery rate is 98%. Sodium nitrate was obtained by dehydration and drying at the outlet of the atmospheric pressure evaporator, and the recovery rate was 99%. .

Embodiment 2

[0028] The waste residue sample 2# was taken from the waste residue produced by a dimethyl sulfoxide production facility in Guizhou. The sample components were checked by laboratory tests:

[0029] component name Dimethyl sulfoxide Dimethyl sulfone total inorganic salt sodium nitrate sodium nitrite water percentage content 8.4% 38.1% 45% 32% 8% 8.5%

[0030] Put the waste residue 2# and benzene into the primary extraction tank, operate according to the second process flow, and the recovery rate of benzene at the outlet of condenser 1# is 95%. Dimethyl sulfone was obtained at the outlet of the drier after the reaction tank, and the recovery rate was 120% (containing the amount after the oxidation of dimethyl sulfoxide). Sodium nitrate was obtained by dehydration and drying at the outlet of the atmospheric pressure evaporator, and the recovery rate was 99%.

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Abstract

The invention provides a method for recycling dimethyl sulfoxide waste residue through multi-stage extraction. The first-stage extraction comprises the steps of separating dimethyl sulfone and dimethyl sulfoxide by using an extracting agent (benzene) and respectively recycling the extracting agent (benzene), dimethyl sulfoxide and dimethyl sulfone products by using a distilling and condensing way; the second-stage extraction comprises the steps of separating benzene residual liquor containing dimethyl sulfone and dimethyl sulfoxide out of the solid phase (obtained after the first-stage extraction) in the presence of an extracting agent (methanol), respectively recycling the extracting agent (methanol) and the benzene residual liquor by using a distilling and condensing method and returning the benzene residual liquor to a former distillation tower; the solid phase in the second-sage extraction is dissolved by using water, air or oxidant is introduced to oxidize sodium nitrite into sodium nitrate, and then sodium nitrate is evaporated and crystallized to extract inorganic components. The treatment method disclosed by the invention is simple and safe in process, low in evaporation temperature, operated at ordinary pressure, easy to implement and low in operation cost, the whole course is of close circulation, components of the waste residue are completely recycled, the recycling efficiency is high, the secondary pollution of waste is avoided, pollution problem caused by the dimethyl sulfoxide production waste residue can be solved, and a certain economic value is created.

Description

technical field [0001] The invention belongs to the technical field of resource recovery and utilization of dimethyl sulfoxide production waste residue, in particular to a method for recycling and utilization of multistage extraction dimethyl sulfoxide waste residue. The invention can efficiently separate and recycle dimethyl sulfoxide, dimethyl sulfone and sodium nitrate in the dimethyl sulfoxide waste residue, so as to solve the pollution problem of a large amount of toxic and harmful waste residue generated in the dimethyl sulfoxide manufacturing process. Background technique [0002] A large amount of waste residue is produced in the process of producing dimethyl sulfoxide from dimethyl sulfide as raw material and nitrogen dioxide as a catalyst. The main production link is the dimethyl sulfide oxidation neutralization section. Nitrate concentrated solution neutralized by alkali (sodium hydroxide). The nitrate solution contains organic substances such as sulfoxide and s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C317/04C07C315/06C01D9/00
Inventor 康群李兆华张祖尧莫彩芬侯帮飞
Owner HUBEI UNIV
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