What are the main applications of sodium hydrosulfide?

Sodium hydrosulfide is an important raw material for thiolation reaction, which is widely used in organic synthesis and industrial production. For example, the dye industry is used as an additive for the synthesis of organic intermediates and the preparation of sulfide dyes. The leather industry is used for leather depilation and tannin, and also for wastewater treatment; The chemical fertilizer industry is used to remove the monomer sulfur in the activated carbon desulfurizer. It is the raw material for manufacturing ammonium sulfide and semi-finished products of pesticide ethanethiol. The mining industry is widely used in the selection of copper mines. Artificial fibers are produced for sulfite dyeing.

1) The method of reducing 2-amino-4-acetylaminophenylalkyl ether with sodium hydrosulfide is to add 2-nitro-4-acetylaminophenylalkyl ether and 2-nitro-4-acetylaminophenylalkyl ether to glacial acetic acid, and adjust the material to pH = 5 ~ 6 with liquid alkali; Heat to 90 ~ 105 ℃, add 10 ~ 25% sodium hydrosulfide solution dropwise, and keep it for 1 hour at this temperature; Slowly cool the product to precipitate crystals, filter out the crystals, wash the crystals with cold water until the filtrate pH = 7 to obtain 2-amino-4-acetylaminophenylalkyl ether, and apply the washing water to the next batch of reduction. The invention has the following advantages: (1) the reaction yield is high and the yield is above 90%; (2) The reaction speed is fast, so that the product is not easy to oxidize, the product color is good, and the quality is high; (3) No complicated post-processing, simple equipment and operation; (4) Less waste water, easy to treat, low emission cleaning process; (5) It enables petrochemical and other industries to recover hydrogen sulfide waste gas and obtain sodium hydrogen sulfide solution with low cost.

2) Sodium hydrosulfide can alleviate the biological toxicity of CdSe / ZnS quantum dots, and sodium hydrosulfide can alleviate the biological toxicity of CdSe / ZnS quantum dots to plants, animals or microorganisms. The invention has the advantages of simplicity, feasibility, convenience, single reagent required and easy access. Sodium hydrosulfide can sulfide with heavy metal ions released by CdSe / ZnS quantum dots to reduce the release of heavy metal ions, thus reducing the biological toxicity caused by quantum dots; At the same time, sodium hydrogen sulfide can ionize hydrogen sulfide ion in aqueous solution, and generate hydrogen sulfide through hydrolysis, improve the cell activity of organisms and alleviate the oxidative stress of adverse factors in the environment. Therefore, the use of sodium hydrosulfide in the present invention can alleviate the biological toxicity of CdSe / ZnS quantum dots to plants, animals or microorganisms.

3) Polyarylene sulfide is usually pressed with sodium hydrosulfide. Sodium hydrosulfide, alkali and polyhalogenated aromatic compounds are reacted in polar aprotic solvent at atmospheric pressure. Sodium hydrosulfide: halogenated aromatic compound (mol) = 1 ∶ 0.5 ~ 2, sodium hydrosulfide: catalyst (mol) = 1 ∶ 0.03 ~ 1, sodium hydrosulfide: base = 1 ∶ 0.9 ~ 1.6. The reaction temperature is 140 ℃ ~ 350 ℃ for 2 ~ 12 hours. The yield of polyarylene sulfide is more than 90%, the weight molecular weight is 56000, the product is white, the thermal stability is high, and the mechanical property is good.

4) 2, 2-2-aminoethylene glycol diphenyl ether was prepared by reduction of sodium hydrosulfide. 1, 2-2 (2-nitrophenoxy) ethane, water and sodium hydrosulfide aqueous solution were added to the autoclave. The reaction pressure was controlled to be 0-0.5mpa, the reaction temperature was 100-140 ℃, and the temperature was maintained for 2-6h. The reaction was completed; After the reaction, the pressure was discharged and the temperature was reduced, and the crude product was obtained by filtration at 30-35 ℃. The crude product is a dry and qualified product with water as solvent, which is refined by acid dissolution and alkali inversion. Using water as solvent, without using alcohol and other organic solvents, the reaction yield is more than 90%, and the product purity is more than 99.5%. Only sodium hydrosulfide and sodium thiosulfate can recover the wastewater.

5) The new use of sodium hydrosulfide in promoting wheat seed germination under heavy metal stress is to use sodium hydrosulfide as wheat seed in heavy metal polluted soil such as Al3 +, Cd2 +, Cr3 +, Cr6 +, Pb2 +, Hg2 +, etc. The invention can effectively improve the germination potential of wheat seeds under heavy metal stress and induce the seeds to germinate quickly and orderly. The results showed that pretreatment of wheat seeds with sodium hydrogen sulfide donor could significantly induce the active expression of amylase, protease, lipase and other hydrolases, promote the oxidative decomposition of stored materials, alleviate the oxidative damage caused by heavy metal stress, maintain the low level of membrane lipid peroxidation of seeds and seedlings, and be conducive to the normal growth of plumule and radicle. The invention solves the key problem of recovering heavy metal polluted areas in wheat production, has simple operation, and the required reagents are simple and easy to obtain.