一种无水硫化碱的制备方法

Preparation method of anhydrous sodium sulfide

  • Inventors: WU YINGXI
  • Assignees: 吴迎喜
  • Publication Date: March 22, 2017
  • Publication Number: CN-106517100-A

Abstract

The invention discloses a preparation method of anhydrous sodium sulfide. The preparation method comprises the following steps: with industrial waste gas such as sulfuric acid, sulfur dye, etc. as a source of hydrogen sulfide gas, reacting the industrial waste gas after absorption and purification treatment with an excessive alkaline solution to obtain liquid sodium sulfide, and performing crystallization and vacuum drying treatment to obtain the anhydrous sodium sulfide. According to the preparation method, the technical route of directly reacting the alkaline solution with hydrogen sulfide gas to obtain the sodium sulfide is adopted, so that the consumption of a great quantity of non-renewable resources and the production of a great quantity of industrial waste residues and waste gas are completely avoided; the industrial waste gas such as sulfuric acid, sulfur dye, etc. is taken as the source of hydrogen sulfide gas, so that the production cost in industrial preparation of hydrogen sulfide gas is saved; and meanwhile, the anhydrous sodium sulfide is prepared by combining freezing crystallization or evaporative crystallization with vacuum drying, and crystallization mother liquor is recycled and is further concentrated and crystallized repeatedly, so that not only produced waste liquid is reasonably utilized, but also the product quality can be effectively improved. Therefore, the preparation method has a great practical value and industry prospect.
本发明公开了一种无水硫化碱的制备方法,选取硫酸、硫化染料等工业废气作为硫化氢气体来源,经吸收、净化处理后与过量碱类溶液反应得到液体硫化碱,再经过结晶、真空干燥处理后得到无水硫化碱。本发明采用碱类溶液与硫化氢气体的直接反应获得硫化碱的技术路线,完全避免了不可生资源的大量消耗,以及大量工业废渣、废气的产生并且以硫酸、硫化染料等工业废气作为硫化氢气体来源,节约了工业制备硫化氢气体的生产成本,同时采取冷冻结晶或蒸发结晶与真空干燥相结合的方法制备无水硫化碱,并对结晶母液进行回收并做进一步反复浓缩、结晶,不仅合理利用了生产废液,而且能够有效提升产品品质,具有较强的实用价值和行业前景。

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