- Method and device for preparing anhydrous peroxyacetic acid solution
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The invention discloses a method and device for preparing an anhydrous peroxyacetic acid solution. The method comprises the following steps: reacting percarbamide and excessive acetic acid under the catalytic action of sulfuric acid to generate a peroxyacetic acid-water-urea mixture; distilling the mixture, absorbing moisture from the vapor by using sulfuric acid to obtain anhydrous peroxyacetic acid acetic acid vapor, and cooling the vapor to obtain an anhydrous peroxyacetic acid acetic acid solution; and reacting sulfuric acid with urea to generate a liquid urea sulfate hydrate which resides in the reaction kettle. The device comprises a reaction kettle (1), a rectifying drying tower (2), a cooling tower (3) and a vacuum device (4), wherein the top of the reaction kettle (1) is communicated with the bottom of the rectifying drying tower; the top of the rectifying drying tower is provided with a concentrated sulfuric acid feed port and a vapor outlet; the vapor outlet is communicated with the cooling tower; and the cooling tower is communicated with the vacuum device. Compared with the acetaldehyde oxidation process for preparing the anhydrous peroxyacetic acid solution, the method disclosed by the invention has the advantages of simple technical process, low equipment investment, high safety, environment friendliness and no pollution, and has important practical application value.
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Paragraph 0025; 0026
(2016/12/01)
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- Lowering of the pH of textile processing solutions by adding urea sulfate as a pH adjusting agent
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A method for the adjustment of pH in textile processing solutions that includes the use of urea sulfate or other strong acid in the presence of a weak base.
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