Preparation method for calcium acetate magnesium salt

Abstract

The invention provides a preparation method of calcium magnesium acetate and a device thereof. The preparation method comprises extracting pyroligneous liquor with an organic solvent, and stripping the pyroligneous liquor with dolomite or limestone or calcium magnesium hydroxide to prepare the calcium magnesium acetate, wherein, acetic acid in the pyroligneous liquor and the dolomite or the limestone or the calcium magnesium hydroxide are taken as raw materials. The method comprises the following steps: extraction step S1: taking trioctylamine, trioctylphosphine oxide and n-butyl alcohol as extractants, selecting poly-aluminium sulfate as a demulsifier, and firstly extracting the acetic acid in the pyroligneous liquor; back extraction step S2: taking the dolomite or the limestone as a back extractant, performing back extraction on the extracted acetic acid, and allowing the back-extractant to react with the back-extracted acetic acid to generate the calcium magnesium acetate; and filtering and drying step S3: implementing processes such as filtration, concentration, drying and the like on the obtained calcium magnesium acetate to prepare granular calcium magnesium acetate. The invention develops a method for preparing the calcium magnesium acetate with low cost, and provides a new way for high-value utilization of the pyroligneous liquor.

Description

technical field [0001] The invention relates to a preparation method and equipment of an environment-friendly snow-melting agent. The wood vinegar produced by pyrolysis and dry distillation gasification of biomass is used as a raw material, the acetic acid is extracted with an organic solvent, and dolomite or limestone or calcium magnesium hydroxide is used to extract the acetic acid. The invention discloses a method for preparing calcium-magnesium acetate salt by stripping, which belongs to the technical field of chemical preparation. Background technique [0002] Calcium magnesium acetate (CMA) is a mixture of calcium acetate and magnesium acetate. It is an environmentally friendly deicing agent that can replace traditional chloride salts (NaCl, CaCl 2 ) deicing agent. Calcium magnesium acetate (CMA) has the advantages of not polluting the environment, being biodegradable, and less corrosive to bridges and road surfaces than chlorine salt deicing agents. However, due to t...

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Problems solved by technology

[0004] In order to overcome the shortcomings of the prior art, the present invention provides a method and equipment for preparing calcium magnesium acetate, which is applied to the wood vinegar in the waste liquid produced in the biomass pyrolysis and dry distillation gasification process, and is extracted and back-extracted Produce calcium-magnesium acetate deicing agent to solve the problem that the cost of preparing calcium-magnesium acetate by glacial acetic acid is too high. In the process of reaction between oxides and acetic acid in wood vinegar, emulsification is easy to occur, and the waste liquid after the reaction is not easy to reuse.

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