Preparation method of molecular sieve template high-purity hexamethonium hydroxide water solution

Abstract

The invention discloses a preparation method of a molecular sieve template high-purity hexamethonium hydroxide water solution. The method comprises the following steps: dissolving 1,6-hexamethylenediamine in a formaldehyde-formic acid mixed solution to obtain tetramethyl hexamethylenediamine, dissolving the prepared tetramethyl hexamethylenediamine in a methanol-acetonitrile mixture, introducing methyl chloride or bromomethane to prepare hexamethonium halide, finally adding the hexamethonium halide water solution into a three-chamber two-membrane electrolysis bath, and carrying out electrolysis to obtain the high-purity hexamethonium hydroxide water solution with low concentrations of metal ions, halogen ions and residual organic solvents. By adopting the technical scheme, the preparation method implements green high-yield low-cost industrial production of the hexamethonium hydroxide water solution.

Description

technical field [0001] The invention relates to a preparation method of a high-purity hexamethonium hydroxide aqueous solution as a molecular sieve template agent. Background technique [0002] Since the mid-1950s, the preparation and application of zeolite molecular sieves have developed rapidly, and the comprehensive development from low-silicon-alumina to medium-silicon-alumina and even high-silicon-alumina has greatly promoted the application of molecular sieves and the development of the industry. Among them, the application of templates in synthesis has brought a qualitative leap in the synthesis of molecular sieves. Templating agents act as structural templates during the formation of molecular sieves, leading to the generation of special structures with specific catalytic functions. Some molecular sieves have only found extremely limited templates, and can even be successfully synthesized only under the action of the only matching template. Hexamethyldiammonium hyd...

AI Technical Summary

Problems solved by technology

The disadvantage is: the cost of using precious metal raw materials is too high, and there will be a small amount of silver ion residue

Defects are: there are flammable and explosive organic solvents in the product, the product yield is about 85% low, the product quality is poor, and the content of halide ions and alkali metal ions in the product reaches about 2000PPM, which is used as a template to prepare molecular sieves, which will reduce the molecular sieve. Catalytic activity

The disadvantage is that the resin is frequently regenerated, and a large amount of wastewater containing sodium hydroxide and halide ions is produced. The product quality is poor. Because the ion exchange rate cannot reach 100% and the residue of regenerated sodium hydroxide, the product contains halide ions and alkali metal ions.

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