Molecular sieve deiodination agent preparation method and molecular sieve deiodination agent

Abstract

The invention relates to a molecular sieve deiodination agent preparation method and a molecular sieve deiodination agent. The method comprises: loading a molecular sieve on an ion exchange column; dissolving a non-silver metal salt in deionized water to form a salt solution containing non-silver metal ions; making the salt solution containing the non-silver metal ions continuously pass through the ion exchange column filled with the molecular sieve at a temperature of 60-100 DEG C, wherein the passing time is controlled at 20-30 h, so that the non-silver metal ions are loaded in the molecularsieve; and washing the molecular sieve with deionized water, taking out the molecular sieve loading the non-silver metal ions, and drying to obtain the molecular sieve deiodination agent containing the non-silver metal ions. According to the invention, the molecular sieve deiodination agent is low in cost, and can react with the organic iodine or inorganic iodine in acetic acid to generate iodideprecipitate, so that the iodine content in acetic acid can be reduced by 50-95%; and by combining the molecular sieve deiodination agent and the existing silver-loading ion exchange resin or silver-loading molecular sieve, the use amount of the silver-containing deiodination agent can be greatly reduced, so that the iodine element in acetic acid can meet the specified requirements, and the adverse effects on the subsequent industrial production taking the acetic acid as the raw material are avoided.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a preparation method of a molecular sieve deiodination agent and the molecular sieve deiodination agent. Background technique [0002] As an important chemical basic raw material, acetic acid has a very wide range of uses. Industrial acetic acid is mainly obtained from methanol through low-pressure carbonylation. Since iodide is used as an auxiliary agent for metal catalysts in this process, there is a certain amount of iodide and its derivatives in the final product. Although most of the iodide can be removed by traditional distillation and rectification, it requires a lot of heat and increases the cost, and a small amount of iodide will still remain in acetic acid. The presence of these iodides has a greater impact on the subsequent application of acetic acid, especially the production process of iodine-sensitive metal catalysts. For example: an important use of ace...

AI Technical Summary

Problems solved by technology

[0006] Based on this, it is necessary to provide a preparation method of a molecular sieve deiodination agent and a molecular sieve deiodination agent for the current problems that the removal cost of iodide in acetic acid is relatively high, and the removal effect is poor, and it is easy to bring adverse effects on the subsequent application of acetic acid.