No-adhesive zeolite adsorbent for organic liquid medium iodine removing method

Abstract

The organic liquid medium deiodinating process with no-adhesive zeolite adsorbent includes: filling no-adhesive zeolite adsorbent in fixed bed, making the iodine-containing medium contact with no-adhesive zeolite adsorbent containing at least one kind of exchanging metal cation, controlling the temperature and space velocity of the organic liquid medium passing through the adsorbing bed to lower the total iodine content in the iodine containing medium to less than 10 ppb. The adsorbent is prepared with hydrogen type zeolite powder with SiO2/Al2O3 ratio of 15-30 and through adhering to form and crystal conversion. The adsorbent can eliminate organic and inorganic iodide and molecular iodine from organic medium effectively. The method of the present invention is suitable for eliminating iodide from various organic matters.

Description

1. Technical field: [0001] The invention relates to a method for deiodination of organic liquid media, in particular to disclose a method for deiodination of organic liquid media with a binderless zeolite adsorbent, which is applied to remove iodide in acetic acid, propionic acid and / or acetic anhydride. 2. Background technology: [0002] With the continuous expansion of the type and production scale of synthetic fine chemicals in the carbonylation process, the advantages of this process are more and more recognized by people. Using rhodium / iodide as a catalyst to carry out carbonylation reaction of raw materials such as alcohols, olefins or esters, a series of products with important uses can be synthesized, such as methanol to acetic acid, ethylene to propionic acid, methyl acetate to acetic anhydride, etc. Iodides (including inorganic iodine, organic iodine and iodine molecules) or their derivatives inevitably exist in the synthesized final product. Although most iodides...

AI Technical Summary

Problems solved by technology

Due to the SiO of the ZSM-5 zeolite raw material used 2 / Al 2 o 3 Too high, plus the binder blocks the pore opening on the surface of the zeolite, hinders the diffusion of silver ions, and seriously affects the silver loading of the deiodination adsorbent.