A kind of preparation method of pulp, fabric bleaching catalyst ligand

Abstract

The invention discloses a method for preparing a ligand of a pulp and fabric low-temperature bleaching catalyst. The main steps include: dissolving diethylenetriamine with a sulfonyl group in an organic solvent, adding an alkaline reagent and ethylene glycol dicarboxylic acid ester, react at 80-150°C for 6-20 hours, after the reaction, cool to room temperature and filter to obtain 1,4,7-trisulfonyl-1,4,7-triazacyclononane; Add the solid to sulfuric acid, stir at 80-130°C for 2-12 hours, add alkali to neutralize after cooling down, then add formaldehyde and formic acid to reflux to obtain 1,4,7-trimethyl-1,4,7-triaza Cyclononane. The preparation method of the invention is simple, the raw materials are easy to obtain, and the three wastes are less, which is suitable for industrial production and meets the environmental protection requirements of the current industrial production.

Description

technical field [0001] The invention belongs to the field of preparation of bleach catalyst ligands, in particular to the preparation of low-temperature bleach catalyst ligands. Background technique [0002] The fabric and pulp are bleached with hydrogen peroxide, with pure whiteness, no yellowing, no corrosion and no pollution to the equipment, but the high bleaching temperature will cause the fabric and pulp fibers to be partially broken, resulting in loss of strength. [0003] Manganese complex catalyst using 1,4,7-trimethyl-1,4,7-triazacyclononane as a ligand, Mn 2 (μ-O) 3 (MeTACN) 2 m 2 ·nH 2 O, where M is PF 6 , Cl or CH 3 COO is a kind of high-efficiency oxidation catalyst, which enables hydrogen peroxide to effectively bleach fabrics and pulp at relatively low temperature (50-70°C) and low alkalinity (pH9-10) in a short period of time (5-8 hours). The bleached fabric has high whiteness, less fiber breakage and high strength. [0004] However, the current prod...

AI Technical Summary

Problems solved by technology

But compared with the patent application of Donghua University, which used p-toluenesulfonyl chloride, 1mol of 1,4,7-trimethyl-1,4,7-triazacyclononane used at least 5mol of p-toluenesulfonate Acyl chlorides will produce a large amount of high-salt wastewater of sodium p-toluenesulfonate and sodium chloride, which has great environmental protection restrictions in industrial applications