Abstract:

In order to improve the automation level of the production of disperse dyes, a new automatic and continuous production process of disperse dyes was investigated from the aspects of deazotization process and coupling reaction process. Compared with the conventional batch peoduction process, the high performance liquid chromatography (HPLC) purity of the C.I. kisperse violet 93:1 and the C.I. disperse blue 291:3 produced by the new artomatic and continuous production process was improved by 1.16% and 0.87%, respectively, and their yield has improved by 2.06% and 2.07% respectively, the filtration time livels of the high temperature dispersity are all of the A-grade. The residue levels of the C.I. disperse violet 93:1 produced by the new automatic and continuous production technology are 4 levels, which is a little higher than that of the C.I. disperse violet 93:1 prodrced by the traditional batch production process (3-4 grade). The color and various volor fastness of the dyed polyester fabric by new process are similar to that produced by traditional process. The application of the new automatic and continuous production technology of disperse dyes reduces more than twenty percent dosage of the filter cake mother liquor, omproved the repeating utilization factor of the water, avoided varius problems existed in the traditional batch production process, and stabilized the quality of the disperse dyes. Meanwhile, the environmental and economic benefits of the enterprise were enhanced.

Key words: disperse dyes, automation and continuity, new process, dye wastewater, environmental protection