Method for absorbing and purifying hydrogen sulfide with EDTA (ethylene diamine tetraacetic acid) chelated iron copper compound system

Abstract

The invention relates to a method for absorbing and purifying hydrogen sulfide with an EDTA (ethylene diamine tetraacetic acid) chelated iron copper compound system, which comprises the following steps: dissolving 1-10wt% of soluble iron salt in deionized water to prepare an iron salt solution; adding soluble copper salt and EDTA disodium salt into the iron salt solution in an iron salt / copper salt / EDTA disodium salt mass ratio of (1-5):1:1, thereby obtaining an EDTA chelated iron copper compound absorption solution; and introducing hydrogen sulfide gas with the concentration of 800-4000ppm to carry out absorption reaction. The method provided by the invention has the advantages of high removal efficiency, mild reaction conditions, low absorption solution cost, low raw material consumption, wide application range and the like, and is simple to operate.

Description

technical field [0001] The invention belongs to the technical field of atmospheric treatment, and in particular relates to a method for absorbing and purifying hydrogen sulfide by using an EDTA chelated iron-copper composite system. Background technique [0002] Currently, hydrogen sulfide (H 2 S) As one of the main components of malodorous gas, it mainly comes from the production process of petrochemical industry, natural gas industry, metallurgy industry, sulfuric acid manufacturing industry, garbage treatment plant and mineral processing industry. h 2 The existence of S will not only cause corrosion of equipment and pipelines, poisoning of catalysts, but also directly endanger human health and even life. [0003] Internationally for H 2 Research on S processing technology is very active. At present, desulfurization technology at home and abroad is relatively mature, and there are many desulfurization methods and desulfurization processes, mainly including dry method a...

AI Technical Summary

Problems solved by technology

The dry desulfurization efficiency is not high, the regeneration of desulfurizer is difficult, and the sulfur capacity is relatively low. It is mainly suitable for fine desulfurization

The wet desulfurization process has large processing capacity, high desulfurization efficiency, and continuous operation, but the investment and operation costs are high, which is difficult for ordinary manufacturers to bear

In the new process of wet desulfurization, the development of complex iron method is a hot spot. This method has the advantages of fast absorption speed, high desulfurization efficiency, large sulfur capacity, fast regeneration speed, less side reactions, low cost, and no toxicity. However, in practical applications, there are problems such as high equipment requirements, low sulfur recovery rate, and oxidative degradation of complexing agents.