Chelation stabilizer suitable for liquid-phase oxidation process

Abstract

The invention discloses a chelation stabilizer suitable for a liquid-phase oxidation process. The stabilizer is prepared from a free radical scavenger, an antioxidant and a synergist in a compounding mode. The free radical scavenge is one or more of benzoate, phenylacetate and salicylic acid; the antioxidant is one or more of ascorbic acid, scorbic palmitate, erythorbic acid and sodium erythorbate; the synergist is prepared from citric acid and long-chain or branched-chain organic acid of isocitric acid. The chelation stabilizer can relieve degradation of a chelating agent in the desulfuration process, reduce chelating agent consumption and lower the operating cost of a desulfuration device.

Description

technical field [0001] The invention belongs to the field of chelating stabilizers and relates to a chelating stabilizer suitable for liquid-phase oxidation processes. Background technique [0002] In recent years, with the increasingly stringent environmental protection laws and regulations, people pay more and more attention to environmental protection. Strengthening the comprehensive management of environmental protection, implementing feasible environmental protection technical transformation measures, and effectively reducing the emission of exhaust gas have become the environmental protection measures generally adopted by various oil refining enterprises. The liquid-phase redox process has the advantages of reliable technology, simple process, convenient operation, stable operation of the device, suitable for working conditions with large fluctuations in acid gas and hydrogen sulfide content, high sulfur recovery rate, and small footprint of the device. It has good app...

AI Technical Summary

Problems solved by technology

With the degradation of the chelating agent, iron ions will continue to be lost, affecting the desulfurization efficiency

The current solution mainly consists of the following two methods. One is to maintain the concentration in the solvent by adding a chelating agent. This type of method will inevitably cause an increase in solvent consumption and an increase in operating costs; 2 S 2 o 3 Inhibits the degradation of chelating agents, but most of the thiosulfate will be absorbed by Fe 2+ The O2 fed during the regeneration process is oxidized to SO 4 2- and S 4 o 6 2- , resulting in the accumulation of salts, resulting in changes in the physical properties of the desulfurization solvent, affecting the precipitation of sulfur and the absorption of hydrogen sulfide

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