A kind of recycling method of waste water produced by mixing sulfur transfer agent and FCC catalyst

Abstract

The invention discloses a recycling method for the mixed production wastewater of a sulfur transfer agent and an FCC catalyst. The method comprises: based on the volume of the wastewater, mixing 1 part of the sulfur transfer agent production wastewater with 0.2-5 parts of the FCC catalyst production wastewater, Obtain the mixed production waste water of sulfur transfer agent and FCC catalyst; Add sulfur transfer agent fine powder in described mixed production waste water as auxiliary settling agent, obtain mixed suspension; Based on the volume of described mixed production waste water, described sulfur The addition of transfer agent fine powder is 1-15 g / L; the pH value of the mixed suspension is controlled at 2-6; the mixed suspension with a pH value of 2-6 is subjected to primary solid-liquid separation , to obtain a primary clear liquid and a primary heavy phase and / or sediment; the primary clear liquid is subjected to secondary solid-liquid separation treatment to obtain a secondary clear liquid and a secondary heavy phase and / or sediment, and then the The secondary clear liquid is transported to the production process of the sulfur transfer agent for recycling. Through the method of the invention, the rare earth elements dissolved in the mixed wastewater can be reused, which not only recovers resources, but also reduces environmental pollution.

Description

technical field [0001] The invention relates to a method for recycling waste water produced by mixing a sulfur transfer agent and an FCC catalyst. Background technique [0002] In the fluidized catalytic cracking (FCC) process, the raw oil and the catalyst are quickly contacted in the riser for catalytic cracking reaction, and the coke generated by the reaction is deposited on the catalyst to cause its deactivation, and the deactivated catalyst enters after stripping The regenerator performs char regeneration. During the regeneration process, the sulfur-containing compounds deposited in the coke are oxidized to generate SOx, which is discharged into the atmosphere along with the regeneration flue gas, causing environmental pollution. [0003] The use of flue gas SOx transfer aids (also known as sulfur transfer aids or sulfur transfer agents) is the main technical measure to control SOx emissions from regeneration flue gas of FCC units. Its working principle is that in the ...

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Problems solved by technology

[0005] Because the sulfur transfer agent contains a variety of metal components that are easy to pollute the FCC catalyst, its production wastewater cannot be reused in the production of FCC catalyst

Even if the waste water is reused in the production process of the sulfur transfer agent itself, if it is directly recycled online without treatment, there will be the following problems: (1) if it is reused to prepare the rare earth impregnation solution, the fine particles and rare earth flocculation and precipitation contained therein will Continuous accumulation will cause the filter cloth mesh to be gradually blocked, the filtration efficiency will be greatly reduced, and may even cause production interruption; (2) If it is reused in the colloidal forming process, the solid particles contained in the colloidal spraying will not only be easily worn and sprayed dry tower atomizing nozzle, and the adhesion of the colloid causes poor sphericity of the additive particles, which affects the wear resistance

However, the treatment method mainly focuses on the removal of ammonia nitrogen and suspended particulate matter, and needs to add flocculants, chemical precipitants and other substances. The operation is relatively complicated, and the reuse of rare earth resources is not considered.

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