Regeneration method for alkylated waste sulfuric acid

Abstract

Provided is a regeneration method for alkylated waste sulfuric acid. The regeneration method comprises: under redox conditions, waste sulfuric acid and oxidants are contacted, organic matters or tiny carbon particles in the waste sulfuric acid are reacted with the oxidants and converted into CO2, N2 and H2O, after steam stripping removal, regenerated sulfuric acid is obtained. The method can be carried out at a low pressure and at a low temperature, device operation energy consumption is low, investment is saved, operation is simple, and device maintenance cost is low.

Description

technical field [0001] The invention relates to a regeneration method for high-concentration waste sulfuric acid containing organic matter. More specifically, it relates to the regeneration method of the spent concentrated sulfuric acid catalyst in the process of generating high-octane gasoline components through the alkylation reaction of low-carbon olefins and low-carbon alkanes. Background technique [0002] In the process of petroleum refining industry, concentrated sulfuric acid is often used as a catalyst for the alkylation reaction of low-carbon hydrocarbon molecules. More specifically, C2~C5 olefins and isobutane undergo an alkylation reaction under the catalysis of 98% concentrated sulfuric acid, and the resulting alkylated oil is sulfur-free, aromatic-free, and has a high octane number, which is a high-quality high-octane oil Gasoline blending components. During the alkylation reaction, moisture, sulfur and nitrogen compounds, and side reaction products in the ra...

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Problems solved by technology

The disadvantage of this method is that the polymer oil contains a small amount of sulfuric acid, and it can be directly used as fuel oil, which will cause corrosion of the combustion boiler system

[0009] The process of pyrolysis method is complicated, and the cracking furnace part must maintain high temperature (1000°C~1100°C), so the energy consumption is high, the investment is large, and the maintenance cost is high

In addition, in the existing pyrolysis method, because the reactants are carried out in the gas phase, the leakage of harmful gas substances is inevitable, and a waste gas treatment device is required.

Since the pyrolysis method must be carried out at high temperature (1000°C~1100°C), the waste sulfuric acid spray gun is often blocked at high temperature, which affects the stable operation of the device and the maintenance cost of the device is high

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