A kind of regeneration method of alkylation waste sulfuric acid

Abstract

The invention discloses a regeneration method of waste sulfuric acid from alkylation. The regeneration method comprises the following contents: the waste sulfuric acid generated in alkylation reactionis firstly subjected to heat exchange by a heat exchanger, mixed with partially recycled regenerated sulfuric acid at the bottom of a regeneration reactor, and a mixed liquid material enters the regeneration reactor from the top, flows through a first filler layer filled with a heat carrier, is uniformly dispersed in the first filler layer and absorbs mass transfer; then the material flows through a second filler layer filled with the heat carrier, organic matter in the liquid phase material is coked and carbonized on the surface of the high-temperature heat carrier and adhered to the surfaceof the heat carrier, regenerated sulfuric acid with the organic matter removed is discharged through the bottom of the regeneration reactor, part of the regenerated sulfuric acid is recycled back tothe regeneration reactor, part of the regenerated sulfuric acid is cooled and filtered and mixed with oleum, and the mixture returns to an alkylation production unit for continuous use. Aiming at defects in the prior art, the invention provides the regeneration method of waste sulfuric acid from alkylation. The method has the advantages of low operating temperature, mild reaction conditions, safereaction process, low energy consumption and the like.

Description

technical field [0001] The invention relates to a method for regenerating waste sulfuric acid produced in an alkylation reaction. Background technique [0002] In order to improve the quality of gasoline, the light hydrocarbon oil formed after alkylation is added to gasoline. In the alkylation reaction, concentrated sulfuric acid is often used as a catalyst. Generally, about 0.1t of waste sulfuric acid is produced for every 1t of light hydrocarbon oil produced, and its composition contains 80%~95% of H 2 SO 4 In addition, it also contains 3% to 8% organic matter and 2% to 8% water. The organic matter is mainly high molecular olefins, dienes, alkyl sulfonic acids, sulfuric acid esters and mercaptans. Alkylation waste acid is black and viscous, highly corrosive, unstable in nature, and emits a special odor. It is extremely harmful to humans, animals, and the environment. It has no reuse value and must be effectively disposed of. [0003] There are mainly several methods for...

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Problems solved by technology

During the reaction process, the regenerated sulfuric acid needs to be stripped after the oxidant is introduced, which increases the energy consumption of sulfuric acid stripping

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