A device and method for recycling waste sulfuric acid from alkylation

Abstract

The invention relates to an alkylate waste sulfuric acid resourceful treatment device and method. The device is composed of a reaction flotation tower, a crystallizer, a heat exchanger, a mother solution circulation pump, a condensate pump and connecting pipelines between the components. Alkylate waste sulfuric acid and ammonia gas serve as inlet materials of the reaction flotation tower, and a high-temperature and high-pressure ammonium sulfate mother solution generated at the bottom of the tower enters a crystallizer; low-pressure steam generated by the reaction flotation tower is extracted from the top of the tower and enters an outer jacket of the crystallizer; polymerization oil in the alkylate waste sulfuric acid is subjected to floatation and extraction in reaction and floatation integrated equipment to obtain polymerization oil; the normal-pressure saturated ammonium sulfate mother solution crystallized in the crystallizer returns the reaction flotation tower through the mother solution circulation pump; generated crystals are extracted to serve as ammonium sulfate crystals; the normal-pressure steam generated in the crystallizer is condensed through the heat exchanger and then returns to the reaction flotation tower through the condensate pump; condensation water generated in the outer jacket of the crystallizer returns to the reaction flotation tower through the condensate pump. The method process is simplified, the operation time is shortened, and the method is environmentally friendly.

Description

technical field [0001] The present invention relates to a resource treatment device and method for alkylation waste sulfuric acid, specifically, it is a method for producing sulfuric acid by reacting alkylation waste sulfuric acid with ammonia gas, reaction flotation, depressurization evaporation and crystallization, etc. Ammonium fertilizer and by-product alkylate oil method. The technology belongs to the field of waste resource utilization in the petrochemical industry. Background technique [0002] Alkylate oil (iso-octane) is an important gasoline additive component, which is mainly produced by sulfuric acid method in China. This method produces about 100 kilograms of waste sulfuric acid for every ton of alkylated oil produced, and it is estimated that more than 1 million tons of alkylated waste sulfuric acid needs to be treated in my country every year. This waste sulfuric acid is dark black, contains about 85% sulfuric acid, 5% polymerized oil, 5% sulfuric acid ester...

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Problems solved by technology

[0005] The present invention proposes a recycling treatment device and method for alkylation waste sulfuric acid. The method adopts an integrated design and solves the problems of high energy consumption, intermittent operation, serious waste of heat, and difficulty in polymerizing oil in the traditional method of alkylation waste sulfuric acid treatment. Recycling, ammonium sulfate crystalline products and other problems, while solving environmental problems, realize the resource utilization of alkylation waste sulfuric acid, which has good economic and social benefits

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