Waste acid treatment method and treatment system for acesulfame preparation technique by sulphuric anhydride cyclization method

Abstract

The present invention is process of treating waste acid solution from Acesulfame potassium preparing sulfuric anhydride cyclizing process. The process of treating waste acid solution includes the reaction of the waste acid solution and the mixture comprising Mg(OH)2 or MgO and water in a neutralizing reactor to produce triethylamine gas, cooling triethylamine gas in a cooler into triethylamine liquid and collecting in a tank, regulating the pH value of neutralizing reaction resultant in a regulating tank with 98 % concentration sulfuric acid solution into 5-7, filtering, cooling the filtrate in a MgSO4 cooling reactor to separate out MgSO4 hydrate. The present invention has MgSO4 yield up to 95 % and N(C2H5)3 recovering rate up to 95 % and can eliminate environmental pollution caused by Acesulfame potassium production.

Description

technical field [0001] The invention relates to waste acid treatment, in particular to a sulfuric anhydride (SO 3 ) The waste acid treatment method and treatment system in the process of preparing acesulfame potassium by cyclization method. Background technique [0002] With sulfuric anhydride (SO 3 ) in the process of producing acesulfame potassium by cyclization method, a certain amount of sulfuric acid with a concentration of 30%-80% is produced, and the sulfuric acid phase contains triethylamine sulfate. It is usually necessary to neutralize sulfuric acid and triethylamine sulfate under alkaline conditions to generate salts to recover triethylamine in a large amount. Existing processing method is that the mixed solution of waste sulfuric acid and triethylamine sulfate salt is in Ca(OH) 2 Neutralized in a mixed solution with water, and then reacted to form CaSO 4 · 2H2O. [0003] where the reaction formula is: [0004] h 2 SO 4 +Ca(OH) 2 →CaSO 4 +H 2 o [0005...

AI Technical Summary

Problems solved by technology

However, since Ca(OH) 2 The purity of CaSO is not very high, usually between 70-80%, so the generated CaSO 4 2H 2 The purity of O is correspondingly not very high, and the centrifugal drying of CaSO 4 2H 2 The energy consumption of O is relatively large, and at the same time, the centrifuged CaSO 4 2H 2 O needs to be calcined at high temperature to generate anhydrous CaSO 4 , which increases a large part of energy consumption, and finally the generated CaSO 4 The purity is not very high, it is difficult to sell as building materials and chemical raw materials

If it is discharged after direct neutralization, it will cause environmental pollution, so it is necessary to find a new p-sulfuric anhydride (SO 3 ) cyclization method to prepare the waste acid in the process of acesulfame potassium for processing, thereby effectively solving the environmental problems of waste acid treatment

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