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

A technology for waste acid treatment and acesulfame potassium, applied in chemical instruments and methods, neutralized water/sewage treatment, magnesium sulfate, etc., can solve the problems of difficult sales of building materials and chemical raw materials, high energy consumption, and low purity. , to achieve the effect of eliminating the discharge of high-salt sewage and solving environmental problems

Active Publication Date: 2008-03-26
ANHUI WEIDUO FOOD INGREDIENTS CO LTD
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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 final...

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

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Embodiment Construction

[0022] The present invention is described in detail below in conjunction with accompanying drawing:

[0023] Referring to accompanying drawing 2 and accompanying drawing 3, Fig. 2 has shown the schematic diagram of the system of using Mg(OH) 2 or MgO to treat waste acid of the present invention. The system includes a waste acid storage tank 11, a neutralization tank 12, a cooler 13, a triethylamine receiving tank 14, a pH value adjustment tank 15, a filter 16, a cooling tank 17, and a centrifuge 18, wherein the waste acid storage tank 1 passes through The valve leads into the neutralization kettle 12, the top of the neutralization kettle 12 is connected with a cooler 13, the other end of the cooler 13 is connected to receive the triethylamine receiving tank 14 cooled by the cooler, and the bottom of the neutralization kettle 12 is connected to the In the pH adjustment tank 15 containing the reacted materials, the pH adjustment tank 15 is connected to the cooling tank 17 throug...

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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...

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Application Information

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IPC IPC(8): C02F9/04C02F1/66C01F5/40
Inventor 罗春龙董晓峰李叔忠黄久江
Owner ANHUI WEIDUO FOOD INGREDIENTS CO LTD
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