A method for recycling low-concentration nitric acid solution in the production of ethylene glycol from calcium carbide furnace tail gas
A technology of calcium carbide furnace tail gas and nitric acid solution is applied in the chemical industry, and can solve problems such as a large number of catalysts, and achieve the effects of high recovery rate, feasible process technology, and reduction of nitric acid recovery rate
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[0031] Refer to attached figure 1 , a method for recovery and utilization of low-concentration nitric acid solution in the production of ethylene glycol from calcium carbide furnace tail gas, from NO in the recycle gas a at the outlet of the recycle compressor in the DMO synthesis system and methanol and in the low-concentration nitric acid solution c from the MN regeneration unit Nitric acid, under the action of methanol vapor heat tracing, passes through the recovery and utilization system of low-concentration nitric acid waste liquid, and reacts to generate methyl nitrite and water.
[0032]Another implementation example is different in that the recycling system of low-concentration nitric acid waste liquid includes a nitric acid purification liquid fine filter (4), a nitric acid purification inlet and outlet heat exchanger (5), and a nitric acid purification tower feed tank (2) , nitric acid purification tower liquid circulation pump (3), nitric acid purification tower (1...
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