Technology and equipment for recycling nitric oxides and purifying tail gas

Abstract

The invention relates to a technology and equipment for recycling nitric oxides and purifying tail gas, which mainly solve the technical problems of low recovery rate and low deprivation rate of the nitric oxides in the prior art. In a technical scheme, the technology is realized by adopting the following steps of: (1) respectively introducing a tail gas material flow containing the nitric oxides, a first whiff of oxygen and C1 to C4 alkyl alcohols into a first rotating packed bed from an air inlet and a liquid inlet; in the conditions with the temperature of minus 20 DEG C to 100 DEG C, the pressure of 0.1 MPa to 5.0 MPa and the mole ratio of the nitric oxides to the oxygen to the C1 to C4 alkyl alcohols as of 1:(0.1-1):(1-100), carrying out a first stage reaction on the tail gas material flow, the oxygen and the C1 to C4 alkyl alcohols in the first rotating packed bed so as to obtain a gas-phase reacting effluence I and a liquid-phase reacting effluence I, soon afterwards, discharging respectively from an exhaust port and a liquid draining port of the first rotating packed bed; (b) respectively introducing the gas-phase reacting effluence I obtained in the step a, a second whiffof oxygen and an absorption liquid into a second rotating packed bed from an air inlet and a liquid inlet of the second rotating packed bed; in the conditions with the temperature of minus 10 DEG C to 100 DEG C, the pressure of 0.1 MPa to 2.0MPa and the gas liquid ratio of (10-800):1, reacting the residual nitric oxide in the gas with an absorbed solution in the rotating packed bed; and finally evacuating the reacted gas from the exhaust port of the second rotating packed bed; therefore, the problems are better solved; and the technology and the equipment can be applicable to the industrial production of recycling the nitric oxides and purifying the tail gas.

Description

technical field [0001] The invention relates to a process and equipment for recovering nitrogen oxides and purifying tail gas, in particular to a process and equipment for recovering nitrogen oxides and purifying tail gas in the process of producing oxalate through CO coupling. Background technique [0002] Oxalate is an important organic chemical raw material, which is widely used in the fine chemical industry to produce various dyes, medicines, important solvents, extractants and various intermediates. In the 21st century, oxalate, as a degradable and environmentally friendly engineering plastic monomer, has received extensive international attention. In addition, oxalic acid can be obtained by normal pressure hydrolysis of oxalate, and oxalamide can be obtained by normal pressure ammonia solution. Oxalate can also be used as a solvent to produce pharmaceutical and dye intermediates, etc., such as various condensation reactions with fatty acid esters, cyclohexylacetopheno...

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Problems solved by technology

Patent CN200610028186.7 discloses a method for removing alkyl nitrite and nitrogen oxide gas in the exhaust gas. In this method, the exhaust gas stream is first sent to the alkyl nitrite recovery tower and absorbed by alkyl alcohol. The alkyl nitrite in the exhaust gas is recovered to obtain the alkyl alcohol solution of the alkyl nitrite; the treated exhaust gas stream is sent to the catalytic reduction reactor, and the unabsorbed alkyl nitrite and nitrogen oxides The gas reacts with the reducing gas under the action of the supported catalyst to form N 2 , the temperature of the catalytic reduction reaction is controlled at 200-600°C, the pressure is controlled at 0.05MPa-1MPa, the energy consumption of the present invention is high, and the nitrogen oxide removal process in the exhaust gas is difficult to control

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