SU65386A1 - The method of purification of coke oven gas from nitrogen oxides - Google Patents

Description

The need to remove nitrogen oxides from coke gas is dictated by the fact that nitrogen oxides, reacting with unsaturated hydrocarbons in the coke gas, form nitro resins capable of "hitting the fire in the helix exchange apparatus of the KoiKCOBoro gas separation unit.

According to the existing scheme, the removal of nitrogen and nitrogen is carried out in the following way: after removal of the main mass of benzene, naphthalene, and ammonia resin, the technolotin gas produced from coke ovens is removed from the hydrogen sulphide to Mohra desulfurization shop and then bye; stools in the dry desulfurization shop; in towers loaded with bog ore, where more hydrogen sulfide is removed and equipped: accbt of coke gas nitrogen oxides (the resulting iron sulfite binds OXIDES: ai30Tai of coke gas in form called salt Russina).

The coke oven gas, purified from nitrogen oxides, enters the gasholder, from where it is fed into the compressor with an exhaust pressure of 12 atm.

The compressed gas is washed in scrubbers with water and alkali, where carbon dioxide and hydrogen sulfide residues are removed. From here, the coke oven gas is directed to a separation unit, where as the coke oven gas (G1roi) cools, fractional condensation disappears. Condensation begins in the pre-cooled heat exchangers, then the gas passes through ammonia refrigerators, from where it reaches -45 ° C to deeply cooled sabin, where at temperature the gas is washed with liquid nitrogen to dissolve carbon monoxide.

The cabins are almost pure nitrogen-hydrogen with traces of carbon monoxide and oxygen, which pass in the opposite direction in the direction of the coke oven gas, recovers its cold and is compressed in the workshop of compressed gas to ammonia synthesis pressure.

Coke oven gas methods by reduction to elemental nitrogen are known (see, for example, aiBTOpCKoe certificate NO 48989, grade 26c1, 8).

The proposed method of purification of industrial gas from nitrogen oxides.

pic: a reduction of the latter to the elementary a.3ta, is that it was removed by palcTBopaiMM sulfamic acid (HaNSOsH).

According to the invention, it is proposed to remove nitrogen oxides by defining them to an elemental amount by introducing a sulfamic mislota into a mouse with a watered desulfurization soda solution or into an alkali circulating solution in the carbonate removal station.

In this case, the following reaction proceeds:

4NO –L Oa + 4NaOH + 4H2K8OzN 4NaHSO4 + 4N2 gb bNgO.

The speed of the defaq nitrogen oxides is very high and proceeds with the heating of the solution; the reaction proceeds practically completely iB npateo and with naphthylamine gives a negative reaction. The concentration of hydrogen ions in the medium, as shown by experiments, is practical: the effect of H) I1 on the rate of the process of de-stimulation is not.

As a model, illustrating the feasibility of combining the process of purifying coke oven gas from yzota oxides in a wet desulfurization shop or in a

carbon dioxide can be given the calculation of the consumption of sulphate-new acid required to clean 720,000 m of coke oven gas per day with a content of 15 pulses OK1I1SLov Nzot:

The required amount of nitrogen subjected to de: fvsatsik to elemental nitrogen will be:

15 720000

- 10.8 m / day.

6 10

According to Re, the AcIDII per 1 mole of NO per 1 is equivalent to 1 mole of sulfpminic acid, i.e. 47 kg per day.

Subject invention

Claims (2)

1. The method of purification of coke gases from nitrogen oxides by means of reduction of the latter to elemental nitrogen, that is, by the fact that the black light has been given Resolve the Sulfonic KIslots (HaNSOsH). 2. Acceptance of OPOSOBA; Item 1, characterized in that, when cleaning coke oven gas from sulfur or carbon dioxide, the usual sulfonic acid solution is added to a solution of sulfamic acid.