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Denitrification method and denitrification system for pyrolysis flue gas produced by steam cracking to produce light olefins
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A technology for cracking flue gas and low-carbon olefins, applied in separation methods, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as unfavorable industrialization, large hydrogen consumption, huge cost, etc. The effect of oxide content
Active Publication Date: 2019-08-20
CHINA PETROLEUM & CHEM CORP +1
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[0003] The denitrification technology of pyrolysis flue gas mainly adopts the reduction method to reduce nitrogen oxides to denitrification. Among them, there is also a denitrification method using hydrogen as the reducing gas, but when hydrogen is used as the reducing agent, it is easy to react with oxygen in the denitrification environment, so that In order to obtain a better denitrification effect, a large amount of hydrogen needs to be consumed, which brings huge costs to flue gas denitrification, which is not conducive to industrialization
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preparation example Construction
[0040] These copper-zinc-zirconium catalysts, copper-zirconium catalysts and copper-zinc-aluminum catalysts as the copper-containing catalysts can be commercially available, or can be prepared by a conventional co-precipitation method in the art. The preparation of the copper-zinc-zirconium catalyst is as follows: For example, the preparation method of the copper-zinc-zirconium catalyst can include, for example:
[0041] Add the aqueous solution of alkali metal carbonate or bicarbonate to the aqueous solution of copper-containing compound, zinc-containing compound and zirconium-containing compound to obtain a solid phase, filter, wash with water, dry the washed solid phase, and place in an air atmosphere Roasting under the following conditions, the copper-zinc-zirconium catalyst can be obtained.
[0042] Wherein, the alkali metal carbonate may be, for example, one or more of sodium carbonate, potassium carbonate, sodium bicarbonate and potassium bicarbonate. The copper-contai...
preparation example 1
[0094] The copper nitrate containing 10% by weight, the zinc nitrate of 22% by weight and the zirconium oxychloride of 1% by weight are mixed aqueous solution 2000g, add in the 10% by weight sodium carbonate aqueous solution of 3000g of 80 ℃ under the situation of constantly stirring, filtered, washed with Na 2 The solid phase whose sodium ion content in O is lower than 0.01% by weight is dried at 120°C for 12 hours, granulated and calcined at 400°C for 8h, and pressed into tablets to obtain the finished catalyst copper zinc Zirconium catalyst CZZ1, its composition is: 30wt% CuO 65wt% ZnO 5wt% ZrO 2 .
preparation example 2
[0096] According to the method described in Preparation Example 1, the difference is that the mixed solution used contains 15% by weight of copper nitrate, 2.5% by weight of zinc nitrate and 3% by weight of zirconium oxychloride, thereby making the copper-zinc-zirconium catalyst CZZ2 , whose composition is: 65wt% CuO 10wt% ZnO 25wt% ZrO 2 .
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Abstract
The invention relates to a denitration method of cracked smoke produced by the steam cracking production of low-carbon olefins. The method comprises the following steps: 1, carrying out pressure swing absorption treatment on crude hydrogen obtained by cryogenic separation in a steam cracking process so as to obtain desorbed gas; 2, enabling the desorbed gas to carry out synthesis reaction under the presence of a cupreous catalyst so as to obtain first gas containing methanol, and enabling the first gas containing the methanol to carry out dewatering reaction under the presence of a dewatering catalyst so as to prepare second gas containing dimethyl ether; and 3, under the presence of a denitration catalyst, enabling the second gas containing the dimethyl ether to carry out contact reaction with the cracked smoke. The invention further provides a denitration system of the cracked smoke produced by the steam cracking production of the low-carbon olefins and the denitration method adopting the denitration system. The denitration method of the cracked smoke, provided by the invention, can use the gas containing the dimethyl ether for treating nitric oxides in the cracked smoke at a low cost, so that the content of the nitric oxides can be better reduced.
Description
technical field [0001] The invention relates to a denitrification method and a denitrification system for pyrolysis flue gas produced by steam cracking to produce light olefins. Background technique [0002] Due to the increasingly stringent national standards for environmental protection emissions, the emission of flue gas from the combustion device that provides heat for the steam cracking furnace, which is the core equipment of the ethylene plant, is becoming more and more stringent. It is necessary to oxidize the nitrogen in the pyrolysis flue gas The pollutants (NOx) can be further removed to meet the emission standards. Existing flue gas treatment technologies such as NH 3 -SCR technology is mainly used in flue gas treatment of thermal power plants, but NH 3 -SCR technology requires large investment, complex system, and may produce secondary pollution such as ammonia leakage. And the pyrolysis flue gas produced by ethylene production is mainly the flue gas produced ...
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