Method for producing liquid dinitrogen trioxide
A technology of dinitrogen trioxide and dinitrogen tetroxide, applied in the directions of dinitrogen trioxide, nitrogen oxides/oxyacids, etc., can solve problems such as defects, and achieve the effects of high cost, complete reaction and high efficiency
Active Publication Date: 2012-06-27
ANHUI WANBEI COAL REFCO GRP LTD HANSHAN HENGTAI NONMETALLIC MATERIALS BRANCH
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Problems solved by technology
[0003] Dinitrogen trioxide is the acid anhydride of nitrous acid. Because nitrous acid is unstable, it is generally stored as sodium nitrite. It can be generated by strengthening the acid during use. Nitrous acid is widely used in chemical reactions, such as nitrosation and diazotization reactions. In the process of making nitrous acid from sodium nitrite, water and strong acid need to be added, and sodium ions come out after the reaction, so its application has certain limitations
But its production has flaws
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Embodiment 1
[0034] A kind of equipment for the method of producing liquid dinitrogen trioxide, comprises tubular reactor a1, thereafter successively connects intermediate separator a2, water cooler a3, tubular reactor b4, intermediate separator b5, water cooler b6, Tubular reactor c7, terminal separator 8 and water cooler c9; intermediate separator a2, intermediate separator b5 and the top outlet of terminal separator 8 are connected and then connected to water cooler d13, acid remover 14, compressor 15, Frozen brine cooler 16, ammonia cooler 17, reactor 18. The reactor 18 is a ceramic structured packing tower, the bottom of which is connected to an adjustment tank 19 .
[0035] The process of using this device is as follows:
[0036] ① mix crude dinitrogen tetroxide (mass fraction 92-96%) with dilute nitric acid (mass fraction 10%-18%) and enter tubular reactor a1;
[0037] ② In the tubular reactor a1, dinitrogen tetroxide reacts with water in dilute nitric acid to obtain nitric acid a...
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The invention relates to a method and equipment for producing liquid dinitrogen trioxide. One raw material used in the method is diluted nitric acid which is waste acid from a nitric acid device. The diluted nitric acid at the concentration is expensive to recycle and may cause environment pollution when discharged. The method disclosed by the invention can change this waste into a valuable material and is in accordance with national energy-conservation and emission-reduction policy. According to the method, liquid N2O4 serving as a raw material is reacted with NO to form dinitrogen trioxide, and the reaction which is a bubble type gas and liquid flow contact reaction is easier to operate and more complete than gas-gas flow reaction of NO and NO2.
Description
technical field [0001] The invention relates to a chemical production method and equipment. Background technique [0002] Dinitrogen trioxide is an acidic oxide, poisonous, soluble in benzene, ether, chloroform (chloroform), carbon tetrachloride (tetrachloromethane), unstable in acid and alkali, and can be decomposed into a nitrogen oxides and nitrogen dioxide. [0003] Dinitrogen trioxide is the acid anhydride of nitrous acid. Because nitrous acid is unstable, it is generally stored as sodium nitrite. It can be generated by strengthening the acid during use. Nitrous acid is widely used in chemical reactions, such as nitrosation and diazotization reactions. In the process of making nitrous acid from sodium nitrite, water and strong acid need to be added, and sodium ions will come out after the reaction, so its application has certain limitations. Using dinitrogen trioxide instead of nitrous acid for nitrosation and diazotization can be carried out in an anhydrous state, an...
Claims
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Inventor 陈林周皓
Owner ANHUI WANBEI COAL REFCO GRP LTD HANSHAN HENGTAI NONMETALLIC MATERIALS BRANCH