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Method for preparing concentration liquid of ammonium nitrate

A technology of ammonium nitrate solution and ammonium nitrate, applied in the direction of separation method, ammonium nitrate, chemical instruments and methods, etc., can solve the problems of decreased secondary steam utilization efficiency, increased product energy consumption, and reduced operating pressure requirements, etc., to achieve Save investment and operating costs, low nitrogen loss, low nitrogen loss effect

Inactive Publication Date: 2007-02-07
太原海力丰科技发展有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At this time, it is more reasonable to use low-level secondary steam to evaporate low-concentration washing liquid (ammonium nitrate 180°C) and increase the energy consumption of the product
[0004] With the adoption of modern nitric acid technology, the acid concentration used to produce ammonium nitrate tends to increase, so that the operating pressure requirements of the reactor will be reduced, and the efficiency of secondary steam utilization will be further reduced

Method used

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  • Method for preparing concentration liquid of ammonium nitrate

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Embodiment approach 1

[0024] The nitric acid and ammonia of the present invention enter the tubular reactor 3 from the nitric acid inlet 2 and the ammonia inlet 1 respectively, and carry out a pressure reaction under the control of the pressure controller 5, and the generated ammonium nitrate solution enters the mixer 4 and exchanges from the first-stage evaporation. The circulating ammonium nitrate solution of the heater 11 is mixed to control the temperature, and then the mixed ammonium nitrate solution is flashed by the flash evaporator 7, preheated by the preheater 8 and separated by the separator 10, and then sent out by the hot ammonium nitrate solution pump 6. Then it is concentrated by the first-stage evaporative heat exchanger 11, the second-stage evaporative heat exchanger 13 is concentrated, the first-stage separator 12 is separated, and the second-stage separator 14 is separated. Finally, the concentrated ammonium nitrate solution 15 containing 96%-99.7% is sent down Granulation is carried ...

Embodiment approach 2

[0029]The present invention uses nitric acid with a concentration of 60% and a temperature of 40°C and ammonia with a concentration of 99.6% and a temperature of 20°C as raw materials, reacts at 0.61Mpa(abs) and 185°C, and produces 99.7 through flash evaporation, preheating and two-stage evaporation. % Concentrated ammonium nitrate solution to reach 300,000 t / a high-density product capacity scale. Investment can be saved by 22.65%, operating costs (solution preparation part) reduced by 60% (including: electricity consumption increased by 165%, steam consumption decreased by 95.2%, cooling water consumption decreased by 16.8%).

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Abstract

This invention discloses a preparation method for concentrated ammonium nitrate solution, which is characterized by (1) enhancing atomization at the nitric acid inlet by tubular reactor and increasing reaction rate and efficiency, (2) controlling reactor pressure higher than saturated vapor pressure according to different water conternt in nitric acid, therefore producing no secondary steam, avoiding drop formation from flash separation after reaction, and reducing investment cost markedly, and (3) totally taking advantage of reaction heat to prepare 96-99.7% ammonium nitrate according different requirements under different reaction temperature and different cycle temperature differences of ammonium nitrate and different vacuum degree, wherein the reaction heat is from vacuum-flash ammonium nitrate solution heated by 180-185DEG C ammonium nitrate with lower concentration. The invention is specifically applicable for high concentration nitric acid as raw material and preparation of high density ammonium nitrate.

Description

Technical field [0001] The invention relates to a method for preparing an ammonium nitrate solution, in particular to an ammonium nitrate concentrate prepared by only using the ammonium nitrate reaction heat. Background technique [0002] A pressurized tubular reactor is used to produce ammonium nitrate solution, such as the patent with the publication number CN86105683, titled "Preparation Method of Concentrated Ammonium Nitrate Solution". For example, the publication number is CN1182636, and the patent is titled "Reactor, Method and Equipment for Manufacturing Ammonium Salt". Although the use of a pressurized tubular reactor solves the safety problem of the atmospheric volumetric neutralization reactor and improves the utilization rate of the secondary steam, the reactor efficiency is still low (ammonia conversion rate is 98.02%), and the reaction process It is easy to produce smoke, poor operability and load adaptability. The reaction is operated under the boiling pressure of ...

Claims

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Application Information

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IPC IPC(8): C01C1/18B01D1/00
Inventor 武晋强台念强赵正权陈赵锁
Owner 太原海力丰科技发展有限公司
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