Method of preparation of liquid nitrogen fertilizer

 

(57) Abstract:

The invention relates to the production of mineral fertilizers and can be used to produce liquid nitrogen fertilizers for production of liquid nitrogen fertilizers based on urea and ammonium nitrate, known as CAS. The method includes mixing a certain proportion of the initial flow of water and ammonium nitrate solution with a stream of other nitrogen-containing substances such as urea solution. In the preparation of fertilizers in the gas phase and the released ammonia, which catch by washing the gas phase source water flow and/or flow of the solution of ammonium nitrate. It consumes not less than 100 kg of water and/or at least 500 kg of a solution of ammonium nitrate per 1 kg of ammonia contained in the gas phase. After contact with a gas phase stream of water or solution of ammonium nitrate containing free ammonia, return on mixing. 2 C.p. f-crystals.

The invention relates to the technology of mineral fertilizers and can be used to produce liquid nitrogen fertilizers based on ammonium and other nitrogen-containing substances.

A known method of preparation of nitrogen fertilizers, including what they are absorbent, containing water and/or ammonium nitrate [1]

Amakatarina gas phase is formed in the process of preparing an aqueous solution of urea and contains 30 to 45% of NH3(the rest of CO2N2H2O, H2). The gas phase enters the scrubber-Converter with a nozzle of Raschig rings, which is irrigated by the absorbent recirculating solution of ammonium nitrate, acidified with nitric acid. The rate of circulation of the solution of ammonium nitrate is 10 to 15 volumes to 1 volume of the output solution, which corresponds to 115 kg 62%-aqueous solution of 1 kg of absorbed ammonia. Inert gases are then fed in above the washer, irrigated ductless recirculating condensate as absorbent. Exhaust condensate at the outlet of the scrubber is divided into 2 parts. A large portion is returned to the scrubber for recirculation, and lower flows from washer located below the scrubber-Converter where it mixes with the recirculating solution of ammonium nitrate. Inert gases are cleaned in the washer sprays nitrate from ammonia or nitric acid vapor, produced in the atmosphere.

The disadvantage of this method is the need for multiple recirculates.eurydice incomplete wetting of the geometric surface of the nozzle due to the lack of irrigating liquid (absorbent) and/or increasing the temperature of the adsorbent to its boiling point due to heat radiated by dissolving ammonia in the absorbent or neutralizing ammonia nitric acid, contained in the absorbent material.

To avoid these adverse effects, without recirculation of the absorbent, it would greatly increase the flow of cleaning gas phase from ammonia, and this would create the problem of disposal of large quantities of spent absorbent.

The use of recirculation absorbent reduces the driving force of the process of mass transfer between immixture gas phase and an absorbent, resulting in lower degree of purification of the gas phase from ammonia.

The closest set of features and the technical nature of the proposed method is a method of cooking liquid nitrogen fertilizer comprising mixing specific proportions of the source streams of water and ammonium nitrate solution with a stream of other nitrogen-containing substances and the recovery of the ammonia produced in the process of making fertilizer in the gas phase by washing liquid absorbent containing water and/or ammonium nitrate [2]

In the mixing tank pour hot water and 75 82% solution of ammonium nitrate. As other nitrogen-containing substances through a distribution device located in the bottom of the tank, pass Patoka ammonium nitrate, into the tank simultaneously with nitrate can download the appropriate amount of solution of calcium nitrate or urea. So get ammirati based on ammonium nitrate and urea (or calcium nitrate). Eye-catching in the process of making fertilizer ammonia is sent to the scrubber to capture.

If we exclude the gaseous ammonia in the mixing tank and limited supply of water, ammonium nitrate solution and a solution of urea (as another addition to nitrate, nitrogen-containing substances), then the resulting mixture can be used as liquid nitrogen fertilizer CAS with low ammonia content (not more than 0.5 wt.). In this case, in the preparation of fertilizers also results in the release of ammonia in the gas phase, as applied to the production mix the urea solution always contains as impurities of 0.2 to 0.8 wt. of ammonia. Excretion of ammonia in the gaseous phase can also occur due to partial thermal decomposition of urea when in contact with a hot solution of ammonium nitrate.

The disadvantage of this method of cooking liquid nitrogen fertilizer is the use of imperfect tradition is ze way equivalent.

The present invention is the creation of an ecologically-friendly way of cooking liquid nitrogen fertilizer, in which the complete purification of exhaust gas from the ammonia released in the process of making fertilizer.

The solution of this problem is achieved by the known method of cooking liquid nitrogen fertilizer comprising mixing a certain proportion of the flow of water and ammonium nitrate solution with a stream of other nitrogen-containing substances and the recovery of the ammonia produced in the process of making fertilizer in the gas phase by washing liquid absorbent containing water and/or ammonium nitrate, according to the invention, the flushing gas phase expend not less than 100 kg of water and/or at least 500 kg of solution of ammonium nitrate per 1 kg of ammonia contained in the gas phase coming into contact with the absorbent, the absorbent partially or fully use the original flow of water and/or the original thread ammonium nitrate solution. Exhaust through contact with a gas phase absorbent is fed directly to the mixing or re-attach to the appropriate flow of water or solution ammiachnomu, the content of ammonia in the spent absorbent will not exceed 1 wt. when using water and 0.2 wt. when using ammonium nitrate solution, even if the absorbent material does not contain nitric acid. This allows you to provide sufficient driving force for the mass transfer process, including when the contact of the gas phase with the spent absorbent that is output in a scrubber.

Disposal of the spent absorbent in the process of cooking liquid nitrogen fertilizer can significantly increase the flow rate of the absorbent in the flushing gas phase and without its recirculation. Ultimately increases the driving force transfer between immixture gas phase and liquid abosrbent and increases the efficiency of cleaning of exhaust gases from the ammonia.

The amount of nitric acid in the absorbent supplied to the flushing gas phase support at a level that is insufficient for the neutralization of the ammonia contained in the gas phase coming into contact with absorbent material that provides partial or complete preservation of free ammonia absorbed in the spent absorbent. This eliminates the presence of HNO3spent absorbent and predotvrashayetsya gas phase acidified with condensate or acidified solution of ammonium nitrate, emitting into the gas phase nitrous acid vapour. The neutralization reaction occurring during the interaction of nitric acid vapor and ammonia in the gas phase leads to the formation of aerosol ammonium nitrate, which subsequently almost not captured by the absorbent. The most favorable conditions for aerosol formation occur at the inlet of the gas phase in the scrubber, as in this place the gas phase contains the maximum amount of ammonia.

Obviously, the driving force of mass transfer increases to the maximum, if the original stream of water or ammonium nitrate solution used to wash the gas phase as a whole.

In order to provide a more complete absorption of ammonia from the exhaust gas, the absorbent before serving flushing gas phase pre-cooled. The solubility of ammonia in the absorbent increases with decreasing temperature of the absorbent.

Application of the method of preparation of liquid nitrogen fertilizers, according to the invention, we illustrate on several examples.

Example 1. To install the cooking liquid nitrogen fertilizer are:

the flow of solution of ammonium nitrate from ammonium nitrate shop after ITN Converter is based acid;

the flow of water from the Department of ammonium nitrate in the form of condensate juice pair (after ITN) at a temperature of 95oC containing 0.5 wt. NH4NO3and 0.2 wt. HNO3;

thread another azotsoderzhashchei substances in the form of 74% aqueous solution of urea at a temperature of 95oC, containing as manufacturing impurities 0.3 wt. NH3and 0.3 wt. CO2.

To get liquid nitrogen fertilizer brand CAS-28, containing 28% nitrogen, these flows are mixed together in certain proportions, which use 15540 kg/h of a solution of ammonium nitrate, 1300 kg/h of condensate and 11800 kg/h of urea solution.

We consider two cases (A and B) the implementation of the method of preparation of fertilizer UAN-28 from the specified source flows.

Option A.

From the stream of water (1300 kg/h) as the absorbent selected 1000 kg/h of condensate, which is cooled to 45oC and used for flushing the gas phase in the amount of 40 kg/h containing 25 wt. NH3, 25% CO2and 50% H2O and formed by mixing the specified source flows. Leaching is carried out in a scrubber with a nozzle of Raschig rings. The gas phase is filed under the nozzle bottom. The top nozzle is irrigated by the condensate. Cleaned up the h), spent on irrigation nozzle scrubber exceeds 100 times the amount of ammonia contained in the gas phase (10 kg/h).

From the scrubber drains the spent absorbent in the number of 1010 kg/h containing in addition to water 0,75% NH4NO3and 0.94% NH3. The spent absorbent is attached to the remainder of the original stream of water directed to the mixture. From the hot liquid mixture is allocated gas phase containing 10 kg/h NH3, 10 kg/h CO2and 20 kg/h H2O and sent to a scrubber for washing. After mixing the received 28610 kg/h of liquid nitrogen fertilizer UAN-28 containing 30,52% CO(NH2)2, 39,28% NH4NO3, 0,091% NH3, 0,089% CO2. The fertilizer is then cooled to 45oC.

Option B.

From the stream of solution of ammonium nitrate selected 5000 kg/h of liquid for use as the absorbent. The absorbent is cooled to 55oC and serves for irrigation in the scrubber with a nozzle of Raschig rings. Under the cap in the scrubber enters the gas phase in the amount of 40 kg/h containing 25% NH3, 25% CO2and 50% H2O. the Number of solution of ammonium nitrate, used for irrigation nozzles in the scrubber exceeds 500 times the amount of ammonia contained in the gas phase (10 kg/h). PTS is operated absorbent at a temperature of 60oC number 5010 kg/h containing in addition to water 72.1% of NH4NO3and 0,145% NH3. The spent absorbent is attached to the remainder of the original stream of solution of ammonium nitrate allocated to the mix.

After mixing receive 28610 kg/h of liquid nitrogen fertilizer UAN-28, while in the gas phase can consist of 20 kg/h H2O, 10 kg/h NH3and 10 kg/h CO2.

Example 2

To install the cooking liquid nitrogen fertilizer serves:

the flow of solution of ammonium nitrate in the form of 91% aqueous solution at a temperature of 150oC, containing as impurities of 0.01 wt. free ammonia;

the flow of water at a temperature of 40oC;

stream 74% aqueous solution of urea at a temperature of 95oC, containing as manufacturing impurities 0,8 wt. NH3and 0.3 wt. CO2.

To get liquid nitrogen fertilizer brand CAS-32, containing 32% nitrogen, these flows are mixed together in certain proportions. To do this, use 11760 kg/h of a solution of ammonium nitrate, 875 kg/h of water and 11800 kg/h of urea solution. In the process of making fertilizer in the gas phase can consist of 20 kg/h H2O, 20 kg/h NH3and 10 kg/h CO2. Flushing the gas phase asiacell nitrate after cooling to 120oC. At the outlet from the first stage gas contains 20 kg/h H2O, 1 kg/h NH3and 10 kg/h CO2. The spent absorbent contains 0,17% NH3(when the initial concentration of 0.01% NH3). Thus ammonia is absorbed from the gas phase solution of ammonium nitrate by ordinary physical absorption. The consumption of the solution is 588 kg/h per 1 kg of ammonia contained in the gas phase coming into contact with the solution. The spent absorbent from the first stage of purification is then applied directly to the mix.

In the second stage of separation from the gas phase to remove the remains of ammonia. For irrigation scrubber guide the flow of water after cooling to 45oC. on 1 kg of ammonia contained in the gas phase coming into contact with water, it is necessary 875 kg/h irrigation water. After the second stage of purification of the gas phase is freed from ammonia completely by simple physical absorption and contains 20 kg/h H2O and 10 kg/h CO2. The spent absorbent water containing 0,11% NH3goes directly to the mix.

As a result of mixing all three streams, get 24405 kg/h of liquid nitrogen fertilizer UAN-32 containing 35.8% urea, 43.8% of glucouse mixing specific proportions of flows of water and ammonium nitrate solution with a stream of other nitrogen-containing substances and trapping of ammonia, eye-catching in the process of making fertilizer in the gas phase by washing with absorbent containing water and/or ammonium nitrate, wherein the flushing gas phase expend not less than 100 kg of water and/or at least 500 kg of solution of ammonium nitrate per 1 kg of ammonia contained in the gas phase coming into contact with the absorbent, the absorbent used partially or fully the initial flow of water and/or the original thread ammonium nitrate solution, worn out by contact with a gas phase absorbent is fed directly to the mixing or newly added to the residue corresponding source stream of water or of a solution of ammonium nitrate allocated to the mix.

2. The method according to p. 1, characterized in that the content of nitric acid in the absorbent supplied to the flushing gas phase support in an amount to provide the presence of free ammonia in the spent absorbent.

3. The method according to p. 1, characterized in that the absorbent before serving flushing gas phase pre-cooled.

 

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