SU1606503A1 - Method of producing liquid nitrogen-containing fertilizers - Google Patents

Abstract

The invention relates to a technology for the production of mineral fertilizers, can be used in the nitrogen industry for the production of liquid fertilizers and allows to intensify the process while creating the possibility of precise adjustments. First, hot aqueous solutions of urea and ammonium nitrate are mixed, followed by cooling to 20-60 ° C, some of the mixture obtained is used as a correction solution, and water is introduced into the remaining part. An aqueous solution of urea uses concentrations of 67-73 wt.% At 70-120 ° C, and an aqueous solution of ammonium nitrate - concentrations of 78-88% at 80-150 ° C. The proposed method allows to intensify the process by reducing by 1.5-2 times the time spent on preparing a batch of commercial product. At the same time, the accuracy of adjusting the composition of the fertilizer according to the content of total nitrogen increases from 28.0 ± 0.4 to 28.0 ± 0.3%. 1 hp f-ly, 2 ill.

Description

This invention relates to a technology of mineral fertilizers and can be used in the nitrogen industry to produce liquid fertilizers.

The aim of the invention is to intensify the process while creating the possibility of precise adjustments.

According to the invention, aqueous solutions of single fertilizers are first mixed to form a mixture, then water is added to the latter to form a ready-mixed mixture, correction solutions are introduced into the ready-mixed mixture at 20-60 ° C, while a single-fertilizer mixture is used as a correction solution. -60 0.

The mass ratio of the finished mixture and the adjustment solution added to it when adjusting the correction solution is determined by the formula

O5 O

cl

about oz

k

1 - t

where k is the ratio of the mass of the concentrate to the mass of the finished mixture,

. t + t

t is equal to the maximum value of a number of values calculated by the equation- (Q

t. E mmni ho p „1 2 p) W V ..“. 1 ,, ... п;

X, X ||

X ,;

t, t G4

pV

U x, jj - x "

14

: I

tj is equal to the minimum value of | a number of values calculated by the equation: none

  X4 | ch

(i - 1,2, ... n)

CWOM t,

C2; g n ZZ ii cC

i - j -

n is the number of all single nitrogen fertilizers in a multi-

ponent liquid nitrogen

fertilizer; X, 4 - i-ro single concentration

nitrogen fertilizer in

ready mix;

40

H

1st single concentration

nitrogen fertilizer in concentrate; MMI; respectively, at least 45

 iwiebi and the maximum allowable concentration of i-ro single nitrogen fertilizer in the product} ate minimum and maximum

Maca allowable total concentrations of all single nitrogen fertilizers in pro-. Ducte .;

FIG. 1 is a schematic diagram of an installation for implementing the method proposed; in fig. 2 - graphic illustration of the calculation method

Q

five

0

five

0

0

45

l

five

mass ratio, in which the adjustment solution is mixed with the prepared mixture.

Mixer 1 (fig. 1) is designed to mix only the individual single nitrogen fertilizer jpacTBopoB with the formation of a mixture. Mixer 2 serves to mix it with water and add, if necessary, small amounts of ammonia (up to 0.1 - 0.5 wt.% In the mixture) and / or a corrosion inhibitor, for example ammonium phosphates (up to 0.2% based on ). Refrigerator 3 is designed to cool the finished mixture, and refrigerator 4 is designed to cool the mixture: hot water solutions of single nitrogen fertilizers (before adding water to it) to 20 -. Correction tanks 5 are installed to accumulate the finished

I mixture, as well as for the correction of its so .. by becoming the shipment to the warehouse or to the consumer as a finished product. In this case, tanks 5 alternately perform mutually complementary functions: when one of them accumulates and corrects the finished mixture, the finished product from the other is discharged to the warehouse.

The collection 6 is located after the refrigerator 4 and serves to accumulate a cooled mixture of single fertilizers used as a correction solution added to the tank 5 with the prepared mixture,

In collection 7, water is accumulated, which is used to prepare the mixture in mixer 2 and to adjust the finished mixture in tank 5 if it contains a shortfall of water.

The installation works as follows.

Suppose that it is necessary to prepare two-component liquid nitrogen fertilizer based on urea and ammonium nitrate YO, Aqueous solution of urea with a concentration of 67-73 May,% at 70-120 ° C and an aqueous solution of ammonium nitrate with a concentration of 78-88% at 80 -11) 0 s is continuously fed to the mixing in the mixer 1 Most of the mixture obtained follows: steps into another mixer 2, where it is continuously diluted with water to the desired condition. Here the mixture is prepared, aerated with ammonia, a corrosion inhibitor — ammonium phosphates — is added to it. Liquid nitrogen fertilizer - dvukhkompo.

51606503

An untoured nitrogen fertilizer based on urea and ammonium nitrate, which also contains 0, 5% by weight of free ammonia and about 0.2 phosphates, is further cooled to 30-50 seconds in refrigeration, the sum of the concentrations of the components m-: and {"in1 2 glcx chmng

Nymirovanna difference between the maximum and minimum allowable

the values of the sum of the concentrations of the components m-: and {"in1 2 glcx cmng

Nymirovanna difference between the maximum and minimum allowable

ke 3 and flows into the collection 5, equipped with mixing devices, where the ready mixture is accumulated first.

A smaller part of the mixture of single fertilizers is discharged through the cooler 4 into the collection 6 adjustment solution prior to the introduction of water into it, being oh. up to 20-60 co

After the finished mixture has been accumulated in one tank 5, its supply is switched to another tank 5, which by this time is released from the prepared components in the product, CWQCC 1

.Those. it is 2 times less.

FIG. 2. the range of permissible values of concentrations of single nitrogen fertilizers in the mixture according to the condition. has the form of a hexagon abcdef. Any- 15 fight point located at the specified

the content of nitrogen atoms in the product corresponds to the range of 27.93 - 28.51%.

As a result of mixing in the mass

 and a 87% aqueous solution of ammonium nitrate with a temperature of 120 ° C, a mixture was obtained containing

A part of it after cooling in the refrigerator 4 to 20-60 ° C was selected in collection 6 for use as a mix for mixing with water in mixer 2. After cooling in refrigerator 3, the mixture was prepared in the rego product. The composition of the finished 20 ratio of 0.92: 1 of the 72% aqueous mixture in tank 5 is measured, the carbamide solution is set with the temperature, if the deviation of the actual composition of the mixture from the nominal temperature is beyond the tolerance of the 1st frame. If necessary, adjustments are made, in the process of 25–37.1% urea and Xj2, 44.8% of the ammonium sum of the concentrations of urea and ach nitrate (cm, point 2 in FIG. 2), ammonium nitrate in the finished mixture adjusted to given values. This is carried out periodically.

reservoir 5 of the required quantity of the correction solution. The pains of a mixture of single fertilizers from the collector are part of the mixture of single fertilizers 6 (if there is an excess of water in the mixture) or water from the collection 7 (if there is a lack of it). After mixing in tank 5, a tank is obtained. After some time there is a left product. 52 tons of ready-made mixture started to feed it, the warehouse was kept. At this time, the correction mode of 30.2% of carbamide and x., 2 tikings switch another reservoir to 39.6% of ammonium nitrate (see point 1 ap 5. in Fig. 2).

Example. It is necessary to obtain a liquid nitrogen fertilizer, type KAS-28, containing, in addition to water, 30.5 ± 1.0% urea (first component,) and 40.0 ± 1.0% ammonium nitrate (second component, i 2). At the same time, the sum of dd °) concentrations of urea and ammonia does not satisfy the requirement for a millimeter nitrate of nitrate to be 70.5 + 0.5%. the concentration of urea and ammonium So we have (in the above 1 is saltpeter with Xd, + 30.2 + 39.6

 69.8, which is not included in the specified 50 interval 70-71.

Thus, the actual compliance with the requirements for the content in the finished mixture of each single nitrogen fertilizer separately (x "mn." - Chl "" l) ie. 29.5 30.2 31.5 and

terms):

n 2; chthy, 4

 HMWjS 39.0;

29.5%; x ,, “en 31.5%; 41.0%;

with NkvvH 70%; with gloss. 71%.

In this case, the normalized differences between the maximum and minimum allowable values of the concentrations of the individual components are

55

becoming a ready-made mixture of non-allowable and IMO deviates from its nominal composition, AND: its composition must be adjusted.

It is necessary to find the amount g of the correction solution, which should be added to G 52 tons of the finished mixture, so that the composition of the product meets the specified technical conditions. For

The number of nents in the product is CWQCC 1

.Those. it is 2 times less.

FIG. 2. The range of permissible values of concentrations of single nitrogen fertilizers in a mixture according to the condition is in the form of a hexagon abcdef. Any point located at

the content of nitrogen atoms in the product corresponds to the range of 27.93 - 28.51%.

As a result of mixing in the mass

 and a 87% aqueous solution of ammonium nitrate with a temperature of 120 ° C, a mixture was obtained containing

0.92: 1 ratio of a 72% aqueous solution of urea with a temperature of 37.1% urea and Xj2 44.8% of ammonium nitrate (see, point 2 in Fig. 2)

After cooling in the refrigerator 4 to 20-60 ° C, part of it was selected in collection 6 for use as a 0.92: 1 ratio of a 72% aqueous solution of urea with a temperature of 37.1% urea and 44.2% ammonium Xj2. nitre (see point 2 in Fig. 2),

I went to mix with water in mixer 2. After cooling in refrigerator 3, the mixture was ready to go into the correction solution. Most of the mixture of single fertilizer was Zervuar 5. After some time, 52 tons of the prepared mixture, containing 30.2% of urea and 2, 39.6% of ammonium nitrate (accumulated at point 1 in Fig. 2), accumulated there.

 adjustment solution. Most of the mixture of single fertilizer was Zervuar 5. After some time, 52 tons of the prepared mixture, containing 30.2% of urea and 2, 39.6% of ammonium nitrate (accumulated at point 1 in Fig. 2), accumulated there.

     °) The condition for Cs mMarny concentration of urea and ammonium nitrate with Xd, + 30.2 + 39.6

If you comply with the requirements for the content in the finished mixture of each single nitrogen fertilizer separately (x „mn.“ - Chl ““ l), i.e. 29.5 30.2 31.5 and

becoming a ready-made mixture of non-allowable and IMO deviates from its nominal composition, AND: its composition must be adjusted.

It is necessary to find the amount g of the correction solution, which should be added to G 52 tons of the finished mixture in order for the composition of the product to meet the specified technical conditions. To do this, it suffices to determine k g / G,: We calculate a series of t |

  2-x, i

"

| Z "ai -Ux, -,

. 70 (xu + xia)

Ua, + xe) - (x „+ x ,,)

70 (30.2)

 + 44.8) - (30.2)

02 J2 0,0165 (CM. Point M

in figo 2);

 Xtl

.1 0.7

11 |

 - 30.2 37.1 - 30.2

- -0.1014 (point K);

, x, g 39.0 - 39.6 Xfta -, 8 + 39.6

- 0.1154 (point L);

0.6 5.2

 From the calculated values of t, we choose the largest: t 0,0165 (i.e., select the point M in Fig. 2).

Next, we calculate a series of tj values

CfttXKc

- Z-. |

Tg

 - yy2 x, i - L, x, i

71 - (x

(x

+ X

")

- (x

1C

71 - (30.2 + 39.6)

(37.1 + 44.8) - (30.2 39.6)

 - 0.0992 Htochka N);

Hms X

 - x

31.5 - 30.2 37.1 - 30.2

1.3 6.9

0.1884 (point O);

t in m tsui - 41.0 - 39.6 X „-. 44.8 - 39.6

j 0,2692 (point P),

From the calculated values of tj, we choose the smallest C 0.0992 (that is, the point N).

Then we define

t i- ± - 0.0992

2 -

 0.0578

(ie, we divide the segment MN in half and find the point O of the composition of the finished product),

W -. G -T

0.0578

1 - 0.0578 0.0613 $ g kC 0.0613 - 52 3.18.

Thus, to 52 tons of the finished mixture you need to add 3.18 g of concentrate.

The composition of the finished product (point O in FIG. 2) after adjustment can be calculated by the formula

X

01 «« ((i 1,2, ..., p).

When n 2 we find x о х, + + t (x «, - х,) 30.2 + 0.0578 (37.1- 30.2) 30.6; hoi x, i + t (- х, в) 39.6 + 0.0578. (44.8 - 39.6) - ° 39.9, i.e. in the finished product, the concentration of urea will be 30.6%, and of ammonium nitrate - 39.9%.

: The composition of the prepared mixture containing more than two different single nitrogen fertilizers, for example, a three-component liquid nitrogen fertilizer (p 3) containing, in addition to water, 25 ± 1% urea (i 1), 35 ± 1% ammonium nitrate, is similarly adjusted. () and 12 + 1% ammonium sulfate (i 3), provided that the total concentration of all three single nitrogen fertilizers in the product is 72 ± 0.5%.

The application of the proposed method allows to intensify the process of preparing a multicomponent liquid nitrogen fertilizer by reducing the time and number of operations spent on adjusting the composition of the prepared mixture.

The proposed method of obtaining liquid nitrogen fertilizers in comparison with the prototype allows to intensify the process by reducing by 1.5 - 2 times the time spent on preparing a batch of a commercial product. At the same time, the accuracy of adjusting the composition of the fertilizer according to the total nitrogen content increases from 28.0 + 0.4 (prototype) to 28.0 i 0.3%,

Claims (2)

Invention Formula 1 A method of producing liquid nitrogen fertilizers, which includes mixing mountains. soda iodine solutions of carbamide, ammonium nitrate and cooling Ammonia Inhibitor / p prsvtl the resulting mixture up to 20-60 ° C, the introduction of corrective solutions to achieve the desired nitrogen content in fertilizers is very similar to the fact that, in order to intensify the process while creating an accurate adjustment, the solutions of urea and ammonium nitrate are preliminarily mixed and in the resulting; a mixture of solutions is injected with water, and as a correction solution, a previously prepared mixture is used, cooled to 20-60 ° C, 2. The method according to p. 1 about t l and h a- j y i and with the fact that water solution - I carbamide is used with a concentration of 67-73 wt.% At 70-120 s, and an aqueous solution of ammonium nitrate with concentrate -. the radio is 78-88% at 80-150 C. 1 29 30 3J JZ JJ J J5 35 57 3 39 W 4 / CodepjKOHue Nardamid (% ;, X; 0ue.Z Compiled by T. Dokshina Editor T, Lazorenko Tehred L.G. Khodanych Proofreader H, King Order 3527 Circulation 380 BEARS OF THE STATE COMMITTEE ON STATES AND OPENINGS AT THE SCST OF THE USSR 113035, Moscow, Zh-35, 4/5 Raushsk nab. Production and Publishing Combine Patent, g, Uzhgorod, st. Gagarin, 101 Subscription