SU1305122A1 - Method for producing defoliant - Google Patents

Abstract

The invention relates to chemical technology of defoliants used in agriculture, and allows improving the quality of the product, simplifying the process, eliminating magnesium chloride losses, reducing energy costs and increasing productivity. To obtain defoliants, sodium chlorate in the fluid bed of the fluidized bed is applied to a 42-46% magnesium chloride solution at a fluidized agent temperature of 45-60 0. Sodium chlorate 9.2 kg / h with a moisture content of 2.1% is charged to the dryer and 160 pseudo-fluidizing agent with a temperature of 60 ° C. A 46% solution of magnesium loride in the amount of 8.7 kg / h is fed to the sodium chlorate layer by the nozzle. 16.3 kg / h of product are obtained in the form of granules with a size of 0.5-2 mm with a sodium chlorate: magnesium chloride ratio of 1: 0.95. с со о о СП 1чЭ rsD

Description

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The invention relates to chemical technology of inorganic substances, in particular chemical technology of defoliant based on sodium chlorate, used in agriculture.

The purpose of the invention is to improve the quality of the product, simplify the process, eliminate loss of magnesium chloride, reduce energy costs and increase equipment productivity,

The method is carried out as follows.

A 42-46% solution of magnesium chloride is applied to the fluidized bed of particles of crystalline sodium chlorate, and, for example, air with temperature AZ – BS C is used as the fluidizing agent.

When the concentration of the MgCl 2 solution is below 42%, for example, 40%, the exchange reaction between sodium chlorate and bischofite occurs throughout the indicated temperature range with the formation of sodium hydrogen chlorate, violation of the fluidization regime and a sharp deterioration in the quality of the product.

When the concentration of the solution is higher than 46%, for example, 46.7%, the loss of magnesium chloride sharply increases due to hydrolysis, in addition, the content of the fine fraction of bischofite not associated with sodium chlorate particles increases from 4% to 20%. impairs the quality of the defoliant.

When the temperature of the fluidizing agent is lower, for example, the rate of removal of released physical moisture due to the high relative humidity of the gas stream in the bed

so much so that the exchange reaction between sodium chlorate

and bischofite, magnesium chlorate is formed and magnesium is disturbed by fluidization. When the temperature is higher than 60 ° C, for example 65 ° C, bischofite hydrolysis begins with the formation of HC1 and its subsequent interaction (in the absence of a protective film of Na, CO) with sodium chlorate with the formation of chlorine oxide. The degree of hydrolysis reaches 4%.

Example 1. 4.1 kg of crystalline sodium chlorate with an initial moisture content of 2.1% is charged to a fluidized bed dryer. 4.25 kg of magnesium chloride solution with a concentration of 42% with a flow rate of 7.0 kg / h are fed to the fluidized bed of particles through the nozzle.

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As a fluidizing agent air is used with a temperature of 160,

The result is 7.8 kg of defoliant in the form of granules of a rounded shape with a size of 1-3 mm with a ratio of sodium chlorate and bischofite 1: 0.95. Physical moisture in the product is absent, the content of crystalline moisture corresponds to the composition of MgCli 6HjO.

The product does not float at a temperature not lower than 114 ° C, does not cake during storage for at least 12 months, the content of the active component in terms of six days of magnesium chlorate is 72%. Bischofite hydrolysis is absent.

Example 2 A crystalline sodium chlorate in the amount of 9.2 kg / h with an initial moisture content of 2.1% is fed to the fluidized bed dryer with a dosing unit. Under the gas distribution grid of the apparatus, air is supplied at a temperature of 160 m / h. A solution of magnesium chloride with a concentration of 46% in the amount of 8.7 kg / h is fed to the fluidized bed of particles through a nozzle.

In the final dose, 16.3 kg / h of defoliant are obtained in the form of round-shaped granules with a size of 0.5-2 mm with a ratio of sodium chlorate and bigahyte 1: 0.95.

Physical moisture in the product is absent, the content of crystalline moisture corresponds to the formula 4, ЗН20.

The product does not float at a temperature not lower than 120 ° C, does not cake during storage for at least 12 months, the content of the active ingredient in the product in conventional terms of magnesium water chlorate is 78.0%. Hydrolysis is absent.

Example 3. A solution of magnesium chloride with a MgClQ concentration of 44% is fed through a nozzle into a fluidized bed dryer in an amount of 7.6 kg / h. Here the dosing unit serves crystalline sodium chlorate with an initial moisture content of 2.1% in the amount of 7.65 kg / h. Under the gas distribution grid of the apparatus, air is supplied in the amount of 160 m h with temperature.

The result is 14.2 kg / h of defoliant in the form of granules of a rounded shape with a size of 1-3 mm with a ratio of sodium chlorate and bischofite 1: 0.95. There is no physical moisture in the product; the crystalline hydrate content is

moisture corresponds to the formula x x5, 3H, jO. The product does not float at a temperature not lower, does not bother. with storage for at least 12 months, the content of the active component in conventional terms of six-water magnesium chlorate is 75.1%. Hydrolysis is absent.

Example 4. A fluidized bed dryer is loaded with 4.0 kg of dry crystalline sodium chlorate. A solution of Magrat magnesium chloride 70.5% is fed to the fluidized bed of particles through a nozzle. Cumulative bischofit preparing as a result of hydrolysis at the stage of solution preparation and at a pressure of 9.6%. The HC1 formed during the hydrolysis of bischofite interacts with sodium chlorate to form chlorine and highly toxic and creating explosive concentrations with air of chlorine oxide. The sodium chlorine loss due to this reaction is 3.7%. In addition, chlorine, chlorine oxide and HC1 in the presence of water vapor cause active corrosion of the equipment. The content of a low-dispersed agent is used with air at a temperature of 160 m / h.

nor a concentration of 40%. Solution consumption 5.0 kg / h. As a pseudo-J5 persist fraction (dust) of a bipuphyte in

- product 24% of the total

applied bischofite. The product has as a result of an exchange reaction between lat chlorate and bioform with the formation of hexahydine magnesium chlorate already 3 minutes after the start of spraying, i.e. after applying 10.7% of the minimum required amount of bischofite, the particles are sug- gly. The proposed method allows to improve the mobility due to the melting of 25-25-30% of energy consumption for a yellowish color with frequent orange patches (the result of hydrola) and compresses when stored for 2 months, forming solid monoliths.

slope over the surface and after 5 minutes the fluidization regime is completely violated.

Example 5. Crystalline sodium chlorite in the amount of 9.8 kg / h with an initial humidity of 2.1% is fed to the fluidized bed dryer with a dosing unit. Under the gas distribution

emitting 1 ton of defoliant, increase productivity by 50-80%, eliminate loss of bischofite with its hydrolysis, reach 5%, increase the content of the active component in the product by 2-4.5% by eliminating hydrolysis and the absence of Na, 00, increase stability process, and also to exclude from the technological scheme

the lattice of the apparatus serves air at a temperature of 65 ° C in an amount of 50 m / h. 35 of the process, a stage of carbon dioxide spraying onto the fluidized bed of sodium chlorate particles through a nozzle serves a solution of magnesium chloride with a concentration of 46.7%, which corresponds to the melting of bischofite in its own crystalline moisture. Solution flow rate 9.1 kg / h

The result is 15.9 kg / h of defoliant in the form of a mixture of granules with a size of 0.25-2 mm and fine dust. The calculated ratio of sodium chlorate and bischofite is 1: 0.95. Physical moisture in the product is absent, the content of crystalline moisture corresponds to the formula MgCl Q 4, 2H, 0. The content of the active component in conventional terms for a six-grade chlorine Composer A Editor N. Gun'ko Tehred D. Kravch

Order 1378/18 Circulation 456 Subscription

VNIIPI USSR State Committee. For Inventions and Discoveries

113035, Moscow, Zh-35, Raushsk nab. 4/5

Production and printing company, Uzhgorod, st. Design,

Magnesium 70.5%. Cumulative bischofit preparing as a result of hydrolysis at the stage of solution preparation and at a pressure of 9.6%. The HC1 formed during the hydrolysis of bischofite interacts with sodium chlorate to form chlorine and highly toxic and creating explosive concentrations with air of chlorine oxide. The loss of sodium chlorate as a result of this interaction is 3.7%. In addition, chlorine, chlorine oxide and HC1 in the presence of water vapor cause active corrosion of the equipment. The content of the fine fraction (dust) of the bipuphyte in

applied bischofite. The product has the proposed method allows to reduce the energy consumption for a yellowish color with frequent orange specks (hydrolyte result) by 25-30% and it is caked during storage for 2 months, forming strong monoliths.

emitting 1 ton of defoliant, increase productivity by 50-80%, eliminate loss of bischofite with its hydrolysis, reach 5%, increase the content of the active component in the product by 2-4.5% by eliminating hydrolysis and the absence of Na, 00, increase stability process, and also to exclude from the technological scheme

the process of spraying sodium carbonate and simplify instrumentation.

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Claims (1)

Invention Formula A method for producing a defoliant by applying a magnesium chloride solution to a fluidized bed of sodium chlorate crystals, characterized in that a 42-46% solution is applied to improve product quality, simplify the process, eliminate loss of magnesium chloride, reduce energy consumption and increase productivity. magnesium chloride at a temperature fluidizing agent 45-60 C. I Proofreader M. Demchik