1、Determination of salt out (crystallization) temperature of liquid

INTERNATIONAL STANDARD ISO 23381 Determination of salt out (crystallization) temperature of liquid fertilizers Détermination de la température de désolubilisation (cristallisation) des engrais liquides Reference 23381:2020(E) ISO 2020

2、Determination of SOT of “Liquid Fertilizers”

The temperature of a liquid fertilizer at which the salt content of the liquid exceeds its solubility. At this temperature, a solid phase begins to form, resulting in a mixture of solid particles and solution.

3、The solid

This work investigates liquid fertilizers’ chemical composition and the physico-chemical properties such as, crystallization temperature, pH, density, viscosity and corrosivity.

Liquid Fertilizers Based on Dolomite, Nitric Acid, and Ammonia

The chemical composition of solutions with crystallization temperature of 0°C was calculated. A technological scheme for production of liquid fertilizers containing nitrogen, calcium, and magnesium was proposed.

2014_ifa_moisture_determination

In phosphate fertilizers low temperature is required to prevent volatilization of non water molecules and waters of hydration. This methodology has been proven to be statistically-sound, yielding precise and accurate results repeatedly and consistently.

ISO 23381:2020 (en), Determination of salt out (crystallization

This document specifies the test procedure for the determination of the salt out temperature (SOT), also known as the crystallization temperature (CT) of liquid (fluid) fertilizers, using an inexpensive and simple technique.

Determination of salt out (crystallization) temperature of liquid

This document specifies the test procedure for the determination of the salt out temperature (SOT), also known as the crystallization temperature (CT) of liquid (fluid) fertilizers, using an inexpensive and simple technique.

SOLID–LIQUID EQUILIBRIUM IN LIQUID COMPOUND FERTILIZERS

N content in the liquid phase increased and crystallization temperature decreased with adding of NH4NO3(s) Basic properties of liquid compound fertilizers were determined

ISO/PRF 23381

This document specifies the procedure for the analysis of humic acids and hydrophobic fulvic acids which is applicable to dry and liquid materials used as ingredients in commercial fertilizers, soil amendments, and geological deposits.

Physical characteristics of fertilizer solutions

This is not merely a function of the low crystallization temperatures recorded in Table IV but is related to the rate of heat transfer from a bulk of several tonnes of solution, which in turn is dependent upon the temperature difference between the fluid and its environment.

The crystallization temperature of liquid nitrogen fertilizer typically refers to the temperature at which liquid nitrogen cools to its freezing point. Under standard atmospheric pressure, the freezing point of liquid nitrogen is approximately -196°C (-327°F).

1. Physical Properties of Liquid Nitrogen

First, it is essential to understand the basic physical properties of liquid nitrogen. Liquid nitrogen is a colorless, odorless, and tasteless low-temperature fluid with a boiling point around -196°C. When liquid nitrogen cools to this temperature, it begins to transition from a liquid to a solid state, a process known as freezing.

2. The Freezing Process of Liquid Nitrogen

When liquid nitrogen cools to its freezing point, it starts to solidify. This process is exothermic, meaning it releases heat to the surrounding environment. specialized equipment is required to control and regulate the temperature to maintain the stability of liquid nitrogen.

3. Measuring Crystallization Temperature

To measure the crystallization temperature of liquid nitrogen, high-precision thermometers and constant-temperature equipment are typically used. These tools ensure accurate temperature measurement and control, preventing liquid nitrogen from overheating or excessive cooling.

4. Factors Affecting Crystallization Temperature

Several factors influence the crystallization temperature of liquid nitrogen, including environmental temperature, equipment conditions, and operational methods. For example, high environmental temperatures may accelerate cooling rates, lowering the crystallization temperature. Conversely, excessively low environmental temperatures might prevent liquid nitrogen from reaching its freezing point, compromising crystal quality.

5. Applications of Crystallization Temperature

The crystallization temperature of liquid nitrogen has widespread applications in agriculture, medicine, and scientific research. For instance:

• Agriculture: Liquid nitrogen can be used for seed treatment to improve germination rates and growth speed.
• Medicine: It is employed in cryogenic treatments, such as organ preservation and tumor freezing.
• Research: Liquid nitrogen enables rapid sample freezing for subsequent analysis and study.

6. Precautions for Crystallization Operations

When using liquid nitrogen for crystallization, the following precautions should be observed:

• Safety First: Liquid nitrogen is extremely cold; ensure equipment and personnel safety.
• Temperature Control: Use professional devices to precisely regulate liquid nitrogen’s temperature, avoiding overheating or undercooling.
• Standardized Operations: Follow protocols strictly to prevent wastage or accidents due to improper handling.
• Environmental Monitoring: Closely monitor ambient temperature changes to ensure liquid nitrogen remains within the target range.

the crystallization temperature of liquid nitrogen is a critical parameter that directly impacts its effectiveness and safety. Strict temperature control is essential to guarantee the quality and performance of liquid nitrogen in practical applications.