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SPRAY DRYING FOR PRODUCTION OF INSTANT COFFEE
Table of Contents
Introduction    3
Process of Spray Drying    3
Significance of Spray Drying    5
Benefits of Spray Drying    5
Challenges of Spray Drying    5
References    6
Introduction
Spray drying is a method of production through which a dry powder is produced from a slurry or liquid by rapidly drying the mixture with a hot gas. This method is most commonly used for thermally sensitive material such as pharmaceuticals and food. This method has become a popular method for the production of instant coffee, as it is capable of producing fine dried particles out of the fluid material. This literature review based on several literary sources shall describe the process of spray drying for the production of instant coffee and shall discuss about the pros and cons of this method.
Process of Spray Drying
Instant coffee also known as soluble coffee or coffee powder is a beverage derived from brewed coffee beans. In order to produce instant coffee one of the most preferred methods these days are the process of spray drying, which is capable of extracting the coffee crystals from the slurry or fluid material (Leobet et al., 2019). The process is capable of producing spherical particles of nearly 300 micrometers and density of 0.22 g/cm^3.
To achieve this process of nozzle atomization is used. Liquid coffee concentrate is sprayed as a fine mist into very hot and dry air, which is nearly 480°F (Pérez et al., 2019). In this process, the water evaporates and the dried round crystals of coffee hit the ground. High-speed rotating wheels that are capable of rotating at 20,000 rpm process nearly 6000 pounds of solution per hour. Spray wheels are used to ensure that drying towers have a wide radius so that the atomized particles do not collect on...