The Application of Phosphoric Acid in food indurstry and is it bad for us?


What is Phosphoric Acid?

Phosphoric acid is one of the most popular acids that is used in many industries, especially in the manufacturing of fertilizers. The salts of this acid which are known as phosphates are used mainly in agriculture and even at home. Students might even hear this term often in their chemistry classes. Therefore, we will learn about this chemical compound and understand various things related to it here on this page.

Phosphoric acid falls into the category of weak acids. It is also referred to as orthophosphoric acid which helps us to easily distinguish it from other phosphoric acids such as polyphosphoric acid. Another name for this acid is phosphoric(V) acid. Phosphoric acid’s formula is written as H3PO4. This acid is a non-toxic acid and in its pure form, it is a solid at room temperature. It has a molar mass of 97.99 g/mol.

H3PO4 is one of the most important and useful mineral acids. The acid is mostly available in the form of an aqueous solution (almost 85%) and is odorless, colorless, and non-volatile liquid. The solution is a sticky liquid and even though this acid is categorized as a weak acid it can still cause irritation or burns in the skin as well as damage to the eyes and membranes in the nose.

Phosphoric Acid Properties

Below we will look at the chemical and physical properties of H3PO4.

Physical Properties

• Pure phosphoric acid is normally in the form of a white crystalline solid.
• It has a melting point of 42.4° C.
• The acid is colourless.
• It is also odourless and a viscous liquid with a density of 2.030 g.cm-3.
• H3PO4 is non-toxic and non-volatile.

Chemical Properties

• Phosphoric acid or H3PO4 can release up to three H+ ions. Due to this property, it can react differently in comparison to other mineral acids.
• Reaction with bases usually results in the formation of three classes of salts.
• When the molecules of phosphoric acid are exposed to high temperatures it forms dimers, trimers and even long polymeric chains as seen in poly phosphoric acids and meta-phosphoric acids.

Preparation Of Phosphoric Acid

Phosphoric acid is usually prepared or manufactured using two different processes. These include:

a) The ‘wet’ process.

b) Thermal process.

We will look at the process in detail below:

(a) Wet Process

During the wet process, phosphoric acid is produced from a naturally occurring crystal rock known as fluorapatite which contains the phosphate mineral. This compound is reacted with concentrated sulphuric acid and water. When the reaction takes place it results in the formation of phosphoric acid and calcium sulfate (gypsum) as well as some insoluble impurities. The extra chemical compounds and impurities are removed by the process of filtration and evaporation. The acid is then concentrated to ca 56-70% P2O5 (super phosphoric acid) using vacuum distillation. The reaction can be represented as:

Ca5(PO4)3Cl + 5H2SO4 + 10H2O → 3H3PO4 + 5CaSO4·2H2O + HCl

The product from the ‘wet process’ acid is impure but can be used, without further purification, for fertilizer manufacture.

(b) Thermal process

Another method that is used in obtaining phosphoric acid is the thermal process. In this, phosphorus is heated or burnt at high temperature in the presence of air. The burning results in the generation of phosphorus pentoxide which is then condensed to form a white powder. It is then hydrated in a separate process to obtain phosphoric acid.

Sometimes steam is also added to the burner where a condensed form of polyphosphoric acids is produced. The products are then directly passed into a hydration tower where the gaseous phosphorus oxide is absorbed and phosphoric acid is obtained. Nonetheless, a purer product is obtained in the first process.

Phosphoric Acid Uses

Phosphoric acid is one of the most popular chemical compounds that have several uses in different industries and even in products that we consume. Here are some popular uses of H3PO4.

In Agriculture

One of the most common uses of phosphoric acid is in the agriculture domain. It is widely used in the production of fertilizer and as a flavouring agent in animal or poultry feed.

In Dentistry

It is also used in dentistry where dentists often use the chemical compound as an etching solution and for cleaning the teeth. Phosphoric acid is also found in mouth cleaning products. Alternatively, phosphoric acid is found in anti-nausea medicines.

Treatment of Rust

Phosphoric acid is also used in treating rusts and removing them from metal components. It is used in the process of the phosphate conversion coating. This helps in corrosion resistance.

Skincare Products

Phosphoric acid mostly used in adjusting or controlling the pH level in skincare products. It is used in toothpaste, soaps, and detergents as well.

In The Food And Beverage Industry

Phosphoric acid is often used as a food additive and is mainly utilized to acidify foods and beverages. It helps in creating a certain taste.

Other Applications

• It is used in phosphoric acid fuel cells.
• Production of activated carbon.
• Compound semiconductor processing.
• It is used in sanitizing brewing and dairy industries.

The Application of Phosphoric Acid in food indurstry

Ever look at the ingredient list on your favorite soda? Chances are, you’ll see phosphoric acid. It’s a common additive in many processed foods. Manufacturers use it to add flavor and maintain freshness.

It gives soft drinks a tangy flavor and prevents the growth of mold and bacteria, which can multiply easily in a sugary solution. Most of soda’s acidity also comes from

Trusted Source

Phosphorus helps your muscles recover after a hard workout. The mineral plays a major role in the body’s growth and is even needed to produce DNA and RNA, the genetic codes of living things.

Phosphorus is first turned to phosphorus pentoxide through a chemical manufacturing process. It’s then treated again to become phosphoric acid.

It’s actually more common to have too much phosphorus than not enough. Phosphorus is found naturally in many foods and phosphoric acid is used as an additive, so most people get enough in their diet.

Your body needs phosphorus, but too much of it can cause problems. StudiesTrusted Source suggest that excessive phosphorus intake can put you at risk for osteoporosis and heart disease. Calcium and phosphorus work together to form and maintain healthy teeth and bones. The minerals need to be balanced in order to be effective.

Too much phosphorus can decrease the amount of calcium in your body, leading to bone loss. It can also impair your body’s ability to use other minerals, such as iron, zinc, and magnesium.

For example, research links high consumption of soda to an increased risk of bone fractures. In one observational study, people who drank soda daily doubled their risk of breaking a bone.

Your kidneys help your body get rid of excess phosphorus. Some people with chronic kidney disease may need to monitor the amount of phosphorus in their diet, because their kidneys may be unable to remove excess phosphorus.

Phosphoric acid is dangerous if you come into contact with it as a chemical substance. The toxic fumes can irritate your skin, eyes, and respiratory system.

The recommended daily amount (RDA) of phosphorus needed for normal bodily function in adults is 700 mgTrusted Source. You can get this easily from natural food sources.

Foods that are high in protein (e.g. dairy, meat, beans, eggs, chicken, and fish) are usually high in phosphorus. Bread and other bakery goods also contain the nutrient. This means additional phosphoric acid from processed food and drinks is likely more than the body needs.

Phophorus that’s added to products like soda is also very easy for your body to absorb. This can make it easy to get too much phosphorus.

Because so many of us drink sodas and eat processed foods, some expertsTrusted Source are concerned about the American diet when it comes to added phosphorus. Phosphorus additives make up somewhere between 10% to 50%Trusted Source of phosphorus intake in a typical Western diet, according to estimates.

Some estimates suggest that a can of cola contains 50 to 60 mgTrusted Source of phosphoric acid. Some flavored waters can contain up to 85 mg of phosphorus per bottle.

For most adults, a phosphorus intake of 4,000 mgTrusted Source per day is considered to be the safe upper limit. People who take in more than this amount are considered at risk for negative health effects associated with phosphorus.

Adults with acute kidney failure are recommended to have no more than 800 mgTrusted Source of phosphorus a day. Kidneys help the body get rid of extra phosphorus, but too much phosphorus can build up in the blood if they’re not functioning well.

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Guizhou Hectogoal Technology Co., Ltd.
Guizhou Hectogoal Technology Co., Ltd. is a new chemical industry technology service company, the company is jointly operated by a group of young and energetic young people. The company's main business is to provide food grade phosphorus chemical raw materials and other chemical raw materials, serving food, scientific research, agriculture, animal husbandry, water treatment and other industries. Relying on the rich phosphate mineral resources in Yunguichuan and other provinces and the world's leading phosphorus chemical industry companies, the company provides customers with high-quality green phosphorus chemical products, and strives to create a healthy and sustainable better life.