High Purity Tributyl Citrate Plasticizer

High purity tributyl citrate plasticizer is a citric acid ester of n-butanol, a colorless oily liquid that is soluble in most organic solvents. It is a non-toxic plasticizer that the suppliers of China provided. Manufacturers and factories in China use it to granulate non-toxic PVC and manufacture food packaging materials.

As a carboxylic acid ester of fatty alcohol, manufacturers and suppliers think it belongs to a carboxylic acid derivative and contains a carbonyl group. Therefore, high purity tributyl citrate plasticizer is a polar compound with a lower boiling point than the corresponding acid and alcohol. And it is similar to aldehydes or ketones with the same number of carbon atoms. It is volatile and has a fragrance.

Factoies and manufacturers can make citric acid ester react with water to produce citric acid and n-butanol. Its hydrolysis ability is less than that of acyl halides and anhydrides, but greater than that of amides. Suppliers and manufacturers in China regard these reactions as the replacement of H in the HOH molecule by acyl groups. Acyl halides and anhydrides have the strongest acylation ability, so factories and manufacturers often use it as acylating agents in organic synthesis.

Suppliers in China call the hydrolysis of esters in alkaline solution as saponification, because the higher fatty acid salts obtained by alkaline hydrolysis of oils and fats are soaps.

When esters react with alcohols under the catalysis of hydrochloric acid or sodium alcohol, then we generated another alcohol and ester. We call this reaction transesterification. It is also reversible. For example, triethyl citrate reacts with n-butanol to generate tributyl citrate and ethanol.

Fatty acid esters can react with ammonia to generate amides. For example, Tributyl Citrate(TBC) is acetylated to generate Acetyl Tributyl Citrate(ATBC).

High purity tributyl citrate can react with Grignard reagents to generate tertiary alcohols.

Acetyl tributyl citrate are easier to reduce than carboxylic acids. In synthesis, carboxylic acids are often reduced to alcohols through esters. The most commonly used reducing agent is sodium plus ethanol. The resulting alcohols are either the alcohol used in the original esterification or the primary alcohol generated by the reduction of the acyl group.

People heat citric acid and n-butanol in the presence of a small amount of acidic catalyst to generate a high-purity tributyl citrate plasticizer. The catalyst is dry hydrogen chloride, and a strong acid ion exchange resin. Also factories use concentrated sulfuric acid. We call this reaction as esterification. When esterification generates tributyl citrate, there are two possible ways for the dehydration of citric acid and n-butanol molecules. Studies have shown that the breaking of the chemical bond occurs between the acyl group and the oxygen. That is, the water generated during the reaction comes from the hydroxyl group in citric acid and the hydrogen bond in n-butanol.

Esterification is a reversible reaction. When equilibrium finished, there are a certain number of reactants and products. For example, when the same 1 mole of citric acid and 3 moles of n-butanol react in the presence of a small amount of sulfuric acid, when equilibrium occured, part of the citric acid and n-butanol become high-purity tributyl citrate plasticizer. Heating and adding catalysts can only accelerate the reaction rate, but have no effect on the composition of the equilibrium material.

In order to improve the yield, factories often add excess citric acid or n-butanol. Or people removed the generated water from the reaction mixture. If the boiling point of the generated ester is very low, manufacturers and suppliers in China can make the ester evaporate. However, the boiling point of tributyl citrate is 150°C, so we evaporated water first. In short, people destroyed the equilibrium to increase the yield. In industrial production, we use excess citric acid to evaporate the constant boiling mixture of high-purity tributyl citrate plasticizer and water. And then people continuously added citric acid and butanol to evaporate tributyl citrate and water for continuous production.

Citrate esters can react with ammonia to form amide. Tributyl citrate is acetylated to form CAS No 77 90 7 acetyl tributyl citrate.

Tributyl Citrate (TBC) is a colorless oily liquid, soluble in most organic solvents. And it has low volatility, high plasticizing efficiency, and is easily soluble in resin. It can increase the low temperature resistance, water resistance, and mildew resistance of the product. Tributyl Citrate is a non-toxic plasticizer that factories use it as a plasticizer in non-toxic PVC granulation. Also the applications are in food packaging, children’s toys, medical supplies, polyvinyl chloride, and vinyl chloride copolymer production.

All esters are more easily hydrolyzed in acidic or alkaline solutions than in neutral solutions. Because acidic solutions provide hydrogen ions, they can combine with polar carbonyl oxygen to make oxygen positively charged. So the π electron cloud is more transferred to oxygen. This make the carbonyl carbon positively charged and more prone to nucleophilic addition reactions. Even weaker nucleophiles, such as water, can undergo nucleophilic addition reactions. Without the catalytic effect of acid, the hydrolysis rate of esters is very slow. Manufacturers and factories must heat and add a catalyst for the hydrolysis reaction of esters.

The hydrolysis reaction of esters is a reversible reaction, and people can make the reaction complete in the presence of a large amount of water. Equimolar esters and water form a balanced mixture in acidic or neutral solutions, while in alkaline solutions, since hydroxide ions are strong nucleophiles, once carboxylic acids are generated, they immediately form salts with alkalis, destroying the equilibrium and allowing the hydrolysis reaction to proceed to the end.

Our factory has advanced production equipment, mature production technology, complete testing instruments and standardized analysis methods, and adopts the production process of continuous esterification, distillation separation, neutralization and water washing, so that the content of free acid and water in the product is low. Therefore, the product has high content, low acid value and water content, is not easy to hydrolyze, and has stable quality. This is deeply recognized by domestic and foreign customers.

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Related Links: CAS No 77 89 4, CAS No 77 90 7, CAS No 77 93 0, CAS No 77 94 1, Tributyl Citrate (TBC), High Quality Plasticizer TBC Tributyl Citrate