Environmental Protection

Researchers Find Catalyst for Greener Lactic Acid Option

From paint to diapers, manufacturers use acrylic acid from petroleum but now researchers in Asia say they have found a catalyst that can convert lactic acid into acrylic acid more selectively at lower temperatures.

Scientists are reporting the discovery of an environmentally friendly way to make a key industrial material — used in products ranging from paints to diapers — from a renewable raw material without touching the traditional pricey and increasingly scarce petroleum-based starting material.

Their report on a new catalyst for making acrylic acid appears in Catalysis, the newest in the American Chemical Society’s suite of 39 peer-reviewed scientific journals.

Weijie Ji of Nanjing University in Nanjing, China; Chak-Tong Au of Hong Kong Baptist University in Kowloon Tong, Hong Kong; and colleagues note that acrylic acid is essential for making paints, adhesives, textiles, leather treatments, and hundreds of other products. Global demand for the colorless liquid totals about 4 million tons annually. Acrylic acid is typically made from propylene obtained from petroleum. With prices rising, manufacturers have been seeking alternative ways of making acrylic acid without buying propylene. One possibility involves making it from lactic acid. But current processes for using lactic acid are inefficient, less selective, and require higher temperatures and the accompanying high inputs of energy.

The scientists’ potential solution is a new catalyst that can convert lactic acid into acrylic acid more efficiently. Lactic acid is a classic renewable starting material, produced by bacteria growing in vats of biomass such as glucose and starch from plants. In laboratory studies, the scientists showed that the new catalyst can convert lactic acid to acrylic acid more selectively at lower temperatures. This could mean better use of lactic acid, lower fuel consumption, and less impact on the environment, the scientists suggest.

The full article is available online. Click on the title “Efficient Acrylic Acid Production through Bio Lactic Acid Dehydration over NaY Zeolite Modified by Alkali Phosphates” to access it.

Source: American Chemical Society

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