Method of Making Acrylic Acid from Lactic Acid or Lactide Using Molten Salt Catalysts

Simple SummaryContent extracted from patent full text and abstract with AI.

This patent describes a novel method for producing acrylic acid from renewable sources such as lactic acid or lactide, using a three-step liquid-phase process with molten salt catalysts. Specifically, the process uses a protic ionic liquid containing bromide (Br-) for the first step, converting lactic acid to 2-bromopropionic acid. In the second step, another molten salt catalyst is used to convert this intermediate to 3-bromopropionic acid and some acrylic acid. Finally, an amine is used to convert the remaining intermediate into more acrylic acid. This process provides higher yields and selectivity than traditional single-step methods and enables the production of acrylic acid from bio-based, non-fossil resources.

Use CasesContent extracted from patent full text and abstract with AI.

• Manufacture of acrylic acid for use in superabsorbent polymers, such as those in diapers and hygienic products
• Production of acrylic acid-based adhesives, paints, coatings, and detergents from renewable feedstocks
• Sustainable, bio-based chemical processes for reducing dependence on fossil fuels in the chemical industry
• Production of environmentally friendly materials for packaging, construction, or consumer goods
• Processes for converting agricultural byproducts (sugars, lactic acid) into high-value chemicals

BenefitsContent extracted from patent full text and abstract with AI.

• Enables production of acrylic acid from renewable, non-fossil resources, supporting sustainability goals
• Higher yield and selectivity compared to previous single-step methods, improving process efficiency and economic viability
• Operates in the liquid phase, allowing for lower temperature and pressure compared to gas-phase processes, reducing energy consumption and safety risks
• Reduces greenhouse gas emissions and reliance on petroleum-based feedstocks
• Utilizes molten salt catalysts that can be tuned for optimal performance, potentially minimizing by-products and simplifying purification
• Facilitates the production of bio-based acrylic acid without significant process modifications to existing industrial infrastructure

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Inventors & Applicants

Patent Abstract

A method of making acrylic acid in liquid phase by contacting a feed stream containing lactic acid, lactide, or mixtures thereof with a molten salt catalyst comprising a protic ionic liquid (PIL), which contains a bromide anion (Br-), is provided.