Chemical News

Monday, September 15, 2008

Now acrolein is a “green” chemical

Biodiesel-derived glycerol continues to receive interest as a renewable feedstock for making chemicals that are normally derived from petrochemical feedstocks. For instance, the conversion of glycerol to propylene glycol is under development by Dow, UOP, Huntsman, and others. In a separate initiative, Dow and Solvay have independently developed technology for converting glycerol to epichlorohydrin. Now, Arkema is developing techniques to convert crude glycerol to acrolein. Acrolein has a small market as a commercial product; it is more important as an intermediate in acrylic acid production.

J.-L. Dubois, C. Duquenne, and W. Holderich of Arkema describe a process for manufacturing acrolein by dehydrating glycerol in the presence of oxygen. In the patent’s examples, the reaction is carried out in a tubular reactor maintained at 300 °C. The feed stream consists of glycerin, water, and oxygen in a mol ratio of 4.5:89.5:6.0; contact time over the solid catalyst bed is 2.9 s.

One of the catalysts tested was zeolite HZSM-5. Glycerin conversion ranged from 83 to 96%, and molar selectivity to acrolein ranged from 42 to 45%. Byproducts included hydroxyacetone, acetaldehyde, propionaldehyde, and acetone. Once acrolein is separated, it can be converted to acrylic acid via oxidation using conventional means

Source: CAS

2 comments:

alzack said...

I'm currently doing all of these research on a lab scale...mainly to improve some of the processing parameters...

Regulation Rita said...

National Recommended Final Water Quality Criteria for Acrolein

AGENCY: Environmental Protection Agency (EPA).

ACTION: Notice of availability of final criteria.

SUMMARY: Pursuant to section 304(a) of the Clean Water Act (CWA), the Environmental Protection Agency (EPA) is announcing the availability of final national recommended water quality criteria for the protection of aquatic life for acrolein. EPA's recommended section 304(a) water quality criteria provide guidance to States and authorized Tribes in adopting water quality standards for protecting aquatic life and human health and provide guidance to EPA for promulgating Federal regulations under CWA section 303(c), when such action is necessary.

What Are the Acrolein Criteria?

Freshwater: Freshwater aquatic organisms and their uses should not be affected unacceptably if the acute (one-hour average) concentration of acrolein does not exceed 3.0 μg/l more than once every three years on the average, and if the chronic (four-day average) concentration of acrolein does not exceed 3.0 μg/l more than once every three years on the average.

Saltwater: Saltwater criteria cannot be derived for acrolein at this time because of a lack of acute and chronic toxicity data.
FOR FURTHER INFORMATION CONTACT: Dr. Frank Gostomski, Health and Ecological Criteria Division (4304T), U.S. EPA, 1200 Pennsylvania Ave., NW., Washington, DC 20460; (202) 566-1105; gostomski.frank@epa.gov.

This information came from http://www.FederalRegister.com