Biodegradable solvent

N-methyl-2-pyrrolidone Biodegradable solvent particularly for resins. 

Ethyl lactate has been suggested as a relatively nontoxic biodegradable solvent that is inexpensive. It can be made from renewable materials by a new fermentation process.211 Photoresists and organic contaminants can be removed with ozone in water in a process that uses no acids, hydrogen peroxide, or high temperatures while sav-... 

Tabs. [British Traders Shippen] Biodegradable solvent... 

One of the problems faced by recyclers of foamed PS, the kind most commonly used, is the very low bulk density of the materials. Compaction and baling are commonly employed to increase the bulk density, but the material is still expensive to ship for long distances. Recently, several companies have focused their efforts on transforming the PS foam into a gel, with a much higher density, to improve the transport economics. This method also can allow removal of contaminants by filtering the liquid material. One such company is International Foam Solutions, Inc., of Delray, Fla., which has developed STYRO SOLVE, a citrus-based biodegradable solvent for EPS foam and other PS products. The gel is diluted after it is received at... 

Habar, G. L., A. L. Pape, and C. Descusse, 1996. Microcapsules containing terpene orabietic acid derivatives as biodegradable solvents for use on chemical copying paper and pressure sensitive papers. Patent EP 714786 A1 19960605. 

Ethyl lactate is a nontoxic and biodegradable solvent derived from renewable carbohydrates. Its use and acceptance can be increased only if it is competitively priced to replace traditional organic solvents such as methylene chloride and chloroform. Argoime s National Lab developed a selective membrane technology for synthesizing ethyl lactate that eliminates the production of an equimolar amount of salt waste. The process uses pervaporation membranes and catalysts to directly convert the salts to esters, thereby eliminating the problem of salt waste. This approach reduces the product cost by half. The concept of pervaporation consists of the use of a membrane that selectively accepts one compound from a mixture of compounds it is explained in Chapter 6. 

The cost of waste disposal (water containing solvent at the solubility limit) was taken to be the cost of disposal of waste water as 0.75/gallon in a treatment facility for non-biodegradable solvents. The volume of waste water was the volume of steam condensate produced over one 20-minute cleaning cycle, expressed on an overall hourly basis. 

H. Kalita, M. Mandal, N. Karak, Biodegradable solvent-indnced shape-memory hyper-branched polyurethane, J. Polym. Res. 19 (2012) 1-8. 

Another biodegradable solvent, Rynex-3E, is based on dipropylene glycol eflier. It does not contribute to air pollution. It presents no danger to ground water. It can be used without risk to health and safety. 

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