Waste continued product application

Theoretically, it might also be possible to improve SMB performance by decreasing the separation yield in a similar way to batch processes with a waste fraction. This can be accomplished by interrupting the otherwise continuous product collection at the extract and/or raffinate port. However, the applicability of this method has never been investigated. 

Pultrusion is an automated process for continuous production of endless composite profiles of constant cross-section. It is the only fully continuous production method for profiles which is unreservedly regarded to be suitable for mass production. Specific chaxacteristics of the process are a fully automated process causing low labor costs, little waste, and no need for auxiliary material. Pultruded profiles are mainly stock articles with cylindrical or rectangular hollow cross-sections or L-, U-, T-, or H-shapes. The application of these profiles is widespread. Typical examples are window frames, reinforcing for concrete, stairways, fences, wires, exterior covering for railroad cars and container parts [10]. 

Chitosan is called the last biomass of the twentieth century, and is a material that waits further development as an extraordinary biomaterial in the twenty-first century. Chitin and chitosan, derived from shellfish waste, continue to be underutilized resources. We believe that to further their development as a resource, that there are needs for products of intermediate value easy to produce and which capitalize upon the unique features of chitin and chitosan. Fibers and films based on chitin or chitosan have considerable promise for medical textile applications. The commercialization of chitosan-based hemostatic bandages, such as Hemcon , represents a significant accomplishment in gaining the acceptance of chitosan as a biomaterial. 

Large amounts of agricultural waste products, such as corn cobs, are continuously provided in several developing countries. Xylan is considered to be a green polymer that may play an essential role in the renewability of waste products due to its biodegradable and biocompatible nature. Furthermore, as shown in this chapter, xylan presents particular properties that allow a wide range of applications. 

In the second part, specific case studies in which the aforementioned models have been applied are presented. The results of such application as well as their reliability are discussed. Toxicological studies in Italy, risk assessment of electronic waste in China, or disposal of bearing lamps in India are some examples of selected scenarios.We hope that the scientific community finds in this book a source of information and inspiration to continue the research on chemical additives contained in products around the world. 

The successes described above notwithstanding, synthetic chemistry in the 1990s was in large measure characterized by catalysis , which encouraged development of organocopper processes that were in line with the times. The cost associated with the metal was far from the driving force that was more (and continues to be) a question of transition metal waste. In other words, proper disposal of copper salt by-products is costly, and so precludes industrial applications based on stoichiometric copper hydrides. 

The greatest advantage is the electrocatalytic mode of oxidation. In chemical oxidations the reduced form of the oxidant is obtained as by-product. This needs a careful waste treatment to prevent pollutional problems or it has to be regenerated in an additional reaction. At the nickel hydroxide electrode, however, nickel oxide hydroxide is continuously reformed from the hydroxide, so that only electric current is used as reagent. This makes this oxidation also of interest for technical applications. 

---