Brazil production/yield

Human activity, particularly in the developing world, continues to make it more difficult to sustain the world s biomass growth areas. It has been estimated that tropical forests are disappearing at a rate of tens of thousands of hm per year. Satellite imaging and field surveys show that Brazil alone has a deforestation rate of approximately 8 x 10 hm /yr (5). At a mean net carbon yield for tropical rain forests of 9.90 t/hm yr (4) (4.42 short ton /acreyr), this rate of deforestation corresponds to a loss of 79.2 x 10 t/yr of net biomass carbon productivity. 

Activated alumina and phosphoric acid on a suitable support have become the choices for an iadustrial process. Ziac oxide with alumina has also been claimed to be a good catalyst. The actual mechanism of dehydration is not known. In iadustrial production, the ethylene yield is 94 to 99% of the theoretical value depending on the processiag scheme. Traces of aldehyde, acids, higher hydrocarbons, and carbon oxides, as well as water, have to be removed. Fixed-bed processes developed at the beginning of this century have been commercialized in many countries, and small-scale industries are still in operation in Brazil and India. New fluid-bed processes have been developed to reduce the plant investment and operating costs (102,103). Commercially available processes include the Lummus processes (fixed and fluidized-bed processes), Halcon/Scientific Design process, NIKK/JGC process, and the Petrobras process. In all these processes, typical ethylene yield is between 94 and 99%. 

World oil-shale production fell from its peak of 46 Mt in 1980 to about 16 Mt in 2000 (Brendow, 2003). At present, about 69% of world oil-shale production is used for the generation of electricity and heat, about 6% for cement production and other industrial uses, and 25% is processed into shale oil. Oil shale has been burned directly as a very low-grade, high-ash-content fuel in a few countries, such as Estonia, which is also the only country in Europe where oil shale is of any importance. With a yearly production of about 14 Mt, oil shale still generated more than 90% of the electricity in Estonia at the time of writing, and also most of Estonia s 7000 b/d oil production comes from oil shale. Other countries where surface retorting of oil shale has been used for many years to yield shale oil are Brazil and China, which produced 3100 b/d and 1500 b/d in 2002,... 

There is a need for continued increases in yields not only to feed a growing world population, but also for greater fuel production (OECD-FAO, 2007). For example, US ethanol production, predominately based on corn, is expected to double between 2006 and 2016 (Figure 1.1). By 2016, ethanol is expected to represent a full one-third of corn production. Corn used for fuel in China is expected to increase from 3.5 million tons in 2006 to 9 million tons in 2016 (Figure 1.2). Ethanol production in Brazil is predominately based on sugarcane and is expected to increase by 145% between 2006 and 2016 (Figure 1.3). 

Geigy started production of simazine in 1956 in Schweizerhalle, near Basel, Switzerland 2 years later, atrazine also was produced. Use of triazines for weed control to improve crop yields grew quickly, and a production facility was installed at McIntosh, Alabama in 1959. Smaller production units were operated in Mexico, Brazil, and Australia, and important development work by Geigy led to improved production processes. In 1970 a continuous process production unit was built by Geigy Agricultural Chemicals in the United States. 

Sugar production in Brazil dramatically increased after 1980 when the National Program of Alcohol was initiated to reduce dependence on petroleum imports. Over the past 20 years, sugarcane hectarage has doubled, yields have increased 50%, and ethyl alcohol production has tripled to more than 14 billion liters. A portion of these dramatic increases in Brazil is attributed to chemical weed control, which enabled better yield expression of new cultivars and improved use efficiencies in water and fertilizer. 

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