Last year, the “Implementation Opinions on the Development of Bio-energy and Bio-chemical Support Policies for Finance and Taxation†issued by the Ministry of Finance clearly stipulated “subsidy for raw material basesâ€. “The state encourages the development of unused land such as winter fields, saline-alkali lands, barren hills, and uncultivated land to build bio-energy and bio-chemical raw material bases to ensure that bio-energy and bio-chemicals have a stable source of raw material supply.â€
However, due to the shortage of land resources, when it comes to the development of bio-energy, the problem of shortage of bio-energy raw materials is generally encountered. Taking biodiesel as an example, in the past, China's biodiesel feedstock was mainly waste oil. In 2005, the annual output was maintained at 100,000 tons. In 2006, the biodiesel production was rapidly enlarged to 500,000 tons. Due to the limited amount of waste oil, a large city with a population of one million is only producing about 10,000 tons of waste oil each year. Ditch oil prices rose from 1,800 yuan per ton in early 2006 to over 3,000 yuan per ton. Some biodiesel projects want to use imported palm oil as raw material, while 1 ton of palm oil has risen to 3,500 yuan, compared to the market price of biodiesel of 5,000 yuan per ton, and compared with the price of standard petrochemical diesel of 5,700 yuan per ton, respectively. The cost advantage of diesel is also lost.
Elemental is a pure substance composed of the same element. The state in which an element exists in its elemental form is called the free state of the element. In general, the properties of elemental matters are closely related to the properties of their elements, especially chemical properties. For example, many metals are very metallic, then their elemental reducibility is very strong. The elementality of different types of elements, the difference in their properties is most prominently reflected in the structure. In contrast to elemental matter, pure substances composed of multiple elements are called compounds.
The element must be a pure substance composed of one element, so the mixture cannot be elemental. An element may have several elements, such as oxygen (O₂), ozone (O₃), tetrameric oxygen (O₄, a new type of oxygen molecule synthesized by a scientist in Italy), and red oxygen (O₈). Although any of these substances is elemental because they are pure substances composed of the same element, oxygen and ozone mixed together cannot be regarded as pure, it is a mixture of the same elements. In general, the properties of elementality are closely related to the properties of its elements. For example, many metals are very strong in nature, then their elemental reducibility is very strong. The elementality of different types of elements, the difference in their properties is most prominently reflected in the structure.
Elementary Substance,The Simple Substance, Pure Substance,Single Substance
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