What is the concept of green chemistry?

Atomic economy and "5R" principle are the core contents of green chemistry. Atomic economy refers to making full use of each atom in the reactant, so as to make full use of resources and prevent pollution. Five "R" principles of green experiment should be followed in the process of experiment, namely

1, reduction, reducing the use of raw materials, reducing the production and discharge of experimental waste;

2. Reuse, recovery and reuse;

3. Recycle and recycle resources, so as to realize "saving resources, reducing pollution and reducing costs";

4. Regeneration, turning waste into treasure and reusing resources and energy are effective ways to reduce pollution;

5. Rejection: Refuse to use toxic and harmful substances, and refuse to use some irreplaceable, non-recyclable, non-reusable raw materials that have toxic and side effects and will cause pollution. This is the most fundamental way to eliminate pollution.

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The Development History of Green Chemistry

In 1 and 1984, the United States Environmental Protection Agency (EPA) put forward "waste minimization", whose basic idea is to minimize waste by reducing waste generation and recycling waste, which initially embodies the idea of green chemistry. However, waste minimization can not cover all the concepts of green chemistry, it is just a chemical industry term, and it does not pay attention to the green chemical production process.

2. In 1989, the United States Environmental Protection Agency put forward the concept of "pollution prevention", pointing out that the waste produced in the workplace should be reduced as much as possible, including reducing the use of harmful substances and using resources more effectively, so as to protect natural resources and initially form the idea of green chemistry.

From 65438 to 0990, the United States promulgated the Pollution Prevention Act, which established pollution prevention as a national policy. The so-called pollution prevention means that no waste will be produced, so there is no problem of waste treatment: the word "green chemistry" first appeared in this bill, and it is defined as a technical process that uses the least resources and energy consumption and produces the least emissions.

4. 199 1 year, "green chemistry" became the central slogan of the US Environmental Protection Agency, and established the important position of green chemistry. At the same time, the Office of Pollution Prevention and Toxicology of the U.S. Environmental Protection Agency launched the research fund plan of "Changing the synthetic route to prevent pollution", with the purpose of funding research projects to prevent pollution in chemical design and synthesis.

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