Announcement ID: #252633
Published on 04-12-2023
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Description

They appear in different historical periods and have different meanings, but they are closely related, permeate each other, have continuity, and are endowed with new contents in their development process. Early human life depended more on the direct use of natural materials. Gradually, the natural properties of these substances can not meet the needs of human beings, so a variety of processing technologies have been developed to consciously and purposefully transform natural substances into new substances with various properties, and gradually put into practice on the scale of industrial production. Broadly speaking, any use of chemical methods to change the composition or structure of substances, or synthesis of new substances, belong to chemical production technology, that is, chemical

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