A Brief Introduction to the Development of ODS in Detergent Industry

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(1)Cleaning agentIndustry ODS Profile

Ozone (O3) is a gas that oxygen in the air becomes during discharge or under the irradiation of ultraviolet rays from sunlight. The ozone layer is a kind of ozone gas layer, which exists in the stratosphere 10km ~ 50km from the earth's surface. It can absorb most of the ultraviolet rays in the sunlight, so it can avoid the damage of ultraviolet rays to people and other creatures on the earth. Ozone is very easy to react with other substances, so it is also easy to be destroyed in chemical reactions.
In the 1970 s, two scientists in the United States first noticed that human-made CFCs may be related to the destruction of the ozone layer, and further discovered that CFCs released into the atmosphere will stay in the atmosphere for about 10 years., And eventually rise to the stratosphere. In the stratosphere, when exposed to ultraviolet light, chlorine atoms are separated from fluorine and chlorine atoms and react with ozone to decompose them into oxygen and chlorine monoxide; chlorine monoxide then reacts with free oxygen to form chlorine atoms to begin the next cycle. This reaction is repeated, so that a chlorine atom can destroy tens of thousands of ozone molecules, breaking the original dynamic balance of the ozone layer.

Over time, the amount of chlorofluorocarbons released into the atmosphere continues to increase, the amount of ozone decreases sharply, and the ozone layer becomes thinner and thinner, resulting in more ultraviolet light entering the biosphere on the earth's surface.
In fact, substances that destroy the ozone layer are not unfamiliar to us, and they are almost everywhere in daily life. Refrigerators, air conditioners, electronic products, fire-fighting equipment, tobacco, foam, hair spray, pesticides and other products in the production process or use process, people use a large number of artificial chemicals have the ability to destroy the ozone layer. Scientists refer to these chemical substances that destroy the atmospheric ozone layer and endanger the living environment of human beings as "ozone depleting substances" (ozone depleting substances), referred to as ODS.
(2) Major ODS substances in the industry

At present, ODS in large use mainly includes the following types of substances: perchlorofluorocarbons: mainly used as refrigerants, cleaning agents and foaming agents; halons: mainly used as fire extinguishing agents; carbon tetrachloride: mainly used as additives and cleaning agents in chemical production; methyl chloroform: mainly used as cleaning agents; methyl bromide: mainly used as pesticides in agricultural planting, food storage or commodity quarantine; and hydrochlorofluorocarbons: mainly used as refrigerants, cleaning agents and foaming agents.
These substances have different abilities to destroy the ozone layer. In order to facilitate measurement, scientists have established the ozone layer destruction potential value (ODP value) for these substances through scientific experiments. Halons are the most ozone-depleting, followed by carbon tetrachloride, perchlorofluorocarbons, methyl chloroform, methyl bromide and hydrochlorofluorocarbons. If we want to protect the ozone layer, we must first reduce the emission of these man-made chemicals into the atmosphere.
Another: two kinds of flurion (I. e., chlorofluorocarbons CCl3F and CCl2F2) can destroy the ozone layer, mainly because these substances can release atomic chlorine as a catalyst to turn ozone into oxygen.
(3) Cleaning objects involved in ODS

China's ODS cleaning industry includes all companies that use ODS as a cleaning agent for electronics, post and telecommunications, aviation, aerospace, light industry, textiles, machinery, medical equipment, automobiles, and precision instruments. The two main ODS cleaners are CFC-113 and TCA.