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[Chemical Knowledge]：The production and manufacturing method and process of recycled oil.

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The manufacturing method
of recycled oil
In the field of chemical production raw materials, the manufacture of recycled oil is an important link. As a sustainable and environmentally friendly energy source, recycled oil has attracted more and more attention. This article will detail the manufacturing method of recycled oil.

1. raw material preparation

the main raw material for the manufacture of recycled oil is waste oil, including kitchen waste oil, animal fat, industrial waste oil and so on. When selecting raw materials, ensure that the source of oil is reliable and pollution-free. In order to obtain high-quality recycled oil, strict testing and screening of raw materials are required.

2. pretreatment

pretreatment mainly includes impurity removal, dehydration and degumming steps to improve the quality of recycled oil. First of all, the impurities in the raw oil, such as metal chips, slag, etc., are removed by filtration, centrifugation and other methods. Next, moisture is removed by heating, vacuum, or the like to reduce the moisture content in the reclaimed oil. Finally, an appropriate amount of acid or alkali is added to precipitate the phospholipids and other colloidal substances in the oil to further purify the oil.

3. Transesterification

Transesterification is the core of the recycled oil manufacturing process. In this step, a transesterification reaction is performed between the feedstock oil and a low-carbon alcohol such as methanol or ethanol under the action of a catalyst to produce a fatty acid methyl ester or ethyl ester, I .e., a regenerated oil. Commonly used catalysts are acidic catalysts (such as sulfuric acid, hydrochloric acid) and basic catalysts (such as sodium hydroxide, potassium hydroxide). When selecting a catalyst, it is necessary to consider its activity, selectivity, stability and economy. The parameters such as temperature, pressure and alcohol-oil ratio should be controlled during the reaction to ensure the smooth progress of the reaction.

4. Post-Treatment
After
completion of the transesterification reaction, the resultant needs to be subjected to post-treatments including washing, separation, drying, and refining. First, the reaction mixture is washed with water to remove the catalyst and by-products. Next, products such as regenerating oil and glycerin are separated by distillation, extraction, or the like. Then, moisture in the reclaimed oil is removed by drying to improve its stability. Finally, the quality of the regenerated oil is further improved by refining, such as removing pigments and odors.

5. quality inspection and storage

After completing the manufacture of recycled oil, it is necessary to carry out quality inspection to ensure that all indicators meet relevant standards. Common test items include acid value, peroxide value, density, viscosity, flash point, etc. For unqualified reclaimed oil, secondary treatment or waste is required. Qualified reclaimed oil should be stored in a cool, dry and ventilated place, avoiding direct sunlight and high temperature.

Through the above steps, we can manufacture high-quality recycled oil. The manufacture of recycled oil can not only improve the utilization rate of waste oil and reduce environmental pollution, but also provide a sustainable source of raw materials for chemical production. With the continuous progress of technology and the expansion of the scope of application, recycled oil will play an increasingly important role in the future production of chemical products.

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