Why Does Hydrotreated Paraffin Wax Still Have Odor? How to Optimize?

In the paraffin wax application industry, many customers prefer high-purity wax with no or minimal odor, especially for food-grade, pharmaceutical-grade, and cosmetic-grade products. However, even after hydrotreatment, some paraffin wax may still have a noticeable odor. Where do these odors come from, and how can product quality be further optimized?

Sources of Paraffin Wax Odor

Although hydrotreatment significantly reduces impurities, the following factors may still contribute to residual odors in paraffin wax:

1.Insufficient Hydrotreatment Process Optimization

•  Inadequate hydrogenation temperature or pressure, leading to incomplete removal of organic impurities.

•  Aging of hydrogenation catalysts, resulting in reduced desulfurization, denitrification, and deoxygenation efficiency.

•  Insufficient hydrogen purity, which may introduce trace odor compounds.

2.Raw Material Quality Issues

•  Feedstock containing aromatic hydrocarbons, sulfur compounds, or organic acids that are difficult to remove completely, even after hydrotreatment.

•  Oxidation reactions occurring during storage or transportation, leading to the formation of aldehydes, ketones, and carboxylic acids with noticeable odors.

3.Inadequate Post-Treatment Processes

•  Incomplete bleaching earth refining or activated carbon adsorption, failing to remove trace odor compounds effectively.

4.Storage and Transportation Factors

•  Residual odor-bearing substances in storage tanks and pipelines contaminating the final wax product.

•  Absorption of volatile organic compounds (VOCs) during transportation, increasing odor levels.

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