Method for improving quality of phenolic materials in tar

Abstract

The invention provides a method for improving quality of phenolic materials in tar. The method is characterized by finally converting the phenolic materials into aromatic ethers through a two-stage conversion process. The method comprises the following steps: firstly mixing the tar with alkylation reagents and carrying out first-stage reaction under the action of a solid acid catalyst modified by alkali metal salt or alkali metal oxide to obtain a first-stage product; mixing the first-stage product or alkylphenol obtained by separating the first-stage product with the alkylation reagents, and carrying out second-stage reaction by taking solid acid modified by alkali metal salt or alkali metal oxide as a catalyst to obtain a second-stage product. Through the method, the phenolic materials are converted into the aromatic ethers, the heat value and oil-phase solubility of the tar and / or creosote oil can be effectively improved; the acidity and the corrosivity of the tar and / or the creosote oil can be reduced; the quality of the tar and / or the creosote oil is improved; the process is simple and efficient; the costs of raw materials are low; the operation cost is low; the industrial production is easy to implement; the raw materials used by the method are pollution-free; the treatment process is pollution-free; the method is an environment-friendly green process.

Description

Technical field [0001] The invention belongs to the field of tar treatment, and relates to a method for upgrading tar oil, in particular to a method for upgrading phenolic compounds in tar oil. Background technique [0002] Tar is a black or dark brown viscous liquid obtained during the dry distillation of coal or biomass. It has a special odor, is combustible and corrosive. It is a complex mixture of hydrocarbons with high aromaticity. Cheap fuel sources and precious chemical resources. However, tar, especially low-temperature pyrolysis tar, is rich in creosote components containing a large number of oxygen atoms, resulting in low calorific value and high acidity of tar, which limits its direct application as a liquid fuel, so it must be refined to reduce It is acidic and increases calorific value. [0003] At present, the main tar upgrading programs include component distillation separation technology for component separation, tar catalytic hydrogenation, and catalytic cracking...

AI Technical Summary

Problems solved by technology

However, due to the presence of more alkylphenols in addition to aromatic ethers in the resulting oil, the reduction in acidity of tar is limited, and the product also contains a certain amount of aromatics and chains in addition to aromatic ethers and alkylphenols. Hydrocarbons and other products increase the difficulty of the subsequent separation process