Composition of phenolic compounds in wastewater from the fixed-bed gasification of Baishihu coal

Crude phenols extracted using organic solvent from the wastewater of a typical fixed-bed gasification process was used as a raw material, and the distillation range was analyzed. The wide and narrow fractions of the raw material derived from distillation range analysis were cut using a real boiling point distillation device. The phenolic compounds in the different fractions were then qualitatively and quantitatively analyzed by gas chromatography after derivatization pretreatment. The yield of the < 290 °C fraction was 68.50% (mass fraction). A total of 33 effective phenolic compounds were identified in this fraction, and the percentage of identified phenols was nearly 80%. The contents of eight phenolic compounds were high, with phenol being the most abundant (26.34%) followed by catechol (13.44%). The contents of the remaining six abundant phenols ranged from 4% to 8%. The sum of the contents of m-cresol and p-cresol exceeded 12%, and the content of 5-indenol was nearly 8%. The yield of the fraction rich in low-grade phenols (< 230 °C) was 35.40%. The content of phenol in this fraction was more than 40%, the total content of cresol was over 23%, and the total content of m-cresol and p-cresol was nearly 20%. At room temperature, the 235–245 °C and 245–260 °C fractions were white crystals in which the catechol content was approximately 50%, and the 5-indenol content was more than 10%. The contents of these two high-value-added phenolic compounds are low in typical coal tar, making them difficult to extract. However, due to their strong polarity and good water solubility, catechol and 5-indenol are enriched in gasification wastewater by water selection, allowing their further extraction.

Composition of phenolic compounds in gasification wastewater

The crude phenol was used as raw material, which was extracted by organic solvent from wastewater of typical fixed bed gasification process. The distillation range of raw materials was analyzed. According to the results of distillation range analysis, the wide and narrow fractions of raw materials were cut by using real boiling point distillation device. The method of derivatization pretreatment combined with gas chromatography external standard was used for qualitative and quantitative analysis of phenolic compounds in different fractions. The results showed that the yield of the fraction below 290 ℃ was 68.50% (mass fraction), in which 33 kinds of effective phenolic compounds could be identified, and the total amount of identified phenols was nearly 80%. The content of eight phenolic compounds was relatively high, among which the content of phenol was the highest (26.34%) , followed by catechol 13.44%. Among these phenolic compounds, the content of the remaining six phenols ranged from 4 to 8%, the total content of m-cresol and p-cresol was more than 12%, and the content of 5-indenol was nearly 8%. The yield of the fraction rich in low-grade phenol below 230 ℃ was 35.40%, in which the content of phenol was more than 40%, the total content of cresol was more than 23%, and the total content of m-cresol and p-cresol was nearly 20%. At room temperature, the fractions of 235 ~ 245 ℃ and 245 ~ 260 ℃ were white crystals, in which catechol content was about 50%, and 5-indenol content was more than 10%. The content of these two phenolic compounds with high added value was low in typical coal tar, so it was difficult to extract them. However, they could be enriched in gasification wastewater by water selection due to their strong polarity and good water solubility, which made it possible for them to be further extracted.

Ethanol and Diesel Fuel Mix the Preparation and Physical and Chemical Properties of Research

To ethanol fuel engine performance and the physical and chemical properties were introduced, and the mixed fuel ethanol diesel phase solublecharacteristic test, hybrid fuel mixture fuel of cold, mixed fuel filter point of viscosity and lubricity, mixed fuel distillation range and hybrid hexadecane value, hybrid density and calorific value and mixed fuel phase separation and stability analysis of numerical calculation.