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The effect of alkali on the product distribution from black liquor conversion under supercritical water.

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      Abstract

      Lignin in chemical pulping waste, or black liquor (BL), can be converted into various products via supercritical water gasification (SCWG). However, the inherited alkaline contents from the pulping chemicals may affect the product yields and properties. In this research, the influence of the residual alkali on the product distribution via SCWG of soda BL and kraft BL was evaluated. The SCWG was performed in a batch quartz reactor for 10 min at various temperatures (673, 773 and 873 K) and pressures (250, 300 and 400 bar). The highest hydrogen (H2) production occurred at 873 K for the soda BL. The water-gas shift reaction with sodium ions played an important part in the H2 production, while only small amounts of methane and carbon monoxide were detected. Hydrocarbons, carboxylic acids and esters were the dominant substrates in the liquid products, which denoted the potential of this method for bond cleaving of the lignin macromolecule. As a result, BL, which typically contains alkali salt, was an appropriate feedstock for the SCWG reaction to produce renewable fuel. This method not only has a positive influence on the generation of value added products from highly corrosive waste but also helps avoid some technical problems commonly encountered with direct firing in a recovery boiler.

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      Affiliations
      [1 ] a International Program in Hazardous Substance and Environmental Management, Graduate School , Chulalongkorn University , Bangkok , Thailand.
      [2 ] b National Metal and Material Technology Center , Thailand Science Park, Pathumthani , Thailand.
      [3 ] c Department of Environmental Engineering, Faculty of Engineering , Chulalongkorn University , Bangkok , Thailand.
      [4 ] d Energy Research Institute , Chulalongkorn University , Bangkok , Thailand.
      Journal
      Environ Technol
      Environmental technology
      Informa UK Limited
      0959-3330
      0959-3330
      May 11 2017
      28443361
      10.1080/09593330.2017.1323954

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