Technology Overview

This chapter focuses on the production of biomethanol through biomass gasification. The technology consists of two main steps: converting solid biomass into bio-syngas and subsequently converting the syngas into methanol. Gasification occurs at high temperatures (>700°C) with a controlled supply of oxygen and/or steam, producing syngas composed of carbon monoxide, hydrogen, and carbon dioxide.

Technical Characteristics

Gasification reactor designs vary, including updraft, downdraft, and cross-flow configurations, and may use either external heat sources or direct combustion agents. Commercial plants are typically large-scale, although smaller-scale plants also exist in regions without significant natural gas resources.

Comparisons between gasification technologies indicate that plants integrated with solid oxide electrolyzer cells (SOEC) can achieve higher efficiency, with methanol yield per unit of feedstock approximately 8% higher than conventional plants. However, no verified data are available on capital and operating costs; existing estimates depend on feedstock prices and conversion efficiency.

Application in Vietnam

Currently, no commercial plants using this technology exist in Vietnam. Several international projects have been implemented or are under development, such as Trans World Energy (USA) with a capacity of 875,000 tons/year, and Enerkem (Netherlands) with a capacity of 215,000 tons/year. These projects demonstrate the potential of biomass gasification for biomethanol production, although significant economic and technical challenges remain.