Process conditions for preparing methanol from cornstalk gas

• Published in: Journal of environmental sciences (China) Vol. 19; no. 5; pp. 628 - 632
• Main Authors: ZHU, Ling-feng, DU, Lei, LI, Xin-bao, LI, Guo-ting, ZHANG, Jie
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 2007
• Subjects: Biomass; Carbon dioxide; Catalysis; catalyst; Catalysts; Conservation of Natural Resources; cornstalk syngas; Desulfurization; Energy recovery; Energy-Generating Resources; fuel gas; Gases - analysis; methanol; Methanol - chemistry; Particle size; Plant Stems; Pressure; purification; Q1; synthesis; Tar; Temperature; Zea mays; 低热值燃料气; 催化合成; 工艺条件; 玉米杆合成气; synthesis; methanol; fuel gas; catalyst; cornstalk syngas; purification
• ISSN: 1001-0742; 1878-7320
• DOI: 10.1016/S1001-0742(07)60104-1

The low-heat-value cornstalk gas produced in the down-flow fixed bed gasifier was tentatively used for methanol synthesis. The cornstalk gas was purified and the technical procedures such as deoxygenation, desulfurization, catalytic cracking of tar, purification and hydrogenation were studied. The catalytic experiments of methanol synthesis with cornstalk syngas were carried out in a tubular-flow integral and isothermal reactor. The effect of reaction temperature, pressure, catalysttypes, catalyst particle size, syngas flow at entering end and composition of syngas was investigated. The optimum process conditions and yield of methanol from cornstalk syngas were obtained. The experimental results indicated that the proper catalyst of the synthetic reaction was C301 and the optimum catalyst size （φ） was 0.833 mm×0.351 mm. The optimum operating temperature and pressure were found to be 235℃ and 5 Mpa, respectively. The suitable syngas flow 0.9-1.10 mol/h at entering end was selected and the best composition of syngas were CO 10.49%, CO2 8.8%, N2 37.32%, CnHm 0.95% and H2 40.49%. The best methanol yield is 0.418 g/g cornstalk. The study provided the technical support for the industrial test of methanol production from biomass （cornstalk）gas.