丙二醇甲醚气固相催化合成甲氧基丙酮

以丙二醇甲醚为原料,利用共沉淀法制备的Cu-ZnO为催化剂,在固定床反应器中催化脱氢合成甲氧基丙酮.考察了催化剂制备工艺和反应条件对催化活性的影响,并对催化剂的稳定性进行了研究.结果表明,催化剂最佳制备条件是:铜锌物质的量比为0.5,沉淀温度为55℃,55℃老化1h,采用硝酸钠改性,400℃焙烧4h.催化剂最佳反应工艺:240℃下还原4h,反应温度为250℃,液空时速为40 mL/h,氮载气速度为150 mL/min.催化剂在120 h内稳定性良好.

Synthesis of Methoxyacetone from Propylene Glycol Monomethyl Ether by Gas-solid Catalytic Reaction

Methoxyacetone was synthesized from proprylene glycol monomethyl ether using co-precipitated copper-zinc oxide as catalyst in fixed-bed reactor.Optimal preparation of catalysts was studied and the best conditions for the targeted reaction were investigated.Results showed that the optimal parameters for Cu-ZnO catalysts are listed as followed:nCu ∶ nZn =0.5,precipitation temperature of 55 ℃,aging temperature of 55 ℃ for 1 h,being modified by sodium nitrate,and being annealed at 400 ℃ for 4 h.Meanwhile,the optimal condition for the reaction of converting proprylene glycol to methoxyacetone is obtained to be first reduced at 240 ℃ for 4 h,then going through reaction under 250 ℃.The liquid space velocity and flowing rate of nitrogen should be 40 mL/h and 150 mL/min,respectively.The as-made catalyst showed excellent stability in the time duration of 120 h.