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在固定床反应器上考察了反应温度、反应压力、乙酸(HAC)液体进料空速、H_2/HAC(总气体空速GHSV或H_2流量)对乙酸选择性加氢制乙醇反应的影响,研究了乙酸转化率、产物选择性、乙醇时空收率的变化规律,验证了自主开发催化剂的稳定性。结果表明,副产物的选择性受反应条件的影响,选择合适的反应条件可以抑制乙酸乙酯和丙酮的生成。原料与催化剂床层接触时间小于5s时,可以避免发生乙酸加氢分解脱羰反应生成甲烷气相产物,也避免了乙醇的进一步反应生成乙烷。在反应温度为280℃,反应压力为2.5 MPa,乙酸进料液时空速为0.72 h~(-1),H_2/HAC(mol ratio)为16的条件下,乙酸乙酯选择性为6%。900 h长周期实验表明,自主开发催化剂具有较好的工业应用前景。
The effect of reaction temperature, reaction pressure, liquid feed space velocity of HAC liquid, H 2 / HAC (total gas airspeed GHSV or H 2 flow rate) on the selective hydrogenation of acetic acid to ethanol was investigated in a fixed bed reactor. The conversion of acetic acid, selectivity of product and the change of space time yield of ethanol proved the stability of self-developed catalyst. The results showed that the selectivity of by-products was affected by the reaction conditions, and the suitable reaction conditions could inhibit the formation of ethyl acetate and acetone. When the contact time between the raw material and the catalyst bed is less than 5s, the acetic acid hydrolization decomposition and decarbonylation reaction can be avoided to produce the methane gas phase product, and the further reaction of ethanol can be avoided to generate ethane. The selectivity of ethyl acetate was 6% at a reaction temperature of 280 ℃, a reaction pressure of 2.5 MPa, a space velocity of 0.72 h -1 in acetic acid feed solution and a H 2 / HAC (mol ratio) of 16. 900 h long-term experiments show that self-developed catalyst has good industrial application prospects.