原料组成对醋酸加氢制乙醇反应的影响

Effects of feed composition on reaction of acetic acid hydrogenation to ethanol

在固定床微反装置上考察了原料中水、乙酸乙酯和乙醛质量分数对醋酸加氢制乙醇反应性能的影响。反应在温度为285℃、压力为2.5MPa、酯酸空速为0.8mL/(mL·h)和氢酸摩尔比为16的条件下进行。结果表明,随着水质量分数从0增加到10.0%,醋酸转化率下降了4.99%,乙醇选择性变化不大。乙酸乙酯质量分数从0增加到10.0%,醋酸转化率下降了3.93%,乙醇选择性增加了9.10%;在乙酸乙酯质量分数为4.4%时反应前后乙酸乙酯的量保持不变。乙醛质量分数从0增加到2.0%,醋酸转化率下降了2.02%,乙醇选择性提高1.31%后变化不大;在乙醛质量分数为0.4%时反应前、后乙醛的量不变。总体而言,醋酸转化率随水、乙酸乙酯和乙醛质量分数的增加而降低;乙醇选择性随乙酸乙酯和乙醛质量分数的增加而升高,水质量分数对选择性影响很小。

The effects of the mass content of water,ethyl acetate and acetaldehyde on the performance of acetic acid hydrogenation to ethanol were studied in a fixed bed microreactor.Experiments were carried out at 285℃,2.5 MPa,0.8 mL/(mL·h)of acetic acid hourly space velocity(SV),16 of mole ratio of hydrogen to acetic acid(H/AC).The results show that the acetic acid conversion decreases 4.99%with the increase of water content from 0 to 10.0%,while the selectivity of ethanol shows little change.The acetic acid conversion decreases 3.93%with the increase of ethyl acetate content from 0 to 10.0%,while the ethanol selectivity increases 9.10%.When the ethyl acetate content is 4.4%,the amount of ethyl acetate remains unchanged after reaction.The acetic acid conversion decreases 2.02%with the increase of acetaldehyde content from 0 to 2.0%,while the ethanol selectivity increases 1.31%and then shows little change.When the acetaldehyde content is 0.4%,the amount of acetaldehyde remains unchanged after reaction.Generally,the acetic acid conversion decreases with increasing the content of water,ethyl acetate and acetaldehyde.Furthermore,the selectivity of ethanol increases with increasing the content of ethyl acetate and acetaldehyde,and remains stable with the increase of water content.