Production of Roadway Deicer from Agriculture and Marin Wastes by Wet Oxidation

主要结果如下：1批式研究I-乙酸的生产在较宽的条件下，如温度为300 ~ 400℃，反应时间为1 ~ 2 min，H_2O_2供给量为50 ~ 110%，对稻壳和稻草进行了部分湿式氧化实验，以获得高浓度的乙酸。结果表明，通过控制氧化条件可以得到较高的乙酸浓度，在300℃下乙酸收率最高，以TOC/TOC计为12%，2批式研究II-乙酸钙/镁的生产通过稻壳/稻草的湿法氧化产生的乙酸可以容易地转化为钙/镁。醋酸镁与牡蛎壳/工业镁废料混合。乙酸向乙酸钙/镁的转化效率在10分钟内达到>99%。3分批研究III-乙酸产率的提高一种新的两步反应方法，其中第一步反应是将通过水合由多糖产生的单糖脱水，以形成5-羟甲基糠醛（5 HMF）和2-糠醛（2FA），第二步反应是将5-HMF和2-FA氧化为乙酸。通过两步反应工艺获得的乙酸产率是通过通常的湿式氧化（在批式研究II中使用的方法）获得的乙酸产率的两倍。4连续流研究建立并调整连续流生产系统，并且其已经在稳定状态下操作足够长的时间。得到了生产高收率醋酸的操作条件。在该条件下获得的乙酸产率与批研究II中的乙酸产率几乎相同。

Significant results are summarized below :1 Batch study I-production of acetic acidPartial wet oxidation experiments of rice hulls and straw were performed over a wide range of conditions such as temperature varying from 300 to 400℃, reaction time from 1 to 2 min and H_20_2 supply from 50 to 110%, to obtain a high concentration acetic acid. Results show that a high acetic acid concentration can be obtained by controlling oxidation conditions, and the highest acetic acid yield, 12% on TOC/TOC basis, was obtained under the condition of 300℃, 1 min and H_20_2 supply of 70%.2 Batch study II-production of calcium/magnesium acetateAcetic acid produced by the wet oxidation of rice hulls/ straw can be easily converted to calcium/magnesium acetate by mixing with oyster shells/industrial Mg wastes. The conversion efficiency of acetic acid to calcium/magnesium acetate achieved >99% within 10 minutes.3 Batch study III-promotion of acetic acid yieldA new two-step reaction process, with the first step reaction for dehydration of monosaccharides, produced from polysaccharides by hydration, to form 5-hydroxymethyl furfural (5HMF) and 2-furaldehyde (2FA), and with the second step reaction for oxidizing 5HMF and 2FA to acetic acid, was developed. Acetic acid yield obtained by the two-step reaction process is twice higher than that by a usual wet oxidation (the method used in batch study II).4 Continuous-flow studyThe continuous-flow production system was set up and adjusted, and it has been operated at a stable state for a sufficiently long time. Operating condition for producing high acetic acid yield was obtained. Acetic acid yield obtained under the condition is almost the same as that in the batch study II.