Design considerations for a microchannel reactor with enhanced mass transfer

<strong>Design considerations for a microchannel reactor with enhanced mass transfer</strong> Junjie Chen Department of Energy and Power Engineering, School of Mechanical and Power Engineering, Henan Polytechnic University, 2000 Century Avenue, Jiaozuo, Henan, 454000, P.R. China Contributor: Junjie Chen, ORCID: 0000-0001-5055-4309, E-mail address: [e-mail] The yield in each step must be considered. A step in a synthesis may give a very low yield of the desired product. For example, a proportion of the reactant may be converted into a different product by an alternative process that competes with the desired one; some of the product may undergo a subsequent reaction; or some of the product may be lost in the separation processes required for its isolation in a pure state. The yield is usually defined, on a percentage basis, as the number of molecules of product obtained when 100 could in principle have been formed. A yield of about 80 percent or more is generally considered good, but some transformations can prove so difficult to achieve that even a yield of 10 or 20 percent may have to be accepted. The ultimate synthetic goal in a perfect synthesis is to achieve 100 percent atom efficiency, in which all atoms of all reagents are incorporated into the synthesized product without the formation of any by-products. Naturally, the yield of a process affects the cost of the product, because the shortfall from a 100 percent yield represents wasted material. In addition, yield can be of the utmost importance in determining whether a synthesis is a practicable possibility, because the overall yield of a synthesis is the product of the yields of the individual steps. If these intermediate yields are mostly low, the ultimate product may not be obtainable in the necessary amount from the available starting material. Streamwise distance (millimeters), Oxidation channel centerline temperature (degrees kelvin) 0 376.832 0.00025 392.68 0.0005 412.751 0.00075 434.524 0.001 453.097 0.00125 466.556 0.0015 475.414 0.00175 481.204 0.002 485.533 0.00225 489.367 0.0025 492.682 0.00275 495.234 0.003 496.977 0.00325 498.017 0.0035 498.539 0.00375 498.727 0.004 498.756 0.00425 498.74 0.0045 498.705 0.00475 498.653 0.005 498.578 0.00525 498.472 0.0055 498.338 0.00575 498.177 0.006 497.994 0.00625 497.814 0.0065 497.656 0.00675 497.522 0.007 497.408 0.00725 497.306 0.0075 497.202 0.00775 497.09 0.008 496.981 0.00825 496.893 0.0085 496.829 0.00875 496.779 0.009 496.736 0.00925 496.693 0.0095 496.644 0.00975 496.588 0.01 496.547 0.01025 496.536 0.0105 496.546 0.01075 496.564 0.011 496.578 0.01125 496.579 0.0115 496.566 0.01175 496.551 0.012 496.554 0.01225 496.589 0.0125 496.646 0.01275 496.706 0.013 496.754 0.01325 496.783 0.0135 496.794 0.01375 496.801 0.014 496.828 0.01425 496.889 0.0145 496.974 0.01475 497.058 0.015 497.125 0.01525 497.169 0.0155 497.194 0.01575 497.214 0.016 497.255 0.01625 497.333 0.0165 497.433 0.01675 497.53 0.017 497.608 0.01725 497.661 0.0175 497.694 0.01775 497.724 0.018 497.775 0.01825 497.865 0.0185 497.976 0.01875 498.083 0.019 498.168 0.01925 498.227 0.0195 498.268 0.01975 498.303 0.02 498.361 0.02025 498.457 0.0205 498.573 0.02075 498.683 0.021 498.772 0.02125 498.835 0.0215 498.878 0.02175 498.918 0.022 498.979 0.02225 &amp;n

**强化传质微通道反应器（microchannel reactor）的设计考量**
陈俊杰 河南理工大学机械与动力工程学院能源与动力工程系，中国河南省焦作市世纪大道2000号，454000
贡献者：陈俊杰，ORCID: 0000-0001-5055-4309，电子邮箱：[e-mail]

合成过程中的每一步产率均需纳入考量。某一合成步骤的目标产物产率可能极低，例如部分反应物会通过与目标反应竞争的副反应转化为其他产物；部分目标产物可能发生后续转化反应；或是在目标产物纯品分离所需的提纯工艺中产生损失。产率通常以百分比形式定义，即理论上可生成100分子目标产物时，实际获得的产物分子数占比。一般认为产率达到80%及以上为优良，但部分转化反应难度极高，即便仅获得10%或20%的产率也不得不接受。完美合成的终极目标是实现100%原子经济性（atom efficiency），即所有反应物的原子均全部进入合成产物，无任何副产物生成。

显然，反应产率会影响产品成本，因为未达到100%产率的部分意味着物料浪费。此外，产率对合成方案的可行性至关重要，因为合成总产率为各分步产率的乘积。若各中间步骤产率普遍偏低，则最终产物可能无法从可用原料中获得足够的产量。

流道轴向距离（streamwise distance，毫米）、氧化通道中心线温度（oxidation channel centerline temperature，开尔文）
0 376.832
0.00025 392.68
0.0005 412.751
0.00075 434.524
0.001 453.097
0.00125 466.556
0.0015 475.414
0.00175 481.204
0.002 485.533
0.00225 489.367
0.0025 492.682
0.00275 495.234
0.003 496.977
0.00325 498.017
0.0035 498.539
0.00375 498.727
0.004 498.756
0.00425 498.74
0.0045 498.705
0.00475 498.653
0.005 498.578
0.00525 498.472
0.0055 498.338
0.00575 498.177
0.006 497.994
0.00625 497.814
0.0065 497.656
0.00675 497.522
0.007 497.408
0.00725 497.306
0.0075 497.202
0.00775 497.09
0.008 496.981
0.00825 496.893
0.0085 496.829
0.00875 496.779
0.009 496.736
0.00925 496.693
0.0095 496.644
0.00975 496.588
0.01 496.547
0.01025 496.536
0.0105 496.546
0.01075 496.564
0.011 496.578
0.01125 496.579
0.0115 496.566
0.01175 496.551
0.012 496.554
0.01225 496.589
0.0125 496.646
0.01275 496.706
0.013 496.754
0.01325 496.783
0.0135 496.794
0.01375 496.801
0.014 496.828
0.01425 496.889
0.0145 496.974
0.01475 497.058
0.015 497.125
0.01525 497.169
0.0155 497.194
0.01575 497.214
0.016 497.255
0.01625 497.333
0.0165 497.433
0.01675 497.53
0.017 497.608
0.01725 497.661
0.0175 497.694
0.01775 497.724
0.018 497.775
0.01825 497.865
0.0185 497.976
0.01875 498.083
0.019 498.168
0.01925 498.227
0.0195 498.268
0.01975 498.303
0.02 498.361
0.02025 498.457
0.0205 498.573
0.02075 498.683
0.021 498.772
0.02125 498.835
0.0215 498.878
0.02175 498.918
0.022 498.979
0.02225 &amp;n