The invention relates to a low-temperature
isomerization method for low-carbon normal alkanes, wherein the low-temperature
isomerization method includes the following steps: (1) carrying out heat exchange of a light
hydrocarbon raw material containing normal C5 and normal C6 as principal components with an
isomerization product, and after heat exchange, rectifying to obtain heterogeneous C5, normal C5 and a heavy
hydrocarbon; (2) rectifying the heavy
hydrocarbon again, to obtain heterogeneous C6 and a heavy hydrocarbon, mixing the normal C5 with the heavy hydrocarbon, and then supplementing
chlorine; (3) carrying out
drying dehydration on the material obtained after
chlorine supplement, mixing with dried fresh
hydrogen and circulating
hydrogen, heating, and carrying out an isomerization reaction under the action of a catalyst after heating; and (4) after carrying out heat exchange of the isomerization product with a fresh
raw material, carrying out first gas-liquid separation, wherein the obtained non-condensable gas is circulating
hydrogen; and carrying out gas-liquid separation on the obtained liquid again, mixing the obtained liquid with a fresh
raw material, and then rectifying. The yield of the
liquid product obtained by the low-temperature isomerization method is more than 98%, the isomerization rate is 60%-90%, and the
octane value can be increased by 10-30.