路线二：此工艺路线工艺路线相对复杂，所使用原材料较多，酰氯化和氯化都属

Route II: This route is relatively complex routing process, use more raw materials, acid chlorides and chloride processes are classified as dangerous, difficult operation, the presence of 3 to 5% of the product of isomer 4, to give less than 0.5% the following 2-bit product, recrystallized needed again. Advantages of wastewater is relatively small, however, sulfur dioxide wastewater treatment still has some difficulties

Route 2: This route route is relatively complex, the use of more raw materials, cryptochlorination and chlorination are dangerous processes, the operation is more difficult, the product exists 3 to 5% of the 4-bit isomer, to get less than 0.5% of the 2-bit products, need to re-crystallize treatment. The advantage is that the wastewater is relatively small, but sulfur dioxide wastewater treatment is still difficult

Route 2: this process is relatively complex and uses a lot of raw materials. Acyl chlorination and chlorination are dangerous processes, which are difficult to operate. There are 3-5% 4-isomers in the product. To get 2-isomers less than 0.5%, recrystallization is needed. The advantage is that the wastewater is relatively small, but the treatment of sulfur dioxide wastewater is still difficult