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The Study of Synthesis Technology of P-Hydroxybenzaldehyde from P-Nitrotoluene

Jiang Qin,Chen Dongchu,Zhou Hu(School of Chemistry and Chemical Engineering,Hunan university of science and technology,Xiangtan,Hunan 411201)  
P-hydroxybenzaldehyde was synthesized from p-nitrotoluene by redox reaction,diazotization reaction and hydrolysis reaction.The reaction condition was optimized by changing the technological parameters such as mole ratio of raw materials and reaction time.Polymer was easy to produce when p-nitrotoluene was redoxed to p-aminotenzaldehyde and after-treatment of p-aminotenzaldehyde.Experiment was arranged to find out the best technology conditions to reduce or eliminate the polymer.Experimental results showed that the polymer was reduced greatly under the following reaction conditions: sulfur index 5,the proportion of ethanol and water is greater than 1,reaction time 3 h,the quick speed during after-treatment and so on.That the yield of p-hydroxybenzaldehyde was improved under the following reaction conditions: mole ratio of H2SO4 and p-aminotenzaldehyde 2.2~2.4:1,acidification time 0.5 h,diazotization time 1~1.5 h.
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