Synthesis process for o-chlorobenzaldehyde
A technology of o-chlorobenzaldehyde and synthesis process, which is applied in the directions of hydrolysis to prepare carbonyl compounds, organic chemistry, halogenated hydrocarbon preparation, etc. The generation of products, the improvement of product quality, the effect of improving quality
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Embodiment 1
[0019] Weigh 900g of o-chlorotoluene in a four-neck flask, stir under light, control the temperature at 100°C, feed chlorine gas, and react for 2 hours to obtain a chlorinated solution. The content of o-chlorobenzyl chloride in the chlorinated solution is 36.13%, and Benzyl chloride is 62.30%, o-chlorotrichlorobenzyl is 1.11%, and the chlorination product on the benzene ring is 0.36%. The above-mentioned chlorinated solution is heated to boiling under reduced pressure, and o-chlorobenzyl chloride is separated. When the content of o-chlorobenzyl chloride is lower than 1%, the heating is stopped, and the remaining mixed solution is reserved for hydrolysis reaction. Add the above residual liquid into the hydrolysis flask, control the temperature to 110°C, add the aqueous solution of catalyst ferric chloride and aluminum chloride under stirring, wherein the amount of catalyst is 0.015% of the mass of the mixed liquid, react for 2.5h, and hydrogen chloride gas is emitted at the begi...
Embodiment 2
[0021] Weigh 900g of o-chlorotoluene in a four-neck flask, stir under light, control the temperature at 110°C, feed chlorine gas, and react for 1.5h to obtain a chlorinated solution. The content of o-chlorobenzyl chloride in the chlorinated solution is 38.3%. Dichlorobenzyl 60.6%, o-chlorotrichlorobenzyl 1.1%. The above-mentioned chlorinated solution is heated to boiling under reduced pressure, and o-chlorobenzyl chloride is separated. When the content of o-chlorobenzyl chloride is lower than 1%, the heating is stopped, and the remaining mixed solution is reserved for hydrolysis reaction. Add the above residual liquid into the hydrolysis flask, control the temperature to 120°C, add the aqueous solution of catalyst ferric chloride and aluminum chloride under stirring, wherein the amount of the catalyst is 0.02% of the mass of the mixed liquid, react for 2 hours, and hydrogen chloride gas is emitted at the beginning of the reaction. Pass into water to obtain hydrochloric acid, t...
Embodiment 3
[0023] Weigh 900g of o-chlorotoluene in a four-neck flask, stir under light, control the temperature at 120°C, feed chlorine gas, and react for 100 minutes to obtain a chlorinated solution. The content of o-chlorobenzyl chloride in the chlorinated solution is 39.2%. Benzyl chloride is 58.7%, and o-chlorotrichlorobenzyl is 2.1%. The above-mentioned chlorinated solution is heated to boiling under reduced pressure, and o-chlorobenzyl chloride is separated. When the content of o-chlorobenzyl chloride is lower than 1%, the heating is stopped, and the remaining mixed solution is reserved for hydrolysis reaction, and o-chlorobenzyl chloride It is reused as a raw material, and the chlorination reaction of the previous step is carried out again to generate o-chlorodichlorobenzyl. Add the above residual liquid into the hydrolysis flask, control the temperature to 100°C, add the aqueous solution of catalyst ferric chloride and aluminum chloride under stirring, wherein the amount of the c...
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