Benzene → Dimethyl Phthalate

HRID 720799

反応式

HRID 720799 の反応式
[C:1]1(=[O:11])[O:6][C:4](=[O:5])[C:3]2=[CH:7][CH:8]=[CH:9][CH:10]=[C:2]12.S(=O)(=O)(O)O.Cl.S([O:23][CH3:24])(OC)(=O)=O.[CH:25]1C=CC=CC=1>CO>[C:4]([O:23][CH3:24])(=[O:5])[C:3]1[C:2](=[CH:10][CH:9]=[CH:8][CH:7]=1)[C:1]([O:6][CH3:25])=[O:11]

参加物

7

反応物 5

HCID 241BenzeneHCID 313Hydrochloric AcidHCID 1118Sulfuric AcidHCID 6497Dimethyl SulfateHCID 6811Phthalic Anhydride2 回

生成物 1

HCID 8554Dimethyl Phthalate

試薬・触媒・溶媒 1

HCID 887Methanol溶媒

実験手順

The present invention provides a method of producing dimethyl phthalate from naphthalene based chemicals, particularly, phthalic anhydride, which is a coal tar by product, by treating phthalic anhydride with methanol, adding a catalyst, such as sulphuric acid, hydrochloric acid or mixture thereof and a promoter, such as, dimethyl sulphate. Refluxing the resultant mixture at a temperature in the range of 60 to 100 degree Celsius, for a time period in the range of 6 to 12 hours, in presence of benzene. Separating the distillate into two layers. Removing the aqueous layer and sending back the benzene layer to the reaction vessel. Recovering unreacted methanol by distillation. Neutralizing the residue with caustic soda followed by extraction with benzene. Distilling the extract under vacuum to obtain benzene, and continuing the distillation process at a temperature in the range of 145 to 146 degree Celsius under 10 mm of mercury to obtain dimethyl phthalate.

後処理

  1. additionadding a catalyst
  2. customin the range of 6 to 12 hours
  3. customSeparating the distillate into two layers
  4. customRemoving the aqueous layer
  5. customRecovering unreacted methanol
  6. distillationby distillation
  7. extractionNeutralizing the residue with caustic soda followed by extraction with benzene
  8. distillationDistilling the
  9. extractionextract under vacuum
  10. customto obtain benzene
  11. customin the range of 145 to 146 degree Celsius

出典と根拠

ORDレコード
ord-4726c9d1a6fb48e39dcf833c92f046fa
出典データセット
uspto-grants-2006_11
特許番号
US07135588B2

関連ノート

読み込み中…