Application and production of 3,3-Dimethylacrylic acid

Introduction

CAS 541-47-9 3,3-Dimethacrylic acid is widely used in medicines, pesticides, fragrances and surfactants. Spices are used in detergents to remove dandruff and relieve itching, non-toxic and non-irritating. 

And 3,3-dimethacrylic acid can be used as a pesticide and pharmaceutical intermediate to synthesize pyrethroid raw material by Martel method.

Production

CN201310605741.8 reported a method for preparing 2,2-dimethylvinylboronic acid, which is characterized in that: 

Using organic solvent dichloromethane or tetrahydrofuran, under the condition of 10~60°C, using 3,3-dimethylvinylboronic acid Acrylic acid, react with bromine for 3~4h, adjust the pH to 9~10 with alkali after the reaction, react for 2~3h under the condition of 30~60℃, leave standing for stratification after the reaction, and distill the organic layer to obtain 2,2-diol Methyl vinyl bromide. Using organic solvent tetrahydrofuran, at -78~-40℃ temperature, using 2,2-dimethylvinyl bromide, react for 2~3h under the action of metal lithium and boronating reagent, and use hydrochloric acid to adjust pH to 3~4 , extracted with ethyl acetate, concentrated the organic layer, filtered through a non-polar hydrocarbon solvent, and dried to obtain 2,2-dimethylvinylboronic acid. The invention has the characteristics of safety, environmental protection and easy operation, and is suitable for industrial production.

CN200910238568.6 reports a viscoelastic weak gel displacement adjusting agent, which is used in water injection operation of oil wells in oil fields. The weight parts of each component are: viscoelastic surface active polymer: 0.15-0.25 part; cross-linking agent: 0.05-0.15 part; regulator: 0.001-0.005 part; water: 99.8-99.6 part. 

For the viscoelastic surface active polymer, the parts by weight of each component are: acrylamide: 20-30 parts; 3,3-dimethacrylic acid: 1-2 parts; 2-acrylamido-2-dodecane Ethyl sulfonic acid: 1.5~3.5 parts and/or N,N-dimethyl-allyl-hexadecylammonium chloride: 1~4 parts; deionized water: 60~75 parts; initiator: 0.3 ~1 serving. For the initiator, the parts by weight of each component are: 2.5-3.5 parts of ammonium persulfate; 1 part of sodium sulfite. The effect is that it has a certain gel strength, and has the ability to reduce the oil-water interfacial tension, the gel formation time is adjustable, the water injection profile can be improved, the oil-water interfacial tension can be reduced, the residual oil in the pores can be washed away, and the water injection recovery rate can be improved.