2 - Heptanone Synthesis Of New Processes And Phthalic Anhydride Polyester Polyol Synthesis And Modification

The thesis includes two parts: one is a new synthesis method of 2-heptanone, the other is the preparation and modification research of benzolic acid anhydride polyester polyols.1. A New Synthesis Method of 2-Heptanone2-Heptanone (MAK) has been authorized to use in food and daily flavor in US, Europe and other countries. It has also been widely used as industrial solvent, textile fiber, medicine, agricultural chemicals, spices etc.There are lots of works has been reported about 2-heptanone. But the most routes are more complex with somewhat lower yield.This work introduces a new synthesis method of 2-heptanone using acetone and butyraldehyde as the raw materials. 2-Heptanone could be obtained by the reaction of hydroxy aldehyde condensation, dehydration and catalytic hydrogenation. In the reaction, cyclohexane was used as the resolver and ZnCl₂ as the assistant.The 2-ethyl-2-hexenoicaldehydes and 2-ethylhexyl aldehyde as by-product could also be need in the market, the former may take the essence spice, the latter could be oxidized to 2-ethyl hexanoic acid, which is the green environmental protection resolver of upscale coating and the upscale printing ink.Main innovations of this work:1) The cyclohexane plays a very important role which contains the resolver dilution, extraction of the transfer agent, and raises reaction rate and raw material conversion rate.2) This route enables the conversion rate of butyraldehyde to 100% nearly with the reuse of the excessive acetone and cyclohexane.2. The Synthesis and Modified Research of Benzolic Acid Anhydride Polyester PolyolsThe benzene ring structure in the benzolic acid anhydride polyester polyols has entrusted polyurethane froth many fine performance, such as toughness, the flame retardance, cohesiveness, bear etc.The fine performances of benzolic acid anhydride polyester polyols causes it widely to apply in the electrical appliances, the automobile, the petroleum chemical industry, the building material, the furniture profession. It is used in the refrigerator guaranteeing cold, the disinfection cabinet, the cold storage, the refrigeration truck, the piping insulation to guarantee cold, the building board, imitate wooden domains, adhesive, shoe sole original fluid, plastic track, spray coating material, and so on.This work uses benzolic acid anhydride, 2,2'-oxydiethanol, glycerol as the base stock, and uses polyanhydride, the polyester bottles, the rosin ester, the dicarboxylic acid of technical grade to carry on the modification to prepare aromatic polyester polyols with different acid value and hydroxyl value in one-stage process.Main innovations of this work:1) It is the first time to prepare aromatic polyester polyols with fine performance by taking polyanhydride residue as the sour component.2) Combined with the practical production, a reasonable pilot programme of benzolic acid anhydride polyester polyols was designed and successfully applied into industrialized production.