Font Size: a A A

Synthesis Of Poly (1,2-cyclohexanediol Adipicate)

Posted on:2006-02-27Degree:MasterType:Thesis
Country:ChinaCandidate:L M SunFull Text:PDF
GTID:2121360155469106Subject:Chemical processes
Abstract/Summary:PDF Full Text Request
1, 2-cyclohexanediol is a kind of important organic synthesis raw materials, mainly used for making such fine chemical products as the polyester, medicine, agriculture chemical ,etc. With the development of technology of petrochemical industry, its production cost is lower and lower, the output increases greatly, so the synthesis and application of its derivative are paid close attention to people. In this text ,we mainly research the synthesis of poly(1, 2-cyclohexanedioladipicate) which is one of the derivatives of 1, 2-cyclohexanediol.At first, the synthesis of poly(1, 2-cyclohexanediol adipicate) was test in advance ,and investigate various kinds of factors that reflects the synthesis in the experiment and screen better catalyst that is suitable for the synthetic system.We adopt the method of water-washed-precipitate to separate the produce, and investigate the temperature of water of the precipitator, the proportion and dosage of the solvent of ethanol and water of precipitator while washing in the separation process.In the experiment, while adding water and precipitating after the produce is dissolved with the ethanol , we find the dissolved liquid appears white milk form when water temperature lower than 30℃, under this kind of situation, the produce was emulsifiated and can not sublimate, with the temperature rising ,the above-mentioned phenomena can be alleviated. Through many experiments ,find when the proportion of the solvent of ethanol and precipitator of water is 1:1. 5 and the temperature of water is about 50 ℃, the result is better after water-washing four times.Acid value and hydroxyl value are two pieces of characteristic value of the purpose products and the experiment adopts the titrimetric law of acid and alkali to confirm them. In the experiment, we find the disposition of the lye exerts a great influence on survey of acid value and hydroxyl value.When dispose the potassium hydroxide lye with water, find the solution will present the white muddily when dripping and the titrimetric terminal point is difficult to judge,while use the ethanol instead the titrimetric terminal point is obviously clear and no muddy phenomenon isappeared.We also screen the solvent which dissolved the produce in the experiment. The commonly used solvent is toluene- methyl alcohol,benzene- ethanol and toluene-ethanol. Find the performance of dissolving of the produce in three kinds of solvents is roughly the same,and has little power to the titrimetric result in the experiment. Considering the toxicity, labour protection and cost of the solvent ,etc. Finally.we select the toluene- ethanol as the solvent of the experiment. In the course of analysis of hydroxyl value at the same time, we also investigate the hydrolysised and acyl time and draw better conclusionOn the basis of testing in advance,utilize the method of the single factor to optimize the important influence factor reacting in the course one by one, for instance: the matching of acid and diol, react temperature ,the way of temperature rising, react time , the dosage of catalyst and stabilizer, and receive the better process conditions .We also has carried on the repeated experiment three times on this basis, and the reproducing of the experiment is good.We still use infrared spectrum to identify the synthesized produce and compare it with the standard infrared spectrum and find they accord well. Finally,we synthesize the poly(1, 2-cyclohexanediol adipicate)which is a yellowish,translucent and viscid liquid.Tts acid value <9.3mg/g. hydroxyl value between 50-70mg/g and molecular weight between 1000-2000...
Keywords/Search Tags:Trans-1,2-cyclohexanediol, Poly(1, 2-cyclohexanedioladipicate), Adipic acid, Synthesis, Polyester polyol
PDF Full Text Request
Related items